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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Accounts and notes receivable, net of allowance for doubtful accounts $ 6,718 $ 7,573
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 100,000,000 100,000,000
Preferred stock, shares issued 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 225,000,000 225,000,000
Common stock, shares issued 151,929,565 150,869,239
Cost of common stock held in treasury, shares 16,341,311 16,418,710
Common stock held in employee benefit and compensation trusts, shares 87,206 76,095