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Consolidated Balance Sheet (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Preferred stock, shares authorized 10,000,000us-gaap_PreferredStockSharesAuthorized 10,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value $ 0.10us-gaap_CommonStockParOrStatedValuePerShare $ 0.10us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 100,000,000us-gaap_CommonStockSharesAuthorized 100,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares outstanding 63,820,126us-gaap_CommonStockSharesOutstanding 62,534,636us-gaap_CommonStockSharesOutstanding
Treasury stock, shares 317,103us-gaap_TreasuryStockShares 219,304us-gaap_TreasuryStockShares