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Investments in Unconsolidated Joint Ventures (Statements of Operations of the Joint Ventures) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Total revenue |  | $ 665,985 | $ 618,476 |  |
Expenses |  |  |  |  |
Depreciation and amortization |  | 159,448 | 154,223 |  |
Total expenses |  | 415,632 | 412,267 |  |
Operating income |  | 250,353 | 206,209 |  |
Other expense |  |  |  |  |
Interest expense |  | 105,309 | 108,757 |  |
Net income |  | 216,222 | 209,170 |  |
Income from unconsolidated joint ventures |  | 1,791 | 14,834 |  |
Distribution related to excess loan proceeds |  | 0 | 24,527 |  |
Mortgage loan |  | 3,416,622 |  |  | $ 3,435,242
Unconsolidated Joint Ventures [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Total revenue | [1] | 37,669 | 39,532 |  |
Expenses |  |  |  |  |
Operating |  | 16,667 | 16,275 |  |
Depreciation and amortization |  | 9,064 | 9,071 |  |
Total expenses |  | 25,731 | 25,346 |  |
Operating income |  | 11,938 | 14,186 |  |
Other expense |  |  |  |  |
Interest expense |  | 8,389 | 7,980 |  |
Net income |  | 3,549 | 6,206 |  |
Company's share of net income |  | 1,599 | 14,642 | [2] |
Basis differential |  | 192 | 192 |  |
Income from unconsolidated joint ventures |  | 1,791 | 14,834 |  |
Straight-line rent adjustments |  | 2,200 | 1,600 |  |
Mortgage loan |  | $ 829,089 |  |  | $ 830,125
BP/CRF 901 New York Avenue LLC [Member] |  |  |  |  |
Other expense |  |  |  |  |
Distribution related to excess loan proceeds |  |  | 24,500 |  |
Mortgage loan |  |  | $ 225,000 |  |
[1] | Includes straight-line rent adjustments of approximately $2.2 million and $1.6 million for the three months ended March 31, 2016 and 2015, respectively.
[2] | During the three months ended March 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 three months ended March 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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