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Share-Based Compensation (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share-Based Compensation    
Total share-based compensation expense $ 210,000us-gaap_AllocatedShareBasedCompensationExpense $ 265,000us-gaap_AllocatedShareBasedCompensationExpense
Total income tax benefit recognized 58,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 70,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Non-employee members of Board of Directors    
Share-Based Compensation    
Fair value of stock granted to a member of the Board of Directors as a part of annual retainer   $ 5,000us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember