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Derivative Financial Instruments and Hedging Activities - Narrative (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Derivative [Line Items]      
Deferred unrealized losses $ 8,800,000us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax $ 10,800,000us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax  
Deferred unrealized losses, tax 500,000us-gaap_OtherComprehensiveIncomeLossTax 700,000us-gaap_OtherComprehensiveIncomeLossTax  
Amortization of accumulated losses on cash flow hedges from AOCL to Other income (expense), net, projection (8,291,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax (10,026,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax  
Forecast [Member]      
Derivative [Line Items]      
Amortization of accumulated losses on cash flow hedges from AOCL to Other income (expense), net, projection     $ 1,800,000us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember