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Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities (Tables) | 6 Months Ended
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Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
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 June 30, 2016 (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 |  | $ | 550,000 |  |  | September 1, 2016 |  | September 1, 2026 |  | 2.129 | % | - | 2.571 | % |  | Other Liabilities |  | $ | (53,861 | )
767 Fifth Partners LLC: |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Swaps |  | $ | 450,000 |  |  | June 7, 2017 |  | June 7, 2027 |  | 2.336 | % | - | 2.950 | % |  | Other Liabilities |  | $ | (47,438 | )
|  | $ | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ | (101,299 | )
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 three and six months ended June 30, 2016 and 2015:
|  | Three months ended June 30, |  | Six months ended June 30,
|  | 2016 |  | 2015 |  | 2016 |  | 2015
|  | (in thousands)
Amount of income (loss) related to the effective portion recognized in other comprehensive loss |  | $ | (32,351 | ) |  | $ | 15,639 |  |  | $ | (90,997 | ) |  | $ | 12,106 |
Amount of loss related to the effective portion subsequently reclassified to earnings (1) |  | $ | (628 | ) |  | $ | (628 | ) |  | $ | (1,255 | ) |  | $ | (1,255 | )
Amount of gain (loss) related to the ineffective portion and amount excluded from effectiveness testing |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
___________
(1) | Consists of amounts from previous 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 the six months ended June 30, 2016 and 2015 (in thousands):
Balance at December 31, 2015 |  | $ | (14,114 | )
Effective portion of interest rate contracts |  | (90,997 | )
Amortization of interest rate contracts (1) |  | 1,255 |
Other comprehensive loss attributable to noncontrolling interests |  | 24,108 |
Balance at June 30, 2016 |  | $ | (79,748 | )
Balance at December 31, 2014 |  | $ | (9,304 | )
Effective portion of interest rate contracts |  | 12,106 |
Amortization of interest rate contracts (1) |  | 1,255 |
Other comprehensive income attributable to noncontrolling interests |  | (2,209 | )
Balance at June 30, 2015 |  | $ | 1,848 |
___________
(1) | Consists of amounts from previous interest rate hedging programs entered into prior to 2015.
Boston Properties Limited Partnership The following table reflects the changes in accumulated other comprehensive loss for the six months ended June 30, 2016 and 2015 (in thousands):
Balance at December 31, 2015 |  | $ | (18,337 | )
Effective portion of interest rate contracts |  | (90,997 | )
Amortization of interest rate contracts (1) |  | 1,255 |
Other comprehensive loss attributable to noncontrolling interests |  | 16,547 |
Balance at June 30, 2016 |  | $ | (91,532 | )
Balance at December 31, 2014 |  | $ | (12,973 | )
Effective portion of interest rate contracts |  | 12,106 |
Amortization of interest rate contracts (1) |  | 1,255 |
Other comprehensive income attributable to noncontrolling interests |  | (916 | )
Balance at June 30, 2015 |  | $ | (528 | )
___________
(1) | Consists of amounts from previous interest rate hedging programs entered into prior to 2015.

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