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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