Segment and Related Information - Reconciliation of Operating Income from Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information
Total segment operating income	$ 56,184	$ 49,656	$ 132,683	$ 124,890
Amortization of acquired software	(263,657)	(142,237)	(636,266)	(429,535)
Amortization of customer and trade name intangibles	(14,183)	(5,392)	(31,015)	(16,176)
Interest expense	(5,396)	(254)	(18,311)	(757)
Other income, net	445	534	1,249	2,497
Income before income taxes	51,233	49,936	115,621	126,630
Acquired software
Segment Reporting Information
Amortization of acquired software	(12,896)	(7,965)	(32,683)	(23,998)
Operating segment and corporate non-segment
Segment Reporting Information
Total segment operating income	$ 83,263	$ 63,013	$ 196,381	$ 165,064