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Derivative and Hedging Instruments Derivative Instrument and Hedging Activities Notional Table (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Fair Value | $ (10,302) | $ 0 | $ 0
Interest Rate Swap [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, Notional Amount | 950,000 |  |
Fair Value | (10,302) |  |
Boston Properties Limited Partnership [Member] | Interest Rate Swap [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, Notional Amount | 550,000 |  |
Fair Value | (4,231) |  |
Boston Properties Limited Partnership [Member] | Interest Rate Swap [Member] | Interest Rate Swap Range 2.348% - 2.571% [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [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 [Member] | Interest Rate Swap [Member] | Interest Rate Swap Range 2.129% - 2.325% [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [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 Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, Notional Amount | 400,000 |  |
Fair Value | (6,071) |  |
767 Fifth Partners LLC [Member] | Interest Rate Swap [Member] | Interest Rate Swap Range 2.677% - 2.950% [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [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 Instruments and Hedging Activities Disclosures [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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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5580258-113959 + Details
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