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Real Estate Investments - Summary of Properties Classified as Held for Sale Included in Continuing Operations (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
ASSETS HELD FOR SALE |  |  |
Total assets held for sale, net |  | $ 31,125 | $ 41,718
LIABILITIES HELD FOR SALE |  |  |
Total liabilities held for sale |  | 269 | $ 81
Held for Sale Properties Included in Continuing Operations [Member] |  |  |
ASSETS HELD FOR SALE |  |  |
Operating properties |  | 47,291 |
Accumulated depreciation |  | (16,191) |
Operating real estate investments, net |  | 31,100 |
Construction-in-progress |  | 25 |
Total assets held for sale, net |  | 31,125 |
LIABILITIES HELD FOR SALE |  |  |
Other liabilities |  | 269 |
Total liabilities held for sale |  | 269 |
Held for Sale Properties Included in Continuing Operations [Member] | 630 Allendale Road - Office [Member] |  |  |
ASSETS HELD FOR SALE |  |  |
Operating properties | [1] | 19,482 |
Accumulated depreciation | [1] | (6,985) |
Operating real estate investments, net | [1] | 12,497 |
Construction-in-progress | [1] | 0 |
Total assets held for sale, net | [1] | 12,497 |
LIABILITIES HELD FOR SALE |  |  |
Other liabilities | [1] | 35 |
Total liabilities held for sale | [1] | 35 |
Held for Sale Properties Included in Continuing Operations [Member] | Newtown Square - Office [Member] |  |  |
ASSETS HELD FOR SALE |  |  |
Operating properties | [2] | 27,809 |
Accumulated depreciation | [2] | (9,206) |
Operating real estate investments, net | [2] | 18,603 |
Construction-in-progress | [2] | 25 |
Total assets held for sale, net | [2] | 18,628 |
LIABILITIES HELD FOR SALE |  |  |
Other liabilities | [2] | 234 |
Total liabilities held for sale | [2] | $ 234 |
[1] | Office property containing 150,000 rentable square feet located in the Pennsylvania Suburbs segment.
[2] | Five office properties containing 252,802 rentable square feet located in the Pennsylvania Suburbs segment.

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