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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Accounts and notes receivable, net of allowance for doubtful accounts $ 6,459 $ 7,471
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 153,050,285 152,821,011
Cost of common stock held in treasury, shares 15,877,371 15,922,729
Common stock held in employee benefit and compensation trusts, shares 72,679 80,967