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Schedule III - Real Estate and Accumulated Depreciation - Section 20 (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 $ 2,071,038      
Land 2,907,509      
Buildings, Fixtures and Improvements 10,769,845      
Costs Capitalized Subsequent to Acquisition (99,654)      
Gross Amount Carried at December 31, 2017 13,577,700 $ 13,539,921 $ 14,566,343 $ 15,857,507
Accumulated Depreciation (2,217,108) $ (1,766,006) $ (1,331,751) $ (775,050)
Tractor Supply [Member] | Plymouth, NH [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 2,074      
Land 424      
Buildings, Fixtures and Improvements 2,430      
Costs Capitalized Subsequent to Acquisition 16      
Gross Amount Carried at December 31, 2017 2,870      
Accumulated Depreciation (586)      
Tractor Supply [Member] | Allentown, NJ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 697      
Buildings, Fixtures and Improvements 3,949      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,646      
Accumulated Depreciation (1,069)      
Tractor Supply [Member] | Sicklerville, NJ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,931      
Buildings, Fixtures and Improvements 4,302      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 6,233      
Accumulated Depreciation (720)      
Tractor Supply [Member] | Farmington, NM [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,091      
Buildings, Fixtures and Improvements 2,194      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,285      
Accumulated Depreciation (415)      
Tractor Supply [Member] | Roswell, NM [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 947      
Buildings, Fixtures and Improvements 2,181      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,128      
Accumulated Depreciation (382)      
Tractor Supply [Member] | Silver City, NM [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 716      
Buildings, Fixtures and Improvements 2,380      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,096      
Accumulated Depreciation (450)      
Tractor Supply [Member] | Macedon, NY [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 168      
Buildings, Fixtures and Improvements 1,591      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,759      
Accumulated Depreciation (295)      
Tractor Supply [Member] | Hamilton, OH [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 932      
Land 675      
Buildings, Fixtures and Improvements 1,472      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,147      
Accumulated Depreciation (368)      
Tractor Supply [Member] | Wauseon, OH [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 1,374      
Land 931      
Buildings, Fixtures and Improvements 2,128      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,059      
Accumulated Depreciation (390)      
Tractor Supply [Member] | Chickasha, OK [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 599      
Buildings, Fixtures and Improvements 2,056      
Costs Capitalized Subsequent to Acquisition 538      
Gross Amount Carried at December 31, 2017 3,193      
Accumulated Depreciation (418)      
Tractor Supply [Member] | Glenpool, OK [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 1,180      
Land 359      
Buildings, Fixtures and Improvements 2,447      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,806      
Accumulated Depreciation (415)      
Tractor Supply [Member] | Stillwater, OK [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 1,205      
Land 205      
Buildings, Fixtures and Improvements 2,715      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,920      
Accumulated Depreciation (458)      
Tractor Supply [Member] | Gibsonia, PA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 1,648      
Land 1,044      
Buildings, Fixtures and Improvements 2,778      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,822      
Accumulated Depreciation (488)      
Tractor Supply [Member] | Columbia, SC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 952      
Buildings, Fixtures and Improvements 2,222      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,174      
Accumulated Depreciation (370)      
Tractor Supply [Member] | Irmo, SC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 725      
Buildings, Fixtures and Improvements 2,171      
Costs Capitalized Subsequent to Acquisition 62      
Gross Amount Carried at December 31, 2017 2,958      
Accumulated Depreciation (382)      
Tractor Supply [Member] | Ballinger, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 1,248      
Land 476      
Buildings, Fixtures and Improvements 2,477      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,953      
Accumulated Depreciation (407)      
Tractor Supply [Member] | Del Rio, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 927      
Buildings, Fixtures and Improvements 2,044      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,971      
Accumulated Depreciation (346)      
Tractor Supply [Member] | Edinburg, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 768      
Buildings, Fixtures and Improvements 3,163      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,931      
Accumulated Depreciation (516)      
Tractor Supply [Member] | Kenedy, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 1,180      
Land 309      
Buildings, Fixtures and Improvements 2,372      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,681      
Accumulated Depreciation (388)      
Tractor Supply [Member] | Pearsall, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 1,161      
Land 318      
Buildings, Fixtures and Improvements 2,551      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,869      
Accumulated Depreciation (422)      
Tractor Supply [Member] | Rio Grande, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 469      
Buildings, Fixtures and Improvements 1,095      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,564      
Accumulated Depreciation (281)      
Tractor Supply [Member] | Woodstock, VA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 524      
Buildings, Fixtures and Improvements 2,098      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,622      
Accumulated Depreciation (436)      
Tractor Supply [Member] | Tuscaloosa, AL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 746      
Buildings, Fixtures and Improvements 1,979      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,725      
Accumulated Depreciation (341)      
Tractor Supply [Member] | Augusta, ME [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 1,423      
Land 530      
Buildings, Fixtures and Improvements 2,756      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,286      
Accumulated Depreciation (490)      
Trader Joe's [Member] | Romney, WV [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 418      
Buildings, Fixtures and Improvements 3,097      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,515      
Accumulated Depreciation (11)      
Trader Joe's [Member] | Sarasota, FL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,646      
Buildings, Fixtures and Improvements 5,416      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 7,062      
Accumulated Depreciation (1,108)      
Trader Joe's [Member] | Lexington, KY [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 2,287      
Buildings, Fixtures and Improvements 3,795      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 6,082      
Accumulated Depreciation (811)      
Tumbleweed [Member] | Terre Haute, IN [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 434      
Buildings, Fixtures and Improvements 1,303      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,737      
Accumulated Depreciation (346)      
Tumbleweed [Member] | Louisville, KY [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 468      
Buildings, Fixtures and Improvements 1,404      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,872      
Accumulated Depreciation (372)      
Tumbleweed [Member] | Mayesville, KY [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 353      
Buildings, Fixtures and Improvements 823      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,176      
Accumulated Depreciation (218)      
Tumbleweed [Member] | Owensboro, KY [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 355      
Buildings, Fixtures and Improvements 1,420      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,775      
Accumulated Depreciation (377)      
Tumbleweed [Member] | Bellefontaine, OH [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 234      
Buildings, Fixtures and Improvements 938      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,172      
Accumulated Depreciation (249)      
Tumbleweed [Member] | Springfield, OH [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 549      
Buildings, Fixtures and Improvements 1,280      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,829      
Accumulated Depreciation (340)      
Tumbleweed [Member] | Wooster, OH [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 342      
Buildings, Fixtures and Improvements 799      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,141      
Accumulated Depreciation (212)      
Tumbleweed [Member] | Zanesville, OH [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 639      
Buildings, Fixtures and Improvements 1,491      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,130      
Accumulated Depreciation (395)      
Tutor Time [Member] | Downingtown, PA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 205      
Buildings, Fixtures and Improvements 2,788      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,993      
Accumulated Depreciation (562)      
Tutor Time [Member] | Austin, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 417      
Buildings, Fixtures and Improvements 1,861      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,278      
Accumulated Depreciation (396)      
Ulta Salon [Member] | Jonesboro, AR [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 742      
Buildings, Fixtures and Improvements 2,289      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,031      
Accumulated Depreciation (422)      
Ulta Salon [Member] | Fort Gratiot, MI [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 164      
Buildings, Fixtures and Improvements 2,083      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,247      
Accumulated Depreciation (396)      
Ulta Salon [Member] | Jackson, TN [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 1,454      
Land 547      
Buildings, Fixtures and Improvements 2,123      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,670      
Accumulated Depreciation (400)      
United Buffet and Grille [Member] | Hagerstown, MD [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 244      
Buildings, Fixtures and Improvements 1,306      
Costs Capitalized Subsequent to Acquisition (1,505)      
Gross Amount Carried at December 31, 2017 45      
Accumulated Depreciation (12)      
United Technologies [Member] | Bradenton, FL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 10,050      
Land 2,692      
Buildings, Fixtures and Improvements 17,973      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 20,665      
Accumulated Depreciation (2,969)      
University Plaza [Member] | Flagstaff, AZ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 4,727      
Buildings, Fixtures and Improvements 18,087      
Costs Capitalized Subsequent to Acquisition 491      
Gross Amount Carried at December 31, 2017 23,305      
Accumulated Depreciation (4,505)      
The UPS Store [Member] | Elizabethtown, KY [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,460      
Buildings, Fixtures and Improvements 10,336      
Costs Capitalized Subsequent to Acquisition 778      
Gross Amount Carried at December 31, 2017 12,574      
Accumulated Depreciation (2,686)      
US Bank [Member] | Alsip, IL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 226      
Buildings, Fixtures and Improvements 1,280      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,506      
Accumulated Depreciation (445)      
US Bank [Member] | Chicago, IL 2 [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 267      
Buildings, Fixtures and Improvements 1,511      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,778      
Accumulated Depreciation (526)      
US Bank [Member] | Chicago, IL 3 [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 191      
Buildings, Fixtures and Improvements 1,082      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,273      
Accumulated Depreciation (376)      
US Bank [Member] | Chicago Heights, IL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 182      
Buildings, Fixtures and Improvements 1,637      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,819      
Accumulated Depreciation (435)      
US Bank [Member] | Elmwood Park, IL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 431      
Buildings, Fixtures and Improvements 2,441      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,872      
Accumulated Depreciation (815)      
US Bank [Member] | Evergreen Park, IL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 167      
Buildings, Fixtures and Improvements 944      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,111      
Accumulated Depreciation (329)      
US Bank [Member] | Lyons, IL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 214      
Buildings, Fixtures and Improvements 1,212      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,426      
Accumulated Depreciation (422)      
US Bank [Member] | Orland Hills, IL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 2,646      
Land 1,253      
Buildings, Fixtures and Improvements 2,327      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,580      
Accumulated Depreciation (626)      
US Bank [Member] | Westchester, IL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 366      
Buildings, Fixtures and Improvements 853      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,219      
Accumulated Depreciation (223)      
US Bank [Member] | Wilmington, IL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 330      
Buildings, Fixtures and Improvements 1,872      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,202      
Accumulated Depreciation (615)      
US Bank [Member] | Fayetteville, NC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 608      
Buildings, Fixtures and Improvements 1,741      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,349      
Accumulated Depreciation (322)      
US Bank [Member] | Garfield Height, OH [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 165      
Buildings, Fixtures and Improvements 1,016      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,181      
Accumulated Depreciation (243)      
VA Clinic [Member] | Oceanside, CA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 27,749      
Land 9,489      
Buildings, Fixtures and Improvements 33,812      
Costs Capitalized Subsequent to Acquisition 105      
Gross Amount Carried at December 31, 2017 43,406      
Accumulated Depreciation (6,015)      
Vacant [Member] | Austin, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 837      
Buildings, Fixtures and Improvements 1,797      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,634      
Accumulated Depreciation (468)      
Vacant [Member] | Andalusia, AL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 94      
Buildings, Fixtures and Improvements 251      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 345      
Accumulated Depreciation (65)      
Vacant [Member] | Jasper, AL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 577      
Buildings, Fixtures and Improvements 2,545      
Costs Capitalized Subsequent to Acquisition (2,786)      
Gross Amount Carried at December 31, 2017 336      
Accumulated Depreciation (34)      
Vacant [Member] | Mobile, AL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 127      
Buildings, Fixtures and Improvements 276      
Costs Capitalized Subsequent to Acquisition (162)      
Gross Amount Carried at December 31, 2017 241      
Accumulated Depreciation (18)      
Vacant [Member] | Tuscaloosa, AL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 244      
Buildings, Fixtures and Improvements 1,306      
Costs Capitalized Subsequent to Acquisition (1,549)      
Gross Amount Carried at December 31, 2017 1      
Accumulated Depreciation 0      
Vacant [Member] | Arkedelphia, AR [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 225      
Buildings, Fixtures and Improvements 633      
Costs Capitalized Subsequent to Acquisition (595)      
Gross Amount Carried at December 31, 2017 263      
Accumulated Depreciation 0      
Vacant [Member] | Pine Bluff, AR [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 105      
Buildings, Fixtures and Improvements 433      
Costs Capitalized Subsequent to Acquisition (409)      
Gross Amount Carried at December 31, 2017 129      
Accumulated Depreciation (16)      
Vacant [Member] | Searcy, AR [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 231      
Buildings, Fixtures and Improvements 1,286      
Costs Capitalized Subsequent to Acquisition (1,318)      
Gross Amount Carried at December 31, 2017 199      
Accumulated Depreciation (30)      
Vacant [Member] | Fountain Hills, AZ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 241      
Buildings, Fixtures and Improvements 597      
Costs Capitalized Subsequent to Acquisition (228)      
Gross Amount Carried at December 31, 2017 610      
Accumulated Depreciation (13)      
Vacant [Member] | Peoria, AZ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 837      
Buildings, Fixtures and Improvements 1,953      
Costs Capitalized Subsequent to Acquisition (1,552)      
Gross Amount Carried at December 31, 2017 1,238      
Accumulated Depreciation (28)      
Vacant [Member] | Fresno, CA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 190      
Buildings, Fixtures and Improvements 1,810      
Costs Capitalized Subsequent to Acquisition (1,249)      
Gross Amount Carried at December 31, 2017 751      
Accumulated Depreciation (167)      
Vacant [Member] | Gilroy, CA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 249      
Buildings, Fixtures and Improvements 986      
Costs Capitalized Subsequent to Acquisition (1,235)      
Gross Amount Carried at December 31, 2017 0      
Accumulated Depreciation 0      
Vacant [Member] | San Luis Obispo, CA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 195      
Buildings, Fixtures and Improvements 1,013      
Costs Capitalized Subsequent to Acquisition (844)      
Gross Amount Carried at December 31, 2017 364      
Accumulated Depreciation (61)      
Vacant [Member] | Santee, CA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 265      
Buildings, Fixtures and Improvements 1,261      
Costs Capitalized Subsequent to Acquisition (1,390)      
Gross Amount Carried at December 31, 2017 136      
Accumulated Depreciation (27)      
Vacant [Member] | Vacaville, CA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 195      
Buildings, Fixtures and Improvements 1,044      
Costs Capitalized Subsequent to Acquisition (1,238)      
Gross Amount Carried at December 31, 2017 1      
Accumulated Depreciation 0      
Vacant [Member] | Highlands Ranch, CO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 3,475      
Land 2,850      
Buildings, Fixtures and Improvements 4,795      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 7,645      
Accumulated Depreciation (947)      
Vacant [Member] | Lone Tree, CO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 196      
Buildings, Fixtures and Improvements 1,014      
Costs Capitalized Subsequent to Acquisition (1,070)      
Gross Amount Carried at December 31, 2017 140      
Accumulated Depreciation (23)      
Vacant [Member] | New London, CT [Domain]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 94      
Buildings, Fixtures and Improvements 534      
Costs Capitalized Subsequent to Acquisition (448)      
Gross Amount Carried at December 31, 2017 180      
Accumulated Depreciation (2)      
Vacant [Member] | Smyrna, DE [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 183      
Buildings, Fixtures and Improvements 1,036      
Costs Capitalized Subsequent to Acquisition (994)      
Gross Amount Carried at December 31, 2017 225      
Accumulated Depreciation (5)      
Vacant [Member] | Cocoa, FL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 249      
Buildings, Fixtures and Improvements 567      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 816      
Accumulated Depreciation (143)      
Vacant [Member] | Davie, FL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 193      
Buildings, Fixtures and Improvements 1,009      
Costs Capitalized Subsequent to Acquisition (1,201)      
Gross Amount Carried at December 31, 2017 1      
Accumulated Depreciation 0      
Vacant [Member] | Lake Wales, FL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 671      
Buildings, Fixtures and Improvements 671      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,342      
Accumulated Depreciation (172)      
Vacant [Member] | Melbourne, FL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 464      
Buildings, Fixtures and Improvements 1,392      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,856      
Accumulated Depreciation (351)      
Vacant [Member] | Pinellas Park, FL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 16,200      
Land 4,538      
Buildings, Fixtures and Improvements 23,842      
Costs Capitalized Subsequent to Acquisition (17,726)      
Gross Amount Carried at December 31, 2017 10,654      
Accumulated Depreciation (810)      
Vacant [Member] | Tallahassee, FL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 828      
Buildings, Fixtures and Improvements 1,933      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,761      
Accumulated Depreciation (488)      
Vacant [Member] | Titusville, FL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 528      
Buildings, Fixtures and Improvements 239      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 767      
Accumulated Depreciation (60)      
Vacant [Member] | Bowdon, GA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 416      
Buildings, Fixtures and Improvements 1,247      
Costs Capitalized Subsequent to Acquisition (1,457)      
Gross Amount Carried at December 31, 2017 206      
Accumulated Depreciation (2)      
Vacant [Member] | Columbus, GA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,307      
Buildings, Fixtures and Improvements 2,529      
Costs Capitalized Subsequent to Acquisition (2,876)      
Gross Amount Carried at December 31, 2017 960      
Accumulated Depreciation (66)      
Vacant [Member] | Dawson, GA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 131      
Buildings, Fixtures and Improvements 274      
Costs Capitalized Subsequent to Acquisition (182)      
Gross Amount Carried at December 31, 2017 223      
Accumulated Depreciation (16)      
Vacant [Member] | Stockbridge, GA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 422      
Buildings, Fixtures and Improvements 2,391      
Costs Capitalized Subsequent to Acquisition (2,428)      
Gross Amount Carried at December 31, 2017 385      
Accumulated Depreciation (15)      
Vacant [Member] | Mason City, IA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 290      
Buildings, Fixtures and Improvements 1,255      
Costs Capitalized Subsequent to Acquisition (192)      
Gross Amount Carried at December 31, 2017 1,353      
Accumulated Depreciation (175)      
Vacant [Member] | Joliet, IL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,834      
Buildings, Fixtures and Improvements 1,585      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,419      
Accumulated Depreciation (415)      
Vacant [Member] | Lombard, IL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 84      
Buildings, Fixtures and Improvements 100      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 184      
Accumulated Depreciation (26)      
Vacant [Member] | Merrillville, IN [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 511      
Buildings, Fixtures and Improvements 4,768      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 5,279      
Accumulated Depreciation (1,042)      
Vacant [Member] | London, KY [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 370      
Buildings, Fixtures and Improvements 1,493      
Costs Capitalized Subsequent to Acquisition (666)      
Gross Amount Carried at December 31, 2017 1,197      
Accumulated Depreciation (47)      
Vacant [Member] | Nicholasville, KY [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 435      
Buildings, Fixtures and Improvements 2,040      
Costs Capitalized Subsequent to Acquisition (939)      
Gross Amount Carried at December 31, 2017 1,536      
Accumulated Depreciation (146)      
Vacant [Member] | Bossier City, LA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,168      
Buildings, Fixtures and Improvements 2,594      
Costs Capitalized Subsequent to Acquisition (2,882)      
Gross Amount Carried at December 31, 2017 880      
Accumulated Depreciation (75)      
Vacant [Member] | Detroit, MI [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 204      
Buildings, Fixtures and Improvements 1,159      
Costs Capitalized Subsequent to Acquisition (1,248)      
Gross Amount Carried at December 31, 2017 115      
Accumulated Depreciation (2)      
Vacant [Member] | Grossepointewoods, MI [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 140      
Buildings, Fixtures and Improvements 1,046      
Costs Capitalized Subsequent to Acquisition (785)      
Gross Amount Carried at December 31, 2017 401      
Accumulated Depreciation (54)      
Vacant [Member] | Harper Woods, MI [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 207      
Buildings, Fixtures and Improvements 1,171      
Costs Capitalized Subsequent to Acquisition (953)      
Gross Amount Carried at December 31, 2017 425      
Accumulated Depreciation (5)      
Vacant [Member] | Highland Park, MI [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 150      
Buildings, Fixtures and Improvements 848      
Costs Capitalized Subsequent to Acquisition (637)      
Gross Amount Carried at December 31, 2017 361      
Accumulated Depreciation (4)      
Vacant [Member] | Ypsilanti, MI [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 85      
Buildings, Fixtures and Improvements 483      
Costs Capitalized Subsequent to Acquisition (208)      
Gross Amount Carried at December 31, 2017 360      
Accumulated Depreciation 0      
Vacant [Member] | Blue Springs, MO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 810      
Buildings, Fixtures and Improvements 1,346      
Costs Capitalized Subsequent to Acquisition (1,515)      
Gross Amount Carried at December 31, 2017 641      
Accumulated Depreciation (62)      
Vacant [Member] | Chesterfield, MO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,537      
Buildings, Fixtures and Improvements 4,123      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 5,660      
Accumulated Depreciation (904)      
Vacant [Member] | Joplin, MO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 314      
Buildings, Fixtures and Improvements 1,610      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,924      
Accumulated Depreciation (359)      
Vacant [Member] | Joplin, MO 2 [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 127      
Buildings, Fixtures and Improvements 300      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 427      
Accumulated Depreciation (89)      
Vacant [Member] | Pearl, MS [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,058      
Buildings, Fixtures and Improvements 1,857      
Costs Capitalized Subsequent to Acquisition (1,893)      
Gross Amount Carried at December 31, 2017 1,022      
Accumulated Depreciation (83)      
Vacant [Member] | Albemarle, NC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 483      
Buildings, Fixtures and Improvements 457      
Costs Capitalized Subsequent to Acquisition (493)      
Gross Amount Carried at December 31, 2017 447      
Accumulated Depreciation (33)      
Vacant [Member] | Burlington, NC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 446      
Buildings, Fixtures and Improvements 545      
Costs Capitalized Subsequent to Acquisition (403)      
Gross Amount Carried at December 31, 2017 588      
Accumulated Depreciation (19)      
Vacant [Member] | Monroe, NC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 204      
Buildings, Fixtures and Improvements 1,837      
Costs Capitalized Subsequent to Acquisition (1,319)      
Gross Amount Carried at December 31, 2017 722      
Accumulated Depreciation (61)      
Vacant [Member] | Oakboro, NC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 360      
Buildings, Fixtures and Improvements 540      
Costs Capitalized Subsequent to Acquisition (605)      
Gross Amount Carried at December 31, 2017 295      
Accumulated Depreciation (2)      
Vacant [Member] | Yadkinville, NC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 200      
Buildings, Fixtures and Improvements 371      
Costs Capitalized Subsequent to Acquisition (368)      
Gross Amount Carried at December 31, 2017 203      
Accumulated Depreciation (10)      
Vacant [Member] | Zebulon, NC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 515      
Buildings, Fixtures and Improvements 630      
Costs Capitalized Subsequent to Acquisition (680)      
Gross Amount Carried at December 31, 2017 465      
Accumulated Depreciation (3)      
Vacant [Member] | Flanders, NJ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 915      
Land 1,468      
Buildings, Fixtures and Improvements 883      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,351      
Accumulated Depreciation (175)      
Vacant [Member] | Mt. Laurel, NJ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 1,447      
Land 1,332      
Buildings, Fixtures and Improvements 1,792      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,124      
Accumulated Depreciation (286)      
Vacant [Member] | Hobbs, NM [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 815      
Buildings, Fixtures and Improvements 0      
Costs Capitalized Subsequent to Acquisition (543)      
Gross Amount Carried at December 31, 2017 272      
Accumulated Depreciation 0      
Vacant [Member] | East Greenbush, NY [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 404      
Buildings, Fixtures and Improvements 269      
Costs Capitalized Subsequent to Acquisition (241)      
Gross Amount Carried at December 31, 2017 432      
Accumulated Depreciation (5)      
Vacant [Member] | Elmira, NY [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 199      
Buildings, Fixtures and Improvements 370      
Costs Capitalized Subsequent to Acquisition (441)      
Gross Amount Carried at December 31, 2017 128      
Accumulated Depreciation (4)      
Vacant [Member] | Greene, NY [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 216      
Buildings, Fixtures and Improvements 1,227      
Costs Capitalized Subsequent to Acquisition (1,068)      
Gross Amount Carried at December 31, 2017 375      
Accumulated Depreciation (7)      
Vacant [Member] | Schenectady, NY [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 292      
Buildings, Fixtures and Improvements 1,655      
Costs Capitalized Subsequent to Acquisition (847)      
Gross Amount Carried at December 31, 2017 1,100      
Accumulated Depreciation (19)      
Vacant [Member] | Cincinnati, OH [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 353      
Buildings, Fixtures and Improvements 824      
Costs Capitalized Subsequent to Acquisition (572)      
Gross Amount Carried at December 31, 2017 605      
Accumulated Depreciation (5)      
Vacant [Member] | Englewood, OH [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 547      
Buildings, Fixtures and Improvements 0      
Costs Capitalized Subsequent to Acquisition (384)      
Gross Amount Carried at December 31, 2017 163      
Accumulated Depreciation 0      
Vacant [Member] | Massillon, OH [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 212      
Buildings, Fixtures and Improvements 1,202      
Costs Capitalized Subsequent to Acquisition (1,008)      
Gross Amount Carried at December 31, 2017 406      
Accumulated Depreciation (5)      
Vacant [Member] | Mentor, OH [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 178      
Buildings, Fixtures and Improvements 1,011      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,189      
Accumulated Depreciation (352)      
Vacant [Member] | Moraine, OH [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 87      
Buildings, Fixtures and Improvements 148      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 235      
Accumulated Depreciation (28)      
Vacant [Member] | Youngstown, OH [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 139      
Buildings, Fixtures and Improvements 232      
Costs Capitalized Subsequent to Acquisition (37)      
Gross Amount Carried at December 31, 2017 334      
Accumulated Depreciation (32)      
Vacant [Member] | Tulsa, OK [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 530      
Buildings, Fixtures and Improvements 1,174      
Costs Capitalized Subsequent to Acquisition 225      
Gross Amount Carried at December 31, 2017 1,929      
Accumulated Depreciation (300)      
Vacant [Member] | The Dalles, OR [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 201      
Buildings, Fixtures and Improvements 802      
Costs Capitalized Subsequent to Acquisition (486)      
Gross Amount Carried at December 31, 2017 517      
Accumulated Depreciation (172)      
Vacant [Member] | Grants Pass, OR [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 393      
Buildings, Fixtures and Improvements 2,979      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,372      
Accumulated Depreciation (674)      
Vacant [Member] | Beaver Falls, PA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 243      
Buildings, Fixtures and Improvements 1,304      
Costs Capitalized Subsequent to Acquisition (1,489)      
Gross Amount Carried at December 31, 2017 58      
Accumulated Depreciation (9)      
Vacant [Member] | Indiana, PA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 676      
Buildings, Fixtures and Improvements 1,255      
Costs Capitalized Subsequent to Acquisition (920)      
Gross Amount Carried at December 31, 2017 1,011      
Accumulated Depreciation (105)      
Vacant [Member] | North Fayette, PA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,990      
Buildings, Fixtures and Improvements 2,700      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,690      
Accumulated Depreciation (521)      
Vacant [Member] | Lexington, SC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 244      
Buildings, Fixtures and Improvements 1,307      
Costs Capitalized Subsequent to Acquisition (1,356)      
Gross Amount Carried at December 31, 2017 195      
Accumulated Depreciation (37)      
Vacant [Member] | North Charleston, SC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 2,193      
Buildings, Fixtures and Improvements 4,636      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 6,829      
Accumulated Depreciation (1,025)      
Vacant [Member] | Travelers Rest, SC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 746      
Buildings, Fixtures and Improvements 746      
Costs Capitalized Subsequent to Acquisition (990)      
Gross Amount Carried at December 31, 2017 502      
Accumulated Depreciation (11)      
Vacant [Member] | La Vergne, TN [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 171      
Buildings, Fixtures and Improvements 209      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 380      
Accumulated Depreciation (54)      
Vacant [Member] | Memphis, TN [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 100      
Buildings, Fixtures and Improvements 283      
Costs Capitalized Subsequent to Acquisition 167      
Gross Amount Carried at December 31, 2017 550      
Accumulated Depreciation 0      
Vacant [Member] | Sevierville, TN [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,443      
Buildings, Fixtures and Improvements 430      
Costs Capitalized Subsequent to Acquisition (751)      
Gross Amount Carried at December 31, 2017 1,122      
Accumulated Depreciation (66)      
Vacant [Member] | Abilene, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 803      
Buildings, Fixtures and Improvements 0      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 803      
Accumulated Depreciation 0      
Vacant [Member] | Amarillo, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 993      
Buildings, Fixtures and Improvements 2,317      
Costs Capitalized Subsequent to Acquisition (1,848)      
Gross Amount Carried at December 31, 2017 1,462      
Accumulated Depreciation (84)      
Vacant [Member] | Bay City, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 229      
Buildings, Fixtures and Improvements 124      
Costs Capitalized Subsequent to Acquisition (220)      
Gross Amount Carried at December 31, 2017 133      
Accumulated Depreciation (5)      
Vacant [Member] | Dallas, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 810      
Buildings, Fixtures and Improvements 1,656      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,466      
Accumulated Depreciation (423)      
Vacant [Member] | Grand Prairie, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 997      
Buildings, Fixtures and Improvements 2,327      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,324      
Accumulated Depreciation (617)      
Vacant [Member] | Houston, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 900      
Buildings, Fixtures and Improvements 1,749      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,649      
Accumulated Depreciation (447)      
Vacant [Member] | Houston, TX 2 [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 980      
Buildings, Fixtures and Improvements 2,284      
Costs Capitalized Subsequent to Acquisition (1,575)      
Gross Amount Carried at December 31, 2017 1,689      
Accumulated Depreciation (76)      
Vacant [Member] | Irving, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 522      
Buildings, Fixtures and Improvements 512      
Costs Capitalized Subsequent to Acquisition (235)      
Gross Amount Carried at December 31, 2017 799      
Accumulated Depreciation (52)      
Vacant [Member] | Lubbock, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 694      
Buildings, Fixtures and Improvements 0      
Costs Capitalized Subsequent to Acquisition (301)      
Gross Amount Carried at December 31, 2017 393      
Accumulated Depreciation 0      
Vacant [Member] | Plano, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 540      
Buildings, Fixtures and Improvements 1,060      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,600      
Accumulated Depreciation (271)      
Vacant [Member] | San Angelo, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 769      
Buildings, Fixtures and Improvements 2,306      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,075      
Accumulated Depreciation (612)      
Vacant [Member] | Texas City, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 614      
Buildings, Fixtures and Improvements 3,351      
Costs Capitalized Subsequent to Acquisition (2,351)      
Gross Amount Carried at December 31, 2017 1,614      
Accumulated Depreciation (149)      
Vacant [Member] | Midlothian, VA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 230      
Buildings, Fixtures and Improvements 1,300      
Costs Capitalized Subsequent to Acquisition (861)      
Gross Amount Carried at December 31, 2017 669      
Accumulated Depreciation (27)      
Vacant [Member] | Norfolk, VA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 656      
Buildings, Fixtures and Improvements 437      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,093      
Accumulated Depreciation (110)      
Vacant [Member] | Poultney, VT [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 149      
Buildings, Fixtures and Improvements 847      
Costs Capitalized Subsequent to Acquisition (777)      
Gross Amount Carried at December 31, 2017 219      
Accumulated Depreciation (1)      
Vacant [Member] | White River Junction, VT [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 183      
Buildings, Fixtures and Improvements 1,039      
Costs Capitalized Subsequent to Acquisition (836)      
Gross Amount Carried at December 31, 2017 386      
Accumulated Depreciation (2)      
Vacant [Member] | Schofield, WI [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 106      
Buildings, Fixtures and Improvements 196      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 302      
Accumulated Depreciation (46)      
Vanguard Car Rental [Member] | College Park, GA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,561      
Buildings, Fixtures and Improvements 6,244      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 7,805      
Accumulated Depreciation (1,649)      
Velox Insurance [Member] | Woodstock, GA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 155      
Buildings, Fixtures and Improvements 127      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 282      
Accumulated Depreciation (34)      
Verizon Wireless [Member] | Statesville, NC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 207      
Buildings, Fixtures and Improvements 459      
Costs Capitalized Subsequent to Acquisition 27      
Gross Amount Carried at December 31, 2017 693      
Accumulated Depreciation (118)      
The Vitamin Shoppe [Member] | Evergreen Park, IL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 476      
Buildings, Fixtures and Improvements 1,427      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,903      
Accumulated Depreciation (377)      
The Vitamin Shoppe [Member] | Ashland, VA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 2,399      
Buildings, Fixtures and Improvements 19,663      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 22,062      
Accumulated Depreciation (4,948)      
Volusia Square [Member] | Daytona Beach, FL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 16,557      
Land 4,598      
Buildings, Fixtures and Improvements 28,511      
Costs Capitalized Subsequent to Acquisition 269      
Gross Amount Carried at December 31, 2017 33,378      
Accumulated Depreciation (5,881)      
Waffle House [Member] | Cocoa, FL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 150      
Buildings, Fixtures and Improvements 279      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 429      
Accumulated Depreciation (66)      
Walgreens [Member] | Stillwater, OK [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 368      
Buildings, Fixtures and Improvements 4,368      
Costs Capitalized Subsequent to Acquisition 87      
Gross Amount Carried at December 31, 2017 4,823      
Accumulated Depreciation (941)      
Walgreens [Member] | Chicago, IL 2 [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,617      
Buildings, Fixtures and Improvements 3,003      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,620      
Accumulated Depreciation (893)      
Walgreens [Member] | Chicago, IL 3 [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 952      
Buildings, Fixtures and Improvements 3,235      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,187      
Accumulated Depreciation (687)      
Walgreens [Member] | Tulsa, OK [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,147      
Buildings, Fixtures and Improvements 2,904      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,051      
Accumulated Depreciation (629)      
Walgreens [Member] | North Charleston, SC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 3,379      
Land 1,320      
Buildings, Fixtures and Improvements 3,081      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,401      
Accumulated Depreciation (974)      
Walgreens [Member] | Memphis, TN [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 896      
Buildings, Fixtures and Improvements 2,687      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,583      
Accumulated Depreciation (823)      
Walgreens [Member] | Houston, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 491      
Buildings, Fixtures and Improvements 1,965      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,456      
Accumulated Depreciation (495)      
Walgreens [Member] | Birmingham, AL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 1,509      
Land 996      
Buildings, Fixtures and Improvements 3,005      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,001      
Accumulated Depreciation (700)      
Walgreens [Member] | Wetumpka, AL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 547      
Buildings, Fixtures and Improvements 3,102      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,649      
Accumulated Depreciation (1,012)      
Walgreens [Member] | Kingman, AZ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 2,902      
Land 669      
Buildings, Fixtures and Improvements 5,726      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 6,395      
Accumulated Depreciation (1,230)      
Walgreens [Member] | Phoenix, AZ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,037      
Buildings, Fixtures and Improvements 1,927      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,964      
Accumulated Depreciation (554)      
Walgreens [Member] | Tucson, AZ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,234      
Buildings, Fixtures and Improvements 5,143      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 6,377      
Accumulated Depreciation (1,102)      
Walgreens [Member] | Tucson, AZ 2 [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 2,910      
Land 1,406      
Buildings, Fixtures and Improvements 3,571      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,977      
Accumulated Depreciation (782)      
Walgreens [Member] | Coalinga, CA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 2,800      
Land 396      
Buildings, Fixtures and Improvements 3,568      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,964      
Accumulated Depreciation (1,200)      
Walgreens [Member] | Lancaster, CA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 2,719      
Land 859      
Buildings, Fixtures and Improvements 4,246      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 5,105      
Accumulated Depreciation (996)      
Walgreens [Member] | Castle Rock, CO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 3,953      
Land 1,581      
Buildings, Fixtures and Improvements 3,689      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 5,270      
Accumulated Depreciation (987)      
Walgreens [Member] | Denver, CO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 3,350      
Land 0      
Buildings, Fixtures and Improvements 4,050      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,050      
Accumulated Depreciation (1,083)      
Walgreens [Member] | Pueblo, CO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 519      
Buildings, Fixtures and Improvements 2,971      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,490      
Accumulated Depreciation (645)      
Walgreens [Member] | Orlando, FL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,007      
Buildings, Fixtures and Improvements 1,869      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,876      
Accumulated Depreciation (481)      
Walgreens [Member] | Acworth, GA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,583      
Buildings, Fixtures and Improvements 2,940      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,523      
Accumulated Depreciation (875)      
Walgreens [Member] | Decatur, GA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,746      
Buildings, Fixtures and Improvements 3,337      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 5,083      
Accumulated Depreciation (724)      
Walgreens [Member] | Grayson, GA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 2,720      
Land 947      
Buildings, Fixtures and Improvements 3,747      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,694      
Accumulated Depreciation (800)      
Walgreens [Member] | Union City, GA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 909      
Buildings, Fixtures and Improvements 3,841      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,750      
Accumulated Depreciation (818)      
Walgreens [Member] | Dubuque, IA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 638      
Buildings, Fixtures and Improvements 3,905      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,543      
Accumulated Depreciation (830)      
Walgreens [Member] | Twin Falls, ID [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 2,355      
Land 1,156      
Buildings, Fixtures and Improvements 3,896      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 5,052      
Accumulated Depreciation (871)      
Walgreens [Member] | Cahokia, IL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 394      
Buildings, Fixtures and Improvements 1,577      
Costs Capitalized Subsequent to Acquisition 167      
Gross Amount Carried at December 31, 2017 2,138      
Accumulated Depreciation (417)      
Walgreens [Member] | Chicago, IL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,212      
Buildings, Fixtures and Improvements 2,829      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,041      
Accumulated Depreciation (842)      
Walgreens [Member] | Chicago, IL 4 [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 911      
Buildings, Fixtures and Improvements 4,830      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 5,741      
Accumulated Depreciation (1,000)      
Walgreens [Member] | Machesney Park, IL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 822      
Buildings, Fixtures and Improvements 3,727      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,549      
Accumulated Depreciation (809)      
Walgreens [Member] | Matteson, IL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 2,450      
Land 416      
Buildings, Fixtures and Improvements 4,070      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,486      
Accumulated Depreciation (829)      
Walgreens [Member] | South Elgin, IL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 2,189      
Land 1,710      
Buildings, Fixtures and Improvements 3,208      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,918      
Accumulated Depreciation (709)      
Walgreens [Member] | St. Charles, IL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 1,964      
Land 1,472      
Buildings, Fixtures and Improvements 3,262      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,734      
Accumulated Depreciation (691)      
Walgreens [Member] | Anderson, IN [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 807      
Buildings, Fixtures and Improvements 3,227      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,034      
Accumulated Depreciation (1,012)      
Walgreens [Member] | Lafayette, IN [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 2,350      
Land 626      
Buildings, Fixtures and Improvements 4,183      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,809      
Accumulated Depreciation (801)      
Walgreens [Member] | South Bend, IN [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 3,022      
Land 1,240      
Buildings, Fixtures and Improvements 5,014      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 6,254      
Accumulated Depreciation (1,112)      
Walgreens [Member] | Frankfort, KY [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 911      
Buildings, Fixtures and Improvements 3,643      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,554      
Accumulated Depreciation (1,189)      
Walgreens [Member] | Shereveport, LA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 619      
Buildings, Fixtures and Improvements 3,509      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,128      
Accumulated Depreciation (1,145)      
Walgreens [Member] | Framingham, MA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 2,951      
Land 2,103      
Buildings, Fixtures and Improvements 4,770      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 6,873      
Accumulated Depreciation (1,005)      
Walgreens [Member] | Baltimore, MD [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,185      
Buildings, Fixtures and Improvements 2,764      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,949      
Accumulated Depreciation (726)      
Walgreens [Member] | Brooklyn Park, MD [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,416      
Buildings, Fixtures and Improvements 4,160      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 5,576      
Accumulated Depreciation (874)      
Walgreens [Member] | Augusta, ME [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 3,058      
Land 1,648      
Buildings, Fixtures and Improvements 5,146      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 6,794      
Accumulated Depreciation (1,157)      
Walgreens [Member] | Clarkston, MI [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 2,768      
Buildings, Fixtures and Improvements 3,197      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 5,965      
Accumulated Depreciation (699)      
Walgreens [Member] | Clinton, MI [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,463      
Buildings, Fixtures and Improvements 3,413      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,876      
Accumulated Depreciation (1,037)      
Walgreens [Member] | Dearborn Heights, MI [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 190      
Buildings, Fixtures and Improvements 3,605      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,795      
Accumulated Depreciation (1,018)      
Walgreens [Member] | Eastpointe, MI [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 668      
Buildings, Fixtures and Improvements 2,672      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,340      
Accumulated Depreciation (878)      
Walgreens [Member] | Lincoln Park, MI [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 5,494      
Land 1,041      
Buildings, Fixtures and Improvements 5,896      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 6,937      
Accumulated Depreciation (1,850)      
Walgreens [Member] | Livonia, MI [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 261      
Buildings, Fixtures and Improvements 2,350      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 2,611      
Accumulated Depreciation (664)      
Walgreens [Member] | Stevensville, MI [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 3,099      
Land 855      
Buildings, Fixtures and Improvements 3,420      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,275      
Accumulated Depreciation (1,141)      
Walgreens [Member] | Troy, MI [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 0      
Buildings, Fixtures and Improvements 1,896      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 1,896      
Accumulated Depreciation (571)      
Walgreens [Member] | Warren, MI [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 748      
Buildings, Fixtures and Improvements 2,990      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,738      
Accumulated Depreciation (908)      
Walgreens [Member] | North Mankato, MN [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 2,451      
Land 1,748      
Buildings, Fixtures and Improvements 3,604      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 5,352      
Accumulated Depreciation (795)      
Walgreens [Member] | Country Club Hill, MO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 997      
Buildings, Fixtures and Improvements 4,204      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 5,201      
Accumulated Depreciation (841)      
Walgreens [Member] | Columbia, MS [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 452      
Buildings, Fixtures and Improvements 4,072      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,524      
Accumulated Depreciation (1,227)      
Walgreens [Member] | Greenwood, MS [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 561      
Buildings, Fixtures and Improvements 3,181      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,742      
Accumulated Depreciation (1,038)      
Walgreens [Member] | Cape Carteret, NC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 2,400      
Land 919      
Buildings, Fixtures and Improvements 3,087      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,006      
Accumulated Depreciation (667)      
Walgreens [Member] | Durham, NC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 2,871      
Land 1,441      
Buildings, Fixtures and Improvements 3,581      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 5,022      
Accumulated Depreciation (863)      
Walgreens [Member] | Durham, NC 2 [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 2,760      
Land 2,201      
Buildings, Fixtures and Improvements 2,923      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 5,124      
Accumulated Depreciation (765)      
Walgreens [Member] | Laurinburg, NC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 355      
Buildings, Fixtures and Improvements 3,577      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 3,932      
Accumulated Depreciation (819)      
Walgreens [Member] | Leland, NC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 2,472      
Land 1,226      
Buildings, Fixtures and Improvements 3,681      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,907      
Accumulated Depreciation (818)      
Walgreens [Member] | Rocky Mount, NC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 2,899      
Land 1,105      
Buildings, Fixtures and Improvements 4,046      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 5,151      
Accumulated Depreciation (994)      
Walgreens [Member] | Winterville, NC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 2,931      
Land 578      
Buildings, Fixtures and Improvements 5,322      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 5,900      
Accumulated Depreciation (1,214)      
Walgreens [Member] | North Platte, NE [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 935      
Buildings, Fixtures and Improvements 4,291      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 5,226      
Accumulated Depreciation (958)      
Walgreens [Member] | Omaha, NE [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 2,496      
Land 1,316      
Buildings, Fixtures and Improvements 4,122      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 5,438      
Accumulated Depreciation (910)      
Walgreens [Member] | Papillion, NE [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 0      
Land 1,239      
Buildings, Fixtures and Improvements 3,212      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 4,451      
Accumulated Depreciation (696)      
Walgreens [Member] | Maplewood, NJ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances at December 31, 2017 4,700      
Land 1,071      
Buildings, Fixtures and Improvements 6,071      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amount Carried at December 31, 2017 7,142      
Accumulated Depreciation $ (2,026)