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Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Accumulated Other Comprehensive Income or Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  |  | $ (14,114) |  | $ (9,304) |  | $ (9,304)
Effective portion of interest rate contracts |  | $ (32,351) |  | $ 15,639 |  | (90,997) |  | 12,106 |  |
Amortization of interest rate contracts | [1] | 628 |  | 628 |  | 1,255 | [2] | 1,255 | [2] |
Other comprehensive loss attributable to noncontrolling interests |  | 8,681 |  | (2,512) |  | 24,108 |  | (2,209) |  |
Ending Balance |  | (79,748) |  | 1,848 |  | (79,748) |  | 1,848 |  | (14,114)
Boston Properties Limited Partnership |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income or Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  |  | (18,337) |  | (12,973) |  | (12,973)
Effective portion of interest rate contracts |  | (32,351) |  | 15,639 |  | (90,997) |  | 12,106 |  |
Amortization of interest rate contracts |  | 628 | [3] | 628 | [3] | 1,255 | [2] | 1,255 | [2] |
Other comprehensive loss attributable to noncontrolling interests |  |  |  |  |  | 16,547 |  | (916) |  |
Ending Balance |  | $ (91,532) |  | $ (528) |  | $ (91,532) |  | $ (528) |  | $ (18,337)
[1] | Amounts reclassified from comprehensive income primarily to interest expense within the Boston Properties, Inc.’s Consolidated Statements of Operations.
[2] | Consists of amounts from previous interest rate hedging programs entered into prior to 2015.
[3] | Amounts reclassified from comprehensive income primarily to interest expense within the Boston Properties Limited Partnership's Consolidated Statements of Operations.

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- Definition Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest for Property Partnerships + References No definition available. + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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