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Derivative Instruments and Hedging Activities Derivative Instrument and Hedging Activities Notional Table (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015 | Jan. 06, 2016
Derivative [Line Items] |  |  |  |
Fair Value | $ (58,646) | $ (3,533) |  |
Interest Rate Swap [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount | 1,000,000 |  | $ 950,000 |
Fair Value | (68,948) |  | (10,302) |
Boston Properties Limited Partnership | Interest Rate Swap [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount | 550,000 |  | 550,000 |
Fair Value | (36,561) |  | (4,231) |
Boston Properties Limited Partnership | Interest Rate Swap [Member] | Interest Rate Swap Range 2.129% - 2.571% [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Liability, Notional Amount | $ 550,000 |  |  |
Derivative, Lower Fixed Interest Rate Range | 2.129% |  |  |
Derivative, Higher Fixed Interest Rate Range | 2.571% |  |  |
Fair Value | $ (36,561) |  |  |
Boston Properties Limited Partnership | Interest Rate Swap [Member] | Interest Rate Swap Range 2.348% - 2.571% [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Liability, Notional Amount |  |  | $ 400,000 |
Derivative, Lower Fixed Interest Rate Range |  |  | 2.348% |
Derivative, Higher Fixed Interest Rate Range |  |  | 2.571% |
Fair Value |  |  | $ (5,419) |
Boston Properties Limited Partnership | Interest Rate Swap [Member] | Interest Rate Swap Range 2.129% - 2.325% [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Asset, Notional Amount |  |  | $ 150,000 |
Derivative, Lower Fixed Interest Rate Range |  |  | 2.129% |
Derivative, Higher Fixed Interest Rate Range |  |  | 2.325% |
Fair Value |  |  | $ 1,188 |
767 Fifth Partners LLC [Member] | Interest Rate Swap [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount | 450,000 |  | 400,000 | $ 50,000
Fair Value | (32,387) |  | (6,071) |
767 Fifth Partners LLC [Member] | Interest Rate Swap [Member] | Interest Rate Swap Range 2.336% - 2.950% [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Liability, Notional Amount | $ 450,000 |  |  |
Derivative, Lower Fixed Interest Rate Range | 2.336% |  |  |
Derivative, Higher Fixed Interest Rate Range | 2.95% |  |  |
Fair Value | $ (32,387) |  |  |
767 Fifth Partners LLC [Member] | Interest Rate Swap [Member] | Interest Rate Swap Range 2.677% - 2.950% [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Liability, Notional Amount |  |  | $ 250,000 |
Derivative, Lower Fixed Interest Rate Range |  |  | 2.677% |
Derivative, Higher Fixed Interest Rate Range |  |  | 2.95% |
Fair Value |  |  | $ (7,247) |
767 Fifth Partners LLC [Member] | Interest Rate Swap [Member] | Interest Rate Swap Range 2.336% - 2.430% [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Asset, Notional Amount |  |  | $ 150,000 |
Derivative, Lower Fixed Interest Rate Range |  |  | 2.336% |
Derivative, Higher Fixed Interest Rate Range |  |  | 2.43% |
Fair Value |  |  | $ 1,176 |

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