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Schedule III - Real Estate and Accumulated Depreciation and Amortization - Schedule III (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Real Estate and Accumulated Depreciation [Line Items]        
Land and Land Estates $ 367,272      
Buildings and Improvements 3,144,176      
Total 3,514,564 $ 3,320,574 $ 3,090,134 $ 3,936,459
Accumulated Depreciation and Amortization 684,468 $ 675,596 $ 722,644 $ 890,969
Deferred loan costs, net (1,883)      
Encumbrances, net of deferred loan costs $ 136,529      
Building and improvements | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Useful life computing depreciation in latest income statement (years) 40 years      
Land estates | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Useful life computing depreciation in latest income statement (years) 51 years      
Industrial Property | Anniston, Alabama        
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 4,738      
Industrial Property | Opelika, Alabama        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 142      
Buildings and Improvements 31,734      
Total 31,876      
Accumulated Depreciation and Amortization 4,608      
Industrial Property | Chandler, Arizona        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 10,733      
Buildings and Improvements 69,491      
Total 80,224      
Accumulated Depreciation and Amortization 538      
Industrial Property | Goodyear, Arizona | Goodyear, AZ Industrial Acquired Nov-18        
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 3,438      
Industrial Property | Goodyear, Arizona | Goodyear, AZ Industrial Acquired Nov-19        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 41,877      
Land and Land Estates 11,970      
Buildings and Improvements 48,925      
Total 60,895      
Accumulated Depreciation and Amortization 2,384      
Industrial Property | Goodyear, Arizona | Goodyear, AZ Industrial Acquired Jan-20        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,614      
Buildings and Improvements 16,222      
Total 17,836      
Accumulated Depreciation and Amortization 658      
Industrial Property | Tolleson, Arizona        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,311      
Buildings and Improvements 16,013      
Total 19,324      
Accumulated Depreciation and Amortization 883      
Industrial Property | Ocala, Florida        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 4,113      
Buildings and Improvements 49,936      
Total 54,049      
Accumulated Depreciation and Amortization 1,093      
Industrial Property | Orlando, Florida        
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 4,290      
Industrial Property | Tampa, Florida        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,160      
Buildings and Improvements 9,125      
Total 11,285      
Accumulated Depreciation and Amortization 7,342      
Industrial Property | Austell, Georgia        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,251      
Buildings and Improvements 48,459      
Total 51,710      
Accumulated Depreciation and Amortization 3,238      
Industrial Property | McDonough, Georgia | McDonough, GA Industrial Acquired Aug-17        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 5,441      
Buildings and Improvements 52,790      
Total 58,231      
Accumulated Depreciation and Amortization 7,485      
Industrial Property | McDonough, Georgia | McDonough, GA Industrial Acquired Feb-19        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,253      
Buildings and Improvements 30,956      
Total 34,209      
Accumulated Depreciation and Amortization 2,587      
Industrial Property | McDonough, Georgia | McDonough, GA Industrial Acquired Dec-06        
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 9,085      
Industrial Property | Pooler, Georgia        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,690      
Buildings and Improvements 30,346      
Total 32,036      
Accumulated Depreciation and Amortization 999      
Industrial Property | Savannah, Georgia | Savannah, GA, Industrial Property Acquired Jun-20        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,560      
Buildings and Improvements 25,717      
Total 28,277      
Accumulated Depreciation and Amortization 645      
Industrial Property | Savannah, Georgia | Savannah, GA, Industrial Property Acquired Jun-20, Property 2        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,070      
Buildings and Improvements 7,458      
Total 8,528      
Accumulated Depreciation and Amortization 187      
Industrial Property | Savannah, Georgia | Savannah, GA, Industrial Property Acquired Sept-20        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,775      
Buildings and Improvements 34,325      
Total 38,100      
Accumulated Depreciation and Amortization 379      
Industrial Property | Union City, Georgia        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,536      
Buildings and Improvements 22,830      
Total 25,366      
Accumulated Depreciation and Amortization 1,512      
Industrial Property | Edwardsville, Illinois | Edwardsville, IL Industrial Acquired Dec-16        
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 5,697      
Industrial Property | Edwardsville, Illinois | Edwardsville, IL Industrial Acquired Jun- 18        
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 4,660      
Industrial Property | Minooka, Illinois | Minooka, Illinois, Industrial Property Acquired Jan-20        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,788      
Buildings and Improvements 34,301      
Total 36,089      
Accumulated Depreciation and Amortization 1,314      
Industrial Property | Minooka, Illinois | Minooka, Illinois, Industrial Property Acquired Dec-19        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,432      
Buildings and Improvements 40,949      
Total 44,381      
Accumulated Depreciation and Amortization 1,775      
Industrial Property | Minooka, Illinois | Minooka, Illinois, Industrial Property Acquired Jan-20, Property 2        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,681      
Buildings and Improvements 45,817      
Total 49,498      
Accumulated Depreciation and Amortization 1,936      
Industrial Property | Rantoul, Illinois        
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 6,263      
Industrial Property | Rockford, Illinois | Rockford, IL Industrial Acquired Dec-06        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 371      
Buildings and Improvements 2,647      
Total 3,018      
Accumulated Depreciation and Amortization 1,021      
Industrial Property | Rockford, Illinois | Rockford, IL Industrial Acquired Dec-06, Property 2        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 509      
Buildings and Improvements 5,921      
Total 6,430      
Accumulated Depreciation and Amortization 2,077      
Industrial Property | Romeoville, Illinois        
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 6,778      
Industrial Property | Lafayette, Indiana        
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 2,600      
Industrial Property | Lebanon, Indiana        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,100      
Buildings and Improvements 29,907      
Total 32,007      
Accumulated Depreciation and Amortization 4,747      
Industrial Property | Whitestown, Indiana        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,954      
Buildings and Improvements 16,821      
Total 18,775      
Accumulated Depreciation and Amortization 1,437      
Industrial Property | New Century, Kansas        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 0      
Buildings and Improvements 13,330      
Total 13,330      
Accumulated Depreciation and Amortization 2,286      
Industrial Property | Dry Ridge, Kentucky        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 568      
Buildings and Improvements 12,553      
Total 13,121      
Accumulated Depreciation and Amortization 6,761      
Industrial Property | Elizabethtown, Kentucky | Elizabethtown, KY Industrial Acquired Jun-05        
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 14,472      
Industrial Property | Elizabethtown, Kentucky | Elizabethtown, KY Industrial Acquired Jun-05, Property 2        
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 2,619      
Industrial Property | Hopkinsville, Kentucky        
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 9,283      
Industrial Property | Owensboro, Kentucky | Owensboro, KY Industrial Acquired Jun-05        
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 7,468      
Industrial Property | Owensboro, Kentucky | Owensboro, KY Industrial Acquired Dec-06        
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 1,247      
Industrial Property | Shreveport, Louisiana | Shreveport, LA Industrial Acquired Jun-12        
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 3,121      
Industrial Property | Shreveport, Louisiana | Shreveport, LA Industrial Acquired Mar-07        
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 7,531      
Industrial Property | North Berwick, Maine        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,383      
Buildings and Improvements 35,659      
Total 37,042      
Accumulated Depreciation and Amortization 12,526      
Industrial Property | Detroit, Michigan        
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 6,504      
Industrial Property | Kalamazoo, Michigan        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 958      
Buildings and Improvements 4,725      
Total 5,683      
Accumulated Depreciation and Amortization 80      
Industrial Property | Marshall, Michigan        
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 3,658      
Industrial Property | Plymouth, Michigan        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,296      
Buildings and Improvements 15,772      
Total 18,068      
Accumulated Depreciation and Amortization 7,325      
Industrial Property | Romulus, Michigan        
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 5,615      
Industrial Property | Warren, Michigan        
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 5,628      
Industrial Property | Minneapolis, Minnesota        
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 499      
Industrial Property | Byhalia, Mississippi | Byhalia, MS Industrial Property Acquired May-11        
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 8,460      
Industrial Property | Byhalia, Mississippi | Byhalia, MS Industrial Property Acquired Sep-17        
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 5,913      
Industrial Property | Canton, Mississippi        
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 19,856      
Industrial Property | Olive Branch, Mississippi | Olive Branch, MS Industrial Acquired Apr- 18        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,500      
Buildings and Improvements 42,556      
Total 45,056      
Accumulated Depreciation and Amortization 5,393      
Industrial Property | Olive Branch, Mississippi | Olive Branch, MS Industrial Acquired Apr- 18, Property 2        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,958      
Buildings and Improvements 38,702      
Total 40,660      
Accumulated Depreciation and Amortization 4,920      
Industrial Property | Olive Branch, Mississippi | Olive Branch, MS Industrial Acquired May-19        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,646      
Buildings and Improvements 40,446      
Total 43,092      
Accumulated Depreciation and Amortization 2,756      
Industrial Property | Olive Branch, Mississippi | Olive Branch, MS Industrial Acquired May-19, Property 2        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 851      
Buildings and Improvements 15,464      
Total 16,315      
Accumulated Depreciation and Amortization 1,041      
Industrial Property | Henderson, North Carolina        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,488      
Buildings and Improvements 7,185      
Total 8,673      
Accumulated Depreciation and Amortization 2,846      
Industrial Property | Lumberton, North Carolina        
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 5,426      
Industrial Property | Shelby, North Carolina        
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 6,713      
Industrial Property | Durham, New Hampshire        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,426      
Buildings and Improvements 6,982      
Total 9,408      
Accumulated Depreciation and Amortization 0      
Industrial Property | North Las Vegas, Nevada        
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 4,214      
Industrial Property | Erwin, New York        
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 4,021      
Industrial Property | Long Island City, New York        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 32,779      
Land and Land Estates 0      
Buildings and Improvements 42,759      
Total 42,759      
Accumulated Depreciation and Amortization 22,280      
Industrial Property | Cincinnati, Ohio        
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 3,655      
Industrial Property | Columbus, Ohio        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,990      
Buildings and Improvements 12,451      
Total 14,441      
Accumulated Depreciation and Amortization 4,904      
Industrial Property | Glenwillow, Ohio        
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 8,971      
Industrial Property | Hebron, Ohio | Hebron, OH Industrial, Acquired Dec-97        
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 2,383      
Industrial Property | Hebron, Ohio | Hebron, OH Industrial, Acquired Dec-01        
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 4,119      
Industrial Property | Monroe, Ohio | Monroe, OH Industrial Acquired Sep-19        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 544      
Buildings and Improvements 12,370      
Total 12,914      
Accumulated Depreciation and Amortization 706      
Industrial Property | Monroe, Ohio | Monroe, OH Industrial Acquired Sep-19, Property 2        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,123      
Buildings and Improvements 60,702      
Total 63,825      
Accumulated Depreciation and Amortization 3,612      
Industrial Property | Monroe, Ohio | Monroe, OH Industrial Acquired Sep-19, Property 3        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,950      
Buildings and Improvements 88,422      
Total 92,372      
Accumulated Depreciation and Amortization 5,067      
Industrial Property | Streetsboro, Ohio        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,441      
Buildings and Improvements 25,282      
Total 27,723      
Accumulated Depreciation and Amortization 11,198      
Industrial Property | Wilsonville, Oregon        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 6,815      
Buildings and Improvements 32,424      
Total 39,239      
Accumulated Depreciation and Amortization 6,025      
Industrial Property | Bristol, Pennsylvania        
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 8,802      
Industrial Property | Chester, South Carolina        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 4,913      
Land and Land Estates 1,629      
Buildings and Improvements 8,470      
Total 10,099      
Accumulated Depreciation and Amortization 2,578      
Industrial Property | Duncan, South Carolina | Duncan, SC Industrial Acquired Oct-19        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,406      
Buildings and Improvements 14,272      
Total 15,678      
Accumulated Depreciation and Amortization 775      
Industrial Property | Duncan, South Carolina | Duncan, SC Industrial Acquired Oct-19, Property 2        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,257      
Buildings and Improvements 13,252      
Total 14,509      
Accumulated Depreciation and Amortization 722      
Industrial Property | Duncan, South Carolina | Duncan, SC Industrial Acquired Apr-19        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,615      
Buildings and Improvements 27,830      
Total 29,445      
Accumulated Depreciation and Amortization 2,052      
Industrial Property | Duncan, South Carolina | Duncan, SC Industrial Acquired Jun-07        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 884      
Buildings and Improvements 8,755      
Total 9,639      
Accumulated Depreciation and Amortization 3,042      
Industrial Property | Greer, South Carolina        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 6,959      
Buildings and Improvements 78,405      
Total 85,364      
Accumulated Depreciation and Amortization 3,331      
Industrial Property | Laurens, South Carolina        
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 9,002      
Industrial Property | Spartanburg, South Carolina | Spartanburg, SC Industrial Acquired Aug-18        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,447      
Buildings and Improvements 23,758      
Total 25,205      
Accumulated Depreciation and Amortization 2,987      
Industrial Property | Spartanburg, South Carolina | Spartanburg, SC Industrial Acquired Dec-20        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,186      
Buildings and Improvements 15,814      
Total 17,000      
Accumulated Depreciation and Amortization 0      
Industrial Property | Cleveland, Tennessee        
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 4,759      
Industrial Property | Crossville, Tennessee        
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 5,277      
Industrial Property | Franklin, Tennessee        
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 3,980      
Industrial Property | Jackson, Tennessee        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,454      
Buildings and Improvements 49,031      
Total 50,485      
Accumulated Depreciation and Amortization 6,823      
Industrial Property | Lewisburg, Tennessee        
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 2,262      
Industrial Property | Millington, Tennessee        
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 14,810      
Industrial Property | Smyrna, Tennessee        
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 13,400      
Industrial Property | Arlington, Texas        
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 2,193      
Industrial Property | Brookshire, Texas        
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 4,401      
Industrial Property | Carrollton, Texas        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,228      
Buildings and Improvements 15,784      
Total 19,012      
Accumulated Depreciation and Amortization 2,309      
Industrial Property | Dallas, Texas        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,420      
Buildings and Improvements 23,330      
Total 25,750      
Accumulated Depreciation and Amortization 1,642      
Industrial Property | Grand Prairie, Texas        
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 2,730      
Industrial Property | Houston, Texas | Houston, TX Industrial Acquired Mar-15        
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 11,599      
Industrial Property | Houston, Texas | Houston, TX Industrial Acquired Mar-13        
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 13,979      
Industrial Property | Hutchins, Texas        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,307      
Buildings and Improvements 8,466      
Total 9,773      
Accumulated Depreciation and Amortization 220      
Industrial Property | Lancaster, Texas        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,847      
Buildings and Improvements 25,038      
Total 28,885      
Accumulated Depreciation and Amortization 0      
Industrial Property | Missouri City, Texas        
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 5,895      
Industrial Property | Northlake, Texas | Northlake, TX Industrial Acquired Feb-20        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 4,500      
Buildings and Improvements 71,636      
Total 76,136      
Accumulated Depreciation and Amortization 2,552      
Industrial Property | Northlake, Texas | Northlake, TX Industrial Acquired Dec-20        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 3,938      
Buildings and Improvements 37,185      
Total 41,123      
Accumulated Depreciation and Amortization 139      
Industrial Property | Pasadena, Texas | Pasadena, TX Industrial Acquired Jun-20        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,202      
Buildings and Improvements 17,096      
Total 19,298      
Accumulated Depreciation and Amortization 368      
Industrial Property | Pasadena, Texas | Pasadena, TX Industrial Acquired Aug-18        
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 1,899      
Industrial Property | San Antonio, Texas        
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 5,517      
Industrial Property | Chester, Virginia        
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 5,488      
Industrial Property | Winchester, Virginia | Winchester, VA Industrial Acquired Dec-17        
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 4,176      
Industrial Property | Winchester, Virginia | Winchester, VA Industrial Acquired Jun-07        
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 4,918      
Industrial Property | Winchester, Virginia | Winchester, VA Industrial Acquired Sept-20        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 2,818      
Buildings and Improvements 24,423      
Total 27,241      
Accumulated Depreciation and Amortization 357      
Industrial Property | Bingen, Washington        
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 6,132      
Industrial properties, Multi-tenant/vacant properties | Statesville, North Carolina        
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 6,545      
Industrial properties, Multi-tenant/vacant properties | Chillicothe, Ohio        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 735      
Buildings and Improvements 10,939      
Total 11,674      
Accumulated Depreciation and Amortization 3,911      
Industrial properties, Multi-tenant/vacant properties | Antioch, Tennessee        
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 4,575      
Office Building | McDonough, Georgia        
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 1,942      
Office Building | Arlington, Texas        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,274      
Buildings and Improvements 15,777      
Total 17,051      
Accumulated Depreciation and Amortization 4,536      
Office Building | Tucson, Arizona        
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 1,427      
Office Building | Palo Alto, California        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 20,176      
Land and Land Estates 12,398      
Buildings and Improvements 16,977      
Total 29,375      
Accumulated Depreciation and Amortization 25,642      
Office Building | Wall, New Jersey        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 1,867      
Land and Land Estates 8,985      
Buildings and Improvements 26,961      
Total 35,946      
Accumulated Depreciation and Amortization 17,824      
Office Building | Whippany, New Jersey        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 10,950      
Land and Land Estates 4,063      
Buildings and Improvements 19,711      
Total 23,774      
Accumulated Depreciation and Amortization 11,449      
Office Building | Philadelphia, Pennsylvania | Philadelphia, PA Office, Acquired Jun-05        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 13,209      
Buildings and Improvements 66,071      
Total 79,280      
Accumulated Depreciation and Amortization 45,920      
Office Building | Florence, South Carolina        
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 938      
Office Building | Fort Mill, South Carolina | Fort Mill, SC Office, Acquired Nov-04        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,798      
Buildings and Improvements 26,964      
Total 28,762      
Accumulated Depreciation and Amortization 20,773      
Office Building | Fort Mill, South Carolina | Fort Mill, SC Office, Acquired Dec-02        
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 7,381      
Office Building | Mission, Texas        
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 1,270      
Office Building | Herndon, Virginia        
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 12,789      
Office Building, Multi-tenant/vacant properties | Phoenix, Arizona        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 1,096      
Buildings and Improvements 6,228      
Total 7,324      
Accumulated Depreciation and Amortization 806      
Office Building, Multi-tenant/vacant properties | Baton Rouge, Louisiana        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 340      
Buildings and Improvements 1,535      
Total 1,875      
Accumulated Depreciation and Amortization 0      
Other Property | Venice, Florida        
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 10,712      
Other Property | Baltimore, Maryland | Baltimore, MD Other Acquired Dec-06        
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 | Baltimore, Maryland | Baltimore, MD Other Acquired Dec-15        
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 properties, Multi-tenant properties | Honolulu, Hawaii        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 8,259      
Buildings and Improvements 7,471      
Total 15,730      
Accumulated Depreciation and Amortization 7,416      
Construction in Progress        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land and Land Estates 0      
Buildings and Improvements 0      
Total 3,116      
Accumulated Depreciation and Amortization $ 0