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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Preferred shares, par value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred shares, shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Common stock, par value $ 1.00us-gaap_CommonStockParOrStatedValuePerShare $ 1.00us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 200,000,000us-gaap_CommonStockSharesAuthorized 200,000,000us-gaap_CommonStockSharesAuthorized
Treasury stock, shares 14,304,348us-gaap_TreasuryStockShares 14,240,852us-gaap_TreasuryStockShares
Common stock, shares, outstanding 58,121,791us-gaap_CommonStockSharesOutstanding 58,185,267us-gaap_CommonStockSharesOutstanding
Common stock, shares issued 72,426,139us-gaap_CommonStockSharesIssued 72,426,139us-gaap_CommonStockSharesIssued