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Investments in Unconsolidated Joint Ventures (Statements of Operations of the Joint Ventures) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage notes payable |  | $ 3,438,714 |  |  |  | $ 4,309,484 |  |  |  | $ 3,438,714 |  | $ 4,309,484 |
Total revenue |  | 624,240 | $ 629,884 | $ 618,221 | $ 618,476 | 613,707 | $ 618,803 | $ 589,794 | $ 574,694 | 2,490,821 |  | 2,396,998 | $ 2,135,539
Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 639,542 |  | 628,573 | 560,637
Total expenses |  |  |  |  |  |  |  |  |  | 1,641,456 |  | 1,595,176 | 1,457,419
Operating income |  |  |  |  |  |  |  |  |  | 849,365 |  | 801,822 | 678,120
Other income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | (432,196) |  | (455,743) | (446,880)
(Losses) gains from early extinguishments of debt |  |  |  |  |  |  |  |  |  | (22,040) |  | (10,633) | 122
Income (loss) from continuing operations |  | 85,406 | $ 123,792 | $ 100,739 | $ 114,086 | 85,323 | $ 109,038 | $ 95,901 | $ 67,756 | 424,023 |  | 358,018 | 703,648
Net income (loss) |  |  |  |  |  |  |  |  |  | 799,918 |  | 526,057 | 841,440
Income from unconsolidated joint ventures |  |  |  |  |  |  |  |  |  | 22,770 |  | 12,769 | 75,074
Straight-line rent adjustments |  |  |  |  |  |  |  |  |  | 80,000 |  | 63,100 | 65,800
Above and below market rent adjustments, net |  |  |  |  |  |  |  |  |  | 35,900 |  | 48,300 | 28,000
Proceeds from Sale of Equity Method Investments |  |  |  |  |  |  |  |  |  | 24,527 |  | 1,491 | 225,862
Gain on consolidation of joint ventures |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 385,991
Unconsolidated Joint Ventures [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage notes payable |  | 833,895 |  |  |  | $ 830,075 |  |  |  | 833,895 |  | 830,075 |
Total revenue | [1] |  |  |  |  |  |  |  |  | 155,642 |  | 158,161 | 311,548
Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating |  |  |  |  |  |  |  |  |  | 65,093 |  | 62,974 | 105,319
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 36,057 |  | 37,041 | 86,088
Total expenses |  |  |  |  |  |  |  |  |  | 101,150 |  | 100,015 | 191,407
Operating income |  |  |  |  |  |  |  |  |  | 54,492 |  | 58,146 | 120,141
Other income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | (32,176) |  | (31,896) | (112,535)
(Losses) gains from early extinguishments of debt |  |  |  |  |  |  |  |  |  | 0 |  | 0 | (1,677)
Income (loss) from continuing operations |  |  |  |  |  |  |  |  |  | 22,316 |  | 26,250 | 5,929
Gains on sale of real estate |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 14,207
Net income (loss) |  |  |  |  |  |  |  |  |  | 22,316 |  | 26,250 | 20,136
Company's share of net income (loss) |  |  |  |  |  |  |  |  |  | 22,031 | [2] | 11,913 | 4,612
Gains on sale of real estate |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 54,501
Basis differential |  |  |  |  |  |  |  |  |  | 739 |  | 856 | (1,017)
Elimination of inter-entity interest on partner loan |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 16,978
Income from unconsolidated joint ventures |  |  |  |  |  |  |  |  |  | 22,770 |  | 12,769 | 75,074
Straight-line rent adjustments |  |  |  |  |  |  |  |  |  | 3,900 |  | 3,000 | 7,800
Above and below market rent adjustments, net |  |  |  |  |  |  |  |  |  | (200) |  | (100) | 33,700
Gain on consolidation of joint ventures |  |  |  |  |  |  |  |  |  | 0 |  | $ 0 | $ 385,991
BP/CRF 901 New York Avenue LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage notes payable |  | $ 225,000 |  |  |  |  |  |  |  | 225,000 |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Equity Method Investments |  |  |  |  |  |  |  |  |  | $ 24,500 |  |  |
[1] | Includes straight-line rent adjustments of $3.9 million, $3.0 million and $7.8 million for the years ended December 31, 2015, 2014 and 2013, respectively. Includes net above-/below-market rent adjustments of $(0.2) million, $(0.1) million and $33.7 million for the years ended December 31, 2015, 2014 and 2013, respectively.
[2] | During the year ended December 31, 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 year ended December 31 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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