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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, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total revenue |  | $ 632,228 | $ 665,985 |
Expenses |  |  |  |
Depreciation and amortization |  | 159,205 | 159,448 |
Total expenses |  | 426,003 | 415,632 |
Operating income |  | 206,225 | 250,353 |
Other expense |  |  |  |
Interest expense |  | 95,534 | 105,309 |
Net income |  | 115,564 | 216,222 |
Income from unconsolidated joint ventures |  | 3,084 | 1,791 |
Mortgage notes payable, net |  | 2,046,959 |  | $ 2,063,087
Unconsolidated Joint Ventures [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total revenue | [1] | 54,761 | 37,669 |
Expenses |  |  |  |
Operating |  | 22,079 | 16,667 |
Depreciation and amortization |  | 14,309 | 9,064 |
Total expenses |  | 36,388 | 25,731 |
Operating income |  | 18,373 | 11,938 |
Other expense |  |  |  |
Interest expense |  | 9,300 | 8,389 |
Net income |  | 9,073 | 3,549 |
Company's share of net income |  | 4,323 | 1,599 |
Basis differential | [2] | (1,239) | 192 |
Income from unconsolidated joint ventures |  | 3,084 | 1,791 |
Straight-line rent adjustments |  | 7,000 | $ 2,200 |
Mortgage notes payable, net |  | 864,344 |  | $ 865,665
Colorado Center [Member] |  |  |  |
Other expense |  |  |  |
Straight-line rent adjustments |  | 700 |  |
"Above" and "below" market rent adjustments, net |  | $ 400 |  |
[1] | Includes straight-line rent adjustments of approximately $7.0 million and $2.2 million for the three months ended March 31, 2017 and 2016, respectively.
[2] | Includes a straight-line rent adjustment of approximately $0.7 million and a net above-/below-market rent adjustment of approximately $0.4 million for the three months ended March 31, 2017.

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