Derivative Instruments and Hedging Activities- Effects of Derivative Instruments in Accumulated Other Comprehensive Income (Details) - Derivatives Designated as Hedging Instruments - Interest Rate Swap Contracts $ in Thousands  | 
9 Months Ended | 
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 Sep. 30, 2015  
USD ($) 
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| Derivative Instruments, Gain (Loss) [Line Items] | |
| Loss Recognized in Accumulated Other Comprehensive Loss | $ 1,672 | 
| Interest Expense Reclassified from Accumulated Other Comprehensive Loss into Other Expenses, Net | $ 1,153 | 
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- 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. No definition available. 
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- Definition The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition The effective portion of losses on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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