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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, 2018 | Dec. 31, 2017 | Dec. 31, 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 | $ 572,347 | $ 451,939 | $ 502,285
Preferred dividends / distributions | (10,500) | (10,500) | (10,500)
Noncontrolling interest-common units of the Operating Partnership | (66,807) | (52,210) | (59,260)
Noncontrolling interest in property partnerships | (62,909) | (47,832) | 2,068
Losses from interest rate contracts | 0 | 0 | (140)
Interest expense | (378,168) | (374,481) | (412,849)
Impairment losses | (11,812) | 0 | (1,783)
Depreciation and amortization expense | (645,649) | (617,547) | (694,403)
Transaction costs | (1,604) | (668) | (2,387)
Payroll and related costs from management services contracts | (9,590) | 0 | 0
General and administrative expense | (121,722) | (113,715) | (105,229)
Gains (losses) from early extinguishments of debt | 16,490 | (496) | 371
Gains (losses) from investments in securities | 1,865 | (3,678) | (2,273)
Interest and other income | (10,823) | (5,783) | (7,230)
Gain on sale of investment in unconsolidated joint venture | 0 | 0 | (59,370)
Income from unconsolidated joint ventures | (2,222) | (11,232) | (8,074)
Direct reimbursements of payroll and related costs from management services contracts | (9,590) | 0 | 0
Development and management services revenue | (45,158) | (34,605) | (28,284)
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 | 572,347 | 451,939 | 502,285
Preferred dividends / distributions | 10,500 | 10,500 | 10,500
Noncontrolling interest-common units of the Operating Partnership | 66,807 | 52,210 | 59,260
Noncontrolling interest in property partnerships | 62,909 | 47,832 | (2,068)
Losses from interest rate contracts | 0 | 0 | 140
Interest expense | 378,168 | 374,481 | 412,849
Impairment losses | 11,812 | 0 | 1,783
Depreciation and amortization expense | 645,649 | 617,547 | 694,403
Transaction costs | 1,604 | 668 | 2,387
Payroll and related costs from management services contracts | 9,590 | 0 | 0
General and administrative expense | 121,722 | 113,715 | 105,229
Gains (losses) from early extinguishments of debt | (16,490) | 496 | (371)
Gains (losses) from investments in securities | (1,865) | 3,678 | 2,273
Interest and other income | 10,823 | 5,783 | 7,230
Gains on sales of real estate | 182,356 | 7,663 | 80,606
Gain on sale of investment in unconsolidated joint venture | 0 | 0 | 59,370
Income from unconsolidated joint ventures | 2,222 | 11,232 | 8,074
Direct reimbursements of payroll and related costs from management services contracts | 9,590 | 0 | 0
Development and management services revenue | 45,158 | 34,605 | 28,284
Net Operating Income | 1,649,314 | 1,605,435 | 1,601,302
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 | 656,903 | 512,866 | 575,341
Preferred dividends / distributions | (10,500) | (10,500) | (10,500)
Noncontrolling interest in property partnerships | (62,909) | (47,832) | 2,068
Losses from interest rate contracts | 0 | 0 | (140)
Interest expense | (378,168) | (374,481) | (412,849)
Impairment losses | (10,181) | 0 | (1,783)
Depreciation and amortization expense | (637,891) | (609,407) |
Transaction costs | (1,604) | (668) | (2,387)
Payroll and related costs from management services contracts | (9,590) | 0 | 0
General and administrative expense | (121,722) | (113,715) | (105,229)
Gains (losses) from early extinguishments of debt | 16,490 | (496) | 371
Gains (losses) from investments in securities | 1,865 | (3,678) | (2,273)
Interest and other income | (10,823) | (5,783) | (7,230)
Gain on sale of investment in unconsolidated joint venture | 0 | 0 | (59,370)
Income from unconsolidated joint ventures | (2,222) | (11,232) | (8,074)
Direct reimbursements of payroll and related costs from management services contracts | (9,590) | 0 | 0
Development and management services revenue | (45,158) | (34,605) | (28,284)
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 | 656,903 | 512,866 | 575,341
Preferred dividends / distributions | 10,500 | 10,500 | 10,500
Noncontrolling interest in property partnerships | 62,909 | 47,832 | (2,068)
Losses from interest rate contracts | 0 | 0 | 140
Interest expense | 378,168 | 374,481 | 412,849
Impairment losses | 10,181 | 0 | 1,783
Depreciation and amortization expense | 637,891 | 609,407 | 682,776
Transaction costs | 1,604 | 668 | 2,387
Payroll and related costs from management services contracts | 9,590 | 0 | 0
General and administrative expense | 121,722 | 113,715 | 105,229
Gains (losses) from early extinguishments of debt | (16,490) | 496 | (371)
Gains (losses) from investments in securities | (1,865) | 3,678 | 2,273
Interest and other income | 10,823 | 5,783 | 7,230
Gains on sales of real estate | 190,716 | 8,240 | 82,775
Gain on sale of investment in unconsolidated joint venture | 0 | 0 | 59,370
Income from unconsolidated joint ventures | 2,222 | 11,232 | 8,074
Direct reimbursements of payroll and related costs from management services contracts | 9,590 | 0 | 0
Development and management services revenue | 45,158 | 34,605 | 28,284
Net Operating Income | $ 1,649,314 | $ 1,605,435 | $ 1,601,302

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