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Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Net income attributable to the Company's common shareholders / unitholders | $ 111,703,000 | $ 266,525,000 | $ 203,372,000 | $ 764,232,000
Preferred Stock Redemption Charge | 0 | 0 | (6,412,000) | 0
Preferred dividends / distributions | 0 | (2,625,000) | (2,560,000) | (5,250,000)
Noncontrolling interest-common units of the Operating Partnership | (12,383,000) | (30,197,000) | (23,422,000) | (87,525,000)
Noncontrolling interest in property partnerships | (17,164,000) | 767,000 | (33,631,000) | (18,719,000)
Interest expense | (106,319,000) | (107,142,000) | (214,221,000) | (208,733,000)
Loss from early extinguishment of debt | 0 | 0 | 898,000 | 0
Company's share of net operating income from joint ventures | (453,169,000) | (402,404,000) | (897,116,000) | (874,057,000)
Depreciation and amortization expense | (183,838,000) | (178,188,000) | (360,403,000) | (349,282,000)
Transaction costs | (751,000) | (332,000) | (1,082,000) | (947,000)
General and administrative expense | (38,405,000) | (37,743,000) | (83,364,000) | (74,197,000)
Gains (losses) from investments in securities | (2,275,000) | (4,552,000) | (3,934,000) | 893,000
Interest and other income (loss) | (1,452,000) | (1,305,000) | (2,620,000) | (4,322,000)
Gains on sales of real estate | (7,756,000) | (203,767,000) | (7,756,000) | (613,932,000)
Income (loss) from unconsolidated joint ventures | 1,373,000 | (1,832,000) | (3,852,000) | (1,463,000)
Segment Reconciling Items |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Net income attributable to the Company's common shareholders / unitholders | 111,703,000 | 266,525,000 | 203,372,000 | 764,232,000
Preferred Stock Redemption Charge | 0 | 0 | 6,412,000 | 0
Preferred dividends / distributions | 0 | 2,625,000 | 2,560,000 | 5,250,000
Noncontrolling interest-common units of the Operating Partnership | 12,383,000 | 30,197,000 | 23,422,000 | 87,525,000
Noncontrolling interest in property partnerships | 17,164,000 | (767,000) | 33,631,000 | 18,719,000
Interest expense | 106,319,000 | 107,142,000 | 214,221,000 | 208,733,000
Loss from early extinguishment of debt | 0 | 0 | 898,000 | 0
Depreciation and amortization expense | 183,838,000 | 178,188,000 | 360,403,000 | 349,282,000
Transaction costs | 751,000 | 332,000 | 1,082,000 | 947,000
Operating expense | 2,655,000 | 2,484,000 | 6,160,000 | 5,721,000
General and administrative expense | 38,405,000 | 37,743,000 | 83,364,000 | 74,197,000
Gains (losses) from investments in securities | 2,275,000 | 4,552,000 | 3,934,000 | (893,000)
Interest and other income (loss) | 1,452,000 | 1,305,000 | 2,620,000 | 4,322,000
Gains on sales of real estate | 7,756,000 | 203,767,000 | 7,756,000 | 613,932,000
Income (loss) from unconsolidated joint ventures | (1,373,000) | 1,832,000 | 3,852,000 | 1,463,000
Other revenue | 2,655,000 | 2,484,000 | 6,160,000 | 5,721,000
Company's share of Net Operating Income | 432,299,000 | 397,888,000 | 856,665,000 | 850,638,000
Unconsolidated Joint Ventures [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Interest expense | (25,636,000) | (23,306,000) | (51,192,000) | (45,889,000)
Depreciation and amortization expense | (33,627,000) | (37,390,000) | (67,730,000) | (69,425,000)
Transaction costs | 0 | 0 | (7,000) | 0
Gains on sales of real estate |  | (11,720,000) | 0 | (11,720,000)
Income (loss) from unconsolidated joint ventures | 1,373,000 | (1,832,000) | (3,852,000) | (1,463,000)
Unconsolidated Joint Ventures [Member] | Segment Reconciling Items |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Company's share of net operating income from joint ventures | 25,417,000 | 27,911,000 | 50,212,000 | 56,669,000
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 | 125,846,000 | 301,975,000 | 231,619,000 | 868,308,000
Preferred Stock Redemption Charge | 0 | 0 | (6,412,000) | 0
Preferred dividends / distributions | 0 | (2,625,000) | (2,560,000) | (5,250,000)
Noncontrolling interest in property partnerships | (17,164,000) | 767,000 | (33,631,000) | (18,719,000)
Interest expense | (106,319,000) | (107,142,000) | (214,221,000) | (208,733,000)
Loss from early extinguishment of debt | 0 | 0 | 898,000 | 0
Depreciation and amortization expense | (182,078,000) | (176,409,000) | (355,578,000) | (345,694,000)
Transaction costs | (751,000) | (332,000) | (1,082,000) | (947,000)
General and administrative expense | (38,405,000) | (37,743,000) | (83,364,000) | (74,197,000)
Gains (losses) from investments in securities | (2,275,000) | (4,552,000) | (3,934,000) | 893,000
Interest and other income (loss) | (1,452,000) | (1,305,000) | (2,620,000) | (4,322,000)
Gains on sales of real estate | (7,756,000) | (207,241,000) | (7,756,000) | (626,895,000)
Income (loss) from unconsolidated joint ventures | 1,373,000 | (1,832,000) | (3,852,000) | (1,463,000)
Boston Properties Limited Partnership | Segment Reconciling Items |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Net income attributable to the Company's common shareholders / unitholders | 125,846,000 | 301,975,000 | 231,619,000 | 868,308,000
Preferred Stock Redemption Charge | 0 | 0 | 6,412,000 | 0
Preferred dividends / distributions | 0 | 2,625,000 | 2,560,000 | 5,250,000
Noncontrolling interest in property partnerships | 17,164,000 | (767,000) | 33,631,000 | 18,719,000
Interest expense | 106,319,000 | 107,142,000 | 214,221,000 | 208,733,000
Loss from early extinguishment of debt | 0 | 0 | 898,000 | 0
Depreciation and amortization expense | 182,078,000 | 176,409,000 | 355,578,000 | 345,694,000
Transaction costs | 751,000 | 332,000 | 1,082,000 | 947,000
Operating expense | 2,655,000 | 2,484,000 | 6,160,000 | 5,721,000
General and administrative expense | 38,405,000 | 37,743,000 | 83,364,000 | 74,197,000
Gains (losses) from investments in securities | 2,275,000 | 4,552,000 | 3,934,000 | (893,000)
Interest and other income (loss) | 1,452,000 | 1,305,000 | 2,620,000 | 4,322,000
Gains on sales of real estate | 7,756,000 | 207,241,000 | 7,756,000 | 626,895,000
Income (loss) from unconsolidated joint ventures | (1,373,000) | 1,832,000 | 3,852,000 | 1,463,000
Other revenue | 2,655,000 | 2,484,000 | 6,160,000 | 5,721,000
Company's share of Net Operating Income | 432,299,000 | 397,888,000 | 856,665,000 | 850,638,000
Management Service [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Other revenue | (7,284,000) | (8,125,000) | (14,087,000) | (16,004,000)
Management Service [Member] | Segment Reconciling Items |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Other revenue | 7,284,000 | 8,125,000 | 14,087,000 | 16,004,000
Management Service [Member] | Boston Properties Limited Partnership |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Other revenue | (7,284,000) | (8,125,000) | (14,087,000) | (16,004,000)
Management Service [Member] | Boston Properties Limited Partnership | Segment Reconciling Items |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Other revenue | 7,284,000 | 8,125,000 | 14,087,000 | 16,004,000
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 | 46,287,000 | 32,427,000 | 90,663,000 | 80,088,000
Noncontrolling interest - property partnerships [Member] | Segment Reconciling Items |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Company's share of net operating income from joint ventures | 46,287,000 | 32,427,000 | 90,663,000 | 80,088,000
Noncontrolling interest - property partnerships [Member] | Boston Properties Limited Partnership | Segment Reconciling Items |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Company's share of net operating income from joint ventures | $ 46,287,000 | $ 32,427,000 | $ 90,663,000 | $ 80,088,000

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