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REAL ESTATE INVESTMENTS - Held for Sale and Use Impairment (Narrative) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) property | Dec. 31, 2019 USD ($) a ft² property | Dec. 31, 2018 USD ($) a property
Number of properties | property |  | 95 |
Building and improvements |  | $ 3,049,395 | $ 3,048,889
Assets held for sale, net |  | 7,349 | 11,599
Land Held For Development | Assets Held-for-sale |  |  |
Assets held for sale, net |  | $ 7,300 | $ 11,600
Acres | a |  | 35.2 | 37.9
Other |  |  |
Number of properties | property | 4 |  | 1
Impairment of properties held for use | $ 1,000 |  | $ 14,800
Carrying value of real estate prior to impairment |  | $ 10,200 | $ 52,800
Impairment hold period | 10 years |  | 10 years
Impairment on Held for Use Properties | Other |  |  |
Building and improvements |  | $ 9,200 | $ 38,000
Residual Capitalization Rates | Other |  |  |
Measurement input for impairment on assets held for sale | 0.0900 |  | 0.075
Discount Rates | Other |  |  |
Measurement input for impairment on assets held for sale | 0.0925 |  | 0.095
Metropolitan Washington, D.C. - Office | Residual Capitalization Rates | Assets Held-for-sale |  |  |
Measurement input for impairment on assets held for sale |  | 0.0747 |
Metropolitan Washington, D.C. - Office | Discount Rates | Assets Held-for-sale |  |  |
Measurement input for impairment on assets held for sale |  | 0.0860 |
Office Properties | Metropolitan Washington, D.C. - Office | Assets Held-for-sale |  |  |
Impairment hold period |  | 10 years |
Number of properties sold | property |  | 8 |
Rentable square feet | ft² |  | 1,293,197 |
Provision for impairment on assets held for sale |  | $ 56,900 |

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