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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. 27, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Document Period End Date |  |  |  |  |  | Jun. 30, 2019 |  |
Total revenue |  |  | $ 733,741 |  | $ 664,484 | $ 1,459,508 |  | $ 1,325,635
Expenses |  |  |  |  |  |  |  |
Depreciation and amortization |  |  | 177,411 |  | 156,417 | 342,005 |  | 322,214
Total expenses |  |  | 482,353 |  | 433,860 | 957,944 |  | 886,859
Other expense |  |  |  |  |  |  |  |
Interest expense |  |  | (102,357) |  | (92,204) | (203,366) |  | (182,424)
Gains (loss) on sales of real estate |  |  | 1,686 |  | 18,292 | 781 |  | 114,689
Net income |  |  | 203,461 |  | 160,565 | 334,620 |  | 376,877
Income from unconsolidated joint ventures |  |  | 47,964 |  | 769 | 48,177 |  | 1,230
Unconsolidated Joint Ventures [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Total revenue | [1] |  | 80,204 |  | 57,096 | 163,159 |  | 113,582
Expenses |  |  |  |  |  |  |  |
Operating |  |  | 30,134 |  | 22,868 | 60,633 |  | 45,717
Depreciation and amortization |  |  | 24,818 |  | 14,527 | 53,464 |  | 29,252
Total expenses |  |  | 54,952 |  | 37,395 | 114,097 |  | 74,969
Other expense |  |  |  |  |  |  |  |
Interest expense |  |  | (20,803) |  | (14,708) | (41,560) |  | (29,132)
Gains (loss) on sales of real estate |  |  | 34,572 | [2] | 0 | 34,572 | [2] | 0
Net income |  |  | 39,021 |  | 4,993 | 42,074 |  | 9,481
Company's share of net income (loss) |  |  | 22,376 |  | 2,105 | 23,960 |  | 3,931
Basis differential | [2],[3] |  | 25,588 |  | (1,336) | 24,217 |  | (2,701)
Income from unconsolidated joint ventures |  |  | 47,964 |  | 769 | 48,177 |  | 1,230
Straight-line rent adjustments |  |  | 7,600 |  | 3,200 | 13,400 |  | 5,000
540 Madison Venture LLC [Member] |  |  |  |  |  |  |  |
Other expense |  |  |  |  |  |  |  |
Equity Method Investment, Realized Gain (Loss) on Disposal |  | $ 47,800 |  |  |  |  |  |
Colorado Center [Member] | Unconsolidated Joint Ventures [Member] |  |  |  |  |  |  |  |
Other expense |  |  |  |  |  |  |  |
Straight-line rent adjustments |  |  | 500 |  | 700 | 1,100 |  | 1,400
"Above" and "below" market rent adjustments, net |  |  | $ 400 |  | $ 400 | $ 800 |  | $ 800
[1] | Includes straight-line rent adjustments of approximately $7.6 million and $3.2 million for the three months ended June 30, 2019 and 2018, respectively, and $13.4 million and $5.0 million for the six months ended June 30, 2019 and 2018, respectively.
[2] | Represents the total gain on sale of 540 Madison Avenue recognized by the joint venture, as described below. During 2008, the Company recognized an other-than-temporary impairment loss on its investment in the unconsolidated joint venture resulting in a basis differential between the carrying value of the Company’s investment in the joint venture and the joint venture’s basis in the assets and liabilities of the property. As a result of the historical basis difference, the Company recognized a gain on sale of real estate totaling approximately $47.8 million, which consists of its share of the gain on sale reported by the joint venture as well as an adjustment for the basis differential. The gain on sale is included in Income from Unconsolidated Joint Ventures in the Company’s Consolidated Statements of Operations.
[3] | Includes straight-line rent adjustments of approximately $0.5 million and $0.7 million for the three months ended June 30, 2019 and 2018, respectively, and $1.1 million and $1.4 million for the six months ended June 30, 2019 and 2018, 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, 2019 and 2018, respectively, and $0.8 million and $0.8 million for the six months ended June 30, 2019 and 2018, respectively

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