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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
shares in Thousands, $ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Accounts receivable, reserves $ 10,049 $ 10,258
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 220,000 220,000
Common stock, shares issued (in shares) 117,249 117,025
Treasury stock, at cost, shares (in shares) 2,503 2,219