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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Accounts receivable, reserves $ 11,246 $ 10,258
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 220,000,000 220,000,000
Common stock, shares issued (in shares) 117,180,000 117,025,000
Treasury stock, at cost, shares (in shares) 2,358,000 2,219,000