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Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 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 | $ 91,624 | $ 497,496
Preferred Stock Redemption Charge | (6,412) | 0
Preferred dividends / distributions | (2,560) | (2,625)
Noncontrolling interest-common units of the Operating Partnership | (11,084) | (57,539)
Noncontrolling interest in property partnerships | (16,467) | (19,486)
Interest expense | (107,902) | (101,591)
Loss from early extinguishment of debt | 898 | 0
Company's share of net operating income from joint ventures | (443,947) | (471,653)
Depreciation and amortization expense | (176,565) | (171,094)
Transaction costs | (331) | (615)
General and administrative expense | (44,959) | (36,454)
Gains (losses) from investments in securities | (1,659) | 5,445
Interest and other income (loss) | (1,168) | (3,017)
Gains on sales of real estate | 0 | (410,165)
Income (loss) from unconsolidated joint ventures | (5,225) | 369
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 | 91,624 | 497,496
Preferred Stock Redemption Charge | 6,412 | 0
Preferred dividends / distributions | 2,560 | 2,625
Noncontrolling interest-common units of the Operating Partnership | 11,084 | 57,539
Noncontrolling interest in property partnerships | 16,467 | 19,486
Interest expense | 107,902 | 101,591
Loss from early extinguishment of debt | 898 | 0
Depreciation and amortization expense | 176,565 | 171,094
Transaction costs | 331 | 615
Operating expense | 3,505 | 3,237
General and administrative expense | 44,959 | 36,454
Gains (losses) from investments in securities | 1,659 | (5,445)
Interest and other income (loss) | 1,168 | 3,017
Gains on sales of real estate | 0 | 410,165
Income (loss) from unconsolidated joint ventures | 5,225 | (369)
Other revenue | 3,505 | 3,237
Company's share of Net Operating Income | 424,366 | 452,750
Unconsolidated Joint Ventures [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Interest expense | (25,556) | (22,583)
Company's share of net operating income from joint ventures | (24,795) | (28,758)
Depreciation and amortization expense | (34,103) | (32,035)
Transaction costs | (7) | 0
Income (loss) from unconsolidated joint ventures | (5,225) | 369
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 | 24,795 | 28,758
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 | 105,773 | 566,333
Preferred Stock Redemption Charge | (6,412) | 0
Preferred dividends / distributions | (2,560) | (2,625)
Noncontrolling interest in property partnerships | (16,467) | (19,486)
Interest expense | (107,902) | (101,591)
Loss from early extinguishment of debt | 898 | 0
Depreciation and amortization expense | (173,500) | (169,285)
Transaction costs | (331) | (615)
General and administrative expense | (44,959) | (36,454)
Gains (losses) from investments in securities | (1,659) | 5,445
Interest and other income (loss) | (1,168) | (3,017)
Gains on sales of real estate | 0 | (419,654)
Income (loss) from unconsolidated joint ventures | (5,225) | 369
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 | 105,773 | 566,333
Preferred Stock Redemption Charge | 6,412 | 0
Preferred dividends / distributions | 2,560 | 2,625
Noncontrolling interest in property partnerships | 16,467 | 19,486
Interest expense | 107,902 | 101,591
Loss from early extinguishment of debt | 898 | 0
Depreciation and amortization expense | 173,500 | 169,285
Transaction costs | 331 | 615
Operating expense | 3,505 | 3,237
General and administrative expense | 44,959 | 36,454
Gains (losses) from investments in securities | 1,659 | (5,445)
Interest and other income (loss) | 1,168 | 3,017
Gains on sales of real estate | 0 | 419,654
Income (loss) from unconsolidated joint ventures | 5,225 | (369)
Other revenue | 3,505 | 3,237
Company's share of Net Operating Income | 424,366 | 452,750
Management Service [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Other revenue | (6,803) | (7,879)
Management Service [Member] | Segment Reconciling Items |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Other revenue | 6,803 | 7,879
Management Service [Member] | Boston Properties Limited Partnership |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Operating expense | (3,505) | (3,237)
Other revenue | (6,803) | (7,879)
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 | 6,803 | 7,879
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 | 44,376 | 47,661
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 | 44,376 | 47,661
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 | $ 44,376 | $ 47,661

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