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Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Net income attributable to the Company's common shareholders / unitholders | $ 451,939 | $ 502,285 | $ 572,606
Preferred dividends / distributions | (10,500) | (10,500) | (10,500)
Noncontrolling interest-common units of the Operating Partnership | (52,210) | (59,260) | (66,951)
Noncontrolling interest - redeemable preferred units | 0 | 0 | (6)
Noncontrolling interest in property partnerships | (47,832) | 2,068 | (149,855)
Losses from interest rate contracts | 0 | (140) | 0
Interest expense | (374,481) | (412,849) | (432,196)
Depreciation and amortization expense | (617,547) | (694,403) | (639,542)
Impairment loss | 0 | (1,783) | 0
Transaction costs | (668) | (2,387) | (1,259)
General and administrative expense | (113,715) | (105,229) | (96,319)
Gains (losses) from early extinguishments of debt | (496) | 371 | 22,040
Gains (losses) from investments in securities | (3,678) | (2,273) | 653
Interest and other income | (5,783) | (7,230) | (6,777)
Gain on sale of investment in unconsolidated joint venture | 0 | (59,370) | 0
Income from unconsolidated joint ventures | (11,232) | (8,074) | (22,770)
Development and management services income | (34,605) | (28,284) | (22,554)
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 | 451,939 | 502,285 | 572,606
Preferred dividends / distributions | 10,500 | 10,500 | 10,500
Noncontrolling interest-common units of the Operating Partnership | 52,210 | 59,260 | 66,951
Noncontrolling interest - redeemable preferred units | 0 | 0 | 6
Noncontrolling interest in property partnerships | 47,832 | (2,068) | 149,855
Losses from interest rate contracts | 0 | 140 | 0
Interest expense | 374,481 | 412,849 | 432,196
Depreciation and amortization expense | 617,547 | 694,403 | 639,542
Impairment loss | 0 | 1,783 | 0
Transaction costs | 668 | 2,387 | 1,259
General and administrative expense | 113,715 | 105,229 | 96,319
Gains on sales of real estate | 7,663 | 80,606 | 375,895
Gains (losses) from early extinguishments of debt | 496 | (371) | (22,040)
Gains (losses) from investments in securities | 3,678 | 2,273 | (653)
Interest and other income | 5,783 | 7,230 | 6,777
Gain on sale of investment in unconsolidated joint venture | 0 | 59,370 | 0
Income from unconsolidated joint ventures | 11,232 | 8,074 | 22,770
Development and management services income | 34,605 | 28,284 | 22,554
Net Operating Income | 1,605,435 | 1,601,302 | 1,563,931
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 | 512,866 | 575,341 | 648,748
Preferred dividends / distributions | (10,500) | (10,500) | (10,500)
Noncontrolling interest - redeemable preferred units | 0 | 0 | (6)
Noncontrolling interest in property partnerships | (47,832) | 2,068 | (149,855)
Losses from interest rate contracts | 0 | (140) | 0
Interest expense | (374,481) | (412,849) | (432,196)
Depreciation and amortization expense | (609,407) | (682,776) | (631,549)
Impairment loss | 0 | (1,783) | 0
Transaction costs | (668) | (2,387) | (1,259)
General and administrative expense | (113,715) | (105,229) | (96,319)
Gains (losses) from early extinguishments of debt | (496) | 371 | 22,040
Gains (losses) from investments in securities | (3,678) | (2,273) | 653
Interest and other income | (5,783) | (7,230) | (6,777)
Gain on sale of investment in unconsolidated joint venture | 0 | (59,370) | 0
Income from unconsolidated joint ventures | (11,232) | (8,074) | (22,770)
Development and management services income | (34,605) | (28,284) | (22,554)
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 | 512,866 | 575,341 | 648,748
Preferred dividends / distributions | 10,500 | 10,500 | 10,500
Noncontrolling interest - redeemable preferred units | 0 | 0 | 6
Noncontrolling interest in property partnerships | 47,832 | (2,068) | 149,855
Losses from interest rate contracts | 0 | 140 | 0
Interest expense | 374,481 | 412,849 | 432,196
Depreciation and amortization expense | 609,407 | 682,776 | 631,549
Impairment loss | 0 | 1,783 | 0
Transaction costs | 668 | 2,387 | 1,259
General and administrative expense | 113,715 | 105,229 | 96,319
Gains on sales of real estate | 8,240 | 82,775 | 377,093
Gains (losses) from early extinguishments of debt | 496 | (371) | (22,040)
Gains (losses) from investments in securities | 3,678 | 2,273 | (653)
Interest and other income | 5,783 | 7,230 | 6,777
Gain on sale of investment in unconsolidated joint venture | 0 | 59,370 | 0
Income from unconsolidated joint ventures | 11,232 | 8,074 | 22,770
Development and management services income | 34,605 | 28,284 | 22,554
Net Operating Income | $ 1,605,435 | $ 1,601,302 | $ 1,563,931

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