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Schedule III - Real Estate and Accumulated Depreciation and Amortization - Schedule III (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 570,420      
Land and Land Estates 341,848      
Buildings and Improvements 2,746,446      
Total 3,090,134 $ 3,936,459 $ 3,533,172 $ 3,789,711
Accumulated Depreciation and Amortization 722,644 890,969 $ 844,931 $ 812,207
Construction in progress 1,840 $ 4,219    
Unamortized debt issuance costs $ (5,094)      
Building and Improvements [Member] | Maximum [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Useful life computing depreciation in latest income statement (years) 40 years      
Land Estates [Member] | Maximum [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Useful life computing depreciation in latest income statement (years) 51 years      
Office Building [Member] | Glendale, Arizona [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land and Land Estates 9,418      
Buildings and Improvements 8,394      
Total 17,812      
Accumulated Depreciation and Amortization 4,229      
Office Building [Member] | Tempe, Arizona [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 0      
Buildings and Improvements 13,086      
Total 13,086      
Accumulated Depreciation and Amortization 3,035      
Office Building [Member] | Tucson, Arizona [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 681      
Buildings and Improvements 4,037      
Total 4,718      
Accumulated Depreciation and Amortization 1,103      
Office Building [Member] | Palo Alto, California [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 32,188      
Land and Land Estates 12,398      
Buildings and Improvements 16,977      
Total 29,375      
Accumulated Depreciation and Amortization 23,153      
Office Building [Member] | Boca Raton, Florida [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 18,785      
Land and Land Estates 4,290      
Buildings and Improvements 17,160      
Total 21,450      
Accumulated Depreciation and Amortization 6,811      
Office Building [Member] | Orlando, Florida [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,538      
Buildings and Improvements 9,353      
Total 12,891      
Accumulated Depreciation and Amortization 6,908      
Office Building [Member] | McDonough, Georgia [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 693      
Buildings and Improvements 6,405      
Total 7,098      
Accumulated Depreciation and Amortization 1,601      
Office Building [Member] | Meridian, Idaho [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,255      
Buildings and Improvements 8,144      
Total 10,399      
Accumulated Depreciation and Amortization 2,555      
Office Building [Member] | Columbus, Indiana [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 7,301      
Land and Land Estates 235      
Buildings and Improvements 45,729      
Total 45,964      
Accumulated Depreciation and Amortization 37,145      
Office Building [Member] | Indianapolis, Indiana [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,700      
Buildings and Improvements 18,719      
Total 20,419      
Accumulated Depreciation and Amortization 14,193      
Office Building [Member] | Lenexa, Kansas [Member] | Lenexa, KS Office Acquired Sep-12 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 8,153      
Land and Land Estates 2,828      
Buildings and Improvements 6,075      
Total 8,903      
Accumulated Depreciation and Amortization 1,827      
Office Building [Member] | Lenexa, Kansas [Member] | Lenexa, KS Office Acquired Jul-08 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 31,698      
Land and Land Estates 6,909      
Buildings and Improvements 41,966      
Total 48,875      
Accumulated Depreciation and Amortization 15,556      
Office Building [Member] | Baton Rouge, Louisiana [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,252      
Buildings and Improvements 11,926      
Total 13,178      
Accumulated Depreciation and Amortization 5,187      
Office Building [Member] | Oakland, Maine [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 8,138      
Land and Land Estates 551      
Buildings and Improvements 8,774      
Total 9,325      
Accumulated Depreciation and Amortization 2,282      
Office Building [Member] | Auburn Hill, Michigan [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 4,416      
Buildings and Improvements 30,012      
Total 34,428      
Accumulated Depreciation and Amortization 5,573      
Office Building [Member] | Kansas City, Missouri [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 15,272      
Land and Land Estates 1,525      
Buildings and Improvements 7,691      
Total 9,216      
Accumulated Depreciation and Amortization 209      
Office Building [Member] | Pascagoula, Mississippi [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 618      
Buildings and Improvements 3,677      
Total 4,295      
Accumulated Depreciation and Amortization 1,009      
Office Building [Member] | Wall, New Jersey [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 8,847      
Land and Land Estates 8,985      
Buildings and Improvements 26,961      
Total 35,946      
Accumulated Depreciation and Amortization 15,722      
Office Building [Member] | Whippany, New Jersey [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 12,156      
Land and Land Estates 4,063      
Buildings and Improvements 19,711      
Total 23,774      
Accumulated Depreciation and Amortization 9,828      
Office Building [Member] | Redmond, Oregon [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,064      
Buildings and Improvements 8,316      
Total 10,380      
Accumulated Depreciation and Amortization 2,272      
Office Building [Member] | Philadelphia, Pennsylvania [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 13,209      
Buildings and Improvements 61,011      
Total 74,220      
Accumulated Depreciation and Amortization 43,083      
Office Building [Member] | Florence, South Carolina [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 774      
Buildings and Improvements 3,629      
Total 4,403      
Accumulated Depreciation and Amortization 727      
Office Building [Member] | Fort Mill, South Carolina [Member] | Fort Mill, SC Office, Acquired Dec-02 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,601      
Buildings and Improvements 16,306      
Total 19,907      
Accumulated Depreciation and Amortization 6,290      
Office Building [Member] | Fort Mill, South Carolina [Member] | Fort Mill, SC Office, Acquired Nov-04 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,798      
Buildings and Improvements 26,947      
Total 28,745      
Accumulated Depreciation and Amortization 19,565      
Office Building [Member] | Knoxville, Tennessee [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 621      
Buildings and Improvements 6,487      
Total 7,108      
Accumulated Depreciation and Amortization 1,643      
Office Building [Member] | Arlington, Texas [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,274      
Buildings and Improvements 15,309      
Total 16,583      
Accumulated Depreciation and Amortization 3,489      
Office Building [Member] | Houston, Texas [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,875      
Buildings and Improvements 10,959      
Total 12,834      
Accumulated Depreciation and Amortization 8,345      
Office Building [Member] | Lake Jackson, Texas [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 187,980      
Land and Land Estates 7,435      
Buildings and Improvements 141,436      
Total 148,871      
Accumulated Depreciation and Amortization 12,105      
Office Building [Member] | Mission, Texas [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,556      
Buildings and Improvements 2,911      
Total 5,467      
Accumulated Depreciation and Amortization 1,038      
Office Building [Member] | Westlake, Texas [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,361      
Buildings and Improvements 26,631      
Total 28,992      
Accumulated Depreciation and Amortization 13,421      
Office Building [Member] | Herndon, Virginia [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 5,127      
Buildings and Improvements 25,293      
Total 30,420      
Accumulated Depreciation and Amortization 11,353      
Office Building, Multi-tenant/vacant properties [Member] | Phoenix, Arizona [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,096      
Buildings and Improvements 6,193      
Total 7,289      
Accumulated Depreciation and Amortization 229      
Office Building, Multi-tenant/vacant properties [Member] | Overland Park, Kansas [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 32,112      
Land and Land Estates 2,025      
Buildings and Improvements 10,976      
Total 13,001      
Accumulated Depreciation and Amortization 4,242      
Office Building, Multi-tenant/vacant properties [Member] | Charleston, South Carolina [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 6,878      
Land and Land Estates 1,189      
Buildings and Improvements 9,419      
Total 10,608      
Accumulated Depreciation and Amortization 4,651      
Office Building, Multi-tenant/vacant properties [Member] | Farmers Branch, Texas [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,984      
Buildings and Improvements 32,842      
Total 36,826      
Accumulated Depreciation and Amortization 14,111      
Office Building, Multi-tenant/vacant properties [Member] | Houston, Texas [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 800      
Buildings and Improvements 27,667      
Total 28,467      
Accumulated Depreciation and Amortization 21,686      
Industrial Property [Member] | Anniston, Alabama [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,201      
Buildings and Improvements 16,771      
Total 17,972      
Accumulated Depreciation and Amortization 3,159      
Industrial Property [Member] | Moody, Alabama [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 654      
Buildings and Improvements 9,943      
Total 10,597      
Accumulated Depreciation and Amortization 7,757      
Industrial Property [Member] | Opelika, Alabama [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 134      
Buildings and Improvements 31,734      
Total 31,868      
Accumulated Depreciation and Amortization 1,952      
Industrial Property [Member] | Goodyear, Arizona [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 5,247      
Buildings and Improvements 36,115      
Total 41,362      
Accumulated Depreciation and Amortization 138      
Industrial Property [Member] | Orlando, Florida [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,030      
Buildings and Improvements 10,869      
Total 11,899      
Accumulated Depreciation and Amortization 3,678      
Industrial Property [Member] | Tampa, Florida [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,160      
Buildings and Improvements 8,526      
Total 10,686      
Accumulated Depreciation and Amortization 6,723      
Industrial Property [Member] | Lavonia, Georgia [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 6,647      
Land and Land Estates 171      
Buildings and Improvements 7,657      
Total 7,828      
Accumulated Depreciation and Amortization 1,371      
Industrial Property [Member] | McDonough, Georgia [Member] | McDonough, GA Industrial Acquired Aug-17 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 5,441      
Buildings and Improvements 52,762      
Total 58,203      
Accumulated Depreciation and Amortization 3,101      
Industrial Property [Member] | McDonough, Georgia [Member] | McDonough, GA Industrial Acquired Dec-06 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,463      
Buildings and Improvements 24,811      
Total 27,274      
Accumulated Depreciation and Amortization 7,820      
Industrial Property [Member] | Thomson, Georgia [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 909      
Buildings and Improvements 7,746      
Total 8,655      
Accumulated Depreciation and Amortization 1,368      
Industrial Property [Member] | Edwardsville, Illinois [Member] | Edwardsville, IL Industrial Acquired Dec-16 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 4,593      
Buildings and Improvements 34,362      
Total 38,955      
Accumulated Depreciation and Amortization 2,838      
Industrial Property [Member] | Edwardsville, Illinois [Member] | Edwardsville, IL Industrial Acquired Jun- 18 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,649      
Buildings and Improvements 41,310      
Total 44,959      
Accumulated Depreciation and Amortization 932      
Industrial Property [Member] | Rantoul, Illinois [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,304      
Buildings and Improvements 32,562      
Total 33,866      
Accumulated Depreciation and Amortization 4,473      
Industrial Property [Member] | Rockford, Illinois [Member] | Rockford, IL Industrial Acquired Dec-06 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 371      
Buildings and Improvements 2,619      
Total 2,990      
Accumulated Depreciation and Amortization 861      
Industrial Property [Member] | Rockford, Illinois [Member] | Rockford, IL Industrial Acquired Dec-06, Property 2 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 509      
Buildings and Improvements 5,289      
Total 5,798      
Accumulated Depreciation and Amortization 1,740      
Industrial Property [Member] | Romeoville, Illinois [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 7,524      
Buildings and Improvements 40,167      
Total 47,691      
Accumulated Depreciation and Amortization 3,458      
Industrial Property [Member] | Lafayette, Indiana [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 662      
Buildings and Improvements 15,578      
Total 16,240      
Accumulated Depreciation and Amortization 1,000      
Industrial Property [Member] | Lebanon, Indiana [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,100      
Buildings and Improvements 29,443      
Total 31,543      
Accumulated Depreciation and Amortization 2,317      
Industrial Property [Member] | New Century, Kansas [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 0      
Buildings and Improvements 13,198      
Total 13,198      
Accumulated Depreciation and Amortization 1,079      
Industrial Property [Member] | Dry Ridge, Kentucky [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 560      
Buildings and Improvements 12,553      
Total 13,113      
Accumulated Depreciation and Amortization 5,889      
Industrial Property [Member] | Elizabethtown, Kentucky [Member] | Elizabethtown, KY Industrial Acquired Jun-05 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 352      
Buildings and Improvements 4,862      
Total 5,214      
Accumulated Depreciation and Amortization 2,281      
Industrial Property [Member] | Elizabethtown, Kentucky [Member] | Elizabethtown, KY Industrial Acquired Jun-05, Property 2 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 890      
Buildings and Improvements 26,868      
Total 27,758      
Accumulated Depreciation and Amortization 12,605      
Industrial Property [Member] | Hopkinsville, Kentucky [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 631      
Buildings and Improvements 16,154      
Total 16,785      
Accumulated Depreciation and Amortization 8,063      
Industrial Property [Member] | Owensboro, Kentucky [Member] | Owensboro, KY Industrial Acquired Jun-05 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 393      
Buildings and Improvements 11,956      
Total 12,349      
Accumulated Depreciation and Amortization 6,474      
Industrial Property [Member] | Owensboro, Kentucky [Member] | Owensboro, KY Industrial Acquired Dec-06 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 819      
Buildings and Improvements 2,439      
Total 3,258      
Accumulated Depreciation and Amortization 1,092      
Industrial Property [Member] | Shreveport, Louisiana [Member] | Shreveport, LA Industrial Acquired Mar-07 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 860      
Buildings and Improvements 21,840      
Total 22,700      
Accumulated Depreciation and Amortization 6,438      
Industrial Property [Member] | Shreveport, Louisiana [Member] | Shreveport, LA Industrial Acquired Jun-12 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,078      
Buildings and Improvements 10,134      
Total 11,212      
Accumulated Depreciation and Amortization 2,423      
Industrial Property [Member] | North Berwick, Maine [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 381      
Land and Land Estates 1,383      
Buildings and Improvements 35,659      
Total 37,042      
Accumulated Depreciation and Amortization 10,660      
Industrial Property [Member] | Detroit, Michigan [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,133      
Buildings and Improvements 25,009      
Total 26,142      
Accumulated Depreciation and Amortization 3,903      
Industrial Property [Member] | Kalamazoo, Michigan [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,942      
Buildings and Improvements 14,169      
Total 16,111      
Accumulated Depreciation and Amortization 3,606      
Industrial Property [Member] | Marshall, Michigan [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 143      
Buildings and Improvements 4,302      
Total 4,445      
Accumulated Depreciation and Amortization 2,884      
Industrial Property [Member] | Plymouth, Michigan [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,296      
Buildings and Improvements 15,795      
Total 18,091      
Accumulated Depreciation and Amortization 6,497      
Industrial Property [Member] | Romulus, Michigan [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,438      
Buildings and Improvements 33,786      
Total 36,224      
Accumulated Depreciation and Amortization 2,069      
Industrial Property [Member] | Warren, Michigan [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 25,850      
Land and Land Estates 972      
Buildings and Improvements 42,521      
Total 43,493      
Accumulated Depreciation and Amortization 2,073      
Industrial Property [Member] | Minneapolis, Minnesota [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,886      
Buildings and Improvements 1,922      
Total 3,808      
Accumulated Depreciation and Amortization 381      
Industrial Property [Member] | Byhalia, Mississippi [Member] | Byhalia, MS Industrial Property Acquired May-11 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,006      
Buildings and Improvements 35,795      
Total 36,801      
Accumulated Depreciation and Amortization 6,241      
Industrial Property [Member] | Byhalia, Mississippi [Member] | Byhalia, MS Industrial Property Acquired Sep-17 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,751      
Buildings and Improvements 31,236      
Total 32,987      
Accumulated Depreciation and Amortization 2,274      
Industrial Property [Member] | Canton, Mississippi [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 5,077      
Buildings and Improvements 71,289      
Total 76,366      
Accumulated Depreciation and Amortization 12,950      
Industrial Property [Member] | Olive Branch, Mississippi [Member] | Olive Branch, MS Industrial Acquired Apr- 18 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,500      
Buildings and Improvements 42,538      
Total 45,038      
Accumulated Depreciation and Amortization 1,471      
Industrial Property [Member] | Olive Branch, Mississippi [Member] | Olive Branch, MS Industrial Acquired Dec- 04 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 198      
Buildings and Improvements 10,276      
Total 10,474      
Accumulated Depreciation and Amortization 7,539      
Industrial Property [Member] | Olive Branch, Mississippi [Member] | Olive Branch, MS Industrial Acquired Apr- 18, Property 2 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,958      
Buildings and Improvements 38,687      
Total 40,645      
Accumulated Depreciation and Amortization 1,342      
Industrial Property [Member] | Lumberton, North Carolina [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 405      
Buildings and Improvements 12,049      
Total 12,454      
Accumulated Depreciation and Amortization 4,651      
Industrial Property [Member] | Shelby, North Carolina [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,421      
Buildings and Improvements 18,862      
Total 20,283      
Accumulated Depreciation and Amortization 5,300      
Industrial Property [Member] | Statesville, North Carolina [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 891      
Buildings and Improvements 16,771      
Total 17,662      
Accumulated Depreciation and Amortization 5,751      
Industrial Property [Member] | Durham, New Hampshire [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,464      
Buildings and Improvements 18,094      
Total 21,558      
Accumulated Depreciation and Amortization 7,002      
Industrial Property [Member] | North Las Vegas, Nevada [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,244      
Buildings and Improvements 21,732      
Total 24,976      
Accumulated Depreciation and Amortization 2,949      
Industrial Property [Member] | Erwin, New York [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,648      
Buildings and Improvements 12,514      
Total 14,162      
Accumulated Depreciation and Amortization 2,977      
Industrial Property [Member] | Long Island City, New York [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 39,994      
Land and Land Estates 0      
Buildings and Improvements 42,759      
Total 42,759      
Accumulated Depreciation and Amortization 16,584      
Industrial Property [Member] | Chillicothe, Ohio [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 735      
Buildings and Improvements 9,021      
Total 9,756      
Accumulated Depreciation and Amortization 3,076      
Industrial Property [Member] | Cincinnati, Ohio [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,049      
Buildings and Improvements 8,784      
Total 9,833      
Accumulated Depreciation and Amortization 3,075      
Industrial Property [Member] | Columbus, Ohio [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,990      
Buildings and Improvements 10,767      
Total 12,757      
Accumulated Depreciation and Amortization 4,194      
Industrial Property [Member] | Glenwillow, Ohio [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,228      
Buildings and Improvements 24,530      
Total 26,758      
Accumulated Depreciation and Amortization 7,774      
Industrial Property [Member] | Hebron, Ohio [Member] | Hebron, OH Industrial, Acquired Dec-97 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,063      
Buildings and Improvements 4,947      
Total 6,010      
Accumulated Depreciation and Amortization 2,013      
Industrial Property [Member] | Hebron, Ohio [Member] | Hebron, OH Industrial, Acquired Dec-01 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,681      
Buildings and Improvements 8,179      
Total 9,860      
Accumulated Depreciation and Amortization 3,606      
Industrial Property [Member] | Streetsboro, Ohio [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 16,565      
Land and Land Estates 2,441      
Buildings and Improvements 25,282      
Total 27,723      
Accumulated Depreciation and Amortization 9,629      
Industrial Property [Member] | Wilsonville, Oregon [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 6,815      
Buildings and Improvements 32,380      
Total 39,195      
Accumulated Depreciation and Amortization 3,188      
Industrial Property [Member] | Bristol, Pennsylvania [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,508      
Buildings and Improvements 15,863      
Total 18,371      
Accumulated Depreciation and Amortization 7,694      
Industrial Property [Member] | Chester, South Carolina [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 6,569      
Land and Land Estates 1,629      
Buildings and Improvements 8,470      
Total 10,099      
Accumulated Depreciation and Amortization 1,959      
Industrial Property [Member] | Laurens, South Carolina [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 5,552      
Buildings and Improvements 21,908      
Total 27,460      
Accumulated Depreciation and Amortization 7,834      
Industrial Property [Member] | Spartanburg, South Carolina [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,447      
Buildings and Improvements 23,744      
Total 25,191      
Accumulated Depreciation and Amortization 426      
Industrial Property [Member] | Cleveland, Tennessee [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,871      
Buildings and Improvements 29,743      
Total 31,614      
Accumulated Depreciation and Amortization 2,163      
Industrial Property [Member] | Crossville, Tennessee [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 545      
Buildings and Improvements 6,999      
Total 7,544      
Accumulated Depreciation and Amortization 4,571      
Industrial Property [Member] | Franklin, Tennessee [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 0      
Buildings and Improvements 5,673      
Total 5,673      
Accumulated Depreciation and Amortization 3,057      
Industrial Property [Member] | Jackson, Tennessee [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,454      
Buildings and Improvements 49,026      
Total 50,480      
Accumulated Depreciation and Amortization 2,624      
Industrial Property [Member] | Lewisburg, Tennessee [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 173      
Buildings and Improvements 10,865      
Total 11,038      
Accumulated Depreciation and Amortization 1,583      
Industrial Property [Member] | Memphis, Tennessee [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,054      
Buildings and Improvements 11,538      
Total 12,592      
Accumulated Depreciation and Amortization 11,487      
Industrial Property [Member] | Millington, Tennessee [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 723      
Buildings and Improvements 19,383      
Total 20,106      
Accumulated Depreciation and Amortization 12,951      
Industrial Property [Member] | Smyrna, Tennessee [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,793      
Buildings and Improvements 93,940      
Total 95,733      
Accumulated Depreciation and Amortization 5,154      
Industrial Property [Member] | Arlington, Texas [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 589      
Buildings and Improvements 7,739      
Total 8,328      
Accumulated Depreciation and Amortization 1,604      
Industrial Property [Member] | Brookshire, Texas [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,388      
Buildings and Improvements 16,614      
Total 19,002      
Accumulated Depreciation and Amortization 2,915      
Industrial Property [Member] | Carrollton, Texas [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,228      
Buildings and Improvements 15,769      
Total 18,997      
Accumulated Depreciation and Amortization 330      
Industrial Property [Member] | Grand Prairie, Texas [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,166      
Buildings and Improvements 17,985      
Total 21,151      
Accumulated Depreciation and Amortization 1,170      
Industrial Property [Member] | Houston, Texas [Member] | Houston, TX Industrial Acquired Mar-15 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 4,674      
Buildings and Improvements 19,540      
Total 24,214      
Accumulated Depreciation and Amortization 8,016      
Industrial Property [Member] | Houston, Texas [Member] | Houston, TX Industrial Acquired Mar-13 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 15,055      
Buildings and Improvements 57,949      
Total 73,004      
Accumulated Depreciation and Amortization 10,371      
Industrial Property [Member] | Missouri City, Texas [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 14,555      
Buildings and Improvements 5,895      
Total 20,450      
Accumulated Depreciation and Amortization 5,615      
Industrial Property [Member] | Pasadena, Texas [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 4,057      
Buildings and Improvements 17,810      
Total 21,867      
Accumulated Depreciation and Amortization 271      
Industrial Property [Member] | San Antonio, Texas [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,311      
Buildings and Improvements 36,644      
Total 37,955      
Accumulated Depreciation and Amortization 2,364      
Industrial Property [Member] | Chester, Virginia [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 8,544      
Buildings and Improvements 53,067      
Total 61,611      
Accumulated Depreciation and Amortization 220      
Industrial Property [Member] | Winchester, Virginia [Member] | Winchester, VA Industrial Acquired Dec-17 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,988      
Buildings and Improvements 32,536      
Total 34,524      
Accumulated Depreciation and Amortization 1,392      
Industrial Property [Member] | Winchester, Virginia [Member] | Winchester, VA Industrial Acquired Jun-07 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,823      
Buildings and Improvements 12,276      
Total 16,099      
Accumulated Depreciation and Amortization 4,311      
Industrial Property [Member] | Bingen, Washington [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 0      
Buildings and Improvements 18,075      
Total 18,075      
Accumulated Depreciation and Amortization 4,269      
Industrial Property [Member] | Richland, Washington [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 110,000      
Land and Land Estates 1,293      
Buildings and Improvements 126,947      
Total 128,240      
Accumulated Depreciation and Amortization 16,632      
Industrial Property [Member] | Oak Creek, Wisconsin [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,015      
Buildings and Improvements 15,300      
Total 18,315      
Accumulated Depreciation and Amortization 2,352      
Industrial properties, Multi-tenant/vacant properties [Member] | Plymouth, Indiana [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 254      
Buildings and Improvements 8,101      
Total 8,355      
Accumulated Depreciation and Amortization 1,816      
Industrial properties, Multi-tenant/vacant properties [Member] | Henderson, North Carolina [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,488      
Buildings and Improvements 5,953      
Total 7,441      
Accumulated Depreciation and Amortization 2,549      
Industrial properties, Multi-tenant/vacant properties [Member] | Duncan, South Carolina [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 884      
Buildings and Improvements 8,626      
Total 9,510      
Accumulated Depreciation and Amortization 2,604      
Industrial properties, Multi-tenant/vacant properties [Member] | Antioch, Tennessee [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,847      
Buildings and Improvements 12,659      
Total 16,506      
Accumulated Depreciation and Amortization 3,479      
Industrial properties, Multi-tenant/vacant properties [Member] | Memphis, Tennessee [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 0      
Buildings and Improvements 0      
Total 0      
Accumulated Depreciation and Amortization 0      
Other Property [Member] | Venice, Florida [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 4,696      
Buildings and Improvements 11,753      
Total 16,449      
Accumulated Depreciation and Amortization 9,071      
Other Property [Member] | Baltimore, Maryland [Member] | Baltimore, MD Other Acquired Dec-15 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 5,000      
Buildings and Improvements 0      
Total 5,000      
Accumulated Depreciation and Amortization 0      
Other Property [Member] | Baltimore, Maryland [Member] | Baltimore, MD Other Acquired Dec-06 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 4,605      
Buildings and Improvements 0      
Total 4,605      
Accumulated Depreciation and Amortization 0      
Other Property [Member] | Pataskala, Ohio [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,605      
Buildings and Improvements 0      
Total 3,605      
Accumulated Depreciation and Amortization 0      
Other Property [Member] | Lawton, Oklahoma [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 663      
Buildings and Improvements 1,288      
Total 1,951      
Accumulated Depreciation and Amortization 587      
Other Property [Member] | Paris, Tennessee [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 247      
Buildings and Improvements 547      
Total 794      
Accumulated Depreciation and Amortization 240      
Other Property [Member] | Danville, Virginia [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,454      
Buildings and Improvements 0      
Total 3,454      
Accumulated Depreciation and Amortization 0      
Other properties, Multi-tenant/vacant properties [Member] | Albany, Georgia [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 455      
Buildings and Improvements 1,206      
Total 1,661      
Accumulated Depreciation and Amortization 17      
Other properties, Multi-tenant/vacant properties [Member] | Honolulu, Hawaii [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 8,259      
Buildings and Improvements 7,414      
Total 15,673      
Accumulated Depreciation and Amortization 6,025      
Other properties, Multi-tenant/vacant properties [Member] | Watertown, New York [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 270      
Buildings and Improvements 2,333      
Total 2,603      
Accumulated Depreciation and Amortization 52      
Other properties, Multi-tenant/vacant properties [Member] | Fairlea, West Virginia [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 79      
Buildings and Improvements 216      
Total 295      
Accumulated Depreciation and Amortization $ 4