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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Accounts receivable, reserve for credit losses $ 50,575 $ 46,948
Property, equipment and capitalized software, accumulated depreciation 326,665 307,750
Accumulated amortization $ 582,422 $ 509,055
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) 47,701,000 47,557,000
Common stock, shares outstanding (in shares) 43,273,000 43,129,000
Treasury stock, shares (in shares) 4,428,000 4,428,000