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Derivative and Hedging Instruments Derivatives and Hedging Activities Notional Table (Tables) | 12 Months Ended
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Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] | Boston Properties Limited Partnership’s and 767 Fifth Avenue Partners LLC’s interest rate swap contracts consisted of the following at December 31, 2015 (dollars in thousands):
Derivative Instrument |  | Aggregate Notional Amount |  | Effective Date |  | Maturity Date |  | Strike Rate Range |  | Balance Sheet Location |  | Fair Value
|  |  |  | Low |  | High |  |
Boston Properties Limited Partnership: |  |  |  |  |  |  |  |  |  |
Interest Rate Swaps |  | $ | 400,000 |  |  | September 1, 2016 |  | September 1, 2026 |  | 2.348 | % | - | 2.571 | % |  | Other Liabilities |  | $ | (5,419 | )
Interest Rate Swaps |  | 150,000 |  |  | September 1, 2016 |  | September 1, 2026 |  | 2.129 | % | - | 2.325 | % |  | Prepaid Expenses and Other Assets |  | 1,188 |
|  | $ | 550,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ | (4,231 | )
767 Fifth Partners LLC: |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Swaps |  | $ | 250,000 |  |  | June 7, 2017 |  | June 7, 2027 |  | 2.677 | % | - | 2.950 | % |  | Other Liabilities |  | $ | (7,247 | )
Interest Rate Swaps |  | 150,000 |  |  | June 7, 2017 |  | June 7, 2027 |  | 2.336 | % | - | 2.430 | % |  | Prepaid Expenses and Other Assets |  | 1,176 |
|  | $ | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ | (6,071 | )
|  | $ | 950,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ | (10,302 | )
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The following table presents the location in the financial statements of the losses recognized related to the Company’s cash flow hedges for the years ended December 31, 2015, 2014 and 2013:
|  | Year ended December 31,
|  | 2015 |  | 2014 |  | 2013
|  | (in thousands)
Amount of loss related to the effective portion recognized in other comprehensive loss |  | $ | (10,302 | ) |  | $ | — |  |  | $ | — |
Amount of loss related to the effective portion subsequently reclassified to earnings (1) |  | $ | (2,510 | ) |  | $ | (2,508 | ) |  | $ | (2,513 | )
Amount of gain (loss) related to the ineffective portion and amount excluded from effectiveness testing |  | $ | — |  |  | $ | — |  |  | $ | — |
___________
(1) | Consists of amounts from interest rate hedging programs entered into prior to 2015.
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Boston Properties, Inc. The following table reflects the changes in accumulated other comprehensive loss for Boston Properties, Inc. for the years ended December 31, 2015, 2014 and 2013 (in thousands):
Balance at December 31, 2012 |  | $ | (13,817 | )
Amortization of interest rate contracts (1) |  | 2,513 |
Other comprehensive income attributable to noncontrolling interests |  | (252 | )
Balance at December 31, 2013 |  | (11,556 | )
Amortization of interest rate contracts (1) |  | 2,508 |
Other comprehensive income attributable to noncontrolling interests |  | (256 | )
Balance at December 31, 2014 |  | (9,304 | )
Effective portion of interest rate contracts |  | (10,302 | )
Amortization of interest rate contracts (1) |  | 2,510 |
Other comprehensive loss attributable to noncontrolling interests |  | 2,982 |
Balance at December 31, 2015 |  | $ | (14,114 | )
___________
(1) |
Boston Properties Limited Partnership [Member] |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Boston Properties Limited Partnership The following table reflects the changes in accumulated other comprehensive loss for Boston Properties Limited Partnership for the years ended December 31, 2015, 2014 and 2013 (in thousands):
Balance at December 31, 2012 |  | $ | (17,994 | )
Amortization of interest rate contracts (1) |  | 2,513 |
Balance at December 31, 2013 |  | (15,481 | )
Amortization of interest rate contracts (1) |  | 2,508 |
Balance at December 31, 2014 |  | (12,973 | )
Effective portion of interest rate contracts |  | (10,302 | )
Amortization of interest rate contracts (1) |  | 2,510 |
Other comprehensive loss attributable to noncontrolling interests in property partnership |  | 2,428 |
Balance at December 31, 2015 |  | $ | (18,337 | )
___________
(1) | Consists of amounts from interest rate hedging programs entered into prior to 2015.

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