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Investments in Unconsolidated Joint Ventures (Statements of Operations of the Joint Ventures) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Total revenue |  | $ 657,712 | $ 625,228 | $ 1,946,847 | $ 1,914,759 |
Expenses |  |  |  |  |  |
Depreciation and amortization |  | 152,164 | 203,748 | 463,288 | 516,371 |
Total expenses |  | 423,983 | 467,623 | 1,268,203 | 1,288,677 |
Operating income |  | 233,729 | 157,605 | 678,644 | 626,082 |
Other expense |  |  |  |  |  |
Interest expense |  | 92,032 | 104,641 | 282,709 | 314,953 |
Losses on Extinguishment of Debt |  | 0 | 371 | (14,354) | 371 |
Net income |  | 147,704 | 71,504 | 430,278 | 405,083 |
Income from unconsolidated joint ventures |  | 843 | 1,464 | 7,035 | 5,489 |
Mortgage notes payable, net |  | 2,982,067 |  | 2,982,067 |  | $ 2,063,087
Unconsolidated Joint Ventures [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Total revenue | [1] | 55,516 | 49,002 | 166,139 | 125,039 |
Expenses |  |  |  |  |  |
Operating |  | 23,128 | 21,753 | 67,310 | 54,779 |
Depreciation and amortization |  | 16,440 | 12,038 | 44,973 | 30,306 |
Total expenses |  | 39,568 | 33,791 | 112,283 | 85,085 |
Operating income |  | 15,948 | 15,211 | 53,856 | 39,954 |
Other expense |  |  |  |  |  |
Interest expense |  | 13,088 | 8,400 | 31,815 | 25,172 |
Net income |  | 2,860 | 6,811 | 22,041 | 14,782 |
Company's share of net income |  | 2,909 | 3,179 | 11,576 | 6,830 |
Basis differential | [2] | (2,066) | (1,715) | (4,541) | (1,341) |
Income from unconsolidated joint ventures |  | 843 | 1,464 | 7,035 | 5,489 |
Straight-line rent adjustments |  | 5,100 | 5,200 | 16,400 | 11,000 |
Mortgage notes payable, net |  | 1,411,401 |  | 1,411,401 |  | $ 865,665
Colorado Center [Member] | Unconsolidated Joint Ventures [Member] |  |  |  |  |  |
Other expense |  |  |  |  |  |
Straight-line rent adjustments |  | 700 | 700 | 2,200 | 700 |
"Above" and "below" market rent adjustments, net |  | $ 400 | $ 500 | $ 1,300 | $ 500 |
[1] | Includes straight-line rent adjustments of approximately $5.1 million and $5.2 million for the three months ended September 30, 2017 and 2016, respectively, and $16.4 million and $11.0 million for the nine months ended September 30, 2017 and 2016, respectively.
[2] | Includes straight-line rent adjustments of approximately $0.7 million and $0.7 million for the three months ended September 30, 2017 and 2016, respectively, and $2.2 million and $0.7 million for the nine months ended September 30, 2017 and 2016, respectively. Also includes net above-/below-market rent adjustments of approximately $0.4 million and $0.5 million for the three months ended September 30, 2017 and 2016, respectively, and $1.3 million and $0.5 million for the nine months ended September 30, 2017 and 2016, respectively.

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