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Investments in Unconsolidated Joint Ventures (Statements of Operations of the Joint Ventures) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total revenue |  | $ 623,546 | $ 618,221 | $ 1,289,531 | $ 1,236,697 |  |
Expenses |  |  |  |  |  |  |
Depreciation and amortization |  | 153,175 | 167,844 | 312,623 | 322,067 |  |
Total expenses |  | 405,422 | 413,295 | 821,054 | 825,562 |  |
Operating income |  | 218,124 | 204,926 | 468,477 | 411,135 |  |
Other expense |  |  |  |  |  |  |
Interest expense |  | 105,003 | 108,534 | 210,312 | 217,291 |  |
Net income |  | 117,357 | 100,739 | 333,579 | 309,909 |  |
Income from unconsolidated joint ventures |  | 2,234 | 3,078 | 4,025 | 17,912 |  |
Distribution related to excess loan proceeds |  |  |  | 0 | 24,527 |  |
Mortgage notes payable, net |  | 3,189,013 |  | 3,189,013 |  |  | $ 3,435,242
Unconsolidated Joint Ventures [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total revenue | [1] | 38,368 | 39,152 | 76,037 | 78,684 |  |
Expenses |  |  |  |  |  |  |
Operating |  | 16,359 | 15,824 | 33,026 | 32,099 |  |
Depreciation and amortization |  | 9,204 | 8,951 | 18,268 | 18,022 |  |
Total expenses |  | 25,563 | 24,775 | 51,294 | 50,121 |  |
Operating income |  | 12,805 | 14,377 | 24,743 | 28,563 |  |
Other expense |  |  |  |  |  |  |
Interest expense |  | 8,383 | 7,986 | 16,772 | 15,966 |  |
Net income |  | 4,422 | 6,391 | 7,971 | 12,597 |  |
Company's share of net income |  | 2,052 | 2,902 | 3,651 | 17,544 | [2] |
Basis differential |  | 182 | 176 | 374 | 368 |  |
Income from unconsolidated joint ventures |  | 2,234 | 3,078 | 4,025 | 17,912 |  |
Straight-line rent adjustments |  | 3,600 | 300 | 5,800 | 2,000 |  |
Mortgage notes payable, net |  | $ 827,987 |  | $ 827,987 |  |  | $ 830,125
BP/CRF 901 New York Avenue LLC [Member] |  |  |  |  |  |  |
Other expense |  |  |  |  |  |  |
Distribution related to excess loan proceeds |  |  |  |  | 24,500 |  |
Mortgage notes payable, net |  |  | $ 225,000 |  | $ 225,000 |  |
[1] | Includes straight-line rent adjustments of approximately $3.6 million and $0.3 million for the three months ended June 30, 2016 and 2015, respectively, and approximately $5.8 million and $2.0 million for the six months ended June 30, 2016 and 2015, respectively.
[2] | During the six months ended June 30, 2015, the Company received a distribution of approximately $24.5 million, which was generated from the excess loan proceeds from the refinancing of 901 New York Avenue’s mortgage loan to a new 10-year mortgage loan totaling $225.0 million. The Company’s allocation of income and distributions for the six months ended June 30, 2015 was not proportionate to its nominal ownership interest as a result of the achievement of specified investment return thresholds, as provided for in the joint venture agreement.

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