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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Accounts receivable, allowance $ 3,328 $ 3,291
Preferred stock, shares authorized 20,000,000 20,000,000
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 180,000,000 180,000,000
Common stock, shares issued 58,410,419 57,672,401
Treasury stock, shares 10,375,257 10,166,801