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Schedule III - Real Estate and Accumulated Depreciation - Properties (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Real Estate Subject to Operating Leases        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 361,073,000      
Initial Cost to Company        
Land 2,436,311,000      
Buildings 9,311,273,000      
Cost Capitalized Subsequent to Acquisition 1,013,029,000      
Increase (Decrease) in Net Investments (710,717,000)      
Gross Amount at which Carried at Close of Period        
Land 2,248,300,000      
Buildings 9,801,596,000      
Total 12,049,896,000 $ 13,316,632,000 $ 11,677,185,000 $ 10,736,752,000
Accumulated Depreciation 1,509,730,000 1,672,091,000 1,448,020,000 1,206,912,000
Real Estate Subject to Operating Leases | Industrial facilities in Erlanger, KY        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 1,526,000      
Buildings 21,427,000      
Cost Capitalized Subsequent to Acquisition 2,966,000      
Increase (Decrease) in Net Investments (84,000)      
Gross Amount at which Carried at Close of Period        
Land 1,526,000      
Buildings 24,309,000      
Total 25,835,000      
Accumulated Depreciation $ 15,989,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in Thurmont, MD and Farmington, NY        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 729,000      
Buildings 5,903,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 729,000      
Buildings 5,903,000      
Total 6,632,000      
Accumulated Depreciation $ 3,814,000      
Life on which Depreciation in Latest Statement of  Income is Computed 15 years      
Real Estate Subject to Operating Leases | Warehouse facility in Commerce, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,905,000      
Buildings 11,898,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (3,043,000)      
Gross Amount at which Carried at Close of Period        
Land 4,573,000      
Buildings 9,187,000      
Total 13,760,000      
Accumulated Depreciation $ 6,279,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Goshen, IN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 239,000      
Buildings 940,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 239,000      
Buildings 940,000      
Total 1,179,000      
Accumulated Depreciation $ 650,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in Sylmar, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,052,000      
Buildings 5,322,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (1,889,000)      
Gross Amount at which Carried at Close of Period        
Land 1,494,000      
Buildings 3,991,000      
Total 5,485,000      
Accumulated Depreciation $ 2,603,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facilities in the United States        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 9,382,000      
Buildings 0      
Cost Capitalized Subsequent to Acquisition 238,000      
Increase (Decrease) in Net Investments 14,483,000      
Gross Amount at which Carried at Close of Period        
Land 9,025,000      
Buildings 15,078,000      
Total 24,103,000      
Accumulated Depreciation $ 11,286,000      
Life on which Depreciation in Latest Statement of  Income is Computed 15 years      
Real Estate Subject to Operating Leases | Land in Glendora, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,135,000      
Buildings 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 17,000      
Gross Amount at which Carried at Close of Period        
Land 1,152,000      
Buildings 0      
Total 1,152,000      
Accumulated Depreciation 0      
Real Estate Subject to Operating Leases | Warehouse facility in Doraville, GA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 3,288,000      
Buildings 9,864,000      
Cost Capitalized Subsequent to Acquisition 17,079,000      
Increase (Decrease) in Net Investments (11,410,000)      
Gross Amount at which Carried at Close of Period        
Land 3,288,000      
Buildings 15,533,000      
Total 18,821,000      
Accumulated Depreciation $ 3,308,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Corpus Christi, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,490,000      
Buildings 72,497,000      
Cost Capitalized Subsequent to Acquisition 3,513,000      
Increase (Decrease) in Net Investments (77,927,000)      
Gross Amount at which Carried at Close of Period        
Land 288,000      
Buildings 1,285,000      
Total 1,573,000      
Accumulated Depreciation $ 835,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Land in Irving and Houston, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 9,795,000      
Buildings 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 9,795,000      
Buildings 0      
Total 9,795,000      
Accumulated Depreciation 0      
Real Estate Subject to Operating Leases | Industrial facility in Chandler, AZ        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 5,035,000      
Buildings 18,957,000      
Cost Capitalized Subsequent to Acquisition 8,373,000      
Increase (Decrease) in Net Investments 516,000      
Gross Amount at which Carried at Close of Period        
Land 5,035,000      
Buildings 27,846,000      
Total 32,881,000      
Accumulated Depreciation $ 17,537,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Memphis, TN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,882,000      
Buildings 3,973,000      
Cost Capitalized Subsequent to Acquisition 294,000      
Increase (Decrease) in Net Investments (3,892,000)      
Gross Amount at which Carried at Close of Period        
Land 328,000      
Buildings 1,929,000      
Total 2,257,000      
Accumulated Depreciation $ 1,700,000      
Life on which Depreciation in Latest Statement of  Income is Computed 15 years      
Real Estate Subject to Operating Leases | Industrial facility in Romulus, MI        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 454,000      
Buildings 6,411,000      
Cost Capitalized Subsequent to Acquisition 525,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 454,000      
Buildings 6,936,000      
Total 7,390,000      
Accumulated Depreciation $ 3,461,000      
Life on which Depreciation in Latest Statement of  Income is Computed 10 years      
Real Estate Subject to Operating Leases | Retail facility in Bellevue, WA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,125,000      
Buildings 11,812,000      
Cost Capitalized Subsequent to Acquisition 393,000      
Increase (Decrease) in Net Investments (123,000)      
Gross Amount at which Carried at Close of Period        
Land 4,371,000      
Buildings 11,836,000      
Total 16,207,000      
Accumulated Depreciation $ 7,425,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Winston-Salem, NC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,860,000      
Buildings 12,539,000      
Cost Capitalized Subsequent to Acquisition 3,075,000      
Increase (Decrease) in Net Investments (7,325,000)      
Gross Amount at which Carried at Close of Period        
Land 925,000      
Buildings 9,224,000      
Total 10,149,000      
Accumulated Depreciation $ 6,051,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Greenfield, IN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,807,000      
Buildings 10,335,000      
Cost Capitalized Subsequent to Acquisition 223,000      
Increase (Decrease) in Net Investments (8,383,000)      
Gross Amount at which Carried at Close of Period        
Land 967,000      
Buildings 4,015,000      
Total 4,982,000      
Accumulated Depreciation $ 2,431,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facilities in Apopka, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 362,000      
Buildings 10,855,000      
Cost Capitalized Subsequent to Acquisition 1,195,000      
Increase (Decrease) in Net Investments (155,000)      
Gross Amount at which Carried at Close of Period        
Land 337,000      
Buildings 11,920,000      
Total 12,257,000      
Accumulated Depreciation $ 5,155,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Land in San Leandro, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,532,000      
Buildings 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,532,000      
Buildings 0      
Total 1,532,000      
Accumulated Depreciation 0      
Real Estate Subject to Operating Leases | Retail facility in Austin, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 1,725,000      
Buildings 5,168,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,725,000      
Buildings 5,168,000      
Total 6,893,000      
Accumulated Depreciation $ 3,098,000      
Life on which Depreciation in Latest Statement of  Income is Computed 29 years      
Real Estate Subject to Operating Leases | Retail facility in Wroclaw, Poland        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,600,000      
Buildings 10,306,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (3,913,000)      
Gross Amount at which Carried at Close of Period        
Land 2,763,000      
Buildings 7,230,000      
Total 9,993,000      
Accumulated Depreciation $ 2,867,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Mallorca, Spain        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 11,109,000      
Buildings 12,636,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (1,780,000)      
Gross Amount at which Carried at Close of Period        
Land 10,257,000      
Buildings 11,708,000      
Total 21,965,000      
Accumulated Depreciation $ 3,973,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in Auburn, IN; Clinton Township, MI; and Bluffton, OH        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,403,000      
Buildings 20,298,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (3,870,000)      
Gross Amount at which Carried at Close of Period        
Land 2,589,000      
Buildings 18,242,000      
Total 20,831,000      
Accumulated Depreciation $ 6,553,000      
Life on which Depreciation in Latest Statement of  Income is Computed 30 years      
Real Estate Subject to Operating Leases | Land in Irvine, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,173,000      
Buildings 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 4,173,000      
Buildings 0      
Total 4,173,000      
Accumulated Depreciation 0      
Real Estate Subject to Operating Leases | Industrial facility in Alpharetta, GA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 2,198,000      
Buildings 6,349,000      
Cost Capitalized Subsequent to Acquisition 1,247,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,198,000      
Buildings 7,596,000      
Total 9,794,000      
Accumulated Depreciation $ 2,967,000      
Life on which Depreciation in Latest Statement of  Income is Computed 30 years      
Real Estate Subject to Operating Leases | Warehouse facility in St. Petersburg, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,280,000      
Buildings 24,627,000      
Cost Capitalized Subsequent to Acquisition 4,675,000      
Increase (Decrease) in Net Investments (20,393,000)      
Gross Amount at which Carried at Close of Period        
Land 1,814,000      
Buildings 10,375,000      
Total 12,189,000      
Accumulated Depreciation $ 3,794,000      
Life on which Depreciation in Latest Statement of  Income is Computed 30 years      
Real Estate Subject to Operating Leases | Retail facility in Baton Rouge, LA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,168,000      
Buildings 5,724,000      
Cost Capitalized Subsequent to Acquisition 3,200,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 4,168,000      
Buildings 8,924,000      
Total 13,092,000      
Accumulated Depreciation $ 3,510,000      
Life on which Depreciation in Latest Statement of  Income is Computed 30 years      
Real Estate Subject to Operating Leases | Research and development facility in San Diego, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 7,804,000      
Buildings 16,729,000      
Cost Capitalized Subsequent to Acquisition 5,939,000      
Increase (Decrease) in Net Investments (832,000)      
Gross Amount at which Carried at Close of Period        
Land 7,804,000      
Buildings 21,836,000      
Total 29,640,000      
Accumulated Depreciation $ 8,476,000      
Life on which Depreciation in Latest Statement of  Income is Computed 30 years      
Real Estate Subject to Operating Leases | Industrial facility in Richmond, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 895,000      
Buildings 1,953,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 895,000      
Buildings 1,953,000      
Total 2,848,000      
Accumulated Depreciation $ 734,000      
Life on which Depreciation in Latest Statement of  Income is Computed 30 years      
Real Estate Subject to Operating Leases | Warehouse facilities in the United States        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 16,386,000      
Buildings 84,668,000      
Cost Capitalized Subsequent to Acquisition 14,997,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 16,386,000      
Buildings 99,665,000      
Total 116,051,000      
Accumulated Depreciation $ 33,568,000      
Life on which Depreciation in Latest Statement of  Income is Computed 30 years      
Real Estate Subject to Operating Leases | Industrial facilities in Rocky Mount, NC and Lewisville, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,163,000      
Buildings 17,715,000      
Cost Capitalized Subsequent to Acquisition 609,000      
Increase (Decrease) in Net Investments (8,389,000)      
Gross Amount at which Carried at Close of Period        
Land 1,132,000      
Buildings 10,966,000      
Total 12,098,000      
Accumulated Depreciation $ 4,109,000      
Life on which Depreciation in Latest Statement of  Income is Computed 30 years      
Real Estate Subject to Operating Leases | Industrial facilities in Chattanooga, TN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 558,000      
Buildings 5,923,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 558,000      
Buildings 5,923,000      
Total 6,481,000      
Accumulated Depreciation $ 2,202,000      
Life on which Depreciation in Latest Statement of  Income is Computed 30 years      
Real Estate Subject to Operating Leases | Industrial facility in Mooresville, NC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 756,000      
Buildings 9,775,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 756,000      
Buildings 9,775,000      
Total 10,531,000      
Accumulated Depreciation $ 3,624,000      
Life on which Depreciation in Latest Statement of  Income is Computed 30 years      
Real Estate Subject to Operating Leases | Industrial facility in McCalla, AL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 960,000      
Buildings 14,472,000      
Cost Capitalized Subsequent to Acquisition 42,662,000      
Increase (Decrease) in Net Investments (254,000)      
Gross Amount at which Carried at Close of Period        
Land 2,076,000      
Buildings 55,764,000      
Total 57,840,000      
Accumulated Depreciation $ 14,475,000      
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Industrial facility in Fort Smith, AZ        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,063,000      
Buildings 6,159,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,063,000      
Buildings 6,159,000      
Total 7,222,000      
Accumulated Depreciation $ 2,259,000      
Life on which Depreciation in Latest Statement of  Income is Computed 30 years      
Real Estate Subject to Operating Leases | Retail facilities in Greenwood, IN and Buffalo, NY        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 617,000      
Initial Cost to Company        
Land 0      
Buildings 19,990,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 0      
Buildings 19,990,000      
Total 19,990,000      
Accumulated Depreciation $ 7,252,000      
Real Estate Subject to Operating Leases | Retail facilities in Greenwood, IN and Buffalo, NY | Minimum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 30 years      
Real Estate Subject to Operating Leases | Retail facilities in Greenwood, IN and Buffalo, NY | Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Industrial facilities in Bowling Green, KY and Jackson, TN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,492,000      
Buildings 8,182,000      
Cost Capitalized Subsequent to Acquisition 600,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,492,000      
Buildings 8,782,000      
Total 10,274,000      
Accumulated Depreciation $ 3,061,000      
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Education facility in Rancho Cucamonga, CA and laboratory facility in Exton, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 14,006,000      
Buildings 33,683,000      
Cost Capitalized Subsequent to Acquisition 9,659,000      
Increase (Decrease) in Net Investments (20,142,000)      
Gross Amount at which Carried at Close of Period        
Land 6,638,000      
Buildings 30,568,000      
Total 37,206,000      
Accumulated Depreciation $ 9,521,000      
Real Estate Subject to Operating Leases | Education facility in Rancho Cucamonga, CA and laboratory facility in Exton, PA | Minimum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Education facility in Rancho Cucamonga, CA and laboratory facility in Exton, PA | Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 32 years      
Real Estate Subject to Operating Leases | Industrial facilities in St. Petersburg, FL; Buffalo Grove, IL; West Lafayette, IN; Excelsior Springs, MO; and North Versailles, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 6,559,000      
Buildings 19,078,000      
Cost Capitalized Subsequent to Acquisition 3,285,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 6,559,000      
Buildings 22,363,000      
Total 28,922,000      
Accumulated Depreciation $ 7,456,000      
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Industrial and warehouse facility in Mesquite, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,702,000      
Buildings 13,029,000      
Cost Capitalized Subsequent to Acquisition 1,450,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,702,000      
Buildings 14,479,000      
Total 17,181,000      
Accumulated Depreciation $ 928,000      
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Industrial facilities in Tolleson, AZ; Alsip, IL; and Solvay, NY        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 6,080,000      
Buildings 23,424,000      
Cost Capitalized Subsequent to Acquisition 546,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 6,080,000      
Buildings 23,970,000      
Total 30,050,000      
Accumulated Depreciation $ 8,465,000      
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Retail facility in Memphis, TN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,877,000      
Buildings 4,258,000      
Cost Capitalized Subsequent to Acquisition 5,215,000      
Increase (Decrease) in Net Investments (2,353,000)      
Gross Amount at which Carried at Close of Period        
Land 2,027,000      
Buildings 9,970,000      
Total 11,997,000      
Accumulated Depreciation $ 5,003,000      
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Warehouse facilities in Oceanside, CA and Concordville, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 578,000      
Initial Cost to Company        
Land 3,333,000      
Buildings 8,270,000      
Cost Capitalized Subsequent to Acquisition 116,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,333,000      
Buildings 8,386,000      
Total 11,719,000      
Accumulated Depreciation $ 2,984,000      
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Warehouse facility in La Vista, NE        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 16,339,000      
Initial Cost to Company        
Land 4,196,000      
Buildings 23,148,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 4,196,000      
Buildings 23,148,000      
Total 27,344,000      
Accumulated Depreciation $ 7,787,000      
Life on which Depreciation in Latest Statement of  Income is Computed 33 years      
Real Estate Subject to Operating Leases | Laboratory facility in Pleasanton, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,675,000      
Buildings 7,468,000      
Cost Capitalized Subsequent to Acquisition 14,855,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,675,000      
Buildings 22,323,000      
Total 25,998,000      
Accumulated Depreciation $ 2,809,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Office facility in Chicago, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,169,000      
Buildings 19,010,000      
Cost Capitalized Subsequent to Acquisition 83,000      
Increase (Decrease) in Net Investments (72,000)      
Gross Amount at which Carried at Close of Period        
Land 2,169,000      
Buildings 19,021,000      
Total 21,190,000      
Accumulated Depreciation $ 6,726,000      
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Industrial facilities in Hollywood and Orlando, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,639,000      
Buildings 1,269,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,639,000      
Buildings 1,269,000      
Total 4,908,000      
Accumulated Depreciation $ 448,000      
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Warehouse facility in Golden, CO        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 808,000      
Buildings 4,304,000      
Cost Capitalized Subsequent to Acquisition 77,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 808,000      
Buildings 4,381,000      
Total 5,189,000      
Accumulated Depreciation $ 1,701,000      
Life on which Depreciation in Latest Statement of  Income is Computed 30 years      
Real Estate Subject to Operating Leases | Industrial facility in Texarkana, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,755,000      
Buildings 4,493,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (2,783,000)      
Gross Amount at which Carried at Close of Period        
Land 216,000      
Buildings 3,249,000      
Total 3,465,000      
Accumulated Depreciation $ 1,148,000      
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Industrial facility in South Jordan, UT        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,183,000      
Buildings 11,340,000      
Cost Capitalized Subsequent to Acquisition 2,254,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,183,000      
Buildings 13,594,000      
Total 15,777,000      
Accumulated Depreciation $ 4,572,000      
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Warehouse facility in Ennis, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 478,000      
Buildings 4,087,000      
Cost Capitalized Subsequent to Acquisition 145,000      
Increase (Decrease) in Net Investments (145,000)      
Gross Amount at which Carried at Close of Period        
Land 478,000      
Buildings 4,087,000      
Total 4,565,000      
Accumulated Depreciation $ 1,444,000      
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Specialty facility in Paris, France        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 23,387,000      
Buildings 43,450,000      
Cost Capitalized Subsequent to Acquisition 703,000      
Increase (Decrease) in Net Investments (9,432,000)      
Gross Amount at which Carried at Close of Period        
Land 20,095,000      
Buildings 38,013,000      
Total 58,108,000      
Accumulated Depreciation $ 12,958,000      
Life on which Depreciation in Latest Statement of  Income is Computed 32 years      
Real Estate Subject to Operating Leases | Retail facilities in Poland        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 26,564,000      
Buildings 72,866,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (14,035,000)      
Gross Amount at which Carried at Close of Period        
Land 22,785,000      
Buildings 62,610,000      
Total 85,395,000      
Accumulated Depreciation $ 29,617,000      
Real Estate Subject to Operating Leases | Retail facilities in Poland | Minimum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 23 years      
Real Estate Subject to Operating Leases | Retail facilities in Poland | Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 34 years      
Real Estate Subject to Operating Leases | Industrial facilities in Danbury, CT and Bedford, MA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,519,000      
Buildings 16,329,000      
Cost Capitalized Subsequent to Acquisition 43,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,519,000      
Buildings 16,372,000      
Total 19,891,000      
Accumulated Depreciation $ 6,157,000      
Life on which Depreciation in Latest Statement of  Income is Computed 29 years      
Real Estate Subject to Operating Leases | Industrial facility in Brownwood, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 722,000      
Buildings 6,268,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 722,000      
Buildings 6,268,000      
Total 6,990,000      
Accumulated Depreciation $ 2,089,000      
Life on which Depreciation in Latest Statement of  Income is Computed 15 years      
Real Estate Subject to Operating Leases | Industrial facility in Rochester, MN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 809,000      
Buildings 14,236,000      
Cost Capitalized Subsequent to Acquisition 3,351,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 809,000      
Buildings 17,587,000      
Total 18,396,000      
Accumulated Depreciation $ 1,198,000      
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Office facility in Salford, United Kingdom        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 0      
Buildings 30,012,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (9,122,000)      
Gross Amount at which Carried at Close of Period        
Land 0      
Buildings 20,890,000      
Total 20,890,000      
Accumulated Depreciation $ 6,405,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Office facility in Mönchengladbach, Germany        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 27,300,000      
Initial Cost to Company        
Land 2,154,000      
Buildings 6,917,000      
Cost Capitalized Subsequent to Acquisition 50,626,000      
Increase (Decrease) in Net Investments (2,678,000)      
Gross Amount at which Carried at Close of Period        
Land 2,122,000      
Buildings 54,897,000      
Total 57,019,000      
Accumulated Depreciation $ 11,162,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facility in Houston, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,430,000      
Buildings 2,270,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,430,000      
Buildings 2,270,000      
Total 4,700,000      
Accumulated Depreciation $ 1,004,000      
Life on which Depreciation in Latest Statement of  Income is Computed 23 years      
Real Estate Subject to Operating Leases | Retail facility in St. Charles, MO        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,966,000      
Buildings 1,368,000      
Cost Capitalized Subsequent to Acquisition 1,658,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,966,000      
Buildings 3,026,000      
Total 4,992,000      
Accumulated Depreciation $ 1,329,000      
Life on which Depreciation in Latest Statement of  Income is Computed 27 years      
Real Estate Subject to Operating Leases | Industrial facility in Aurora, CO        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 737,000      
Buildings 2,609,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 737,000      
Buildings 2,609,000      
Total 3,346,000      
Accumulated Depreciation $ 819,000      
Life on which Depreciation in Latest Statement of  Income is Computed 32 years      
Real Estate Subject to Operating Leases | Warehouse facility in Burlington, NJ        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,989,000      
Buildings 6,213,000      
Cost Capitalized Subsequent to Acquisition 377,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,989,000      
Buildings 6,590,000      
Total 10,579,000      
Accumulated Depreciation $ 2,588,000      
Life on which Depreciation in Latest Statement of  Income is Computed 26 years      
Real Estate Subject to Operating Leases | Industrial facility in Albuquerque, NM        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,467,000      
Buildings 3,476,000      
Cost Capitalized Subsequent to Acquisition 715,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,467,000      
Buildings 4,191,000      
Total 6,658,000      
Accumulated Depreciation $ 1,609,000      
Life on which Depreciation in Latest Statement of  Income is Computed 27 years      
Real Estate Subject to Operating Leases | Industrial facility in North Salt Lake, UT        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 10,601,000      
Buildings 17,626,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (16,936,000)      
Gross Amount at which Carried at Close of Period        
Land 4,388,000      
Buildings 6,903,000      
Total 11,291,000      
Accumulated Depreciation $ 2,616,000      
Life on which Depreciation in Latest Statement of  Income is Computed 26 years      
Real Estate Subject to Operating Leases | Industrial facility in Lexington, NC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,185,000      
Buildings 12,058,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (2,519,000)      
Gross Amount at which Carried at Close of Period        
Land 494,000      
Buildings 11,230,000      
Total 11,724,000      
Accumulated Depreciation $ 4,012,000      
Life on which Depreciation in Latest Statement of  Income is Computed 28 years      
Real Estate Subject to Operating Leases | Industrial facility in Dallas, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,190,000      
Buildings 10,010,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,190,000      
Buildings 10,010,000      
Total 13,200,000      
Accumulated Depreciation $ 451,000      
Life on which Depreciation in Latest Statement of  Income is Computed 32 years      
Real Estate Subject to Operating Leases | Land in Welcome, NC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 980,000      
Buildings 11,230,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (11,724,000)      
Gross Amount at which Carried at Close of Period        
Land 486,000      
Buildings 0      
Total 486,000      
Accumulated Depreciation 0      
Real Estate Subject to Operating Leases | Industrial facilities in Evansville, IN; Lawrence, KS; and Baltimore, MD        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 4,005,000      
Buildings 44,192,000      
Cost Capitalized Subsequent to Acquisition 20,636,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 4,005,000      
Buildings 64,828,000      
Total 68,833,000      
Accumulated Depreciation $ 19,478,000      
Life on which Depreciation in Latest Statement of  Income is Computed 24 years      
Real Estate Subject to Operating Leases | Industrial facilities in Colton, CA; Bonner Springs, KS; Eagan, MN; and Dallas, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 8,451,000      
Buildings 25,457,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 11,200,000      
Gross Amount at which Carried at Close of Period        
Land 8,451,000      
Buildings 36,657,000      
Total 45,108,000      
Accumulated Depreciation $ 9,183,000      
Real Estate Subject to Operating Leases | Industrial facilities in Colton, CA; Bonner Springs, KS; Eagan, MN; and Dallas, TX | Minimum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 17 years      
Real Estate Subject to Operating Leases | Industrial facilities in Colton, CA; Bonner Springs, KS; Eagan, MN; and Dallas, TX | Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 34 years      
Real Estate Subject to Operating Leases | Retail facility in Torrance, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 8,412,000      
Buildings 12,241,000      
Cost Capitalized Subsequent to Acquisition 2,468,000      
Increase (Decrease) in Net Investments (77,000)      
Gross Amount at which Carried at Close of Period        
Land 8,335,000      
Buildings 14,709,000      
Total 23,044,000      
Accumulated Depreciation $ 5,863,000      
Life on which Depreciation in Latest Statement of  Income is Computed 25 years      
Real Estate Subject to Operating Leases | Warehouse facility in Houston, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 6,578,000      
Buildings 424,000      
Cost Capitalized Subsequent to Acquisition 560,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 6,578,000      
Buildings 984,000      
Total 7,562,000      
Accumulated Depreciation $ 733,000      
Life on which Depreciation in Latest Statement of  Income is Computed 27 years      
Real Estate Subject to Operating Leases | Warehouse facility in Norwich, CT        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,885,000      
Buildings 21,342,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 2,000      
Gross Amount at which Carried at Close of Period        
Land 3,885,000      
Buildings 21,344,000      
Total 25,229,000      
Accumulated Depreciation $ 7,492,000      
Life on which Depreciation in Latest Statement of  Income is Computed 28 years      
Real Estate Subject to Operating Leases | Warehouse facility in Norwich, CT        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,437,000      
Buildings 9,669,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,437,000      
Buildings 9,669,000      
Total 11,106,000      
Accumulated Depreciation $ 3,394,000      
Life on which Depreciation in Latest Statement of  Income is Computed 28 years      
Real Estate Subject to Operating Leases | Warehouse facility in Whitehall, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 7,435,000      
Buildings 9,093,000      
Cost Capitalized Subsequent to Acquisition 27,148,000      
Increase (Decrease) in Net Investments (9,545,000)      
Gross Amount at which Carried at Close of Period        
Land 6,983,000      
Buildings 27,148,000      
Total 34,131,000      
Accumulated Depreciation $ 1,721,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facility in York, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,776,000      
Buildings 10,092,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (6,413,000)      
Gross Amount at which Carried at Close of Period        
Land 527,000      
Buildings 6,928,000      
Total 7,455,000      
Accumulated Depreciation $ 2,035,000      
Life on which Depreciation in Latest Statement of  Income is Computed 34 years      
Real Estate Subject to Operating Leases | Warehouse facilities in Atlanta, GA and Elkwood, VA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 5,356,000      
Buildings 4,121,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (3,219,000)      
Gross Amount at which Carried at Close of Period        
Land 4,284,000      
Buildings 1,974,000      
Total 6,258,000      
Accumulated Depreciation $ 703,000      
Life on which Depreciation in Latest Statement of  Income is Computed 28 years      
Real Estate Subject to Operating Leases | Warehouse facility in Harrisburg, NC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,753,000      
Buildings 5,840,000      
Cost Capitalized Subsequent to Acquisition 781,000      
Increase (Decrease) in Net Investments (111,000)      
Gross Amount at which Carried at Close of Period        
Land 1,642,000      
Buildings 6,621,000      
Total 8,263,000      
Accumulated Depreciation $ 2,347,000      
Life on which Depreciation in Latest Statement of  Income is Computed 26 years      
Real Estate Subject to Operating Leases | Industrial facility in Chandler, AZ; and industrial and warehouse facility in Englewood, CO        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 857,000      
Initial Cost to Company        
Land 4,306,000      
Buildings 7,235,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 3,000      
Gross Amount at which Carried at Close of Period        
Land 4,306,000      
Buildings 7,238,000      
Total 11,544,000      
Accumulated Depreciation $ 2,372,000      
Life on which Depreciation in Latest Statement of  Income is Computed 30 years      
Real Estate Subject to Operating Leases | Industrial facility in Cynthiana, KY        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 510,000      
Initial Cost to Company        
Land 1,274,000      
Buildings 3,505,000      
Cost Capitalized Subsequent to Acquisition 525,000      
Increase (Decrease) in Net Investments (107,000)      
Gross Amount at which Carried at Close of Period        
Land 1,274,000      
Buildings 3,923,000      
Total 5,197,000      
Accumulated Depreciation $ 1,407,000      
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Industrial facilities in Albemarle and Old Fort, NC and Holmesville, OH        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 5,507,000      
Buildings 18,653,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 5,507,000      
Buildings 18,653,000      
Total 24,160,000      
Accumulated Depreciation $ 1,299,000      
Life on which Depreciation in Latest Statement of  Income is Computed 32 years      
Real Estate Subject to Operating Leases | Industrial facility in Columbia, SC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,843,000      
Buildings 11,886,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,843,000      
Buildings 11,886,000      
Total 14,729,000      
Accumulated Depreciation $ 5,218,000      
Life on which Depreciation in Latest Statement of  Income is Computed 23 years      
Real Estate Subject to Operating Leases | Retail facility in Midlothian, VA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,824,000      
Buildings 16,618,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,824,000      
Buildings 16,618,000      
Total 19,442,000      
Accumulated Depreciation $ 2,969,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Specialty facility in Laramie, WY        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,966,000      
Buildings 18,896,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,966,000      
Buildings 18,896,000      
Total 20,862,000      
Accumulated Depreciation $ 6,456,000      
Life on which Depreciation in Latest Statement of  Income is Computed 33 years      
Real Estate Subject to Operating Leases | Warehouse facilities in Mendota, IL; Toppenish, WA; and Plover, WI        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,444,000      
Buildings 21,208,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (623,000)      
Gross Amount at which Carried at Close of Period        
Land 1,382,000      
Buildings 20,647,000      
Total 22,029,000      
Accumulated Depreciation $ 9,132,000      
Life on which Depreciation in Latest Statement of  Income is Computed 23 years      
Real Estate Subject to Operating Leases | Land in Sunnyvale, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 9,297,000      
Buildings 24,086,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (26,077,000)      
Gross Amount at which Carried at Close of Period        
Land 7,306,000      
Buildings 0      
Total 7,306,000      
Accumulated Depreciation 0      
Real Estate Subject to Operating Leases | Industrial facilities in Hampton, NH        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 8,990,000      
Buildings 7,362,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 8,990,000      
Buildings 7,362,000      
Total 16,352,000      
Accumulated Depreciation $ 2,406,000      
Life on which Depreciation in Latest Statement of  Income is Computed 30 years      
Real Estate Subject to Operating Leases | Industrial facilities in France        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 36,306,000      
Buildings 5,212,000      
Cost Capitalized Subsequent to Acquisition 3,114,000      
Increase (Decrease) in Net Investments 4,799,000      
Gross Amount at which Carried at Close of Period        
Land 25,290,000      
Buildings 24,141,000      
Total 49,431,000      
Accumulated Depreciation $ 3,810,000      
Life on which Depreciation in Latest Statement of  Income is Computed 23 years      
Real Estate Subject to Operating Leases | Retail facility in Lombard, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 5,087,000      
Buildings 8,578,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 5,087,000      
Buildings 8,578,000      
Total 13,665,000      
Accumulated Depreciation $ 3,230,000      
Life on which Depreciation in Latest Statement of  Income is Computed 26 years      
Real Estate Subject to Operating Leases | Warehouse facility in Plainfield, IN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,578,000      
Buildings 29,415,000      
Cost Capitalized Subsequent to Acquisition 2,176,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,578,000      
Buildings 31,591,000      
Total 33,169,000      
Accumulated Depreciation $ 9,873,000      
Life on which Depreciation in Latest Statement of  Income is Computed 30 years      
Real Estate Subject to Operating Leases | Retail facility in Kennesaw, GA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,849,000      
Buildings 6,180,000      
Cost Capitalized Subsequent to Acquisition 5,530,000      
Increase (Decrease) in Net Investments (76,000)      
Gross Amount at which Carried at Close of Period        
Land 2,773,000      
Buildings 11,710,000      
Total 14,483,000      
Accumulated Depreciation $ 4,563,000      
Life on which Depreciation in Latest Statement of  Income is Computed 26 years      
Real Estate Subject to Operating Leases | Retail facility in Leawood, KS        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,487,000      
Buildings 13,417,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,487,000      
Buildings 13,417,000      
Total 14,904,000      
Accumulated Depreciation $ 5,051,000      
Life on which Depreciation in Latest Statement of  Income is Computed 26 years      
Real Estate Subject to Operating Leases | Industrial facility in Tolland, CT        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,817,000      
Buildings 5,709,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 11,000      
Gross Amount at which Carried at Close of Period        
Land 1,817,000      
Buildings 5,720,000      
Total 7,537,000      
Accumulated Depreciation $ 2,068,000      
Life on which Depreciation in Latest Statement of  Income is Computed 28 years      
Real Estate Subject to Operating Leases | Warehouse facilities in Lincolnton, NC and Mauldin, SC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,962,000      
Buildings 9,247,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,962,000      
Buildings 9,247,000      
Total 11,209,000      
Accumulated Depreciation $ 3,265,000      
Life on which Depreciation in Latest Statement of  Income is Computed 28 years      
Real Estate Subject to Operating Leases | Retail facilities in Germany        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 81,109,000      
Buildings 153,927,000      
Cost Capitalized Subsequent to Acquisition 10,510,000      
Increase (Decrease) in Net Investments (138,475,000)      
Gross Amount at which Carried at Close of Period        
Land 27,233,000      
Buildings 79,838,000      
Total 107,071,000      
Accumulated Depreciation 26,426,000      
Real Estate Subject to Operating Leases | Laboratory facility in The Woodlands, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 3,204,000      
Buildings 24,997,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,204,000      
Buildings 24,997,000      
Total 28,201,000      
Accumulated Depreciation $ 7,868,000      
Life on which Depreciation in Latest Statement of  Income is Computed 32 years      
Real Estate Subject to Operating Leases | Warehouse facilities in Valdosta, GA and Johnson City, TN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,080,000      
Buildings 14,998,000      
Cost Capitalized Subsequent to Acquisition 1,841,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,080,000      
Buildings 16,839,000      
Total 17,919,000      
Accumulated Depreciation $ 6,064,000      
Life on which Depreciation in Latest Statement of  Income is Computed 27 years      
Real Estate Subject to Operating Leases | Industrial facility in Amherst, NY        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 5,446,000      
Initial Cost to Company        
Land 674,000      
Buildings 7,971,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 674,000      
Buildings 7,971,000      
Total 8,645,000      
Accumulated Depreciation $ 3,526,000      
Life on which Depreciation in Latest Statement of  Income is Computed 23 years      
Real Estate Subject to Operating Leases | Industrial and warehouse facilities in Westfield, MA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,922,000      
Buildings 9,755,000      
Cost Capitalized Subsequent to Acquisition 7,435,000      
Increase (Decrease) in Net Investments 9,000      
Gross Amount at which Carried at Close of Period        
Land 1,922,000      
Buildings 17,199,000      
Total 19,121,000      
Accumulated Depreciation $ 6,650,000      
Life on which Depreciation in Latest Statement of  Income is Computed 28 years      
Real Estate Subject to Operating Leases | Warehouse facility in Gorinchem, Netherlands        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,143,000      
Buildings 5,648,000      
Cost Capitalized Subsequent to Acquisition 131,000      
Increase (Decrease) in Net Investments (1,276,000)      
Gross Amount at which Carried at Close of Period        
Land 928,000      
Buildings 4,718,000      
Total 5,646,000      
Accumulated Depreciation $ 1,604,000      
Life on which Depreciation in Latest Statement of  Income is Computed 28 years      
Real Estate Subject to Operating Leases | Retail facility in Cresskill, NJ        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,366,000      
Buildings 5,482,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 19,000      
Gross Amount at which Carried at Close of Period        
Land 2,366,000      
Buildings 5,501,000      
Total 7,867,000      
Accumulated Depreciation $ 1,751,000      
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Retail facility in Livingston, NJ        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,932,000      
Buildings 2,001,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 14,000      
Gross Amount at which Carried at Close of Period        
Land 2,932,000      
Buildings 2,015,000      
Total 4,947,000      
Accumulated Depreciation $ 735,000      
Life on which Depreciation in Latest Statement of  Income is Computed 27 years      
Real Estate Subject to Operating Leases | Retail facility in Montclair, NJ        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,905,000      
Buildings 1,403,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 6,000      
Gross Amount at which Carried at Close of Period        
Land 1,905,000      
Buildings 1,409,000      
Total 3,314,000      
Accumulated Depreciation $ 514,000      
Life on which Depreciation in Latest Statement of  Income is Computed 27 years      
Real Estate Subject to Operating Leases | Retail facility in Morristown, NJ        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,258,000      
Buildings 8,352,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 26,000      
Gross Amount at which Carried at Close of Period        
Land 3,258,000      
Buildings 8,378,000      
Total 11,636,000      
Accumulated Depreciation $ 3,058,000      
Life on which Depreciation in Latest Statement of  Income is Computed 27 years      
Real Estate Subject to Operating Leases | Retail facility in Summit, NJ        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,228,000      
Buildings 1,465,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 8,000      
Gross Amount at which Carried at Close of Period        
Land 1,228,000      
Buildings 1,473,000      
Total 2,701,000      
Accumulated Depreciation $ 538,000      
Life on which Depreciation in Latest Statement of  Income is Computed 27 years      
Real Estate Subject to Operating Leases | Industrial facilities in Georgetown, TX and Woodland, WA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 965,000      
Buildings 4,113,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 965,000      
Buildings 4,113,000      
Total 5,078,000      
Accumulated Depreciation $ 1,209,000      
Real Estate Subject to Operating Leases | Industrial facilities in Georgetown, TX and Woodland, WA | Minimum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 33 years      
Real Estate Subject to Operating Leases | Industrial facilities in Georgetown, TX and Woodland, WA | Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 35 years      
Real Estate Subject to Operating Leases | Education facilities in Union, NJ; Allentown and Philadelphia, PA; and Grand Prairie, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 5,365,000      
Buildings 7,845,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 5,000      
Gross Amount at which Carried at Close of Period        
Land 5,365,000      
Buildings 7,850,000      
Total 13,215,000      
Accumulated Depreciation $ 2,796,000      
Life on which Depreciation in Latest Statement of  Income is Computed 28 years      
Real Estate Subject to Operating Leases | Industrial facility in Salisbury, NC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,499,000      
Buildings 8,185,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,499,000      
Buildings 8,185,000      
Total 9,684,000      
Accumulated Depreciation $ 2,924,000      
Life on which Depreciation in Latest Statement of  Income is Computed 28 years      
Real Estate Subject to Operating Leases | Industrial facility in Twinsburg, OH        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,831,000      
Buildings 10,565,000      
Cost Capitalized Subsequent to Acquisition 386,000      
Increase (Decrease) in Net Investments (6,975,000)      
Gross Amount at which Carried at Close of Period        
Land 1,293,000      
Buildings 5,514,000      
Total 6,807,000      
Accumulated Depreciation $ 2,000,000      
Life on which Depreciation in Latest Statement of  Income is Computed 27 years      
Real Estate Subject to Operating Leases | Industrial facility in Cambridge, Canada        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,849,000      
Buildings 7,371,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (1,441,000)      
Gross Amount at which Carried at Close of Period        
Land 1,560,000      
Buildings 6,219,000      
Total 7,779,000      
Accumulated Depreciation $ 1,974,000      
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Industrial facilities in Peru, IL; Huber Heights, Lima, and Sheffield, OH; and Lebanon, TN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,962,000      
Buildings 17,832,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,962,000      
Buildings 17,832,000      
Total 20,794,000      
Accumulated Depreciation $ 5,658,000      
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Industrial facility in Ramos Arizpe, Mexico        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,059,000      
Buildings 2,886,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,059,000      
Buildings 2,886,000      
Total 3,945,000      
Accumulated Depreciation $ 913,000      
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Industrial facilities in Salt Lake City, UT        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,783,000      
Buildings 3,773,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,783,000      
Buildings 3,773,000      
Total 6,556,000      
Accumulated Depreciation $ 1,196,000      
Real Estate Subject to Operating Leases | Industrial facilities in Salt Lake City, UT | Minimum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Industrial facilities in Salt Lake City, UT | Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 33 years      
Real Estate Subject to Operating Leases | Specialty facility in Blairsville, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,631,000      
Buildings 23,163,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,631,000      
Buildings 23,163,000      
Total 24,794,000      
Accumulated Depreciation $ 7,718,000      
Life on which Depreciation in Latest Statement of  Income is Computed 33 years      
Real Estate Subject to Operating Leases | Education facility in Mooresville, NC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,795,000      
Buildings 15,955,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,795,000      
Buildings 15,955,000      
Total 17,750,000      
Accumulated Depreciation $ 1,465,000      
Life on which Depreciation in Latest Statement of  Income is Computed 33 years      
Real Estate Subject to Operating Leases | Warehouse facilities in Atlanta, Doraville, and Rockmart, GA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 6,488,000      
Buildings 77,192,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 6,488,000      
Buildings 77,192,000      
Total 83,680,000      
Accumulated Depreciation $ 26,827,000      
Real Estate Subject to Operating Leases | Warehouse facilities in Atlanta, Doraville, and Rockmart, GA | Minimum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 23 years      
Real Estate Subject to Operating Leases | Warehouse facilities in Atlanta, Doraville, and Rockmart, GA | Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 33 years      
Real Estate Subject to Operating Leases | Warehouse facility in Muskogee, OK        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 554,000      
Buildings 4,353,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (3,437,000)      
Gross Amount at which Carried at Close of Period        
Land 158,000      
Buildings 1,312,000      
Total 1,470,000      
Accumulated Depreciation $ 397,000      
Life on which Depreciation in Latest Statement of  Income is Computed 33 years      
Real Estate Subject to Operating Leases | Industrial facility in Richmond, MO        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,211,000      
Buildings 8,505,000      
Cost Capitalized Subsequent to Acquisition 747,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,211,000      
Buildings 9,252,000      
Total 11,463,000      
Accumulated Depreciation $ 3,293,000      
Life on which Depreciation in Latest Statement of  Income is Computed 28 years      
Real Estate Subject to Operating Leases | Industrial facility in Tuusula, Finland        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 6,173,000      
Buildings 10,321,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (3,105,000)      
Gross Amount at which Carried at Close of Period        
Land 5,011,000      
Buildings 8,378,000      
Total 13,389,000      
Accumulated Depreciation $ 3,258,000      
Life on which Depreciation in Latest Statement of  Income is Computed 26 years      
Real Estate Subject to Operating Leases | Warehouse facility in Phoenix, AZ        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 6,747,000      
Buildings 21,352,000      
Cost Capitalized Subsequent to Acquisition 380,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 6,747,000      
Buildings 21,732,000      
Total 28,479,000      
Accumulated Depreciation $ 7,901,000      
Life on which Depreciation in Latest Statement of  Income is Computed 28 years      
Real Estate Subject to Operating Leases | Land in Calgary, Canada        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,721,000      
Buildings 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (582,000)      
Gross Amount at which Carried at Close of Period        
Land 3,139,000      
Buildings 0      
Total 3,139,000      
Accumulated Depreciation 0      
Real Estate Subject to Operating Leases | Industrial facilities in Kearney, MO; York, NE; Walbridge, OH; Rocky Mount, VA; and Martinsburg, WV        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 4,816,000      
Buildings 31,712,000      
Cost Capitalized Subsequent to Acquisition 1,078,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 4,816,000      
Buildings 32,790,000      
Total 37,606,000      
Accumulated Depreciation $ 1,168,000      
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Industrial facilities in Sandersville, GA; Erwin, TN; and Gainesville, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 955,000      
Buildings 4,779,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 955,000      
Buildings 4,779,000      
Total 5,734,000      
Accumulated Depreciation $ 1,528,000      
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Industrial facility in Buffalo Grove, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 1,960,000      
Initial Cost to Company        
Land 1,492,000      
Buildings 12,233,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,492,000      
Buildings 12,233,000      
Total 13,725,000      
Accumulated Depreciation $ 3,923,000      
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Warehouse facility in Carlsbad, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,230,000      
Buildings 5,492,000      
Cost Capitalized Subsequent to Acquisition 158,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,230,000      
Buildings 5,650,000      
Total 8,880,000      
Accumulated Depreciation $ 2,309,000      
Life on which Depreciation in Latest Statement of  Income is Computed 24 years      
Real Estate Subject to Operating Leases | Retail facility in Pensacola, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,746,000      
Buildings 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 5,181,000      
Gross Amount at which Carried at Close of Period        
Land 1,746,000      
Buildings 5,181,000      
Total 6,927,000      
Accumulated Depreciation $ 516,000      
Life on which Depreciation in Latest Statement of  Income is Computed 33 years      
Real Estate Subject to Operating Leases | Retail facility in Port St. Lucie, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,654,000      
Buildings 2,576,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 4,654,000      
Buildings 2,576,000      
Total 7,230,000      
Accumulated Depreciation $ 934,000      
Life on which Depreciation in Latest Statement of  Income is Computed 27 years      
Real Estate Subject to Operating Leases | Industrial facility in Nurieux-Volognat, France        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 121,000      
Buildings 5,328,000      
Cost Capitalized Subsequent to Acquisition 157,000      
Increase (Decrease) in Net Investments (925,000)      
Gross Amount at which Carried at Close of Period        
Land 98,000      
Buildings 4,583,000      
Total 4,681,000      
Accumulated Depreciation $ 1,357,000      
Life on which Depreciation in Latest Statement of  Income is Computed 32 years      
Real Estate Subject to Operating Leases | Industrial facility in Monheim, Germany        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,500,000      
Buildings 5,727,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (391,000)      
Gross Amount at which Carried at Close of Period        
Land 2,386,000      
Buildings 5,450,000      
Total 7,836,000      
Accumulated Depreciation $ 385,000      
Life on which Depreciation in Latest Statement of  Income is Computed 32 years      
Real Estate Subject to Operating Leases | Warehouse facility in Suwanee, GA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,330,000      
Buildings 8,406,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,330,000      
Buildings 8,406,000      
Total 10,736,000      
Accumulated Depreciation $ 2,463,000      
Life on which Depreciation in Latest Statement of  Income is Computed 34 years      
Real Estate Subject to Operating Leases | Retail facilities in Wichita, KS and Oklahoma City, OK and warehouse facility in Wichita, KS        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,878,000      
Buildings 8,579,000      
Cost Capitalized Subsequent to Acquisition 3,128,000      
Increase (Decrease) in Net Investments (89,000)      
Gross Amount at which Carried at Close of Period        
Land 1,878,000      
Buildings 11,618,000      
Total 13,496,000      
Accumulated Depreciation $ 3,877,000      
Life on which Depreciation in Latest Statement of  Income is Computed 24 years      
Real Estate Subject to Operating Leases | Industrial facilities in Fort Dodge, IA and Menomonie and Oconomowoc, WI        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,403,000      
Buildings 11,098,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,403,000      
Buildings 11,098,000      
Total 12,501,000      
Accumulated Depreciation $ 6,772,000      
Life on which Depreciation in Latest Statement of  Income is Computed 16 years      
Real Estate Subject to Operating Leases | Industrial facility in Mesa, AZ        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,888,000      
Buildings 4,282,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,888,000      
Buildings 4,282,000      
Total 7,170,000      
Accumulated Depreciation $ 1,558,000      
Life on which Depreciation in Latest Statement of  Income is Computed 27 years      
Real Estate Subject to Operating Leases | Industrial facility in North Amityville, NY        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,486,000      
Buildings 11,413,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,486,000      
Buildings 11,413,000      
Total 14,899,000      
Accumulated Depreciation $ 4,352,000      
Life on which Depreciation in Latest Statement of  Income is Computed 26 years      
Real Estate Subject to Operating Leases | Industrial facility in Fort Collins, CO        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 821,000      
Buildings 7,236,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 821,000      
Buildings 7,236,000      
Total 8,057,000      
Accumulated Depreciation $ 2,185,000      
Life on which Depreciation in Latest Statement of  Income is Computed 33 years      
Real Estate Subject to Operating Leases | Warehouse facility in Elk Grove Village, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,037,000      
Buildings 7,865,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 4,037,000      
Buildings 7,865,000      
Total 11,902,000      
Accumulated Depreciation $ 1,536,000      
Life on which Depreciation in Latest Statement of  Income is Computed 22 years      
Real Estate Subject to Operating Leases | Research and development facility in Washington, MI        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,085,000      
Buildings 7,496,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 4,085,000      
Buildings 7,496,000      
Total 11,581,000      
Accumulated Depreciation $ 2,269,000      
Life on which Depreciation in Latest Statement of  Income is Computed 33 years      
Real Estate Subject to Operating Leases | Industrial facilities in Conroe, Odessa, and Weimar, TX and industrial and office facility in Houston, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,049,000      
Buildings 13,021,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 133,000      
Gross Amount at which Carried at Close of Period        
Land 4,049,000      
Buildings 13,154,000      
Total 17,203,000      
Accumulated Depreciation $ 6,987,000      
Real Estate Subject to Operating Leases | Industrial facilities in Conroe, Odessa, and Weimar, TX and industrial and office facility in Houston, TX | Minimum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 12 years      
Real Estate Subject to Operating Leases | Industrial facilities in Conroe, Odessa, and Weimar, TX and industrial and office facility in Houston, TX | Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 22 years      
Real Estate Subject to Operating Leases | Education facility in Sacramento, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 0      
Buildings 13,715,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 0      
Buildings 13,715,000      
Total 13,715,000      
Accumulated Depreciation $ 4,070,000      
Life on which Depreciation in Latest Statement of  Income is Computed 34 years      
Real Estate Subject to Operating Leases | Industrial facility in Sankt Ingbert, Germany        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,226,000      
Buildings 17,460,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 314,000      
Gross Amount at which Carried at Close of Period        
Land 2,261,000      
Buildings 17,739,000      
Total 20,000,000      
Accumulated Depreciation $ 1,933,000      
Life on which Depreciation in Latest Statement of  Income is Computed 34 years      
Real Estate Subject to Operating Leases | Industrial facilities in City of Industry, CA; Chelmsford, MA; and Lancaster, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 5,138,000      
Buildings 8,387,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 43,000      
Gross Amount at which Carried at Close of Period        
Land 5,138,000      
Buildings 8,430,000      
Total 13,568,000      
Accumulated Depreciation $ 3,016,000      
Life on which Depreciation in Latest Statement of  Income is Computed 27 years      
Real Estate Subject to Operating Leases | Office facility in Tinton Falls, NJ        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,958,000      
Buildings 7,993,000      
Cost Capitalized Subsequent to Acquisition 725,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,958,000      
Buildings 8,718,000      
Total 10,676,000      
Accumulated Depreciation $ 2,780,000      
Life on which Depreciation in Latest Statement of  Income is Computed 31 years      
Real Estate Subject to Operating Leases | Industrial facility in Woodland, WA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 707,000      
Buildings 1,562,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 707,000      
Buildings 1,562,000      
Total 2,269,000      
Accumulated Depreciation $ 439,000      
Life on which Depreciation in Latest Statement of  Income is Computed 35 years      
Real Estate Subject to Operating Leases | Warehouse facilities in Gyál and Herceghalom, Hungary        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 14,601,000      
Buildings 21,915,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (6,874,000)      
Gross Amount at which Carried at Close of Period        
Land 11,852,000      
Buildings 17,790,000      
Total 29,642,000      
Accumulated Depreciation $ 8,640,000      
Life on which Depreciation in Latest Statement of  Income is Computed 21 years      
Real Estate Subject to Operating Leases | Industrial facility in Windsor, CT        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 453,000      
Buildings 637,000      
Cost Capitalized Subsequent to Acquisition 3,422,000      
Increase (Decrease) in Net Investments (83,000)      
Gross Amount at which Carried at Close of Period        
Land 453,000      
Buildings 3,976,000      
Total 4,429,000      
Accumulated Depreciation $ 774,000      
Life on which Depreciation in Latest Statement of  Income is Computed 33 years      
Real Estate Subject to Operating Leases | Industrial facility in Aurora, CO        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 574,000      
Buildings 3,999,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 574,000      
Buildings 3,999,000      
Total 4,573,000      
Accumulated Depreciation $ 1,010,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in University Park, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 7,962,000      
Buildings 32,756,000      
Cost Capitalized Subsequent to Acquisition 221,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 7,962,000      
Buildings 32,977,000      
Total 40,939,000      
Accumulated Depreciation $ 9,066,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Laboratory facility in Westborough, MA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,409,000      
Buildings 37,914,000      
Cost Capitalized Subsequent to Acquisition 53,065,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,409,000      
Buildings 90,979,000      
Total 94,388,000      
Accumulated Depreciation $ 15,252,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Research and development facility in Andover, MA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,980,000      
Buildings 45,120,000      
Cost Capitalized Subsequent to Acquisition 323,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,980,000      
Buildings 45,443,000      
Total 49,423,000      
Accumulated Depreciation $ 11,154,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Lewisburg, OH        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,627,000      
Buildings 13,721,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,627,000      
Buildings 13,721,000      
Total 15,348,000      
Accumulated Depreciation $ 3,525,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Opole, Poland        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,151,000      
Buildings 21,438,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (2,625,000)      
Gross Amount at which Carried at Close of Period        
Land 1,912,000      
Buildings 19,052,000      
Total 20,964,000      
Accumulated Depreciation $ 5,052,000      
Life on which Depreciation in Latest Statement of  Income is Computed 38 years      
Real Estate Subject to Operating Leases | Retail facilities in the United Kingdom        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 66,319,000      
Buildings 230,113,000      
Cost Capitalized Subsequent to Acquisition 277,000      
Increase (Decrease) in Net Investments (88,095,000)      
Gross Amount at which Carried at Close of Period        
Land 44,895,000      
Buildings 163,719,000      
Total 208,614,000      
Accumulated Depreciation $ 48,872,000      
Real Estate Subject to Operating Leases | Retail facilities in the United Kingdom | Minimum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 20 years      
Real Estate Subject to Operating Leases | Retail facilities in the United Kingdom | Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Rotterdam, Netherlands        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 0      
Buildings 33,935,000      
Cost Capitalized Subsequent to Acquisition 20,842,000      
Increase (Decrease) in Net Investments (1,418,000)      
Gross Amount at which Carried at Close of Period        
Land 0      
Buildings 53,359,000      
Total 53,359,000      
Accumulated Depreciation $ 10,205,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facility in Bad Fischau, Austria        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,855,000      
Buildings 18,829,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 552,000      
Gross Amount at which Carried at Close of Period        
Land 2,928,000      
Buildings 19,308,000      
Total 22,236,000      
Accumulated Depreciation $ 4,726,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Oskarshamn, Sweden        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,090,000      
Buildings 18,262,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (3,784,000)      
Gross Amount at which Carried at Close of Period        
Land 2,542,000      
Buildings 15,026,000      
Total 17,568,000      
Accumulated Depreciation $ 3,527,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in Gersthofen and Senden, Germany and Leopoldsdorf, Austria        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 9,449,000      
Buildings 15,838,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (187,000)      
Gross Amount at which Carried at Close of Period        
Land 9,379,000      
Buildings 15,721,000      
Total 25,100,000      
Accumulated Depreciation $ 3,850,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Net-lease hotels in the United States        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 0      
Buildings 49,190,000      
Cost Capitalized Subsequent to Acquisition 17,396,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 17,396,000      
Buildings 49,190,000      
Total 66,586,000      
Accumulated Depreciation $ 11,802,000      
Real Estate Subject to Operating Leases | Net-lease hotels in the United States | Minimum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 38 years      
Real Estate Subject to Operating Leases | Net-lease hotels in the United States | Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facilities in the Netherlands        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 5,698,000      
Buildings 38,130,000      
Cost Capitalized Subsequent to Acquisition 79,000      
Increase (Decrease) in Net Investments 1,264,000      
Gross Amount at which Carried at Close of Period        
Land 5,862,000      
Buildings 39,309,000      
Total 45,171,000      
Accumulated Depreciation $ 9,917,000      
Real Estate Subject to Operating Leases | Retail facilities in the Netherlands | Minimum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 30 years      
Real Estate Subject to Operating Leases | Retail facilities in the Netherlands | Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Specialty facility in Irvine, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 7,626,000      
Buildings 16,137,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 7,626,000      
Buildings 16,137,000      
Total 23,763,000      
Accumulated Depreciation $ 3,373,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Education facility in Windermere, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 5,090,000      
Buildings 34,721,000      
Cost Capitalized Subsequent to Acquisition 15,333,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 5,090,000      
Buildings 50,054,000      
Total 55,144,000      
Accumulated Depreciation $ 12,548,000      
Life on which Depreciation in Latest Statement of  Income is Computed 38 years      
Real Estate Subject to Operating Leases | Industrial facilities in the United States        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 66,845,000      
Buildings 87,575,000      
Cost Capitalized Subsequent to Acquisition 65,400,000      
Increase (Decrease) in Net Investments (56,525,000)      
Gross Amount at which Carried at Close of Period        
Land 49,672,000      
Buildings 113,623,000      
Total 163,295,000      
Accumulated Depreciation 31,830,000      
Real Estate Subject to Operating Leases | Industrial facilities in North Dumfries and Ottawa, Canada        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 17,155,000      
Buildings 10,665,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (18,393,000)      
Gross Amount at which Carried at Close of Period        
Land 5,847,000      
Buildings 3,580,000      
Total 9,427,000      
Accumulated Depreciation $ 1,753,000      
Life on which Depreciation in Latest Statement of  Income is Computed 28 years      
Real Estate Subject to Operating Leases | Education facilities in Coconut Creek, FL and Houston, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 15,550,000      
Buildings 83,862,000      
Cost Capitalized Subsequent to Acquisition 63,830,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 15,550,000      
Buildings 147,692,000      
Total 163,242,000      
Accumulated Depreciation $ 31,111,000      
Real Estate Subject to Operating Leases | Education facilities in Coconut Creek, FL and Houston, TX | Minimum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 37 years      
Real Estate Subject to Operating Leases | Education facilities in Coconut Creek, FL and Houston, TX | Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Office facility in Southfield, MI and warehouse facilities in London, KY and Gallatin, TN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,585,000      
Buildings 17,254,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,585,000      
Buildings 17,254,000      
Total 20,839,000      
Accumulated Depreciation $ 3,495,000      
Real Estate Subject to Operating Leases | Office facility in Southfield, MI and warehouse facilities in London, KY and Gallatin, TN | Minimum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 35 years      
Real Estate Subject to Operating Leases | Office facility in Southfield, MI and warehouse facilities in London, KY and Gallatin, TN | Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 36 years      
Real Estate Subject to Operating Leases | Industrial facilities in Brampton, Toronto, and Vaughan, Canada        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 28,759,000      
Buildings 13,998,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 28,759,000      
Buildings 13,998,000      
Total 42,757,000      
Accumulated Depreciation $ 3,379,000      
Real Estate Subject to Operating Leases | Industrial facilities in Brampton, Toronto, and Vaughan, Canada | Minimum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 28 years      
Real Estate Subject to Operating Leases | Industrial facilities in Brampton, Toronto, and Vaughan, Canada | Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 35 years      
Real Estate Subject to Operating Leases | Industrial facilities in Queretaro and San Juan del Rio, Mexico        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 5,152,000      
Buildings 12,614,000      
Cost Capitalized Subsequent to Acquisition 2,440,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 5,152,000      
Buildings 15,054,000      
Total 20,206,000      
Accumulated Depreciation $ 2,530,000      
Real Estate Subject to Operating Leases | Industrial facilities in Queretaro and San Juan del Rio, Mexico | Minimum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 28 years      
Real Estate Subject to Operating Leases | Industrial facilities in Queretaro and San Juan del Rio, Mexico | Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Chicago, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,222,000      
Buildings 2,655,000      
Cost Capitalized Subsequent to Acquisition 3,511,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,222,000      
Buildings 6,166,000      
Total 8,388,000      
Accumulated Depreciation $ 2,050,000      
Life on which Depreciation in Latest Statement of  Income is Computed 30 years      
Real Estate Subject to Operating Leases | Industrial facility in Zawiercie, Poland        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 395,000      
Buildings 102,000      
Cost Capitalized Subsequent to Acquisition 10,378,000      
Increase (Decrease) in Net Investments (573,000)      
Gross Amount at which Carried at Close of Period        
Land 374,000      
Buildings 9,928,000      
Total 10,302,000      
Accumulated Depreciation $ 1,412,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Radomsko, Poland        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,718,000      
Buildings 59,000      
Cost Capitalized Subsequent to Acquisition 37,496,000      
Increase (Decrease) in Net Investments 731,000      
Gross Amount at which Carried at Close of Period        
Land 1,630,000      
Buildings 38,374,000      
Total 40,004,000      
Accumulated Depreciation $ 2,704,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Sellersburg, IN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,016,000      
Buildings 3,838,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,016,000      
Buildings 3,838,000      
Total 4,854,000      
Accumulated Depreciation $ 781,000      
Life on which Depreciation in Latest Statement of  Income is Computed 36 years      
Real Estate Subject to Operating Leases | Retail and warehouse facilities in Appleton, Madison, and Waukesha, WI        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 5,512,000      
Buildings 61,230,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 5,465,000      
Buildings 61,277,000      
Total 66,742,000      
Accumulated Depreciation $ 10,931,000      
Real Estate Subject to Operating Leases | Retail and warehouse facilities in Appleton, Madison, and Waukesha, WI | Minimum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 36 years      
Real Estate Subject to Operating Leases | Retail and warehouse facilities in Appleton, Madison, and Waukesha, WI | Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facilities in Denmark        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 20,304,000      
Buildings 185,481,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (14,902,000)      
Gross Amount at which Carried at Close of Period        
Land 19,001,000      
Buildings 171,882,000      
Total 190,883,000      
Accumulated Depreciation $ 29,557,000      
Real Estate Subject to Operating Leases | Warehouse facilities in Denmark | Minimum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 25 years      
Real Estate Subject to Operating Leases | Warehouse facilities in Denmark | Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 41 years      
Real Estate Subject to Operating Leases | Retail facilities in the Netherlands        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 38,475,000      
Buildings 117,127,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (7,924,000)      
Gross Amount at which Carried at Close of Period        
Land 36,516,000      
Buildings 111,162,000      
Total 147,678,000      
Accumulated Depreciation $ 21,546,000      
Real Estate Subject to Operating Leases | Retail facilities in the Netherlands | Minimum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 26 years      
Real Estate Subject to Operating Leases | Retail facilities in the Netherlands | Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 30 years      
Real Estate Subject to Operating Leases | Industrial facility in Oostburg, WI        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 786,000      
Buildings 6,589,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 786,000      
Buildings 6,589,000      
Total 7,375,000      
Accumulated Depreciation $ 1,526,000      
Life on which Depreciation in Latest Statement of  Income is Computed 35 years      
Real Estate Subject to Operating Leases | Warehouse facility in Kampen, Netherlands        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,251,000      
Buildings 12,858,000      
Cost Capitalized Subsequent to Acquisition 126,000      
Increase (Decrease) in Net Investments (750,000)      
Gross Amount at which Carried at Close of Period        
Land 3,100,000      
Buildings 12,385,000      
Total 15,485,000      
Accumulated Depreciation $ 2,722,000      
Life on which Depreciation in Latest Statement of  Income is Computed 26 years      
Real Estate Subject to Operating Leases | Warehouse facility in Azambuja, Portugal        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 13,527,000      
Buildings 35,631,000      
Cost Capitalized Subsequent to Acquisition 28,051,000      
Increase (Decrease) in Net Investments (3,988,000)      
Gross Amount at which Carried at Close of Period        
Land 12,912,000      
Buildings 60,309,000      
Total 73,221,000      
Accumulated Depreciation $ 9,122,000      
Life on which Depreciation in Latest Statement of  Income is Computed 28 years      
Real Estate Subject to Operating Leases | Retail facilities in Amsterdam, Moordrecht, and Rotterdam, Netherlands        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,582,000      
Buildings 18,731,000      
Cost Capitalized Subsequent to Acquisition 11,338,000      
Increase (Decrease) in Net Investments (934,000)      
Gross Amount at which Carried at Close of Period        
Land 2,507,000      
Buildings 29,210,000      
Total 31,717,000      
Accumulated Depreciation $ 4,732,000      
Real Estate Subject to Operating Leases | Retail facilities in Amsterdam, Moordrecht, and Rotterdam, Netherlands | Minimum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 27 years      
Real Estate Subject to Operating Leases | Retail facilities in Amsterdam, Moordrecht, and Rotterdam, Netherlands | Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 37 years      
Real Estate Subject to Operating Leases | Warehouse facility in Bad Wünnenberg, Germany        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,916,000      
Buildings 39,687,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (22,500,000)      
Gross Amount at which Carried at Close of Period        
Land 1,266,000      
Buildings 18,837,000      
Total 20,103,000      
Accumulated Depreciation $ 2,542,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Norfolk, NE        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 802,000      
Buildings 3,686,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 802,000      
Buildings 3,686,000      
Total 4,488,000      
Accumulated Depreciation $ 646,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facilities in Phoenix, AZ and Columbia, MD        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 18,286,000      
Buildings 33,030,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 18,286,000      
Buildings 33,030,000      
Total 51,316,000      
Accumulated Depreciation $ 4,532,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facility in Gorzow, Poland        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,736,000      
Buildings 8,298,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (302,000)      
Gross Amount at which Carried at Close of Period        
Land 1,684,000      
Buildings 8,048,000      
Total 9,732,000      
Accumulated Depreciation $ 1,197,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in Sergeant Bluff, IA; Bossier City, LA; and Alvarado, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 6,460,000      
Buildings 49,462,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 6,460,000      
Buildings 49,462,000      
Total 55,922,000      
Accumulated Depreciation $ 7,349,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Glendale Heights, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,237,000      
Buildings 45,484,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 4,237,000      
Buildings 45,484,000      
Total 49,721,000      
Accumulated Depreciation $ 4,195,000      
Life on which Depreciation in Latest Statement of  Income is Computed 38 years      
Real Estate Subject to Operating Leases | Industrial facilities in Mayodan, Sanford, and Stoneville, NC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,505,000      
Buildings 20,913,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,505,000      
Buildings 20,913,000      
Total 24,418,000      
Accumulated Depreciation $ 2,877,000      
Life on which Depreciation in Latest Statement of  Income is Computed 29 years      
Real Estate Subject to Operating Leases | Warehouse facility in Dillon, SC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,424,000      
Buildings 43,114,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,424,000      
Buildings 43,114,000      
Total 46,538,000      
Accumulated Depreciation $ 6,405,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Specialty facility in Birmingham, United Kingdom        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 7,383,000      
Buildings 7,687,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (240,000)      
Gross Amount at which Carried at Close of Period        
Land 7,266,000      
Buildings 7,564,000      
Total 14,830,000      
Accumulated Depreciation $ 1,026,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facilities in Spain        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 17,626,000      
Buildings 44,501,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (1,870,000)      
Gross Amount at which Carried at Close of Period        
Land 17,096,000      
Buildings 43,161,000      
Total 60,257,000      
Accumulated Depreciation $ 6,041,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Gadki, Poland        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,376,000      
Buildings 6,137,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (226,000)      
Gross Amount at which Carried at Close of Period        
Land 1,335,000      
Buildings 5,952,000      
Total 7,287,000      
Accumulated Depreciation $ 841,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Zagreb, Croatia        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 15,789,000      
Buildings 33,287,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (1,478,000)      
Gross Amount at which Carried at Close of Period        
Land 15,313,000      
Buildings 32,285,000      
Total 47,598,000      
Accumulated Depreciation $ 6,632,000      
Life on which Depreciation in Latest Statement of  Income is Computed 26 years      
Real Estate Subject to Operating Leases | Industrial facilities in Middleburg Heights and Union Township, OH        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 3,439,000      
Initial Cost to Company        
Land 1,295,000      
Buildings 13,384,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,295,000      
Buildings 13,384,000      
Total 14,679,000      
Accumulated Depreciation $ 1,820,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facility in Las Vegas, NV        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 0      
Buildings 79,720,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 0      
Buildings 79,720,000      
Total 79,720,000      
Accumulated Depreciation $ 10,319,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in the United States        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 20,517,000      
Buildings 14,135,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 30,060,000      
Gross Amount at which Carried at Close of Period        
Land 22,585,000      
Buildings 42,127,000      
Total 64,712,000      
Accumulated Depreciation $ 4,598,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Bowling Green, KY        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,652,000      
Buildings 51,915,000      
Cost Capitalized Subsequent to Acquisition 72,976,000      
Increase (Decrease) in Net Investments (11,000)      
Gross Amount at which Carried at Close of Period        
Land 2,652,000      
Buildings 124,880,000      
Total 127,532,000      
Accumulated Depreciation $ 10,960,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facilities in the United Kingdom        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 6,791,000      
Buildings 2,315,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (145,000)      
Gross Amount at which Carried at Close of Period        
Land 6,683,000      
Buildings 2,278,000      
Total 8,961,000      
Accumulated Depreciation $ 346,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Evansville, IN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 180,000      
Buildings 22,095,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 180,000      
Buildings 22,095,000      
Total 22,275,000      
Accumulated Depreciation $ 2,929,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Elorrio, Spain        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 7,858,000      
Buildings 12,728,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (619,000)      
Gross Amount at which Carried at Close of Period        
Land 7,622,000      
Buildings 12,345,000      
Total 19,967,000      
Accumulated Depreciation $ 1,931,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial and office facilities in Elberton, GA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 879,000      
Buildings 2,014,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 879,000      
Buildings 2,014,000      
Total 2,893,000      
Accumulated Depreciation $ 375,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facilities in Dugo Selo, Kutina, Samobor, Spansko, and Zagreb, Croatia        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 5,549,000      
Buildings 12,408,000      
Cost Capitalized Subsequent to Acquisition 1,691,000      
Increase (Decrease) in Net Investments 5,937,000      
Gross Amount at which Carried at Close of Period        
Land 6,602,000      
Buildings 18,983,000      
Total 25,585,000      
Accumulated Depreciation $ 3,711,000      
Life on which Depreciation in Latest Statement of  Income is Computed 26 years      
Real Estate Subject to Operating Leases | Office and warehouse facilities in the United States        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 42,793,000      
Buildings 193,666,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 42,793,000      
Buildings 193,666,000      
Total 236,459,000      
Accumulated Depreciation $ 27,795,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facilities in Breda, Elst, Gieten, Raalte, and Woerden, Netherlands        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 37,755,000      
Buildings 91,666,000      
Cost Capitalized Subsequent to Acquisition 4,787,000      
Increase (Decrease) in Net Investments (3,872,000)      
Gross Amount at which Carried at Close of Period        
Land 36,619,000      
Buildings 93,717,000      
Total 130,336,000      
Accumulated Depreciation $ 12,321,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facilities in Oxnard and Watsonville, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 22,453,000      
Buildings 78,814,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 22,453,000      
Buildings 78,814,000      
Total 101,267,000      
Accumulated Depreciation $ 10,781,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facilities in Italy        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 75,492,000      
Buildings 138,280,000      
Cost Capitalized Subsequent to Acquisition 7,242,000      
Increase (Decrease) in Net Investments (7,124,000)      
Gross Amount at which Carried at Close of Period        
Land 73,219,000      
Buildings 140,671,000      
Total 213,890,000      
Accumulated Depreciation $ 20,168,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Land in Hudson, NY        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,405,000      
Buildings 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,405,000      
Buildings 0      
Total 2,405,000      
Accumulated Depreciation 0      
Real Estate Subject to Operating Leases | Land in Chicago, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 9,887,000      
Buildings 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 9,887,000      
Buildings 0      
Total 9,887,000      
Accumulated Depreciation 0      
Real Estate Subject to Operating Leases | Industrial facility in Fraser, MI        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 1,346,000      
Buildings 9,551,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,346,000      
Buildings 9,551,000      
Total 10,897,000      
Accumulated Depreciation $ 1,345,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Net-lease self-storage facilities in the United States        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 19,583,000      
Buildings 108,971,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 19,583,000      
Buildings 108,971,000      
Total 128,554,000      
Accumulated Depreciation $ 15,973,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Middleburg Heights, OH        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 542,000      
Buildings 2,507,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 542,000      
Buildings 2,507,000      
Total 3,049,000      
Accumulated Depreciation $ 341,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Net-lease self-storage facility in Fort Worth, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 691,000      
Buildings 6,295,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 691,000      
Buildings 6,295,000      
Total 6,986,000      
Accumulated Depreciation $ 944,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facilities in Delnice, Pozega, and Sesvete, Croatia        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 5,519,000      
Buildings 9,930,000      
Cost Capitalized Subsequent to Acquisition 1,403,000      
Increase (Decrease) in Net Investments (651,000)      
Gross Amount at which Carried at Close of Period        
Land 5,353,000      
Buildings 10,848,000      
Total 16,201,000      
Accumulated Depreciation $ 2,211,000      
Life on which Depreciation in Latest Statement of  Income is Computed 27 years      
Real Estate Subject to Operating Leases | Retail facility in Orlando, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 6,262,000      
Buildings 25,134,000      
Cost Capitalized Subsequent to Acquisition 430,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 6,371,000      
Buildings 25,455,000      
Total 31,826,000      
Accumulated Depreciation $ 3,338,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Avon, OH        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,447,000      
Buildings 5,564,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,447,000      
Buildings 5,564,000      
Total 7,011,000      
Accumulated Depreciation $ 821,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Chimelow, Poland        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 6,158,000      
Buildings 28,032,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (1,029,000)      
Gross Amount at which Carried at Close of Period        
Land 5,973,000      
Buildings 27,188,000      
Total 33,161,000      
Accumulated Depreciation $ 3,853,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Net-lease self-storage facility in Fayetteville, NC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,839,000      
Buildings 4,654,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,839,000      
Buildings 4,654,000      
Total 6,493,000      
Accumulated Depreciation $ 890,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facilities in the United States        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 19,529,000      
Buildings 42,318,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (7,938,000)      
Gross Amount at which Carried at Close of Period        
Land 17,297,000      
Buildings 36,612,000      
Total 53,909,000      
Accumulated Depreciation $ 5,267,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Education facilities in Montgomery, AL and Savannah, GA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 5,508,000      
Buildings 12,032,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 5,508,000      
Buildings 12,032,000      
Total 17,540,000      
Accumulated Depreciation $ 1,705,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Office facilities in St. Louis, MO        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,297,000      
Buildings 5,362,000      
Cost Capitalized Subsequent to Acquisition 7,951,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,836,000      
Buildings 12,774,000      
Total 14,610,000      
Accumulated Depreciation $ 2,049,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Zary, Poland        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,062,000      
Buildings 10,034,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (365,000)      
Gross Amount at which Carried at Close of Period        
Land 2,000,000      
Buildings 9,731,000      
Total 11,731,000      
Accumulated Depreciation $ 1,414,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in San Antonio, TX and Sterling, VA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,198,000      
Buildings 23,981,000      
Cost Capitalized Subsequent to Acquisition 78,728,000      
Increase (Decrease) in Net Investments (462,000)      
Gross Amount at which Carried at Close of Period        
Land 6,767,000      
Buildings 98,678,000      
Total 105,445,000      
Accumulated Depreciation $ 9,761,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Elk Grove Village, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 5,511,000      
Buildings 10,766,000      
Cost Capitalized Subsequent to Acquisition 2,413,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 5,511,000      
Buildings 13,179,000      
Total 18,690,000      
Accumulated Depreciation $ 1,491,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Portage, WI        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 3,693,000      
Initial Cost to Company        
Land 3,450,000      
Buildings 7,797,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,450,000      
Buildings 7,797,000      
Total 11,247,000      
Accumulated Depreciation $ 1,218,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Saitama Prefecture, Japan        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 13,507,000      
Buildings 25,301,000      
Cost Capitalized Subsequent to Acquisition 6,639,000      
Increase (Decrease) in Net Investments (13,574,000)      
Gross Amount at which Carried at Close of Period        
Land 10,286,000      
Buildings 21,587,000      
Total 31,873,000      
Accumulated Depreciation $ 2,828,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facility in Dallas, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,977,000      
Buildings 16,168,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,977,000      
Buildings 16,168,000      
Total 19,145,000      
Accumulated Depreciation $ 2,148,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facilities in Croatia        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 9,000,000      
Buildings 13,002,000      
Cost Capitalized Subsequent to Acquisition 1,415,000      
Increase (Decrease) in Net Investments (5,178,000)      
Gross Amount at which Carried at Close of Period        
Land 7,568,000      
Buildings 10,671,000      
Total 18,239,000      
Accumulated Depreciation $ 1,932,000      
Real Estate Subject to Operating Leases | Retail facilities in Croatia | Minimum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 29 years      
Real Estate Subject to Operating Leases | Retail facilities in Croatia | Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 37 years      
Real Estate Subject to Operating Leases | Retail facility in Northbrook, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 0      
Buildings 493,000      
Cost Capitalized Subsequent to Acquisition 447,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 0      
Buildings 940,000      
Total 940,000      
Accumulated Depreciation $ 291,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Education facility in Chicago, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 18,510,000      
Buildings 163,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (16,859,000)      
Gross Amount at which Carried at Close of Period        
Land 1,793,000      
Buildings 21,000      
Total 1,814,000      
Accumulated Depreciation $ 13,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Dillon, SC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,516,000      
Buildings 44,933,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,516,000      
Buildings 44,933,000      
Total 48,449,000      
Accumulated Depreciation $ 6,625,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Net-lease self-storage facilities in New York City, NY        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 29,223,000      
Buildings 77,202,000      
Cost Capitalized Subsequent to Acquisition 714,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 29,223,000      
Buildings 77,916,000      
Total 107,139,000      
Accumulated Depreciation $ 10,156,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Net-lease self-storage facility in Hilo, HI        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 769,000      
Buildings 12,869,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 769,000      
Buildings 12,869,000      
Total 13,638,000      
Accumulated Depreciation $ 1,687,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Net-lease self-storage facility in Clearwater, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,247,000      
Buildings 5,733,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,247,000      
Buildings 5,733,000      
Total 6,980,000      
Accumulated Depreciation $ 856,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facilities in Gadki, Poland        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 10,422,000      
Buildings 47,727,000      
Cost Capitalized Subsequent to Acquisition 57,000      
Increase (Decrease) in Net Investments (1,751,000)      
Gross Amount at which Carried at Close of Period        
Land 10,108,000      
Buildings 46,347,000      
Total 56,455,000      
Accumulated Depreciation $ 6,662,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Net-lease self-storage facility in Orlando, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,070,000      
Buildings 8,686,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,070,000      
Buildings 8,686,000      
Total 9,756,000      
Accumulated Depreciation $ 1,222,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facility in Lewisville, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,485,000      
Buildings 11,263,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,485,000      
Buildings 11,263,000      
Total 14,748,000      
Accumulated Depreciation $ 1,558,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Research and development facility in Wageningen, Netherlands        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 5,227,000      
Buildings 18,793,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (447,000)      
Gross Amount at which Carried at Close of Period        
Land 5,070,000      
Buildings 18,503,000      
Total 23,573,000      
Accumulated Depreciation $ 2,620,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Net-lease self-storage facility in Palm Coast, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,994,000      
Buildings 4,982,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,994,000      
Buildings 4,982,000      
Total 6,976,000      
Accumulated Depreciation $ 871,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Net-lease self-storage facility in Holiday, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,730,000      
Buildings 4,213,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,730,000      
Buildings 4,213,000      
Total 5,943,000      
Accumulated Depreciation $ 719,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Research and development facility in Drunen, Netherlands        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,316,000      
Buildings 9,370,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (351,000)      
Gross Amount at which Carried at Close of Period        
Land 2,247,000      
Buildings 9,088,000      
Total 11,335,000      
Accumulated Depreciation $ 1,253,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility New Concord, OH        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 1,189,000      
Initial Cost to Company        
Land 958,000      
Buildings 2,309,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 958,000      
Buildings 2,309,000      
Total 3,267,000      
Accumulated Depreciation $ 388,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facility in Gelsenkirchen, Germany        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,178,000      
Buildings 17,097,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (580,000)      
Gross Amount at which Carried at Close of Period        
Land 2,112,000      
Buildings 16,583,000      
Total 18,695,000      
Accumulated Depreciation $ 2,280,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facilities in Mszczonow and Tomaszow Mazowiecki, Poland        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 8,782,000      
Buildings 53,575,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (1,877,000)      
Gross Amount at which Carried at Close of Period        
Land 8,518,000      
Buildings 51,962,000      
Total 60,480,000      
Accumulated Depreciation $ 7,740,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Sered, Slovakia        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,428,000      
Buildings 28,005,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (946,000)      
Gross Amount at which Carried at Close of Period        
Land 3,325,000      
Buildings 27,162,000      
Total 30,487,000      
Accumulated Depreciation $ 3,771,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Tuchomerice, Czech Republic        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 7,864,000      
Buildings 27,006,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (1,050,000)      
Gross Amount at which Carried at Close of Period        
Land 7,627,000      
Buildings 26,193,000      
Total 33,820,000      
Accumulated Depreciation $ 3,589,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Office facility in Warsaw, Poland        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 29,901,000      
Initial Cost to Company        
Land 0      
Buildings 44,990,000      
Cost Capitalized Subsequent to Acquisition 42,000      
Increase (Decrease) in Net Investments (15,734,000)      
Gross Amount at which Carried at Close of Period        
Land 0      
Buildings 29,298,000      
Total 29,298,000      
Accumulated Depreciation $ 5,833,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Kaunas, Lithuania        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 35,382,000      
Initial Cost to Company        
Land 10,199,000      
Buildings 47,391,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (1,734,000)      
Gross Amount at which Carried at Close of Period        
Land 9,892,000      
Buildings 45,964,000      
Total 55,856,000      
Accumulated Depreciation $ 6,451,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Specialty facility in Jacksonville, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 11,429,000      
Initial Cost to Company        
Land 906,000      
Buildings 17,020,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 906,000      
Buildings 17,020,000      
Total 17,926,000      
Accumulated Depreciation $ 2,275,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facilities in Houston, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 791,000      
Buildings 1,990,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 791,000      
Buildings 1,990,000      
Total 2,781,000      
Accumulated Depreciation $ 291,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facilities in Shelbyville, IN; Kalamazoo, MI; Tiffin, OH; Andersonville, TN; and Millwood, WV        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,868,000      
Buildings 37,571,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,868,000      
Buildings 37,571,000      
Total 40,439,000      
Accumulated Depreciation $ 5,613,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Perrysburg, OH        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 806,000      
Buildings 11,922,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 806,000      
Buildings 11,922,000      
Total 12,728,000      
Accumulated Depreciation $ 1,839,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Dillon, SC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 620,000      
Buildings 46,319,000      
Cost Capitalized Subsequent to Acquisition 434,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 620,000      
Buildings 46,753,000      
Total 47,373,000      
Accumulated Depreciation $ 5,591,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Zabia Wola, Poland        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 14,476,000      
Initial Cost to Company        
Land 4,742,000      
Buildings 23,270,000      
Cost Capitalized Subsequent to Acquisition 5,636,000      
Increase (Decrease) in Net Investments (983,000)      
Gross Amount at which Carried at Close of Period        
Land 4,599,000      
Buildings 28,066,000      
Total 32,665,000      
Accumulated Depreciation $ 3,831,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Laboratory facility in Buffalo Grove, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,224,000      
Buildings 6,583,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,224,000      
Buildings 6,583,000      
Total 8,807,000      
Accumulated Depreciation $ 929,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facilities in McHenry, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 5,794,000      
Buildings 21,141,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 5,794,000      
Buildings 21,141,000      
Total 26,935,000      
Accumulated Depreciation $ 4,412,000      
Real Estate Subject to Operating Leases | Warehouse facilities in McHenry, IL | Minimum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 27 years      
Real Estate Subject to Operating Leases | Warehouse facilities in McHenry, IL | Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 28 years      
Real Estate Subject to Operating Leases | Industrial facilities in Chicago, Cortland, Forest View, Morton Grove, and Northbrook, IL and Madison and Monona, WI        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 23,267,000      
Buildings 9,166,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 23,267,000      
Buildings 9,166,000      
Total 32,433,000      
Accumulated Depreciation $ 1,826,000      
Real Estate Subject to Operating Leases | Industrial facilities in Chicago, Cortland, Forest View, Morton Grove, and Northbrook, IL and Madison and Monona, WI | Minimum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 35 years      
Real Estate Subject to Operating Leases | Industrial facilities in Chicago, Cortland, Forest View, Morton Grove, and Northbrook, IL and Madison and Monona, WI | Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Kilgore, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,002,000      
Buildings 36,334,000      
Cost Capitalized Subsequent to Acquisition 14,096,000      
Increase (Decrease) in Net Investments (6,000)      
Gross Amount at which Carried at Close of Period        
Land 3,002,000      
Buildings 50,424,000      
Total 53,426,000      
Accumulated Depreciation $ 6,885,000      
Life on which Depreciation in Latest Statement of  Income is Computed 37 years      
Real Estate Subject to Operating Leases | Industrial facility in San Luis Potosi, Mexico        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,787,000      
Buildings 12,945,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,787,000      
Buildings 12,945,000      
Total 15,732,000      
Accumulated Depreciation $ 1,906,000      
Life on which Depreciation in Latest Statement of  Income is Computed 39 years      
Real Estate Subject to Operating Leases | Industrial facility in Legnica, Poland        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 995,000      
Buildings 9,787,000      
Cost Capitalized Subsequent to Acquisition 6,007,000      
Increase (Decrease) in Net Investments (523,000)      
Gross Amount at which Carried at Close of Period        
Land 963,000      
Buildings 15,303,000      
Total 16,266,000      
Accumulated Depreciation $ 2,495,000      
Life on which Depreciation in Latest Statement of  Income is Computed 29 years      
Real Estate Subject to Operating Leases | Industrial facility in Meru, France        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,231,000      
Buildings 14,731,000      
Cost Capitalized Subsequent to Acquisition 8,000      
Increase (Decrease) in Net Investments (545,000)      
Gross Amount at which Carried at Close of Period        
Land 4,109,000      
Buildings 14,316,000      
Total 18,425,000      
Accumulated Depreciation $ 2,709,000      
Life on which Depreciation in Latest Statement of  Income is Computed 29 years      
Real Estate Subject to Operating Leases | Education facility in Portland, OR        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,396,000      
Buildings 23,258,000      
Cost Capitalized Subsequent to Acquisition 4,177,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,396,000      
Buildings 27,435,000      
Total 29,831,000      
Accumulated Depreciation $ 4,276,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Inwood, WV        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,265,000      
Buildings 36,692,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,265,000      
Buildings 36,692,000      
Total 39,957,000      
Accumulated Depreciation $ 4,830,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Hurricane, UT        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,914,000      
Buildings 37,279,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,914,000      
Buildings 37,279,000      
Total 39,193,000      
Accumulated Depreciation $ 4,642,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Bensenville, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 8,640,000      
Buildings 4,948,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 300,000      
Gross Amount at which Carried at Close of Period        
Land 8,940,000      
Buildings 4,948,000      
Total 13,888,000      
Accumulated Depreciation $ 990,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Katowice, Poland        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 0      
Buildings 764,000      
Cost Capitalized Subsequent to Acquisition 15,163,000      
Increase (Decrease) in Net Investments 72,000      
Gross Amount at which Carried at Close of Period        
Land 0      
Buildings 15,999,000      
Total 15,999,000      
Accumulated Depreciation $ 1,638,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in Westerville, OH and North Wales, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,545,000      
Buildings 6,508,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,545,000      
Buildings 6,508,000      
Total 8,053,000      
Accumulated Depreciation $ 999,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in Fargo, ND; Norristown, PA; and Atlanta, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,616,000      
Buildings 5,589,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,616,000      
Buildings 5,589,000      
Total 7,205,000      
Accumulated Depreciation $ 1,004,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in Chihuahua and Juarez, Mexico        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,426,000      
Buildings 7,286,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,426,000      
Buildings 7,286,000      
Total 10,712,000      
Accumulated Depreciation $ 1,233,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Statesville, NC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,683,000      
Buildings 13,827,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,683,000      
Buildings 13,827,000      
Total 15,510,000      
Accumulated Depreciation $ 1,906,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in Searcy, AR and Conestoga, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,290,000      
Buildings 51,410,000      
Cost Capitalized Subsequent to Acquisition 21,027,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 4,678,000      
Buildings 72,049,000      
Total 76,727,000      
Accumulated Depreciation $ 9,039,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in Hartford and Milwaukee, WI        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,471,000      
Buildings 21,293,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,471,000      
Buildings 21,293,000      
Total 22,764,000      
Accumulated Depreciation $ 2,841,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in Brockville and Prescott, Canada        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,025,000      
Buildings 9,519,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,025,000      
Buildings 9,519,000      
Total 11,544,000      
Accumulated Depreciation $ 1,278,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Dordrecht, Netherlands        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,233,000      
Buildings 10,954,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 72,000      
Gross Amount at which Carried at Close of Period        
Land 3,253,000      
Buildings 11,006,000      
Total 14,259,000      
Accumulated Depreciation $ 1,204,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in York, PA and Lexington, SC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,155,000      
Buildings 22,930,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 4,155,000      
Buildings 22,930,000      
Total 27,085,000      
Accumulated Depreciation $ 3,401,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Queretaro, Mexico        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,851,000      
Buildings 12,748,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (3,000)      
Gross Amount at which Carried at Close of Period        
Land 2,851,000      
Buildings 12,745,000      
Total 15,596,000      
Accumulated Depreciation $ 1,707,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in Houston, TX and Metairie, LA and office facilities in Houston, TX and Mason, OH        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 6,130,000      
Buildings 24,981,000      
Cost Capitalized Subsequent to Acquisition 2,145,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 6,130,000      
Buildings 27,126,000      
Total 33,256,000      
Accumulated Depreciation $ 3,240,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Pardubice, Czech Republic        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,694,000      
Buildings 8,793,000      
Cost Capitalized Subsequent to Acquisition 436,000      
Increase (Decrease) in Net Investments 3,000      
Gross Amount at which Carried at Close of Period        
Land 1,698,000      
Buildings 9,228,000      
Total 10,926,000      
Accumulated Depreciation $ 1,016,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facilities in Brabrand, Denmark and Arlandastad, Sweden        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 6,499,000      
Buildings 27,899,000      
Cost Capitalized Subsequent to Acquisition 147,000      
Increase (Decrease) in Net Investments (492,000)      
Gross Amount at which Carried at Close of Period        
Land 6,362,000      
Buildings 27,691,000      
Total 34,053,000      
Accumulated Depreciation $ 3,153,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facility in Hamburg, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,520,000      
Buildings 34,167,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 4,520,000      
Buildings 34,167,000      
Total 38,687,000      
Accumulated Depreciation $ 3,992,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Charlotte, NC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 6,481,000      
Buildings 82,936,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 6,481,000      
Buildings 82,936,000      
Total 89,417,000      
Accumulated Depreciation $ 9,475,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Buffalo Grove, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,287,000      
Buildings 10,167,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,287,000      
Buildings 10,167,000      
Total 13,454,000      
Accumulated Depreciation $ 1,295,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Hvidovre, Denmark        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,931,000      
Buildings 4,243,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (53,000)      
Gross Amount at which Carried at Close of Period        
Land 1,923,000      
Buildings 4,198,000      
Total 6,121,000      
Accumulated Depreciation $ 601,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Huddersfield, United Kingdom        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 8,659,000      
Buildings 29,752,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (1,423,000)      
Gross Amount at which Carried at Close of Period        
Land 8,338,000      
Buildings 28,650,000      
Total 36,988,000      
Accumulated Depreciation $ 3,038,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Newark, United Kingdom        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 21,869,000      
Buildings 74,777,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (3,098,000)      
Gross Amount at which Carried at Close of Period        
Land 21,168,000      
Buildings 72,380,000      
Total 93,548,000      
Accumulated Depreciation $ 7,213,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Langen, Germany        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 14,160,000      
Buildings 7,694,000      
Cost Capitalized Subsequent to Acquisition 32,169,000      
Increase (Decrease) in Net Investments (4,271,000)      
Gross Amount at which Carried at Close of Period        
Land 12,909,000      
Buildings 36,843,000      
Total 49,752,000      
Accumulated Depreciation $ 2,677,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Aurora, OR        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,914,000      
Buildings 21,459,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (5,000,000)      
Gross Amount at which Carried at Close of Period        
Land 2,914,000      
Buildings 16,459,000      
Total 19,373,000      
Accumulated Depreciation $ 1,620,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Vojens, Denmark        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,031,000      
Buildings 8,784,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 24,000      
Gross Amount at which Carried at Close of Period        
Land 1,033,000      
Buildings 8,806,000      
Total 9,839,000      
Accumulated Depreciation $ 863,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Office facility in Kitzingen, Germany        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,812,000      
Buildings 41,125,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (1,631,000)      
Gross Amount at which Carried at Close of Period        
Land 4,642,000      
Buildings 39,664,000      
Total 44,306,000      
Accumulated Depreciation $ 3,782,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Knoxville, TN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,455,000      
Buildings 47,446,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,455,000      
Buildings 47,446,000      
Total 49,901,000      
Accumulated Depreciation $ 4,174,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in Bluffton and Plymouth, IN; and Lawrence, KS        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 674,000      
Buildings 33,519,000      
Cost Capitalized Subsequent to Acquisition 20,542,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,064,000      
Buildings 53,671,000      
Total 54,735,000      
Accumulated Depreciation $ 3,782,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Huntley, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 5,260,000      
Buildings 26,617,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 5,260,000      
Buildings 26,617,000      
Total 31,877,000      
Accumulated Depreciation $ 2,165,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in Winter Haven, FL; Belvedere, IL; and Fayetteville, NC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 8,232,000      
Buildings 31,745,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 8,232,000      
Buildings 31,745,000      
Total 39,977,000      
Accumulated Depreciation $ 2,557,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facilities in Spain        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 34,216,000      
Buildings 57,151,000      
Cost Capitalized Subsequent to Acquisition 239,000      
Increase (Decrease) in Net Investments (5,061,000)      
Gross Amount at which Carried at Close of Period        
Land 32,321,000      
Buildings 54,224,000      
Total 86,545,000      
Accumulated Depreciation $ 4,300,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Little Canada, MN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,384,000      
Buildings 23,422,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,384,000      
Buildings 23,422,000      
Total 26,806,000      
Accumulated Depreciation $ 1,857,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Hurricane, UT        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 5,154,000      
Buildings 22,893,000      
Cost Capitalized Subsequent to Acquisition 20,517,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 5,154,000      
Buildings 43,410,000      
Total 48,564,000      
Accumulated Depreciation $ 2,688,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in Bethlehem, PA and Waco, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,673,000      
Buildings 19,111,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 4,673,000      
Buildings 19,111,000      
Total 23,784,000      
Accumulated Depreciation $ 1,462,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in Pleasanton, KS; Savage, MN; Grove City, OH; and Mahanoy City, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 7,717,000      
Buildings 21,569,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 7,717,000      
Buildings 21,569,000      
Total 29,286,000      
Accumulated Depreciation $ 1,618,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Specialty facilities in Fort Washington, Huntington Valley, and West Chester, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 0      
Buildings 492,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 0      
Buildings 492,000      
Total 492,000      
Accumulated Depreciation $ 36,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facilities in Grove City, OH and Anderson, SC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,415,000      
Buildings 15,151,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,415,000      
Buildings 15,151,000      
Total 16,566,000      
Accumulated Depreciation $ 1,103,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Office and retail facilities in NJ and PA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 17,537,000      
Buildings 25,987,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 17,537,000      
Buildings 25,987,000      
Total 43,524,000      
Accumulated Depreciation $ 1,876,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Land and warehouse facilities in CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 8,513,000      
Buildings 45,669,000      
Cost Capitalized Subsequent to Acquisition 6,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 8,516,000      
Buildings 45,672,000      
Total 54,188,000      
Accumulated Depreciation $ 3,300,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Research and development facility in Wageningen, Netherlands        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,429,000      
Buildings 5,777,000      
Cost Capitalized Subsequent to Acquisition 18,658,000      
Increase (Decrease) in Net Investments 2,223,000      
Gross Amount at which Carried at Close of Period        
Land 1,548,000      
Buildings 26,539,000      
Total 28,087,000      
Accumulated Depreciation $ 987,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facilities in France        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 15,954,000      
Buildings 104,578,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (7,141,000)      
Gross Amount at which Carried at Close of Period        
Land 15,009,000      
Buildings 98,382,000      
Total 113,391,000      
Accumulated Depreciation $ 6,772,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Detroit, MI        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,625,000      
Buildings 47,743,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,625,000      
Buildings 47,743,000      
Total 51,368,000      
Accumulated Depreciation $ 3,201,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Solihull, United Kingdom        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 42,137,000      
Buildings 123,315,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (13,601,000)      
Gross Amount at which Carried at Close of Period        
Land 38,673,000      
Buildings 113,178,000      
Total 151,851,000      
Accumulated Depreciation $ 7,535,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Specialty facility in New Rochelle, NY        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,617,000      
Buildings 21,590,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,617,000      
Buildings 21,590,000      
Total 25,207,000      
Accumulated Depreciation $ 1,436,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Groveport, OH        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 0      
Buildings 26,639,000      
Cost Capitalized Subsequent to Acquisition 2,904,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 0      
Buildings 29,543,000      
Total 29,543,000      
Accumulated Depreciation $ 1,905,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Dakota, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,970,000      
Buildings 50,369,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,970,000      
Buildings 50,369,000      
Total 52,339,000      
Accumulated Depreciation $ 3,326,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in San Jose, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 12,808,000      
Buildings 31,714,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 12,808,000      
Buildings 31,714,000      
Total 44,522,000      
Accumulated Depreciation $ 2,092,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Opelika, AL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,115,000      
Buildings 39,980,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,115,000      
Buildings 39,980,000      
Total 42,095,000      
Accumulated Depreciation $ 2,569,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facilities in Elk Grove Village and Niles, IL; and Guelph, Canada        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 12,932,000      
Buildings 25,096,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 12,932,000      
Buildings 25,096,000      
Total 38,028,000      
Accumulated Depreciation $ 1,609,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Rome, NY        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,480,000      
Buildings 47,781,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,480,000      
Buildings 47,781,000      
Total 49,261,000      
Accumulated Depreciation $ 3,060,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Frankfort, IN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 5,423,000      
Buildings 95,915,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 5,423,000      
Buildings 95,915,000      
Total 101,338,000      
Accumulated Depreciation $ 5,637,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Rogers, MN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,871,000      
Buildings 20,959,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,871,000      
Buildings 20,959,000      
Total 22,830,000      
Accumulated Depreciation $ 1,212,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in Chattanooga, TN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,859,000      
Buildings 29,302,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 4,859,000      
Buildings 29,302,000      
Total 34,161,000      
Accumulated Depreciation $ 1,614,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Mankato, MN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,979,000      
Buildings 11,619,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,979,000      
Buildings 11,619,000      
Total 14,598,000      
Accumulated Depreciation $ 621,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facilities in Denmark        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,695,000      
Buildings 38,428,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (843,000)      
Gross Amount at which Carried at Close of Period        
Land 2,639,000      
Buildings 37,641,000      
Total 40,280,000      
Accumulated Depreciation $ 1,947,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facilities in Poland        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 15,110,000      
Buildings 47,511,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (1,178,000)      
Gross Amount at which Carried at Close of Period        
Land 14,826,000      
Buildings 46,617,000      
Total 61,443,000      
Accumulated Depreciation $ 2,385,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Cary, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,568,000      
Buildings 31,977,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 4,568,000      
Buildings 31,977,000      
Total 36,545,000      
Accumulated Depreciation $ 1,608,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facilities in the Netherlands        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 9,342,000      
Buildings 32,770,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (942,000)      
Gross Amount at which Carried at Close of Period        
Land 9,133,000      
Buildings 32,037,000      
Total 41,170,000      
Accumulated Depreciation $ 1,608,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Specialty facilities in Flemington and Pennsauken, NJ        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,025,000      
Buildings 397,000      
Cost Capitalized Subsequent to Acquisition 832,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,025,000      
Buildings 1,229,000      
Total 2,254,000      
Accumulated Depreciation $ 49,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Pleasant Prairie, WI        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,443,000      
Buildings 16,532,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,443,000      
Buildings 16,532,000      
Total 17,975,000      
Accumulated Depreciation $ 816,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Specialty facilities in Spain        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 26,735,000      
Buildings 99,822,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (2,647,000)      
Gross Amount at which Carried at Close of Period        
Land 26,176,000      
Buildings 97,734,000      
Total 123,910,000      
Accumulated Depreciation $ 4,666,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facilities in Denmark        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,295,000      
Buildings 35,898,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (206,000)      
Gross Amount at which Carried at Close of Period        
Land 3,260,000      
Buildings 35,727,000      
Total 38,987,000      
Accumulated Depreciation $ 1,539,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Laval, Canada        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,014,000      
Buildings 16,037,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (828,000)      
Gross Amount at which Carried at Close of Period        
Land 3,848,000      
Buildings 15,375,000      
Total 19,223,000      
Accumulated Depreciation $ 718,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Chattanooga, TN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 5,063,000      
Buildings 36,645,000      
Cost Capitalized Subsequent to Acquisition 26,128,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 5,063,000      
Buildings 62,773,000      
Total 67,836,000      
Accumulated Depreciation $ 1,677,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Coatzacoalcos, Mexico        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 9,805,000      
Buildings 17,622,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 9,805,000      
Buildings 17,622,000      
Total 27,427,000      
Accumulated Depreciation $ 741,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Lowbanks, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,574,000      
Buildings 1,605,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,574,000      
Buildings 1,605,000      
Total 5,179,000      
Accumulated Depreciation $ 67,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in Chicago, IL; Geismar, LA; and Nashville, TN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 9,300,000      
Buildings 26,945,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 9,300,000      
Buildings 26,945,000      
Total 36,245,000      
Accumulated Depreciation $ 1,111,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial and warehouse facilities in the United States        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 9,847,000      
Buildings 88,227,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 9,847,000      
Buildings 88,227,000      
Total 98,074,000      
Accumulated Depreciation $ 3,596,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facilities in Denmark        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,228,000      
Buildings 31,774,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 1,406,000      
Gross Amount at which Carried at Close of Period        
Land 2,322,000      
Buildings 33,086,000      
Total 35,408,000      
Accumulated Depreciation $ 1,285,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Medina, OH        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,029,000      
Buildings 22,938,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,029,000      
Buildings 22,938,000      
Total 24,967,000      
Accumulated Depreciation $ 885,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Bree, Belgium        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 0      
Buildings 73,302,000      
Cost Capitalized Subsequent to Acquisition 42,000      
Increase (Decrease) in Net Investments 4,684,000      
Gross Amount at which Carried at Close of Period        
Land 0      
Buildings 78,028,000      
Total 78,028,000      
Accumulated Depreciation $ 2,939,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facilities in Spain        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,906,000      
Buildings 12,825,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 1,479,000      
Gross Amount at which Carried at Close of Period        
Land 5,315,000      
Buildings 13,895,000      
Total 19,210,000      
Accumulated Depreciation $ 503,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial and warehouse facilities in the United States        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 27,543,000      
Buildings 192,197,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 27,543,000      
Buildings 192,197,000      
Total 219,740,000      
Accumulated Depreciation $ 6,898,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facilities in Denmark        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,690,000      
Buildings 33,703,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 2,584,000      
Gross Amount at which Carried at Close of Period        
Land 2,883,000      
Buildings 36,094,000      
Total 38,977,000      
Accumulated Depreciation $ 1,209,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Office facility in Austin, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 31,095,000      
Buildings 45,393,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 31,095,000      
Buildings 45,393,000      
Total 76,488,000      
Accumulated Depreciation $ 1,611,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Land in Chicago, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 1,849,000      
Initial Cost to Company        
Land 3,873,000      
Buildings 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,873,000      
Buildings 0      
Total 3,873,000      
Accumulated Depreciation 0      
Real Estate Subject to Operating Leases | Retail facilities in Croatia        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 1,367,000      
Buildings 23,337,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 1,973,000      
Gross Amount at which Carried at Close of Period        
Land 1,476,000      
Buildings 25,201,000      
Total 26,677,000      
Accumulated Depreciation $ 894,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse in Streetsboro, OH        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 2,474,000      
Initial Cost to Company        
Land 2,435,000      
Buildings 9,333,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,435,000      
Buildings 9,333,000      
Total 11,768,000      
Accumulated Depreciation $ 331,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse in University Park, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 47,216,000      
Initial Cost to Company        
Land 15,377,000      
Buildings 63,299,000      
Cost Capitalized Subsequent to Acquisition 3,290,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 15,377,000      
Buildings 66,589,000      
Total 81,966,000      
Accumulated Depreciation $ 2,246,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in Surprise, AZ; Temple, GA; and Houston, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 9,390,000      
Initial Cost to Company        
Land 2,994,000      
Buildings 26,100,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,994,000      
Buildings 26,100,000      
Total 29,094,000      
Accumulated Depreciation $ 926,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Jonesville, SC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 25,441,000      
Initial Cost to Company        
Land 2,895,000      
Buildings 32,152,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,895,000      
Buildings 32,152,000      
Total 35,047,000      
Accumulated Depreciation $ 1,141,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Albany, GA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 5,174,000      
Initial Cost to Company        
Land 3,108,000      
Buildings 12,220,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,108,000      
Buildings 12,220,000      
Total 15,328,000      
Accumulated Depreciation $ 434,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in Dallas/Forth Worth, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 4,241,000      
Initial Cost to Company        
Land 3,918,000      
Buildings 9,817,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,918,000      
Buildings 9,817,000      
Total 13,735,000      
Accumulated Depreciation $ 348,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Byron Center, MI        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 6,366,000      
Initial Cost to Company        
Land 1,925,000      
Buildings 10,098,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,925,000      
Buildings 10,098,000      
Total 12,023,000      
Accumulated Depreciation $ 358,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Net-lease hotel in Albion, Mauritius        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 8,363,000      
Initial Cost to Company        
Land 7,633,000      
Buildings 29,274,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 2,947,000      
Gross Amount at which Carried at Close of Period        
Land 8,243,000      
Buildings 31,611,000      
Total 39,854,000      
Accumulated Depreciation $ 1,122,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Net-lease hotel in Munich, Germany        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 17,892,000      
Buildings 61,405,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 6,331,000      
Gross Amount at which Carried at Close of Period        
Land 19,320,000      
Buildings 66,308,000      
Total 85,628,000      
Accumulated Depreciation $ 2,353,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Plymouth, MN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 10,189,000      
Initial Cost to Company        
Land 3,693,000      
Buildings 13,242,000      
Cost Capitalized Subsequent to Acquisition 457,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,693,000      
Buildings 13,699,000      
Total 17,392,000      
Accumulated Depreciation $ 490,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Net-lease hotel in Hamburg, Germany        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 16,479,000      
Initial Cost to Company        
Land 7,328,000      
Buildings 17,467,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 1,981,000      
Gross Amount at which Carried at Close of Period        
Land 7,914,000      
Buildings 18,862,000      
Total 26,776,000      
Accumulated Depreciation $ 669,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facility in Oslo, Norway        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 52,906,000      
Initial Cost to Company        
Land 27,948,000      
Buildings 64,033,000      
Cost Capitalized Subsequent to Acquisition 930,000      
Increase (Decrease) in Net Investments (4,841,000)      
Gross Amount at which Carried at Close of Period        
Land 26,483,000      
Buildings 61,587,000      
Total 88,070,000      
Accumulated Depreciation $ 2,234,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Michalovce, Slovakia        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,538,000      
Buildings 19,009,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 1,881,000      
Gross Amount at which Carried at Close of Period        
Land 4,901,000      
Buildings 20,527,000      
Total 25,428,000      
Accumulated Depreciation $ 728,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Net-lease hotel in Stuttgart, Germany        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 0      
Buildings 31,276,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 2,497,000      
Gross Amount at which Carried at Close of Period        
Land 0      
Buildings 33,773,000      
Total 33,773,000      
Accumulated Depreciation $ 1,198,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Menomonee Falls, WI        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 11,677,000      
Initial Cost to Company        
Land 2,726,000      
Buildings 17,453,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,726,000      
Buildings 17,453,000      
Total 20,179,000      
Accumulated Depreciation $ 619,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Iowa Falls, IA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 6,192,000      
Initial Cost to Company        
Land 997,000      
Buildings 8,819,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 997,000      
Buildings 8,819,000      
Total 9,816,000      
Accumulated Depreciation $ 313,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Westlake, OH        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,928,000      
Buildings 24,353,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,928,000      
Buildings 24,353,000      
Total 26,281,000      
Accumulated Depreciation $ 861,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Hebron, Ohio and warehouse facility in Strongsville, OH        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,671,000      
Buildings 5,494,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 4,671,000      
Buildings 5,494,000      
Total 10,165,000      
Accumulated Depreciation $ 192,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Scarborough, Canada        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 5,092,000      
Buildings 1,868,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 5,092,000      
Buildings 1,868,000      
Total 6,960,000      
Accumulated Depreciation $ 65,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Specialty facilities in West Des Moines, IA and Clifton Park, NY        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,229,000      
Buildings 17,080,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,229,000      
Buildings 17,080,000      
Total 20,309,000      
Accumulated Depreciation $ 593,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Orzinuovi, Italy        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,473,000      
Buildings 9,892,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 1,289,000      
Gross Amount at which Carried at Close of Period        
Land 2,731,000      
Buildings 10,923,000      
Total 13,654,000      
Accumulated Depreciation $ 369,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Specialty facilities in West Chester, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 0      
Buildings 559,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 0      
Buildings 559,000      
Total 559,000      
Accumulated Depreciation $ 24,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in the United States        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 11,117,000      
Buildings 41,107,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 11,117,000      
Buildings 41,107,000      
Total 52,224,000      
Accumulated Depreciation $ 1,059,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Romulus, MI        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,788,000      
Buildings 33,353,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,788,000      
Buildings 33,353,000      
Total 36,141,000      
Accumulated Depreciation $ 838,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facility in Salisbury, NC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,308,000      
Buildings 13,082,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,308,000      
Buildings 13,082,000      
Total 14,390,000      
Accumulated Depreciation $ 329,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in the United States        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 11,503,000      
Buildings 42,967,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 11,503,000      
Buildings 42,967,000      
Total 54,470,000      
Accumulated Depreciation $ 1,042,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in Italy and Spain        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 21,167,000      
Buildings 56,172,000      
Cost Capitalized Subsequent to Acquisition 1,000      
Increase (Decrease) in Net Investments 1,216,000      
Gross Amount at which Carried at Close of Period        
Land 21,500,000      
Buildings 57,056,000      
Total 78,556,000      
Accumulated Depreciation $ 1,110,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial and warehouse facilities in Canada        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 71,228,000      
Buildings 330,400,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 71,228,000      
Buildings 330,400,000      
Total 401,628,000      
Accumulated Depreciation $ 6,223,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial facilities in Canada, Mexico, and the United States        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 11,873,000      
Buildings 55,997,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 11,873,000      
Buildings 55,997,000      
Total 67,870,000      
Accumulated Depreciation $ 990,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail (car wash) facilities in the United States        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 9,511,000      
Buildings 32,777,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 9,511,000      
Buildings 32,777,000      
Total 42,288,000      
Accumulated Depreciation $ 468,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Education and specialty facilities in the United States        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 11,973,000      
Buildings 90,101,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 11,973,000      
Buildings 90,101,000      
Total 102,074,000      
Accumulated Depreciation $ 1,234,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail (car wash) facilities in the United States        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 8,120,000      
Buildings 22,857,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 8,120,000      
Buildings 22,857,000      
Total 30,977,000      
Accumulated Depreciation $ 70,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial and warehouse facilities in Italy, Germany, and Spain        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 40,752,000      
Buildings 97,622,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 819,000      
Gross Amount at which Carried at Close of Period        
Land 40,993,000      
Buildings 98,200,000      
Total 139,193,000      
Accumulated Depreciation $ 222,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Warehouse facility in Houston, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 18,999,000      
Buildings 27,199,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 18,999,000      
Buildings 27,199,000      
Total 46,198,000      
Accumulated Depreciation $ 50,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Industrial and research and development facilities in San Diego, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 5,739,000      
Buildings 6,397,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 5,739,000      
Buildings 6,397,000      
Total 12,136,000      
Accumulated Depreciation $ 9,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Real Estate Subject to Operating Leases | Retail facility in Phoenix, AZ        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,729,000      
Buildings 9,201,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,729,000      
Buildings 9,201,000      
Total 10,930,000      
Accumulated Depreciation $ 6,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Direct Financing Method        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 9,353,000      
Initial Cost to Company        
Land 67,608,000      
Buildings 529,219,000      
Cost Capitalized Subsequent to Acquisition 5,582,000      
Increase (Decrease) in Net Investments (171,081,000)      
Gross Amount at which Carried at Close of Period        
Total 431,328,000      
Less: allowance for credit losses (36,977,000)      
Direct Financing Method | Industrial facilities in Irving and Houston, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 0      
Buildings 27,599,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (4,295,000)      
Gross Amount at which Carried at Close of Period        
Total 23,304,000      
Direct Financing Method | Retail facility in Freehold, NJ        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 0      
Buildings 17,067,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (495,000)      
Gross Amount at which Carried at Close of Period        
Total 16,572,000      
Direct Financing Method | Retail facilities in Germany        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 28,734,000      
Buildings 145,854,000      
Cost Capitalized Subsequent to Acquisition 5,582,000      
Increase (Decrease) in Net Investments (60,775,000)      
Gross Amount at which Carried at Close of Period        
Total 119,395,000      
Direct Financing Method | Warehouse facility in Brierley Hill, United Kingdom        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 2,147,000      
Buildings 12,357,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (1,864,000)      
Gross Amount at which Carried at Close of Period        
Total 12,640,000      
Direct Financing Method | Retail facilities in El Paso and Fabens, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 4,777,000      
Buildings 17,823,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (122,000)      
Gross Amount at which Carried at Close of Period        
Total 22,478,000      
Direct Financing Method | Retail facility in Gronau, Germany        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 281,000      
Buildings 4,401,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (881,000)      
Gross Amount at which Carried at Close of Period        
Total 3,801,000      
Direct Financing Method | Industrial facility in Mount Carmel, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 135,000      
Buildings 3,265,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (364,000)      
Gross Amount at which Carried at Close of Period        
Total 3,036,000      
Direct Financing Method | Retail facility in Vantaa, Finland        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 5,291,000      
Buildings 15,522,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (3,918,000)      
Gross Amount at which Carried at Close of Period        
Total 16,895,000      
Direct Financing Method | Retail facility in Linköping, Sweden        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 1,484,000      
Buildings 9,402,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (3,844,000)      
Gross Amount at which Carried at Close of Period        
Total 7,042,000      
Direct Financing Method | Industrial facility in Calgary, Canada        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 0      
Buildings 7,076,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (1,105,000)      
Gross Amount at which Carried at Close of Period        
Total 5,971,000      
Direct Financing Method | Industrial facilities in Fair Bluff, NC and Valencia, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 5,780,000      
Buildings 40,860,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (37,179,000)      
Gross Amount at which Carried at Close of Period        
Total 9,461,000      
Direct Financing Method | Industrial facility in Göppingen, Germany        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 10,717,000      
Buildings 60,120,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (19,043,000)      
Gross Amount at which Carried at Close of Period        
Total 51,794,000      
Direct Financing Method | Warehouse facilities in Bristol, Leeds, Liverpool, Luton, Newport, Plymouth, and Southampton, United Kingdom        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 1,062,000      
Buildings 23,087,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (532,000)      
Gross Amount at which Carried at Close of Period        
Total 23,617,000      
Direct Financing Method | Warehouse facility in Gieten, Netherlands        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 0      
Buildings 15,258,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (523,000)      
Gross Amount at which Carried at Close of Period        
Total 14,735,000      
Direct Financing Method | Warehouse facility in Oxnard, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 0      
Buildings 10,960,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (1,926,000)      
Gross Amount at which Carried at Close of Period        
Total 9,034,000      
Direct Financing Method | Industrial facilities in Bartow, FL; Momence, IL; Smithfield, NC; Hudson, NY; and Ardmore, OK        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 4,454,000      
Buildings 87,030,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 3,129,000      
Gross Amount at which Carried at Close of Period        
Total 94,613,000      
Direct Financing Method | Industrial facility in Countryside, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 563,000      
Buildings 1,457,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 36,000      
Gross Amount at which Carried at Close of Period        
Total 2,056,000      
Direct Financing Method | Industrial facility in Clarksville, TN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 2,705,000      
Initial Cost to Company        
Land 1,680,000      
Buildings 10,180,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (253,000)      
Gross Amount at which Carried at Close of Period        
Total 11,607,000      
Direct Financing Method | Industrial facility in Bluffton, IN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 1,592,000      
Initial Cost to Company        
Land 503,000      
Buildings 3,407,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (57,000)      
Gross Amount at which Carried at Close of Period        
Total 3,853,000      
Direct Financing Method | Warehouse facility in Houston, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 0      
Buildings 5,977,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (166,000)      
Gross Amount at which Carried at Close of Period        
Total 5,811,000      
Direct Financing Method | Warehouse in Chicago, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 5,056,000      
Initial Cost to Company        
Land 0      
Buildings 10,517,000      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 73,000      
Gross Amount at which Carried at Close of Period        
Total 10,590,000      
Operating Real Estate        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 208,721,000      
Initial Cost to Company        
Land 150,020,000      
Buildings 1,021,083,000      
Personal Property 3,622,000      
Cost Capitalized Subsequent to Acquisition 71,695,000      
Increase (Decrease) in Net Investments 8,299,000      
Gross Amount at which Carried at Close of Period        
Land 150,084,000      
Buildings 1,095,520,000      
Personal Property 9,115,000      
Total 1,254,719,000 1,077,326,000 83,673,000 83,476,000
Accumulated Depreciation 80,057,000 $ 28,295,000 $ 16,750,000 $ 14,004,000
Operating Real Estate | Bloomington, MN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances 0      
Initial Cost to Company        
Land 3,810,000      
Buildings 29,126,000      
Personal Property 3,622,000      
Cost Capitalized Subsequent to Acquisition 6,720,000      
Increase (Decrease) in Net Investments (314,000)      
Gross Amount at which Carried at Close of Period        
Land 3,874,000      
Buildings 31,296,000      
Personal Property 7,794,000      
Total 42,964,000      
Accumulated Depreciation $ 15,771,000      
Life on which Depreciation in Latest Statement of  Income is Computed 34 years      
Operating Real Estate | Newark, NJ        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 4,912,000      
Buildings 5,581,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 58,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 4,912,000      
Buildings 5,581,000      
Personal Property 58,000      
Total 10,551,000      
Accumulated Depreciation $ 1,720,000      
Life on which Depreciation in Latest Statement of  Income is Computed 37 years      
Operating Real Estate | Sacramento, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,690,000      
Buildings 18,472,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 7,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,690,000      
Buildings 18,472,000      
Personal Property 7,000      
Total 20,169,000      
Accumulated Depreciation $ 5,577,000      
Life on which Depreciation in Latest Statement of  Income is Computed 38 years      
Operating Real Estate | San Diego, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,899,000      
Buildings 33,729,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 19,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,899,000      
Buildings 33,729,000      
Personal Property 19,000      
Total 37,647,000      
Accumulated Depreciation $ 10,369,000      
Life on which Depreciation in Latest Statement of  Income is Computed 37 years      
Operating Real Estate | Irvine, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,720,000      
Buildings 24,983,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 22,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,720,000      
Buildings 24,983,000      
Personal Property 22,000      
Total 28,725,000      
Accumulated Depreciation $ 8,164,000      
Life on which Depreciation in Latest Statement of  Income is Computed 35 years      
Operating Real Estate | Austin, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 12,994,000      
Buildings 60,006,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 68,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 12,994,000      
Buildings 60,033,000      
Personal Property 41,000      
Total 73,068,000      
Accumulated Depreciation $ 2,132,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Swansea, United Kingdom        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 0      
Buildings 32,884,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 59,389,000      
Increase (Decrease) in Net Investments 8,613,000      
Gross Amount at which Carried at Close of Period        
Land 0      
Buildings 100,886,000      
Personal Property 0      
Total 100,886,000      
Accumulated Depreciation $ 2,860,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Loves Park, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,412,000      
Buildings 4,853,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 103,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,412,000      
Buildings 4,921,000      
Personal Property 35,000      
Total 6,368,000      
Accumulated Depreciation $ 969,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Cherry Valley, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,339,000      
Buildings 4,160,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 18,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,339,000      
Buildings 4,160,000      
Personal Property 18,000      
Total 5,517,000      
Accumulated Depreciation $ 795,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Rockford, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 695,000      
Buildings 3,873,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 125,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 695,000      
Buildings 3,983,000      
Personal Property 15,000      
Total 4,693,000      
Accumulated Depreciation $ 687,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Rockford, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 87,000      
Buildings 785,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 87,000      
Buildings 785,000      
Personal Property 0      
Total 872,000      
Accumulated Depreciation $ 122,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Rockford, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 454,000      
Buildings 4,724,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 14,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 454,000      
Buildings 4,733,000      
Personal Property 5,000      
Total 5,192,000      
Accumulated Depreciation $ 677,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Peoria, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 444,000      
Buildings 4,944,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 238,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 444,000      
Buildings 5,164,000      
Personal Property 18,000      
Total 5,626,000      
Accumulated Depreciation $ 1,074,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | East Peoria, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 268,000      
Buildings 3,290,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 108,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 268,000      
Buildings 3,374,000      
Personal Property 24,000      
Total 3,666,000      
Accumulated Depreciation $ 661,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Loves Park, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 721,000      
Buildings 2,973,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 27,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 721,000      
Buildings 3,000,000      
Personal Property 0      
Total 3,721,000      
Accumulated Depreciation $ 532,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Winder, GA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 338,000      
Buildings 1,310,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 107,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 338,000      
Buildings 1,375,000      
Personal Property 42,000      
Total 1,755,000      
Accumulated Depreciation $ 277,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Winder, GA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 821,000      
Buildings 3,180,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 43,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 821,000      
Buildings 3,198,000      
Personal Property 25,000      
Total 4,044,000      
Accumulated Depreciation $ 607,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Kissimmee, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 6,212,000      
Initial Cost to Company        
Land 2,147,000      
Buildings 17,164,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 11,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,147,000      
Buildings 17,171,000      
Personal Property 4,000      
Total 19,322,000      
Accumulated Depreciation $ 610,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | St. Petersburg, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 6,656,000      
Initial Cost to Company        
Land 1,505,000      
Buildings 16,229,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 43,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,505,000      
Buildings 16,254,000      
Personal Property 18,000      
Total 17,777,000      
Accumulated Depreciation $ 577,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Corpus Christi, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 2,525,000      
Initial Cost to Company        
Land 904,000      
Buildings 10,779,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 163,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 904,000      
Buildings 10,897,000      
Personal Property 45,000      
Total 11,846,000      
Accumulated Depreciation $ 394,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Palm Desert, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 6,383,000      
Initial Cost to Company        
Land 1,036,000      
Buildings 22,714,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,036,000      
Buildings 22,714,000      
Personal Property 0      
Total 23,750,000      
Accumulated Depreciation $ 806,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Kailua-Kona, HI        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 3,493,000      
Initial Cost to Company        
Land 1,425,000      
Buildings 12,267,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 59,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,425,000      
Buildings 12,317,000      
Personal Property 9,000      
Total 13,751,000      
Accumulated Depreciation $ 440,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Miami, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 2,811,000      
Initial Cost to Company        
Land 3,680,000      
Buildings 7,215,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 729,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,680,000      
Buildings 7,926,000      
Personal Property 18,000      
Total 11,624,000      
Accumulated Depreciation $ 299,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Columbia, SC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 2,831,000      
Initial Cost to Company        
Land 2,481,000      
Buildings 5,217,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 9,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,481,000      
Buildings 5,222,000      
Personal Property 4,000      
Total 7,707,000      
Accumulated Depreciation $ 185,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Kailua-Kona, HI        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 3,266,000      
Initial Cost to Company        
Land 2,889,000      
Buildings 16,397,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 207,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,889,000      
Buildings 16,542,000      
Personal Property 62,000      
Total 19,493,000      
Accumulated Depreciation $ 591,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Pompano Beach, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 2,823,000      
Initial Cost to Company        
Land 1,227,000      
Buildings 10,897,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 465,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,227,000      
Buildings 11,316,000      
Personal Property 46,000      
Total 12,589,000      
Accumulated Depreciation $ 392,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Jensen Beach, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 5,209,000      
Initial Cost to Company        
Land 1,544,000      
Buildings 15,841,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 177,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,544,000      
Buildings 16,001,000      
Personal Property 17,000      
Total 17,562,000      
Accumulated Depreciation $ 569,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Dickinson, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 5,996,000      
Initial Cost to Company        
Land 1,952,000      
Buildings 8,826,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 46,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,952,000      
Buildings 8,857,000      
Personal Property 15,000      
Total 10,824,000      
Accumulated Depreciation $ 314,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Humble, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 4,694,000      
Initial Cost to Company        
Land 813,000      
Buildings 6,459,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 36,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 813,000      
Buildings 6,459,000      
Personal Property 36,000      
Total 7,308,000      
Accumulated Depreciation $ 230,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Temecula, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 6,057,000      
Initial Cost to Company        
Land 2,368,000      
Buildings 20,802,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 35,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,368,000      
Buildings 20,837,000      
Personal Property 0      
Total 23,205,000      
Accumulated Depreciation $ 738,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Cumming, GA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 2,665,000      
Initial Cost to Company        
Land 655,000      
Buildings 10,455,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 20,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 655,000      
Buildings 10,455,000      
Personal Property 20,000      
Total 11,130,000      
Accumulated Depreciation $ 373,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Naples, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 9,994,000      
Initial Cost to Company        
Land 6,826,000      
Buildings 20,254,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 263,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 6,826,000      
Buildings 20,493,000      
Personal Property 24,000      
Total 27,343,000      
Accumulated Depreciation $ 747,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Valrico, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 5,603,000      
Initial Cost to Company        
Land 1,423,000      
Buildings 11,316,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 32,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,423,000      
Buildings 11,333,000      
Personal Property 15,000      
Total 12,771,000      
Accumulated Depreciation $ 404,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Tallahassee, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 4,905,000      
Initial Cost to Company        
Land 1,534,000      
Buildings 14,416,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 46,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,534,000      
Buildings 14,444,000      
Personal Property 18,000      
Total 15,996,000      
Accumulated Depreciation $ 514,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Sebastian, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 1,817,000      
Initial Cost to Company        
Land 529,000      
Buildings 7,917,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 38,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 529,000      
Buildings 7,955,000      
Personal Property 0      
Total 8,484,000      
Accumulated Depreciation $ 284,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Lady Lake, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 3,933,000      
Initial Cost to Company        
Land 928,000      
Buildings 11,881,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 11,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 928,000      
Buildings 11,881,000      
Personal Property 11,000      
Total 12,820,000      
Accumulated Depreciation $ 422,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Panama City Beach, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 2,613,000      
Initial Cost to Company        
Land 736,000      
Buildings 7,581,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 12,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 736,000      
Buildings 7,590,000      
Personal Property 3,000      
Total 8,329,000      
Accumulated Depreciation $ 270,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Hesperia, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,416,000      
Buildings 18,691,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 22,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,416,000      
Buildings 18,702,000      
Personal Property 11,000      
Total 20,129,000      
Accumulated Depreciation $ 666,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Hesperia, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 639,000      
Buildings 9,412,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 9,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 639,000      
Buildings 9,421,000      
Personal Property 0      
Total 10,060,000      
Accumulated Depreciation $ 334,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Hesperia, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 699,000      
Buildings 12,896,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 103,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 699,000      
Buildings 12,995,000      
Personal Property 4,000      
Total 13,698,000      
Accumulated Depreciation $ 464,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Highland, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,465,000      
Buildings 11,966,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 13,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,465,000      
Buildings 11,966,000      
Personal Property 13,000      
Total 13,444,000      
Accumulated Depreciation $ 426,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Lancaster, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 598,000      
Buildings 12,100,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 598,000      
Buildings 12,100,000      
Personal Property 0      
Total 12,698,000      
Accumulated Depreciation $ 429,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Rialto, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,502,000      
Buildings 16,924,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 14,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,502,000      
Buildings 16,924,000      
Personal Property 14,000      
Total 20,440,000      
Accumulated Depreciation $ 601,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Thousand Palms, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,465,000      
Buildings 17,632,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 12,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,465,000      
Buildings 17,642,000      
Personal Property 2,000      
Total 20,109,000      
Accumulated Depreciation $ 626,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Lilburn, GA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 2,331,000      
Initial Cost to Company        
Land 1,555,000      
Buildings 6,225,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 29,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,555,000      
Buildings 6,236,000      
Personal Property 18,000      
Total 7,809,000      
Accumulated Depreciation $ 225,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Stockbridge GA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 1,619,000      
Initial Cost to Company        
Land 308,000      
Buildings 7,238,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 53,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 308,000      
Buildings 7,268,000      
Personal Property 23,000      
Total 7,599,000      
Accumulated Depreciation $ 263,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Louisville, KY        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 6,582,000      
Initial Cost to Company        
Land 3,115,000      
Buildings 13,908,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 147,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,115,000      
Buildings 14,026,000      
Personal Property 29,000      
Total 17,170,000      
Accumulated Depreciation $ 522,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | St. Peters, MO        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 2,309,000      
Initial Cost to Company        
Land 386,000      
Buildings 5,521,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 108,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 386,000      
Buildings 5,595,000      
Personal Property 34,000      
Total 6,015,000      
Accumulated Depreciation $ 207,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Crystal Lake, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 2,622,000      
Initial Cost to Company        
Land 1,325,000      
Buildings 6,056,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 4,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,325,000      
Buildings 6,058,000      
Personal Property 2,000      
Total 7,385,000      
Accumulated Depreciation $ 215,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Las Vegas, NV        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 6,345,000      
Initial Cost to Company        
Land 717,000      
Buildings 20,963,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 216,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 717,000      
Buildings 21,156,000      
Personal Property 23,000      
Total 21,896,000      
Accumulated Depreciation $ 749,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Panama City Beach, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 6,151,000      
Initial Cost to Company        
Land 666,000      
Buildings 17,086,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 50,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 666,000      
Buildings 17,104,000      
Personal Property 32,000      
Total 17,802,000      
Accumulated Depreciation $ 609,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Sarasota, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 5,203,000      
Initial Cost to Company        
Land 1,076,000      
Buildings 13,597,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 19,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,076,000      
Buildings 13,602,000      
Personal Property 14,000      
Total 14,692,000      
Accumulated Depreciation $ 484,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Sarasota, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 3,804,000      
Initial Cost to Company        
Land 638,000      
Buildings 10,175,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 43,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 638,000      
Buildings 10,197,000      
Personal Property 21,000      
Total 10,856,000      
Accumulated Depreciation $ 363,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Leesburg, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 2,406,000      
Initial Cost to Company        
Land 1,272,000      
Buildings 5,888,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 33,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,272,000      
Buildings 5,910,000      
Personal Property 11,000      
Total 7,193,000      
Accumulated Depreciation $ 210,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Palm Bay, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 7,154,000      
Initial Cost to Company        
Land 2,814,000      
Buildings 21,425,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 38,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,814,000      
Buildings 21,442,000      
Personal Property 21,000      
Total 24,277,000      
Accumulated Depreciation $ 762,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Houston, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 4,617,000      
Initial Cost to Company        
Land 1,878,000      
Buildings 8,719,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 85,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,878,000      
Buildings 8,801,000      
Personal Property 3,000      
Total 10,682,000      
Accumulated Depreciation $ 315,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Hudson, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 3,252,000      
Initial Cost to Company        
Land 669,000      
Buildings 6,092,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 41,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 669,000      
Buildings 6,092,000      
Personal Property 41,000      
Total 6,802,000      
Accumulated Depreciation $ 218,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Las Vegas, NV        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 2,341,000      
Initial Cost to Company        
Land 918,000      
Buildings 12,355,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 101,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 918,000      
Buildings 12,455,000      
Personal Property 1,000      
Total 13,374,000      
Accumulated Depreciation $ 444,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Las Vegas, NV        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 2,211,000      
Initial Cost to Company        
Land 829,000      
Buildings 11,275,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 43,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 829,000      
Buildings 11,286,000      
Personal Property 32,000      
Total 12,147,000      
Accumulated Depreciation $ 403,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Ithaca, NY        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 2,296,000      
Initial Cost to Company        
Land 890,000      
Buildings 4,484,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 10,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 890,000      
Buildings 4,484,000      
Personal Property 10,000      
Total 5,384,000      
Accumulated Depreciation $ 160,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Kissimmee, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 626,000      
Buildings 13,147,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 15,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 626,000      
Buildings 13,160,000      
Personal Property 2,000      
Total 13,788,000      
Accumulated Depreciation $ 468,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | El Paso, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 3,707,000      
Initial Cost to Company        
Land 2,126,000      
Buildings 5,628,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 73,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,126,000      
Buildings 5,701,000      
Personal Property 0      
Total 7,827,000      
Accumulated Depreciation $ 203,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | El Paso, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 2,544,000      
Initial Cost to Company        
Land 1,053,000      
Buildings 4,583,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 8,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,053,000      
Buildings 4,588,000      
Personal Property 3,000      
Total 5,644,000      
Accumulated Depreciation $ 164,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | El Paso, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 3,615,000      
Initial Cost to Company        
Land 994,000      
Buildings 7,451,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 108,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 994,000      
Buildings 7,556,000      
Personal Property 3,000      
Total 8,553,000      
Accumulated Depreciation $ 270,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | El Paso, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 3,632,000      
Initial Cost to Company        
Land 1,295,000      
Buildings 6,318,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 36,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,295,000      
Buildings 6,354,000      
Personal Property 0      
Total 7,649,000      
Accumulated Depreciation $ 226,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | El Paso, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 1,429,000      
Initial Cost to Company        
Land 587,000      
Buildings 3,121,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 14,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 587,000      
Buildings 3,121,000      
Personal Property 14,000      
Total 3,722,000      
Accumulated Depreciation $ 114,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | El Paso, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 3,721,000      
Initial Cost to Company        
Land 1,143,000      
Buildings 5,894,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 92,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,143,000      
Buildings 5,986,000      
Personal Property 0      
Total 7,129,000      
Accumulated Depreciation $ 214,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Fernandina Beach, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 7,275,000      
Initial Cost to Company        
Land 2,664,000      
Buildings 25,000,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 15,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,664,000      
Buildings 25,012,000      
Personal Property 3,000      
Total 27,679,000      
Accumulated Depreciation $ 888,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Kissimmee, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 3,451,000      
Initial Cost to Company        
Land 2,149,000      
Buildings 6,223,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 174,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,149,000      
Buildings 6,388,000      
Personal Property 9,000      
Total 8,546,000      
Accumulated Depreciation $ 227,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Houston, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 2,760,000      
Initial Cost to Company        
Land 1,350,000      
Buildings 6,257,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 12,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,350,000      
Buildings 6,257,000      
Personal Property 12,000      
Total 7,619,000      
Accumulated Depreciation $ 223,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Houston, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 2,960,000      
Initial Cost to Company        
Land 1,112,000      
Buildings 8,044,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 82,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,112,000      
Buildings 8,094,000      
Personal Property 32,000      
Total 9,238,000      
Accumulated Depreciation $ 289,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Portland, OR        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 6,354,000      
Initial Cost to Company        
Land 994,000      
Buildings 10,176,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 1,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 994,000      
Buildings 10,176,000      
Personal Property 1,000      
Total 11,171,000      
Accumulated Depreciation $ 361,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Greensboro, NC        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 4,040,000      
Initial Cost to Company        
Land 1,389,000      
Buildings 15,175,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 178,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,389,000      
Buildings 15,275,000      
Personal Property 78,000      
Total 16,742,000      
Accumulated Depreciation $ 546,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Avondale, LA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 3,425,000      
Initial Cost to Company        
Land 1,154,000      
Buildings 9,090,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,154,000      
Buildings 9,090,000      
Personal Property 0      
Total 10,244,000      
Accumulated Depreciation $ 323,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Washington, D.C.        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,371,000      
Buildings 13,655,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,371,000      
Buildings 13,655,000      
Personal Property 0      
Total 17,026,000      
Accumulated Depreciation $ 484,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Kissimmee, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,770,000      
Buildings 7,034,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 36,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,770,000      
Buildings 7,052,000      
Personal Property 18,000      
Total 8,840,000      
Accumulated Depreciation $ 252,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Milford, MA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 951,000      
Buildings 11,935,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 9,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 951,000      
Buildings 11,935,000      
Personal Property 9,000      
Total 12,895,000      
Accumulated Depreciation $ 424,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Millsboro, DE        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,180,000      
Buildings 14,286,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,180,000      
Buildings 14,286,000      
Personal Property 0      
Total 15,466,000      
Accumulated Depreciation $ 507,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | New Castle, DE        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,110,000      
Buildings 15,787,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,110,000      
Buildings 15,787,000      
Personal Property 0      
Total 16,897,000      
Accumulated Depreciation $ 560,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Rehoboth, DE        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 8,079,000      
Initial Cost to Company        
Land 1,565,000      
Buildings 18,284,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 13,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,565,000      
Buildings 18,284,000      
Personal Property 13,000      
Total 19,862,000      
Accumulated Depreciation $ 650,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Chicago, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 787,000      
Buildings 4,931,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 112,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 787,000      
Buildings 5,013,000      
Personal Property 30,000      
Total 5,830,000      
Accumulated Depreciation $ 186,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Gilroy, CA        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,058,000      
Buildings 13,014,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 42,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,058,000      
Buildings 13,029,000      
Personal Property 27,000      
Total 16,114,000      
Accumulated Depreciation $ 465,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Little Rock, AR        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,703,000      
Buildings 4,358,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,703,000      
Buildings 4,358,000      
Personal Property 0      
Total 6,061,000      
Accumulated Depreciation $ 58,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Houston, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,701,000      
Buildings 8,945,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 14,000      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,701,000      
Buildings 8,945,000      
Personal Property 14,000      
Total 12,660,000      
Accumulated Depreciation $ 80,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Knoxville, TN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,783,000      
Buildings 5,913,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,783,000      
Buildings 5,913,000      
Personal Property 0      
Total 9,696,000      
Accumulated Depreciation $ 10,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Springfield, TN        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 1,587,000      
Buildings 3,651,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,587,000      
Buildings 3,651,000      
Personal Property 0      
Total 5,238,000      
Accumulated Depreciation $ 6,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years      
Operating Real Estate | Bastrop, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,772,000      
Buildings 9,055,000      
Personal Property 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,772,000      
Buildings 9,055,000      
Personal Property 0      
Total 11,827,000      
Accumulated Depreciation $ 11,000      
Life on which Depreciation in Latest Statement of  Income is Computed 40 years