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Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Consolidated Statements of Shareholders' Equity      
Issuance of common stock related to share-based payment awards, income tax benefit $ 1,028us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation $ 3,301us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation $ 3,681us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation