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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Accounts receivable (net of allowances of $59,147 in 2020 and $52,274 in 2019) $ 59,147 $ 52,274
Property, equipment and capitalized software (net of accumulated depreciation of $402,406 in 2020 and $344,212 in 2019) 402,406 344,212
Other intangible assets (net of accumulated amortization of $835,163 in 2020 and $666,793 in 2019) $ 835,163 $ 666,793
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) 48,616,000 47,749,000
Common stock, shares outstanding (in shares) 44,188,000 43,321,000
Treasury stock, shares (in shares) 4,428,000 4,428,000