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Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Net income attributable to the Company's common shareholders / unitholders | $ 266,525 | $ 164,318 | $ 764,232 | $ 262,431
Preferred dividends / distributions | (2,625) | (2,625) | (5,250) | (5,250)
Noncontrolling interest-common units of the Operating Partnership | (30,197) | (19,036) | (87,525) | (30,627)
Noncontrolling interest in property partnerships | 767 | (17,482) | (18,719) | (36,312)
Interest expense | (107,142) | (102,357) | (208,733) | (203,366)
Company's share of net operating income from joint ventures | (402,404) | (454,301) | (874,057) | (902,016)
Depreciation and amortization expense | (178,188) | (177,411) | (349,282) | (342,005)
Transaction costs | (332) | (417) | (947) | (877)
General and administrative expense | (37,743) | (35,071) | (74,197) | (76,833)
Gains (losses) from investments in securities | (4,552) | (1,165) | 893 | (4,134)
Interest and other income (loss) | (1,305) | (3,615) | (4,322) | (7,368)
Gains on sales of real estate | (203,767) | (1,686) | (613,932) | (781)
Income from unconsolidated joint ventures | (1,832) | (47,964) | (1,463) | (48,177)
Business Intersegment, Eliminations [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Net income attributable to the Company's common shareholders / unitholders | 266,525 | 164,318 | 764,232 | 262,431
Preferred dividends / distributions | 2,625 | 2,625 | 5,250 | 5,250
Noncontrolling interest-common units of the Operating Partnership | 30,197 | 19,036 | 87,525 | 30,627
Noncontrolling interest in property partnerships | (767) | 17,482 | 18,719 | 36,312
Interest expense | 107,142 | 102,357 | 208,733 | 203,366
Impairment losses | 0 | 0 | 0 | 24,038
Depreciation and amortization expense | 178,188 | 177,411 | 349,282 | 342,005
Transaction costs | 332 | 417 | 947 | 877
Operating expense | 2,484 | 2,403 | 5,721 | 5,798
General and administrative expense | 37,743 | 35,071 | 74,197 | 76,833
Gains (losses) from investments in securities | 4,552 | 1,165 | (893) | 4,134
Interest and other income (loss) | 1,305 | 3,615 | 4,322 | 7,368
Gains on sales of real estate | 203,767 | 1,686 | 613,932 | 781
Income from unconsolidated joint ventures | 1,832 | 47,964 | 1,463 | 48,177
Other revenue | 2,484 | 2,403 | 5,721 | 5,798
Net Operating Income | 397,888 | 433,454 | 850,638 | 859,433
Unconsolidated Joint Ventures [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Interest expense | (23,306) | (20,803) | (45,889) | (41,560)
Company's share of net operating income from joint ventures | (27,911) | (24,715) | (56,669) | (50,064)
Depreciation and amortization expense | (37,390) | (24,818) | (69,425) | (53,464)
Gains on sales of real estate | (11,720) | (34,572) | (11,720) | (34,572)
Income from unconsolidated joint ventures | (1,832) | (47,964) | (1,463) | (48,177)
Unconsolidated Joint Ventures [Member] | Business Intersegment, Eliminations [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Company's share of net operating income from joint ventures | 27,911 | 24,715 | 56,669 | 50,064
Boston Properties Limited Partnership |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Net income attributable to the Company's common shareholders / unitholders | 301,975 | 185,715 | 868,308 | 299,097
Preferred dividends / distributions | (2,625) | (2,625) | (5,250) | (5,250)
Noncontrolling interest in property partnerships | 767 | (17,482) | (18,719) | (36,312)
Interest expense | (107,142) | (102,357) | (208,733) | (203,366)
Depreciation and amortization expense | (176,409) | (175,199) | (345,694) | (337,881)
Transaction costs | (332) | (417) | (947) | (877)
General and administrative expense | (37,743) | (35,071) | (74,197) | (76,833)
Gains (losses) from investments in securities | (4,552) | (1,165) | 893 | (4,134)
Interest and other income (loss) | (1,305) | (3,615) | (4,322) | (7,368)
Gains on sales of real estate | (207,241) | (1,835) | (626,895) | (930)
Income from unconsolidated joint ventures | (1,832) | (47,964) | (1,463) | (48,177)
Boston Properties Limited Partnership | Business Intersegment, Eliminations [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Net income attributable to the Company's common shareholders / unitholders | 301,975 | 185,715 | 868,308 | 299,097
Preferred dividends / distributions | 2,625 | 2,625 | 5,250 | 5,250
Noncontrolling interest in property partnerships | (767) | 17,482 | 18,719 | 36,312
Interest expense | 107,142 | 102,357 | 208,733 | 203,366
Impairment losses | 0 | 0 | 0 | 22,272
Depreciation and amortization expense | 176,409 | 175,199 | 345,694 | 337,881
Transaction costs | 332 | 417 | 947 | 877
Operating expense | 2,484 | 2,403 | 5,721 | 5,798
General and administrative expense | 37,743 | 35,071 | 74,197 | 76,833
Gains (losses) from investments in securities | 4,552 | 1,165 | (893) | 4,134
Interest and other income (loss) | 1,305 | 3,615 | 4,322 | 7,368
Gains on sales of real estate | 207,241 | 1,835 | 626,895 | 930
Income from unconsolidated joint ventures | 1,832 | 47,964 | 1,463 | 48,177
Other revenue | 2,484 | 2,403 | 5,721 | 5,798
Net Operating Income | 397,888 | 433,454 | 850,638 | 859,433
Management Service [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Other revenue | (8,125) | (9,986) | (16,004) | (19,263)
Management Service [Member] | Business Intersegment, Eliminations [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Other revenue | 8,125 | 9,986 | 16,004 | 19,263
Management Service [Member] | Boston Properties Limited Partnership |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Operating expense | (2,484) | (2,403) | (5,721) | (5,798)
Other revenue | (8,125) | (9,986) | (16,004) | (19,263)
Management Service [Member] | Boston Properties Limited Partnership | Business Intersegment, Eliminations [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Other revenue | 8,125 | 9,986 | 16,004 | 19,263
Noncontrolling interest - property partnerships [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Company's share of net operating income from joint ventures | 32,427 | 45,562 | 80,088 | 92,647
Noncontrolling interest - property partnerships [Member] | Business Intersegment, Eliminations [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Company's share of net operating income from joint ventures | 32,427 | 45,562 | 80,088 | 92,647
Noncontrolling interest - property partnerships [Member] | Boston Properties Limited Partnership | Business Intersegment, Eliminations [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Company's share of net operating income from joint ventures | $ 32,427 | $ 45,562 | $ 80,088 | $ 92,647

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