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Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Statement Of Financial Position [Abstract]    
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 60,000,000us-gaap_CommonStockSharesAuthorized 60,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 20,555,330us-gaap_CommonStockSharesIssued 20,555,330us-gaap_CommonStockSharesIssued
Deferred compensation trust, shares 108,614us-gaap_CommonStockSharesHeldInEmployeeTrustShares 109,256us-gaap_CommonStockSharesHeldInEmployeeTrustShares
Treasury stock, shares 16,506,229us-gaap_TreasuryStockShares 16,121,605us-gaap_TreasuryStockShares