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Schedule of Interest Rate Swap Agreements on Accumulated Other Comprehensive Income (Details) (Interest Rate Swap, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Interest Rate Swap
   
Derivative Instruments And Hedging Activities Disclosures [Line Items]    
Beginning balance $ (111,174)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
$ (243,051)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Unrealized gain on interest rate swaps   15,030us-gaap_UnrealizedGainLossOnDerivatives
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Reclassification of net losses included in income statement 81,132us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
116,847us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Ending balance $ (30,042)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
$ (111,174)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember