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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts (in dollars) $ 2,491 $ 1,761
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (shares) 100,000,000 100,000,000
Common stock, shares issued (shares) 51,201,000 50,388,000
Common stock, shares outstanding (shares) 46,142,000 45,292,000
Treasury stock, shares (shares) 5,059,000 5,096,000