XML 64 R47.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Derivative Instruments and Hedging Activities Derivative Instrument and Hedging Activities Notional Table (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
Derivative [Line Items] |  |  |  |  |
Fair Value | $ (32,351) | $ 15,639 | $ (90,997) | $ 12,106 |
Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | 1,000,000 |  | 1,000,000 |  | $ 950,000
Fair Value |  |  | (101,299) |  | (10,302)
Boston Properties Limited Partnership | Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | 550,000 |  | 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 |  | $ 550,000 |  |
Derivative, Lower Fixed Interest Rate Range | 2.129% |  | 2.129% |  |
Derivative, Higher Fixed Interest Rate Range | 2.571% |  | 2.571% |  |
Fair Value |  |  | $ (53,861) |  |
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 |  | 450,000 |  | 400,000
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 |  | $ 450,000 |  |
Derivative, Lower Fixed Interest Rate Range | 2.336% |  | 2.336% |  |
Derivative, Higher Fixed Interest Rate Range | 2.95% |  | 2.95% |  |
Fair Value |  |  | $ (47,438) |  |
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

X
- 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
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | us-gaap_DerivativeAssetNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition High end of the range of fixed interest rates when a range is presented for a group of interest rate derivatives. + References No definition available. + Details
Name: | us-gaap_DerivativeHigherFixedInterestRateRange
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: 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 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 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeLiabilityNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Low end of the range of fixed interest rates when a range is presented for a group of interest rate derivatives. + References No definition available. + Details
Name: | us-gaap_DerivativeLowerFixedInterestRateRange
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
Name: | us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bxp_HedgingIssuerAxis=us-gaap_SubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeByNatureAxis=bxp_InterestRateSwapRangetwopointonetwoninepercenttotwopointfivesevenonepercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeByNatureAxis=bxp_InterestRateSwapRangetwopointthreefoureightpercenttotwopointfivesevenonepercentMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeByNatureAxis=bxp_InterestRateSwapRangetwopointonetwoninepercenttotwopointthreetwofivepercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bxp_HedgingIssuerAxis=bxp_SevensixsevenFifthPartnersLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeByNatureAxis=bxp_InterestRateSwapRangetwopointthreethreesixpercenttotwopointninefivezeropercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeByNatureAxis=bxp_InterestRateSwapRangetwopointsixsevensevenpercenttotwopointninefivezeropercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeByNatureAxis=bxp_InterestRateSwapRangetwopointthreethreesixpercenttotwopointfourthreezeropercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |