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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Allowances $ 5,738 $ 4,796
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized 5,000,000 5,000,000
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 47,577,000 45,778,000
Common stock, shares outstanding 38,432,000 36,633,000
Treasury stock, shares outstanding 9,145,000 9,145,000
Preferred stock, shares issued 0 0