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Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities (Tables) | 3 Months Ended
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Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] | 767 Fifth Partners LLC’s interest rate swap contracts consisted of the following at March 31, 2017 (dollars in thousands):
Derivative Instrument |  | Aggregate Notional Amount |  | Effective Date |  | Maturity Date |  | Strike Rate Range |  | Balance Sheet Location |  | Fair Value
|  |  |  | Low |  | High |  |
Interest Rate Swaps |  | $ | 325,000 |  |  | June 7, 2017 |  | June 7, 2027 |  | 2.423 | % | - | 2.950 | % |  | Other Liabilities |  | $ | (8,635 | )
Interest Rate Swaps |  | 125,000 |  |  | June 7, 2017 |  | June 7, 2027 |  | 2.336 | % | - | 2.418 | % |  | Prepaid Expenses and Other Assets |  | 551 |
|  | $ | 450,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ | (8,084 | )
767 Fifth Avenue Partners LLC’s interest rate swap contracts consisted of the following at December 31, 2016 (dollars in thousands):
Derivative Instrument |  | Aggregate Notional Amount |  | Effective Date |  | Maturity Date |  | Strike Rate Range |  | Balance Sheet Location |  | Fair Value
|  |  |  | Low |  | High |  |
Interest Rate Swaps |  | $ | 350,000 |  |  | June 7, 2017 |  | June 7, 2027 |  | 2.418 | % | - | 2.950 | % |  | Other Liabilities |  | $ | (8,773 | )
Interest Rate Swaps |  | 100,000 |  |  | June 7, 2017 |  | June 7, 2027 |  | 2.336 | % | - | 2.388 | % |  | Prepaid Expenses and Other Assets |  | 509 |
|  | $ | 450,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ | (8,264 | )
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 gains (losses) recognized related to the Company’s cash flow hedges for the three months ended March 31, 2017 and 2016:
|  | Three months ended March 31,
|  | 2017 |  | 2016
|  | (in thousands)
Amount of gain (loss) related to the effective portion recognized in other comprehensive loss |  | $ | 180 |  |  | $ | (58,646 | )
Amount of loss related to the effective portion subsequently reclassified to earnings |  | $ | (1,306 | ) |  | $ | (627 | )
Amount of (gain) loss related to the ineffective portion and amount excluded from effectiveness testing |  | $ | — |  |  | $ | — |
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 three months ended March 31, 2017 and 2016 (in thousands):
Balance at December 31, 2016 |  | $ | (52,251 | )
Effective portion of interest rate contracts |  | 180 |
Amortization of interest rate contracts |  | 1,306 |
Other comprehensive loss attributable to noncontrolling interests |  | (218 | )
Balance at March 31, 2017 |  | $ | (50,983 | )
Balance at December 31, 2015 |  | $ | (14,114 | )
Effective portion of interest rate contracts |  | (58,646 | )
Amortization of interest rate contracts |  | 627 |
Other comprehensive income attributable to noncontrolling interests |  | 15,427 |
Balance at March 31, 2016 |  | $ | (56,706 | )
Boston Properties Limited Partnership The following table reflects the changes in accumulated other comprehensive loss for the three months ended March 31, 2017 and 2016 (in thousands):
Balance at December 31, 2016 |  | $ | (60,853 | )
Effective portion of interest rate contracts |  | 180 |
Amortization of interest rate contracts |  | 1,306 |
Other comprehensive loss attributable to noncontrolling interests |  | (72 | )
Balance at March 31, 2017 |  | $ | (59,439 | )
Balance at December 31, 2015 |  | $ | (18,337 | )
Effective portion of interest rate contracts |  | (58,646 | )
Amortization of interest rate contracts |  | 627 |
Other comprehensive income attributable to noncontrolling interests |  | 10,526 |
Balance at March 31, 2016 |  | $ | (65,830 | )

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- Definition Tabular disclosure of the effective portion of gains and losses on derivative instruments (and nonderivative instruments) designated and qualifying in cash flow hedges recorded in accumulated other comprehensive income (loss) during the term of the hedging relationship and reclassified into earnings during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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