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Investments in Unconsolidated Joint Ventures (Statements of Operations of the Joint Ventures) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]                      
Total revenue $ 757,501 $ 743,553 $ 733,741 $ 725,767 $ 705,157 $ 686,284 $ 664,484 $ 661,151 $ 2,960,562 $ 2,717,076 $ 2,602,076
Expenses                      
Transaction costs                 1,984 1,604 668
Depreciation and amortization                 677,764 645,649 617,547
Total expenses                 1,914,925 1,791,579 1,693,966
Other income (expense)                      
Gains on sales of real estate                 709 182,356 7,663
Interest expense                 (412,717) (378,168) (374,481)
Net income                 651,999 712,563 562,481
Income from unconsolidated joint ventures                 46,592 2,222 11,232
Straight-line rent adjustments                 58,400 51,900 54,800
Above and below market rent adjustments, net                 20,900 23,800 23,500
Unconsolidated Joint Ventures [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Total revenue [1]                 322,817 271,951 222,517
Expenses                      
Operating                 122,992 106,610 90,542
Transaction costs                 1,000 0 0
Depreciation and amortization                 102,296 103,079 [2] 57,079
Total expenses                 226,288 209,689 147,621
Other income (expense)                      
Gains on sales of real estate                 32,706 16,951 0
Interest expense                 (84,409) (71,308) (46,371)
Net income                 44,826 7,905 28,525
Company's share of net income                 24,423 8,084 18,439
Basis differential [4]                 22,169 [3] (5,862) (7,207)
Income from unconsolidated joint ventures                 46,592 2,222 11,232
Straight-line rent adjustments                 32,400 15,900 21,700
Metropolitan Square [Member]                      
Expenses                      
Depreciation and amortization                   22,400  
Metropolitan Square [Member] | Boston Properties, Inc. [Member]                      
Expenses                      
Depreciation and amortization                   4,500  
540 Madison Avenue [Member]                      
Other income (expense)                      
Gain on sale of real estate                 47,200    
Colorado Center [Member]                      
Other income (expense)                      
Straight-line rent adjustments                 2,100 2,400 1,900
Above and below market rent adjustments, net                 $ 1,700 $ 1,600 $ 2,900
[1]
Includes straight-line rent adjustments of approximately $32.4 million, $15.9 million and $21.7 million for the years ended December 31, 2019, 2018 and 2017, respectively.
[2]
During the year ended December 31, 2018, the joint venture that owns Metropolitan Square in Washington, DC, commenced a renovation project and recorded accelerated depreciation expense of approximately $22.4 million related to the remaining book value of the assets to be replaced. The Company’s share of the accelerated depreciation expense totaled approximately $4.5 million.
[3]
For the year ended December 31, 2019, represents the 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 $47.2 million for the year ended December 31, 2019, 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 of real estate is included in Income from Unconsolidated Joint Ventures in the Company’s Consolidated Statements of Operations.
[4] Includes straight-line rent adjustments of approximately $2.1 million, $2.4 million and $1.9 million for the years ended December 31, 2019, 2018 and 2017, respectively. Also includes net above-/below-market rent adjustments of approximately $1.7 million, $1.6 million and $2.9 million for the years ended December 31, 2019, 2018 and 2017, respectively.