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Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Net income attributable to the Company's common shareholders / unitholders | $ 117,337 | $ 76,753 | $ 348,086 | $ 355,114
Preferred Stock Dividends / Distributions | (2,625) | (2,589) | (7,875) | (7,796)
Noncontrolling interest-common units of the Operating Partnership | (13,402) | (9,387) | (40,350) | (42,120)
Noncontrolling interest in property partnerships | (14,340) | 17,225 | (33,967) | (53)
Interest expense | (92,032) | (104,641) | (282,709) | (314,953)
Losses from interest rate contracts | 0 | (140) | 0 | (140)
Depreciation and amortization expense | (152,164) | (203,748) | (463,288) | (516,371)
Impairment of Real Estate | 0 | (1,783) | 0 | (1,783)
Transaction costs | (239) | (249) | (572) | (1,187)
General and administrative expense | (25,792) | (25,165) | (84,319) | (79,936)
Gains (losses) from early extinguishments of debt | 0 | 371 | (14,354) | 371
Gains from investments in securities | (944) | (976) | (2,716) | (1,713)
Interest and other income | (1,329) | (3,628) | (3,447) | (6,657)
Income from unconsolidated joint ventures | (843) | (1,464) | (7,035) | (5,489)
Development and management services income | (10,811) | (6,364) | (24,648) | (18,586)
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 | 117,337 | 76,753 | 348,086 | 355,114
Preferred Stock Dividends / Distributions | 2,625 | 2,589 | 7,875 | 7,796
Noncontrolling interest-common units of the Operating Partnership | 13,402 | 9,387 | 40,350 | 42,120
Noncontrolling interest in property partnerships | 14,340 | (17,225) | 33,967 | 53
Interest expense | 92,032 | 104,641 | 282,709 | 314,953
Losses from interest rate contracts | 0 | 140 | 0 | 140
Depreciation and amortization expense | 152,164 | 203,748 | 463,288 | 516,371
Impairment of Real Estate | 0 | 1,783 | 0 | 1,783
Transaction costs | 239 | 249 | 572 | 1,187
General and administrative expense | 25,792 | 25,165 | 84,319 | 79,936
Gains on sales of real estate | 2,891 | 12,983 | 6,791 | 80,606
Gains (losses) from early extinguishments of debt | 0 | (371) | 14,354 | (371)
Gains from investments in securities | 944 | 976 | 2,716 | 1,713
Interest and other income | 1,329 | 3,628 | 3,447 | 6,657
Income from unconsolidated joint ventures | 843 | 1,464 | 7,035 | 5,489
Development and management services income | 10,811 | 6,364 | 24,648 | 18,586
Net Operating Income | 401,113 | 382,186 | 1,202,175 | 1,206,773
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 | 132,693 | 91,306 | 395,199 | 408,540
Preferred Stock Dividends / Distributions | (2,625) | (2,589) | (7,875) | (7,796)
Noncontrolling interest in property partnerships | (14,340) | 17,225 | (33,967) | (53)
Interest expense | (92,032) | (104,641) | (282,709) | (314,953)
Losses from interest rate contracts | 0 | (140) | 0 | (140)
Depreciation and amortization expense | (150,210) | (198,582) | (457,102) | (507,234)
Impairment of Real Estate | 0 | (1,783) | 0 | (1,783)
Transaction costs | (239) | (249) | (572) | (1,187)
General and administrative expense | (25,792) | (25,165) | (84,319) | (79,936)
Gains (losses) from early extinguishments of debt | 0 | 371 | (14,354) | 371
Gains from investments in securities | (944) | (976) | (2,716) | (1,713)
Interest and other income | (1,329) | (3,628) | (3,447) | (6,657)
Income from unconsolidated joint ventures | (843) | (1,464) | (7,035) | (5,489)
Development and management services income | (10,811) | (6,364) | (24,648) | (18,586)
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 | 132,693 | 91,306 | 395,199 | 408,540
Preferred Stock Dividends / Distributions | 2,625 | 2,589 | 7,875 | 7,796
Noncontrolling interest in property partnerships | 14,340 | (17,225) | 33,967 | 53
Interest expense | 92,032 | 104,641 | 282,709 | 314,953
Losses from interest rate contracts | 0 | 140 | 0 | 140
Depreciation and amortization expense | 150,210 | 198,582 | 457,102 | 507,234
Impairment of Real Estate | 0 | 1,783 | 0 | 1,783
Transaction costs | 239 | 249 | 572 | 1,187
General and administrative expense | 25,792 | 25,165 | 84,319 | 79,936
Gains on sales of real estate | 2,891 | 12,983 | 7,368 | 82,775
Gains (losses) from early extinguishments of debt | 0 | (371) | 14,354 | (371)
Gains from investments in securities | 944 | 976 | 2,716 | 1,713
Interest and other income | 1,329 | 3,628 | 3,447 | 6,657
Income from unconsolidated joint ventures | 843 | 1,464 | 7,035 | 5,489
Development and management services income | 10,811 | 6,364 | 24,648 | 18,586
Net Operating Income | $ 401,113 | $ 382,186 | $ 1,202,175 | $ 1,206,773

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