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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Total revenue |  | $ 656,907 | $ 623,546 | $ 1,289,135 | $ 1,289,531 |
Expenses |  |  |  |  |  |
Depreciation and amortization |  | 151,919 | 153,175 | 311,124 | 312,623 |
Total expenses |  | 418,217 | 405,422 | 844,220 | 821,054 |
Operating income |  | 238,690 | 218,124 | 444,915 | 468,477 |
Other expense |  |  |  |  |  |
Interest expense |  | 95,143 | 105,003 | 190,677 | 210,312 |
Losses on Extinguishment of Debt |  | (14,354) | 0 | (14,354) | 0 |
Net income |  | 167,010 | 117,357 | 282,574 | 333,579 |
Income from unconsolidated joint ventures |  | 3,108 | 2,234 | 6,192 | 4,025 |
Mortgage notes payable, net |  | 2,986,283 |  | 2,986,283 |  | $ 2,063,087
Unconsolidated Joint Ventures [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Total revenue | [1] | 55,862 | 38,368 | 110,623 | 76,037 |
Expenses |  |  |  |  |  |
Operating |  | 22,103 | 16,359 | 44,182 | 33,026 |
Depreciation and amortization |  | 14,224 | 9,204 | 28,533 | 18,268 |
Total expenses |  | 36,327 | 25,563 | 72,715 | 51,294 |
Operating income |  | 19,535 | 12,805 | 37,908 | 24,743 |
Other expense |  |  |  |  |  |
Interest expense |  | 9,427 | 8,383 | 18,727 | 16,772 |
Net income |  | 10,108 | 4,422 | 19,181 | 7,971 |
Company's share of net income |  | 4,344 | 2,052 | 8,667 | 3,651 |
Basis differential | [2] | (1,236) | 182 | (2,475) | 374 |
Income from unconsolidated joint ventures |  | 3,108 | 2,234 | 6,192 | 4,025 |
Straight-line rent adjustments |  | 4,300 | $ 3,600 | 11,300 | $ 5,800 |
Mortgage notes payable, net |  | 863,981 |  | 863,981 |  | $ 865,665
Colorado Center [Member] | Unconsolidated Joint Ventures [Member] |  |  |  |  |  |
Other expense |  |  |  |  |  |
Straight-line rent adjustments |  | 800 |  | 1,500 |  |
"Above" and "below" market rent adjustments, net |  | $ 400 |  | $ 900 |  |
[1] | Includes straight-line rent adjustments of approximately $4.3 million and $3.6 million for the three months ended June 30, 2017 and 2016, respectively and $11.3 million and $5.8 million for the six months ended June 30, 2017 and 2016, respectively.
[2] | Includes straight-line rent adjustments of approximately $0.8 million and $1.5 million for the three and six months ended June 30, 2017, respectively, and net above-/below-market rent adjustments of approximately $0.4 million and $0.9 million for the three and six months ended June 30, 2017, respectively.

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