Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Receivables, allowance for doubtful accounts	$ 3,188	$ 1,100
Property and equipment, accumulated depreciation	394,743	378,639
Capitalized Software, accumulated amortization	518,514	491,739
Intangible Assets, accumulated amortization	$ 14,573	$ 12,456
Shareholders' Equity:
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	141,027,000	143,396,000
Common stock, shares outstanding	141,027,000	143,396,000