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Real Estate Investments - Dispositions (Textual) (Details) | 3 Months Ended | 6 Months Ended | 9 Months Ended
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Sep. 30, 2017 USD ($) a property | Jun. 30, 2017 USD ($) a Parcel | Mar. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) a property | Sep. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) a Parcel | Sep. 30, 2017 USD ($) a property | Sep. 30, 2016 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Net gain (loss) on disposition of real estate |  | $ 0 |  |  |  | $ (104,000) |  | $ 8,411,000 | $ 114,625,000
Number of Properties | property |  | 97 |  |  |  |  |  | 97 |
Assets held for sale, net |  | $ 31,125,000 |  |  | $ 41,718,000 |  |  | $ 31,125,000 |
Impairment charges |  | 0 |  |  |  | $ 0 |  | 3,057,000 | $ 13,069,000
Aggregate carrying values of properties |  | $ 3,769,067,000 |  |  | 3,586,295,000 |  |  | 3,769,067,000 |
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 |  |  |  |  |  |  |  | $ 953,000 |
Acreage of land | a |  | 76.4 |  |  |  |  |  | 76.4 |
Assets Held-for-sale [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Number of Properties | property |  | 6 |  |  |  |  |  | 6 |
Assets held for sale, net |  | $ 31,125,000 |  |  |  |  |  | $ 31,125,000 |
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 Segments |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Number of Properties | segment |  |  |  | 4 |  |  |  |  |
Impairment charges |  | 0 |  |  |  |  |  |  |
Carrying value of real estate prior to impairment |  | 10,200,000 |  |  |  |  |  | 10,200,000 |
Impairment of properties held for use |  |  |  | $ 1,000,000 |  |  |  |  |
Impairment Hold Period |  |  |  | 10 years |  |  |  |  |
Residual Capitalization Rates |  |  |  | 9.00% |  |  |  |  |
Discount Rates |  |  |  | 9.25% |  |  |  |  |
Other Segments | 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 |  |  |  |  |  | 9,200,000 |
Other Segments | Land [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Impairment charges |  | $ 0 |  |  |  |  |  |  |
Other Segments | Assets Held-for-sale [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Provision for impairment on assets held for sale |  |  |  |  |  |  |  | 0 |
Acreage of land | a |  |  |  |  | 5 |  |  |  |
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 |  |  |  |  |
Bishops Gate [Member] | 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 | [1] |  |  |  |  |  |  | $ 71,000 |
Provision for impairment on assets held for sale |  |  | $ 300,000 |  | $ 3,000,000 |  |  |  |
Acreage of land | a |  | 49.5 |  |  |  |  |  | 49.5 |
Bishops Gate [Member] | Other Segments | Land [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Provision for impairment on assets held for sale |  |  |  |  |  |  | $ 300,000 |  |
Acreage of land | a |  |  | 50 |  |  |  | 50 |  |
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 |  |
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 |  | 82 |  |  |  |  |  | 82 |
Office Properties [Member] | Other Segments | 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 |
[1] | During the fourth quarter of 2016, the Company recognized an impairment of $3.0 million. During the second quarter of 2017, the Company recognized an additional impairment of $0.3 million, representing closing costs. See “Land Impairment” section below.

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