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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Development and management services income | $ 22,554 | $ 25,316 | $ 29,695
Income from unconsolidated joint ventures | 22,770 | 12,769 | 75,074
Gains on consolidation of joint ventures | 0 | 0 | 385,991
Interest and other income | 6,777 | 8,765 | 8,310
Gains (losses) from investments in securities | (653) | 1,038 | 2,911
Gains (losses) from early extinguishments of debt | (22,040) | (10,633) | 122
Income from discontinued operations | 0 | 0 | 8,022
Gain on sale of real estate from discontinued operations | 0 | 0 | 112,829
Gain on forgiveness of debt from discontinued operations | 0 | 0 | 20,182
General and administrative expense | 96,319 | 98,937 | 115,329
Transaction costs | 1,259 | 3,140 | 1,744
Depreciation and amortization expense | 639,542 | 628,573 | 560,637
Interest expense | 432,196 | 455,743 | 446,880
Impairment loss | 0 | 0 | 8,306
Impairment loss from discontinued operations | 0 | 0 | 3,241
Noncontrolling interest in property partnerships | 149,855 | 30,561 | 1,347
Noncontrolling interest - redeemable preferred units | 6 | 1,023 | 6,046
Noncontrolling interest-common units of the Operating Partnership | 66,951 | 50,862 | 70,085
Noncontrolling interest in discontinued operations-common units of the Operating Partnership | 0 | 0 | 14,151
Preferred dividends / distributions | 10,500 | 10,500 | 8,057
Net income attributable to the Company''s common shareholders / unitholders | 572,606 | 433,111 | 741,754
Business Intersegment, Eliminations [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Net Operating Income | 1,563,931 | 1,507,156 | 1,334,441
Development and management services income | 22,554 | 25,316 | 29,695
Income from unconsolidated joint ventures | 22,770 | 12,769 | 75,074
Gains on consolidation of joint ventures | 0 | 0 | 385,991
Interest and other income | 6,777 | 8,765 | 8,310
Gains (losses) from investments in securities | (653) | 1,038 | 2,911
Gains (losses) from early extinguishments of debt | (22,040) | (10,633) | 122
Income from discontinued operations | 0 | 0 | 8,022
Gain on sale of real estate from discontinued operations | 0 | 0 | 112,829
Gain on forgiveness of debt from discontinued operations | 0 | 0 | 20,182
Gains on sales of real estate | 375,895 | 168,039 | 0
General and administrative expense | 96,319 | 98,937 | 115,329
Transaction costs | 1,259 | 3,140 | 1,744
Depreciation and amortization expense | 639,542 | 628,573 | 560,637
Interest expense | 432,196 | 455,743 | 446,880
Impairment loss | 0 | 0 | 8,306
Impairment loss from discontinued operations | 0 | 0 | 3,241
Noncontrolling interest in property partnerships | 149,855 | 30,561 | 1,347
Noncontrolling interest - redeemable preferred units | 6 | 1,023 | 6,046
Noncontrolling interest-common units of the Operating Partnership | 66,951 | 50,862 | 70,085
Noncontrolling interest in discontinued operations-common units of the Operating Partnership | 0 | 0 | 14,151
Preferred dividends / distributions | 10,500 | 10,500 | 8,057
Net income attributable to the Company''s common shareholders / unitholders | 572,606 | 433,111 | 741,754
Boston Properties Limited Partnership [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Development and management services income | 22,554 | 25,316 | 29,695
Income from unconsolidated joint ventures | 22,770 | 12,769 | 75,074
Gains on consolidation of joint ventures | 0 | 0 | 385,991
Interest and other income | 6,777 | 8,765 | 8,310
Gains (losses) from investments in securities | (653) | 1,038 | 2,911
Gains (losses) from early extinguishments of debt | (22,040) | (10,633) | 122
Income from discontinued operations | 0 | 0 | 8,022
Gain on sale of real estate from discontinued operations | 0 | 0 | 115,459
Gain on forgiveness of debt from discontinued operations | 0 | 0 | 20,736
General and administrative expense | 96,319 | 98,937 | 115,329
Transaction costs | 1,259 | 3,140 | 1,744
Depreciation and amortization expense | 631,549 | 620,064 | 552,589
Interest expense | 432,196 | 455,743 | 446,880
Impairment loss | 0 | 0 | 4,401
Impairment loss from discontinued operations | 0 | 0 | 2,852
Noncontrolling interest in property partnerships | 149,855 | 30,561 | 1,347
Noncontrolling interest - redeemable preferred units | 6 | 1,023 | 6,046
Preferred dividends / distributions | 10,500 | 10,500 | 8,057
Net income attributable to the Company''s common shareholders / unitholders | 648,748 | 499,129 | 841,516
Boston Properties Limited Partnership [Member] | Business Intersegment, Eliminations [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Net Operating Income | 1,563,931 | 1,507,156 | 1,334,441
Development and management services income | 22,554 | 25,316 | 29,695
Income from unconsolidated joint ventures | 22,770 | 12,769 | 75,074
Gains on consolidation of joint ventures | 0 | 0 | 385,991
Interest and other income | 6,777 | 8,765 | 8,310
Gains (losses) from investments in securities | (653) | 1,038 | 2,911
Gains (losses) from early extinguishments of debt | (22,040) | (10,633) | 122
Income from discontinued operations | 0 | 0 | 8,022
Gain on sale of real estate from discontinued operations | 0 | 0 | 115,459
Gain on forgiveness of debt from discontinued operations | 0 | 0 | 20,736
Gains on sales of real estate | 377,093 | 174,686 | 0
General and administrative expense | 96,319 | 98,937 | 115,329
Transaction costs | 1,259 | 3,140 | 1,744
Depreciation and amortization expense | 631,549 | 620,064 | 552,589
Interest expense | 432,196 | 455,743 | 446,880
Impairment loss | 0 | 0 | 4,401
Impairment loss from discontinued operations | 0 | 0 | 2,852
Noncontrolling interest in property partnerships | 149,855 | 30,561 | 1,347
Noncontrolling interest - redeemable preferred units | 6 | 1,023 | 6,046
Preferred dividends / distributions | 10,500 | 10,500 | 8,057
Net income attributable to the Company''s common shareholders / unitholders | $ 648,748 | $ 499,129 | $ 841,516

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