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Real Estate Investments - Dispositions (Textual) (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) a property Parcel | Mar. 31, 2017 USD ($) segment | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) a property Parcel | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) a property
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Net gain (loss) on disposition of real estate | $ 1,088,000 |  | $ (727,000) | $ 8,411,000 | $ 114,729,000 |
Assets held for sale, net | $ 5,569,000 |  |  | $ 5,569,000 |  | $ 41,718,000
Number of Properties | property | 99 |  |  | 99 |  |
Impairment charges | $ 327,000 |  | $ 5,679,000 | $ 3,057,000 | $ 13,069,000 |
Aggregate carrying values of properties | $ 3,769,678,000 |  |  | 3,769,678,000 |  | 3,586,295,000
Land [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Net gain (loss) on disposition of real estate |  |  |  | $ 0 |  |
Acreage of land | a | 14.9 |  |  | 14.9 |  |
Assets Held-for-sale [Member] | Operating Real Estate Investments, Net [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Assets held for sale, net |  |  |  |  |  | 40,700,000
Assets Held-for-sale [Member] | Land Held For Development [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Assets held for sale, net |  |  |  |  |  | $ 1,000,000
Other Segment [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties | segment |  | 4 |  |  |  |
Carrying value of real estate prior to impairment |  | $ 10,200,000 |  |  |  |
Impairment charges |  |  |  | $ 0 |  |
Impairment of properties held for use |  | $ 1,000,000 |  |  |  |
Impairment Hold Period |  | 10 years |  |  |  |
Residual Capitalization Rates |  | 9.00% |  |  |  |
Discount Rates |  | 9.25% |  |  |  |
Other Segment [Member] | Impairment on Held for Use Properties [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Aggregate carrying values of properties |  | $ 9,200,000 |  |  |  |
Other Segment [Member] | Land [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Acreage of land | a | 50 |  |  | 50 |  |
Provision for impairment on assets held for sale |  |  |  | $ 300,000 |  |
Number of Parcels | Parcel | 1 |  |  | 1 |  |
Carrying value of real estate prior to impairment | $ 5,900,000 |  |  | $ 5,900,000 |  |
Aggregate carrying value | $ 5,600,000 |  |  | $ 5,600,000 |  |
Other Segment [Member] | Assets Held-for-sale [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Acreage of land | a | 50 |  |  | 50 |  | 5
Assets held for sale, net | $ 5,600,000 |  |  | $ 5,600,000 |  |
Provision for impairment on assets held for sale |  |  |  | $ 300,000 |  |
2970 Market Street (Cira Square) [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Net gain (loss) on disposition of real estate |  | $ 500,000 |  |  |  |
Office Properties [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties Sold | property |  |  |  | 12 |  |
Number of Properties | property | 87 |  |  | 87 |  |
Office Properties [Member] | Other Segment [Member] | Assets Held-for-sale [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  | 2
Office Properties [Member] | Metropolitan DC [Member] | Assets Held-for-sale [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  | 3
Retail Properties [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties Sold | property |  |  |  | 1 |  |
Mixed-use Property [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties Sold | property |  |  |  | 1 |  |

X
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