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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Accounts receivable, reserve for credit losses $ 13,987 $ 13,832
Property, equipment and capitalized software, accumulated depreciation $ 224,075 $ 192,140
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 175,000,000 175,000,000
Common stock, shares issued (in shares) 47,171,000 43,079,000
Common stock, shares outstanding (in shares) 42,840,000 38,746,000
Treasury stock, shares (in shares) 4,428,000 4,428,000