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Consolidated Balance Sheets Parenthetical - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Trade receivables, allowances $ 945 $ 1,459
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, authorized 50,000,000 50,000,000
Preferred stock, outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, authorized 300,000,000 300,000,000
Common stock, issued 43,747,805 43,519,647
Treasury stock, shares 5,167,000 5,167,000