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Consolidated Statement Of Shareholders' Equity (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Statement of Stockholders' Equity [Abstract]  
Adjustment to pension benefit liability, taxes $ 2rock_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentTax1
Adjustment to post-retirement health care benefit liability, taxes (23)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Reclassification of loss cash flow hedges, taxes $ 82us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax