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Schedule III - Real Estate Assets and Accumulated Depreciation and Amortization - Schedule III (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 479,836      
Land 281,091      
Building and Improvements 2,635,405      
Building and Improvements (256,469)      
Land 231,175      
Building and Improvements 2,378,936      
Total 2,610,111 $ 3,497,256 $ 5,570,160 $ 4,310,302
Accumulated Depreciation and Amortization 550,552 $ 644,639 $ 993,323 $ 817,773
Aggregate cost of real estate owned for income tax purposes 2,800,000      
Held-for-sale        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 11,709      
Land 12,049      
Building and Improvements 66,203      
Building and Improvements (12,005)      
Land 10,091      
Building and Improvements 54,198      
Total 64,289      
Accumulated Depreciation and Amortization 14,636      
Industrial        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 267,439      
Land 76,873      
Building and Improvements 614,448      
Building and Improvements 50,416      
Land 76,873      
Building and Improvements 664,864      
Total 741,737      
Accumulated Depreciation and Amortization 152,353      
Industrial | Hopkins        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land 274      
Building and Improvements 7,567      
Building and Improvements 963      
Land 274      
Building and Improvements 8,530      
Total 8,804      
Accumulated Depreciation and Amortization $ 3,667      
Industrial | Hopkins | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Industrial | Hopkins | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Industrial | TransDigm        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 3,773      
Building and Improvements 9,030      
Building and Improvements 411      
Land 3,773      
Building and Improvements 9,441      
Total 13,214      
Accumulated Depreciation and Amortization $ 3,694      
Industrial | TransDigm | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Industrial | TransDigm | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Industrial | Berry Global        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 2,674      
Building and Improvements 13,229      
Building and Improvements 1,901      
Land 2,674      
Building and Improvements 15,130      
Total 17,804      
Accumulated Depreciation and Amortization $ 5,539      
Industrial | Berry Global | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Industrial | Berry Global | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Industrial | Amazon - Arlington Heights        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances      
Land 7,697      
Building and Improvements 21,843      
Building and Improvements 5,879      
Land 7,697      
Building and Improvements 27,722      
Total 35,419      
Accumulated Depreciation and Amortization $ 10,236      
Industrial | Amazon - Arlington Heights | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Industrial | Amazon - Arlington Heights | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Industrial | Roush Industries        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 875      
Building and Improvements 11,375      
Building and Improvements 2,632      
Land 875      
Building and Improvements 14,007      
Total 14,882      
Accumulated Depreciation and Amortization $ 4,983      
Industrial | Roush Industries | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Industrial | Roush Industries | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Industrial | Samsonite        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 5,040      
Building and Improvements 42,490      
Building and Improvements 268      
Land 5,040      
Building and Improvements 42,758      
Total 47,798      
Accumulated Depreciation and Amortization $ 12,283      
Industrial | Samsonite | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Industrial | Samsonite | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Industrial | RH        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 15,463      
Building and Improvements 36,613      
Building and Improvements 37,692      
Land 15,463      
Building and Improvements 74,305      
Total 89,768      
Accumulated Depreciation and Amortization $ 28,707      
Industrial | RH | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Industrial | RH | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Industrial | PepsiCo        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 5,433      
Building and Improvements 55,341      
Building and Improvements 181      
Land 5,433      
Building and Improvements 55,522      
Total 60,955      
Accumulated Depreciation and Amortization $ 9,866      
Industrial | PepsiCo | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Industrial | PepsiCo | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Industrial | Shaw Industries        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 5,465      
Building and Improvements 57,116      
Building and Improvements 0      
Land 5,465      
Building and Improvements 57,116      
Total 62,581      
Accumulated Depreciation and Amortization $ 10,063      
Industrial | Shaw Industries | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Industrial | Shaw Industries | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Industrial | Huntington Ingalls        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 3,100      
Building and Improvements 15,903      
Building and Improvements 116      
Land 3,100      
Building and Improvements 16,019      
Total 19,119      
Accumulated Depreciation and Amortization $ 3,781      
Industrial | Huntington Ingalls | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Industrial | Huntington Ingalls | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Industrial | Huntington Ingalls        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 3,113      
Building and Improvements 15,968      
Building and Improvements 95      
Land 3,113      
Building and Improvements 16,063      
Total 19,176      
Accumulated Depreciation and Amortization $ 3,797      
Industrial | Huntington Ingalls | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Industrial | Huntington Ingalls | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Industrial | OceanX        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 978      
Building and Improvements 16,705      
Building and Improvements 0      
Land 978      
Building and Improvements 16,705      
Total 17,683      
Accumulated Depreciation and Amortization $ 4,560      
Industrial | OceanX | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Industrial | OceanX | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Industrial | Atlas Copco        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 1,156      
Building and Improvements 19,802      
Building and Improvements 0      
Land 1,156      
Building and Improvements 19,802      
Total 20,958      
Accumulated Depreciation and Amortization $ 4,829      
Industrial | Atlas Copco | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Industrial | Atlas Copco | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Industrial | ZF Wabco        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 1,226      
Building and Improvements 14,662      
Building and Improvements 279      
Land 1,226      
Building and Improvements 14,941      
Total 16,167      
Accumulated Depreciation and Amortization $ 2,476      
Industrial | ZF Wabco | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Industrial | ZF Wabco | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Industrial | 3M        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 250,000      
Land 5,802      
Building and Improvements 82,148      
Building and Improvements (1)      
Land 5,802      
Building and Improvements 82,147      
Total 87,949      
Accumulated Depreciation and Amortization $ 12,254      
Industrial | 3M | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Industrial | 3M | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Industrial | Amazon - Etna        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 4,773      
Building and Improvements 107,021      
Building and Improvements 0      
Land 4,773      
Building and Improvements 107,021      
Total 111,794      
Accumulated Depreciation and Amortization $ 18,987      
Industrial | Amazon - Etna | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Industrial | Amazon - Etna | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Industrial | Pepsi Bottling Ventures        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 17,439      
Land 3,407      
Building and Improvements 32,737      
Building and Improvements 0      
Land 3,407      
Building and Improvements 32,737      
Total 36,144      
Accumulated Depreciation and Amortization $ 4,478      
Industrial | Pepsi Bottling Ventures | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Industrial | Pepsi Bottling Ventures | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Industrial | Fidelity Building Services        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 1,662      
Building and Improvements 11,181      
Building and Improvements 0      
Land 1,662      
Building and Improvements 11,181      
Total 12,843      
Accumulated Depreciation and Amortization $ 1,197      
Industrial | Fidelity Building Services | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Industrial | Fidelity Building Services | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Industrial | Amazon - Etna        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 4,962      
Building and Improvements 43,717      
Building and Improvements 0      
Land 4,962      
Building and Improvements 43,717      
Total 48,679      
Accumulated Depreciation and Amortization $ 6,956      
Industrial | Amazon - Etna | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Industrial | Amazon - Etna | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 135,090      
Building and Improvements 1,544,200      
Building and Improvements (159,993)      
Land 121,752      
Building and Improvements 1,384,207      
Total 1,505,959      
Accumulated Depreciation and Amortization 286,136      
Office | AT&T (14500 NE 87th Street)        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land 2,607      
Building and Improvements 12,483      
Building and Improvements 953      
Land 2,607      
Building and Improvements 13,436      
Total 16,043      
Accumulated Depreciation and Amortization $ 5,138      
Office | AT&T (14500 NE 87th Street) | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | AT&T (14500 NE 87th Street) | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | AT&T (14520 NE 87th Street)        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 2,599      
Building and Improvements 12,448      
Building and Improvements 615      
Land 2,599      
Building and Improvements 13,063      
Total 15,662      
Accumulated Depreciation and Amortization $ 6,493      
Office | AT&T (14520 NE 87th Street) | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | AT&T (14520 NE 87th Street) | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | AT&T (14560 NE 87th Street)        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 1,564      
Building and Improvements 7,490      
Building and Improvements 776      
Land 1,564      
Building and Improvements 8,266      
Total 9,830      
Accumulated Depreciation and Amortization $ 2,436      
Office | AT&T (14560 NE 87th Street) | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | AT&T (14560 NE 87th Street) | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | PPG        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 2,650      
Building and Improvements 26,745      
Building and Improvements 54      
Land 2,650      
Building and Improvements 26,799      
Total 29,449      
Accumulated Depreciation and Amortization $ 11,204      
Office | PPG | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | PPG | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | York Space Systems (East Village)        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 2,600      
Building and Improvements 13,500      
Building and Improvements 11,191      
Land 2,600      
Building and Improvements 24,691      
Total 27,291      
Accumulated Depreciation and Amortization $ 9,697      
Office | York Space Systems (East Village) | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | York Space Systems (East Village) | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | Maxar Technologies        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 8,600      
Building and Improvements 83,400      
Building and Improvements 0      
Land 8,600      
Building and Improvements 83,400      
Total 92,000      
Accumulated Depreciation and Amortization $ 31,897      
Office | Maxar Technologies | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | Maxar Technologies | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | Spectrum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 1,000      
Building and Improvements 16,772      
Building and Improvements 0      
Land 1,000      
Building and Improvements 16,772      
Total 17,772      
Accumulated Depreciation and Amortization $ 7,072      
Office | Spectrum | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | Spectrum | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | Amentum (Heritage II)        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 1,955      
Building and Improvements 15,540      
Building and Improvements (3,438)      
Land 649      
Building and Improvements 12,102      
Total 12,751      
Accumulated Depreciation and Amortization $ 3,672      
Office | Amentum (Heritage II) | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | Amentum (Heritage II) | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | 530 Great Circle Road        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 4,724      
Building and Improvements 18,281      
Building and Improvements 6,169      
Land 4,724      
Building and Improvements 24,450      
Total 29,174      
Accumulated Depreciation and Amortization $ 5,729      
Office | 530 Great Circle Road | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | 530 Great Circle Road | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | Cigna (500 Great Circle Road)        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 3,402      
Building and Improvements 13,166      
Building and Improvements 404      
Land 3,402      
Building and Improvements 13,570      
Total 16,972      
Accumulated Depreciation and Amortization $ 4,322      
Office | Cigna (500 Great Circle Road) | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | Cigna (500 Great Circle Road) | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | LPL (1055 & 1060 LPL Way)        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 4,612      
Building and Improvements 86,352      
Building and Improvements 0      
Land 4,612      
Building and Improvements 86,352      
Total 90,964      
Accumulated Depreciation and Amortization $ 15,412      
Office | LPL (1055 & 1060 LPL Way) | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | LPL (1055 & 1060 LPL Way) | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | LPL (1040 LPL Way)        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 1,273      
Building and Improvements 41,509      
Building and Improvements 0      
Land 1,273      
Building and Improvements 41,509      
Total 42,782      
Accumulated Depreciation and Amortization $ 7,407      
Office | LPL (1040 LPL Way) | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | LPL (1040 LPL Way) | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | McKesson (5601 N. Pima Road)        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 159      
Building and Improvements 35,490      
Building and Improvements 1,362      
Land 159      
Building and Improvements 36,852      
Total 37,011      
Accumulated Depreciation and Amortization $ 13,206      
Office | McKesson (5601 N. Pima Road) | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | McKesson (5601 N. Pima Road) | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | OnSemi (5701 N. Pima Road)        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 153      
Building and Improvements 34,270      
Building and Improvements 6,253      
Land 153      
Building and Improvements 40,523      
Total 40,676      
Accumulated Depreciation and Amortization $ 12,939      
Office | OnSemi (5701 N. Pima Road) | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | OnSemi (5701 N. Pima Road) | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | Travel & Leisure, Co.        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 9,677      
Building and Improvements 73,058      
Building and Improvements 0      
Land 9,677      
Building and Improvements 73,058      
Total 82,735      
Accumulated Depreciation and Amortization $ 15,855      
Office | Travel & Leisure, Co. | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | Travel & Leisure, Co. | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | Rapiscan Systems        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 2,006      
Building and Improvements 10,755      
Building and Improvements 40      
Land 2,006      
Building and Improvements 10,795      
Total 12,801      
Accumulated Depreciation and Amortization $ 2,834      
Office | Rapiscan Systems | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | Rapiscan Systems | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | Toshiba TEC        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 1,916      
Building and Improvements 38,796      
Building and Improvements (1)      
Land 1,916      
Building and Improvements 38,795      
Total 40,711      
Accumulated Depreciation and Amortization $ 9,065      
Office | Toshiba TEC | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | Toshiba TEC | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | IGT        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 5,673      
Building and Improvements 69,631      
Building and Improvements 0      
Land 5,673      
Building and Improvements 69,631      
Total 75,304      
Accumulated Depreciation and Amortization $ 12,571      
Office | IGT | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | IGT | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | Zoetis        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 3,718      
Building and Improvements 44,817      
Building and Improvements 0      
Land 3,718      
Building and Improvements 44,817      
Total 48,535      
Accumulated Depreciation and Amortization $ 9,126      
Office | Zoetis | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | Zoetis | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | Southern Company        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 7,794      
Building and Improvements 159,181      
Building and Improvements 0      
Land 7,794      
Building and Improvements 159,181      
Total 166,975      
Accumulated Depreciation and Amortization $ 21,270      
Office | Southern Company | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | Southern Company | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | MISO        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 3,725      
Building and Improvements 26,820      
Building and Improvements 1      
Land 3,725      
Building and Improvements 26,821      
Total 30,546      
Accumulated Depreciation and Amortization $ 5,792      
Office | MISO | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | MISO | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | Mckesson (5801 N. Pima Road)        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 0      
Building and Improvements 41,640      
Building and Improvements 68      
Land 0      
Building and Improvements 41,708      
Total 41,708      
Accumulated Depreciation and Amortization $ 9,479      
Office | Mckesson (5801 N. Pima Road) | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | Mckesson (5801 N. Pima Road) | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | Freeport McMoRan        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 4,264      
Building and Improvements 120,686      
Building and Improvements (79,513)      
Land 1,453      
Building and Improvements 41,173      
Total 42,626      
Accumulated Depreciation and Amortization $ 6,002      
Office | Freeport McMoRan | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | Freeport McMoRan | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | Avnet (Phoenix)        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 5,394      
Building and Improvements 32,883      
Building and Improvements 0      
Land 5,394      
Building and Improvements 32,883      
Total 38,277      
Accumulated Depreciation and Amortization $ 7,073      
Office | Avnet (Phoenix) | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | Avnet (Phoenix) | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | Terraces at Copley Point        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 23,897      
Building and Improvements 88,625      
Building and Improvements 55      
Land 23,897      
Building and Improvements 88,680      
Total 112,577      
Accumulated Depreciation and Amortization $ 14,529      
Office | Terraces at Copley Point | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | Terraces at Copley Point | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | Occidental Petroleum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 6,841      
Building and Improvements 26,496      
Building and Improvements 0      
Land 6,841      
Building and Improvements 26,496      
Total 33,337      
Accumulated Depreciation and Amortization $ 3,579      
Office | Occidental Petroleum | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | Occidental Petroleum | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | Keurig Dr. Pepper (63 South Ave)        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 5,111      
Building and Improvements 49,276      
Building and Improvements (4,409)      
Land 4,646      
Building and Improvements 44,867      
Total 49,513      
Accumulated Depreciation and Amortization $ 5,198      
Office | Keurig Dr. Pepper (63 South Ave) | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | Keurig Dr. Pepper (63 South Ave) | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | Keurig Dr. Pepper (53 South Ave)        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 3,262      
Building and Improvements 169,861      
Building and Improvements (51,809)      
Land 2,264      
Building and Improvements 118,052      
Total 120,316      
Accumulated Depreciation and Amortization $ 12,178      
Office | Keurig Dr. Pepper (53 South Ave) | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | Keurig Dr. Pepper (53 South Ave) | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | 40 Wright        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 2,873      
Building and Improvements 51,679      
Building and Improvements (22,715)      
Land 1,565      
Building and Improvements 28,964      
Total 30,529      
Accumulated Depreciation and Amortization $ 2,905      
Office | 40 Wright | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | 40 Wright | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | 136 Capcom        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 887      
Building and Improvements 5,176      
Building and Improvements 0      
Land 887      
Building and Improvements 5,176      
Total 6,063      
Accumulated Depreciation and Amortization $ 1,071      
Office | 136 Capcom | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | 136 Capcom | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | 204 Capcom        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 915      
Building and Improvements 5,343      
Building and Improvements 0      
Land 915      
Building and Improvements 5,343      
Total 6,258      
Accumulated Depreciation and Amortization $ 1,106      
Office | 204 Capcom | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | 204 Capcom | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | Cigna (Express Scripts)        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 4,725      
Building and Improvements 20,836      
Building and Improvements (15,164)      
Land 905      
Building and Improvements 5,672      
Total 6,577      
Accumulated Depreciation and Amortization $ 1,037      
Office | Cigna (Express Scripts) | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | Cigna (Express Scripts) | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | International Paper        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 1,376      
Building and Improvements 77,536      
Building and Improvements 0      
Land 1,376      
Building and Improvements 77,536      
Total 78,912      
Accumulated Depreciation and Amortization $ 8,354      
Office | International Paper | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | International Paper | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Office | Tech Data Corp.        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 3,138      
Building and Improvements 13,659      
Building and Improvements (10,885)      
Land 508      
Building and Improvements 2,774      
Total 3,282      
Accumulated Depreciation and Amortization $ 488      
Office | Tech Data Corp. | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Office | Tech Data Corp. | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Other        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 212,397      
Land 69,128      
Building and Improvements 476,757      
Building and Improvements (146,892)      
Land 32,550      
Building and Improvements 329,865      
Total 362,415      
Accumulated Depreciation and Amortization 112,063      
Other | Northrop Grumman        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 92,444      
Land 1,300      
Building and Improvements 16,188      
Building and Improvements 619      
Land 1,300      
Building and Improvements 16,807      
Total 18,107      
Accumulated Depreciation and Amortization $ 8,322      
Other | Northrop Grumman | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Other | Northrop Grumman | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Other | Raytheon Technologies        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 1,330      
Building and Improvements 37,858      
Building and Improvements 0      
Land 1,330      
Building and Improvements 37,858      
Total 39,188      
Accumulated Depreciation and Amortization $ 16,003      
Other | Raytheon Technologies | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Other | Raytheon Technologies | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Other | Avnet (Chandler)        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 1,860      
Building and Improvements 31,481      
Building and Improvements 47      
Land 1,860      
Building and Improvements 31,528      
Total 33,388      
Accumulated Depreciation and Amortization $ 10,241      
Other | Avnet (Chandler) | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Other | Avnet (Chandler) | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Other | 30 Independence        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 5,300      
Building and Improvements 36,768      
Building and Improvements (11,037)      
Land 1,720      
Building and Improvements 25,731      
Total 27,451      
Accumulated Depreciation and Amortization $ 10,229      
Other | 30 Independence | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Other | 30 Independence | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Other | Wyndham Hotels & Resorts        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 119,953      
Land 6,200      
Building and Improvements 91,153      
Building and Improvements 2,494      
Land 6,200      
Building and Improvements 93,647      
Total 99,847      
Accumulated Depreciation and Amortization $ 28,807      
Other | Wyndham Hotels & Resorts | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Other | Wyndham Hotels & Resorts | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Other | Crosspoint        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 15,000      
Building and Improvements 45,893      
Building and Improvements (26,474)      
Land 4,210      
Building and Improvements 19,419      
Total 23,629      
Accumulated Depreciation and Amortization $ 6,693      
Other | Crosspoint | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Other | Crosspoint | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Other | Level 3 (ParkRidge One)        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 10,554      
Building and Improvements 35,817      
Building and Improvements (18,023)      
Land 4,753      
Building and Improvements 17,794      
Total 22,547      
Accumulated Depreciation and Amortization $ 7,854      
Other | Level 3 (ParkRidge One) | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Other | Level 3 (ParkRidge One) | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Other | Franklin Center        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 6,989      
Building and Improvements 46,875      
Building and Improvements (36,567)      
Land 1,320      
Building and Improvements 10,308      
Total 11,628      
Accumulated Depreciation and Amortization $ 3,273      
Other | Franklin Center | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Other | Franklin Center | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Other | Owens Corning        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 867      
Building and Improvements 4,972      
Building and Improvements 547      
Land 867      
Building and Improvements 5,519      
Total 6,386      
Accumulated Depreciation and Amortization $ 1,480      
Other | Owens Corning | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Other | Owens Corning | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Other | Wood Group (Westgate II)        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 7,716      
Building and Improvements 49,292      
Building and Improvements (39,189)      
Land 1,471      
Building and Improvements 10,103      
Total 11,574      
Accumulated Depreciation and Amortization $ 2,961      
Other | Wood Group (Westgate II) | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Other | Wood Group (Westgate II) | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Other | Administrative Office of Pennsylvania Courts        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 1,246      
Building and Improvements 10,125      
Building and Improvements 283      
Land 1,246      
Building and Improvements 10,408      
Total 11,654      
Accumulated Depreciation and Amortization $ 2,817      
Other | Administrative Office of Pennsylvania Courts | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Other | Administrative Office of Pennsylvania Courts | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Other | MGM Corporate Center (840 Grier Drive)        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 1,634      
Building and Improvements 9,558      
Building and Improvements 818      
Land 1,634      
Building and Improvements 10,376      
Total 12,010      
Accumulated Depreciation and Amortization $ 2,987      
Other | MGM Corporate Center (840 Grier Drive) | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Other | MGM Corporate Center (840 Grier Drive) | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Other | MGM Corporate Center (880 Grier Drive)        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 2,188      
Building and Improvements 12,771      
Building and Improvements 326      
Land 2,188      
Building and Improvements 13,097      
Total 15,285      
Accumulated Depreciation and Amortization $ 3,719      
Other | MGM Corporate Center (880 Grier Drive) | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Other | MGM Corporate Center (880 Grier Drive) | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Other | MGM Corporate Center (950 Grier Drive)        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 723      
Building and Improvements 4,220      
Building and Improvements 146      
Land 723      
Building and Improvements 4,366      
Total 5,089      
Accumulated Depreciation and Amortization $ 1,299      
Other | MGM Corporate Center (950 Grier Drive) | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Other | MGM Corporate Center (950 Grier Drive) | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Other | Hitachi Astemo        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 1,214      
Building and Improvements 18,965      
Building and Improvements 57      
Land 1,214      
Building and Improvements 19,022      
Total 20,236      
Accumulated Depreciation and Amortization $ 4,440      
Other | Hitachi Astemo | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Other | Hitachi Astemo | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Other | 345 Bob Heath Drive        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Land 5,007      
Building and Improvements 24,821      
Building and Improvements (20,939)      
Land 514      
Building and Improvements 3,882      
Total 4,396      
Accumulated Depreciation and Amortization $ 938      
Other | 345 Bob Heath Drive | Minimum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 5 years      
Other | 345 Bob Heath Drive | Maximum        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statement is computed 40 years      
Other | Held-for-sale | Hitachi Energy USA        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 11,709      
Land 5,637      
Building and Improvements 25,280      
Building and Improvements 0      
Land 5,637      
Building and Improvements 25,280      
Total 30,917      
Accumulated Depreciation and Amortization 9,973      
Northeast | Held-for-sale | Corteva Agriscience        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land 6,412      
Building and Improvements 40,923      
Building and Improvements (12,005)      
Land 4,454      
Building and Improvements 28,918      
Total 33,372      
Accumulated Depreciation and Amortization $ 4,663