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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Statement Of Financial Position [Abstract]    
Common stock, par value $ 0.50us-gaap_CommonStockParOrStatedValuePerShare $ 0.50us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 75,000,000us-gaap_CommonStockSharesAuthorized 75,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 46,858,415us-gaap_CommonStockSharesIssued 47,680,516us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 46,858,415us-gaap_CommonStockSharesOutstanding 47,680,516us-gaap_CommonStockSharesOutstanding