Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current Assets:
Receivables, allowance for doubtful accounts	$ 1,281	$ 1,201
Property and Equipment, accumulated depreciation	360,148	353,453
Capitalized software, accumulated amortization	454,776	442,677
Intangible assets, accumulated amortization	$ 9,694	$ 8,773
Stockholders' 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	147,903,000	149,745,000
Common stock, shares outstanding	147,903,000	149,745,000