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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Accounts and notes receivable, allowances $ 5,132 $ 5,026
Common stock, par value $ 0 $ 0
Common Stock, Shares Authorized 200,000,000 200,000,000
Common stock, shares outstanding 65,494,333 64,187,934