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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Statement Of Income And Comprehensive Income [Abstract] |  |  |
Net income (loss) | $ 97,217 us-gaap_NetIncomeLoss | $ 81,618 us-gaap_NetIncomeLoss | $ 89,101 us-gaap_NetIncomeLoss
Other comprehensive income (loss) before taxes: |  |  |
Change in fair value of interest rate swap agreements | 4,655 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax | 17,143 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax | 2,722 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax
Change in pension actuarial income (loss) | (1,174)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax | 1,212 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax | (258)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
Total other comprehensive income (loss) before taxes | 3,481 us-gaap_OtherComprehensiveIncomeLossBeforeTax | 18,355 us-gaap_OtherComprehensiveIncomeLossBeforeTax | 2,464 us-gaap_OtherComprehensiveIncomeLossBeforeTax
Provision for income tax benefit (expense) related to components of other comprehensive income (loss) | (1,323)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 | (6,974)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 | (937)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Other comprehensive income (loss) | 2,158 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 11,381 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 1,527 us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income (loss) | $ 99,375 us-gaap_ComprehensiveIncomeNetOfTax | $ 92,999 us-gaap_ComprehensiveIncomeNetOfTax | $ 90,628 us-gaap_ComprehensiveIncomeNetOfTax

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