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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Total revenue |  | $ 664,484 | $ 656,907 | $ 1,325,635 | $ 1,289,135
Expenses |  |  |  |  |
Depreciation and amortization |  | 156,417 | 151,919 | 322,214 | 311,124
Total expenses |  | 433,860 | 418,217 | 886,859 | 844,220
Operating income |  | 230,624 | 238,690 | 438,776 | 444,915
Other expense |  |  |  |  |
Interest expense |  | 92,204 | 95,143 | 182,424 | 190,677
Net income |  | 160,565 | 167,010 | 376,877 | 282,574
Income from unconsolidated joint ventures |  | 769 | 3,108 | 1,230 | 6,192
Unconsolidated Joint Ventures [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Total revenue | [1] | 57,096 | 55,862 | 113,582 | 110,623
Expenses |  |  |  |  |
Operating |  | 22,868 | 22,103 | 45,717 | 44,182
Depreciation and amortization |  | 14,527 | 14,224 | 29,252 | 28,533
Total expenses |  | 37,395 | 36,327 | 74,969 | 72,715
Operating income |  | 19,701 | 19,535 | 38,613 | 37,908
Other expense |  |  |  |  |
Interest expense |  | 14,708 | 9,427 | 29,132 | 18,727
Net income |  | 4,993 | 10,108 | 9,481 | 19,181
Company's share of net income |  | 2,105 | 4,344 | 3,931 | 8,667
Basis differential | [2] | (1,336) | (1,236) | (2,701) | (2,475)
Income from unconsolidated joint ventures |  | 769 | 3,108 | 1,230 | 6,192
Straight-line rent adjustments |  | 3,200 | 4,300 | 5,000 | 11,300
Colorado Center [Member] | Unconsolidated Joint Ventures [Member] |  |  |  |  |
Other expense |  |  |  |  |
Straight-line rent adjustments |  | 700 | 800 | 1,400 | 1,500
"Above" and "below" market rent adjustments, net |  | $ 400 | $ 400 | $ 800 | $ 900
[1] | Includes straight-line rent adjustments of approximately $3.2 million and $4.3 million for the three months ended June 30, 2018 and 2017, respectively, and $5.0 million and $11.3 million for the six months ended June 30, 2018 and 2017
[2] | Includes straight-line rent adjustments of approximately $0.7 million and $0.8 million for the three months ended June 30, 2018 and 2017, respectively, and $1.4 million and $1.5 million for the six months ended June 30, 2018 and 2017, respectively. Also includes net above-/below-market rent adjustments of approximately $0.4 million and $0.4 million for the three months ended June 30, 2018 and 2017, respectively, and $0.8 million and $0.9 million for the six months ended June 30, 2018 and 2017

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