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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Total revenue |  | $ 686,284 |  | $ 657,712 | $ 2,011,919 | $ 1,946,847
Expenses |  |  |  |  |  |
Depreciation and amortization |  | 157,996 |  | 152,164 | 480,210 | 463,288
Total expenses |  | 447,920 |  | 423,983 | 1,334,779 | 1,268,203
Operating income |  | 238,364 |  | 233,729 | 677,140 | 678,644
Other expense |  |  |  |  |  |
Interest expense |  | 95,366 |  | 92,032 | 277,790 | 282,709
Net income (loss) |  | 150,445 |  | 147,704 | 527,322 | 430,278
Income (loss) from unconsolidated joint ventures |  | (4,313) |  | 843 | (3,083) | 7,035
Unconsolidated Joint Ventures [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Total revenue | [1] | 76,177 |  | 55,516 | 189,759 | 166,139
Expenses |  |  |  |  |  |
Operating |  | 29,522 |  | 23,128 | 75,239 | 67,310
Depreciation and amortization |  | 44,993 | [2] | 16,440 | 74,245 | 44,973
Total expenses |  | 74,515 |  | 39,568 | 149,484 | 112,283
Operating income |  | 1,662 |  | 15,948 | 40,275 | 53,856
Other expense |  |  |  |  |  |
Interest expense |  | 19,861 |  | 13,088 | 48,993 | 31,815
Net income (loss) |  | (18,199) |  | 2,860 | (8,718) | 22,041
Company's share of net income (loss) |  | (2,858) |  | 2,909 | 1,073 | 11,576
Basis differential | [3] | (1,455) |  | (2,066) | (4,156) | (4,541)
Income (loss) from unconsolidated joint ventures |  | (4,313) |  | 843 | (3,083) | 7,035
Straight-line rent adjustments |  | 4,800 |  | 5,100 | 9,800 | 16,400
The Metropolitan Square Associates LLC [Member] |  |  |  |  |  |
Expenses |  |  |  |  |  |
Depreciation and amortization |  | 22,400 |  |  |  |
The Metropolitan Square Associates LLC [Member] | BXP [Member] |  |  |  |  |  |
Expenses |  |  |  |  |  |
Depreciation and amortization |  | 4,500 |  |  |  |
Colorado Center [Member] | Unconsolidated Joint Ventures [Member] |  |  |  |  |  |
Other expense |  |  |  |  |  |
Straight-line rent adjustments |  | 500 |  | 700 | 1,900 | 2,200
"Above" and "below" market rent adjustments, net |  | $ 400 |  | $ 400 | $ 1,200 | $ 1,300
[1] | Includes straight-line rent adjustments of approximately $4.8 million and $5.1 million for the three months ended September 30, 2018 and 2017, respectively, and $9.8 million and $16.4 million for the nine months ended September 30, 2018 and 2017
[2] | During the three months ended September 30, 2018, the joint venture that owns Metropolitan Square, in Washington, DC, commenced a renovation project and recorded accelerated depreciation of approximately $22.4 million related to the remaining book value of the asset to be replaced. The Company's share of the accelerated depreciation totaled approximately $4.5 million.
[3] | Includes straight-line rent adjustments of approximately $0.5 million and $0.7 million for the three months ended September 30, 2018 and 2017, respectively, and $1.9 million and $2.2 million for the nine months ended September 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 September 30, 2018 and 2017, respectively, and $1.2 million and $1.3 million for the nine months ended September 30, 2018 and 2017

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