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Schedule III - Real Estate and Accumulated Depreciation (Reconciliation of Real Estate Investments and Accumulated Depreciation) (Parentheticals) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |  |  |  |
Balance at the Beginning of the Year |  | $ 4,631,128 |  | $ 4,669,289 |  | $ 4,726,169
Additions: |  |  |  |  |  |
Acquisitions |  | 182,381 |  | 0 |  | 347,510
Capital expenditures and assets placed into service |  | 165,941 |  | 132,149 |  | 109,740
Less: |  |  |  |  |  |
Dispositions |  | (442,327) |  | (126,471) |  | (474,275)
Retirements |  | (49,535) |  | (43,839) |  | (39,855)
Balance at the end of the year |  | 4,487,588 |  | 4,631,128 |  | 4,669,289
Assets held for sale |  | (794,588) | [1] | (27,436) | [1] | 0
Operating properties |  | 3,693,000 |  | 4,603,692 |  | 4,669,289
Tax Basis of Assets, Cost for Income Tax Purposes |  | 3,900,000 |  | 3,700,000 |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |  |  |
Balance at the beginning of the year |  | 1,078,996 |  | 983,808 |  | 954,665
Real Estate Accumulated Depreciation Additions [Abstract] |  |  |  |  |  |
Depreciation expense — continuing operations |  | 159,080 |  | 160,641 |  | 150,236
Depreciation expense — discontinued operations |  | 0 |  | 0 |  | 9,164
Real Estate Accumulated Depreciation Less Dispositions [Abstract] |  |  |  |  |  |
Dispositions |  | (109,243) |  | (22,459) |  | (91,890)
Retirements |  | (48,217) |  | (42,994) |  | (38,367)
Balance at the end of the year |  | 1,080,616 |  | 1,078,996 |  | 983,808
Asset held for sale |  | (213,581) |  | (11,167) |  | 0
Real Estate Investment Property, Accumulated Depreciation |  | 867,035 |  | 1,067,829 |  |
Aggregate carrying value |  | 40,400 |  |  |  |
Impairment of properties held for use |  | 27,500 |  |  |  |
Estimated Fair Value Of Impaired Property |  | $ 12,900 |  |  |  |
Equity Method Investment, Ownership Percentage | [2] | 0.00% |  |  |  |
Tysons Corner [Member] | Secured Debt [Member] |  |  |  |  |  |
Real Estate Accumulated Depreciation Less Dispositions [Abstract] |  |  |  |  |  |
Debt Instrument Maturity Date |  | Oct. 09, 2015 |  |  |  |
3141 Fairview Park Drive [Member] |  |  |  |  |  |
Real Estate Accumulated Depreciation Less Dispositions [Abstract] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |  |  |
Land and Building [Member] |  |  |  |  |  |
Real Estate Accumulated Depreciation Less Dispositions [Abstract] |  |  |  |  |  |
Provision for impairment on assets held for sale |  | $ 45,400 |  |  |  |
Aggregate carrying value |  | 426,200 |  |  |  |
Estimated closing costs |  | 380,800 |  |  |  |
Accumulated Depreciation, including HFS [Member] |  |  |  |  |  |
Real Estate Accumulated Depreciation Less Dispositions [Abstract] |  |  |  |  |  |
Real Estate Investment Property, Accumulated Depreciation |  | $ 867,035 |  | $ 1,067,829 |  | $ 983,808
[1] | Real estate investments related to assets held for sale above represents gross real estate assets and does not include accumulated depreciation or other assets on the balance sheets of the properties held for sale. See Held for Sale section below.
[2] | Ownership percentage represents the Company’s entitlement to residual distributions after payments of priority returns, where applicable.

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