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Real Estate Investments - Summary of Properties Classified as Held for Sale Included in Continuing Operations (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
ASSETS HELD FOR SALE |  |  |
Total assets held for sale, net | $ 11,599 | $ 392 |
Held for Sale Properties Included in Continuing Operations [Member] |  |  |
ASSETS HELD FOR SALE |  |  |
Land inventory | 11,599 |  |
Total real estate investments | 11,599 |  | $ 41,718
Total assets held for sale, net | 11,599 |  | 41,718
Operating properties |  |  | 73,591
Accumulated depreciation |  |  | (32,916)
Operating real estate investments, net |  |  | 40,675
Land held for development |  |  | 1,043
LIABILITIES HELD FOR SALE |  |  |
Other liabilities |  |  | 81
Total liabilities held for sale |  |  | 81
Held for Sale Properties Included in Continuing Operations [Member] | Pennsylvania Suburbs - Land [Member] |  |  |
ASSETS HELD FOR SALE |  |  |
Land inventory | 4,254 |  |
Total real estate investments | 4,254 |  |
Total assets held for sale, net | 4,254 |  |
Held for Sale Properties Included in Continuing Operations [Member] | Metropolitan Washington, D.C. - Office [Member] |  |  |
ASSETS HELD FOR SALE |  |  |
Total real estate investments |  |  | 9,785
Total assets held for sale, net |  |  | 9,785
Operating properties |  |  | 21,720
Accumulated depreciation |  |  | (11,935)
Operating real estate investments, net |  |  | 9,785
Land held for development |  |  | 0
LIABILITIES HELD FOR SALE |  |  |
Other liabilities |  |  | 73
Total liabilities held for sale |  |  | 73
Held for Sale Properties Included in Continuing Operations [Member] | Other Segment - Office [Member] |  |  |
ASSETS HELD FOR SALE |  |  |
Total real estate investments |  |  | 30,890
Total assets held for sale, net |  |  | 30,890
Operating properties |  |  | 51,871
Accumulated depreciation |  |  | (20,981)
Operating real estate investments, net |  |  | 30,890
Land held for development |  |  | 0
LIABILITIES HELD FOR SALE |  |  |
Other liabilities |  |  | 8
Total liabilities held for sale |  |  | 8
Held for Sale Properties Included in Continuing Operations [Member] | Other Segment - Land [Member] |  |  |
ASSETS HELD FOR SALE |  |  |
Land inventory | 7,345 |  |
Total real estate investments | 7,345 |  | 1,043
Total assets held for sale, net | $ 7,345 |  | 1,043
Operating properties |  |  | 0
Accumulated depreciation |  |  | 0
Operating real estate investments, net |  |  | 0
Land held for development |  |  | 1,043
LIABILITIES HELD FOR SALE |  |  |
Other liabilities |  |  | 0
Total liabilities held for sale |  |  | $ 0

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