Unaudited Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues
Total revenues	$ 316,924	$ 242,146	$ 670,443	$ 514,344
Cost of revenues
Operating expenses	39,604	28,773	78,096	57,846
Depreciation and amortization	10,478	7,637	20,470	14,837
Total cost of revenues	50,082	36,410	98,566	72,683
Administrative expenses
Sales and marketing	87,724	67,979	162,720	130,740
Research and development	36,803	28,224	68,408	52,935
General and administrative	57,912	54,063	118,416	100,254
Depreciation and amortization	12,090	8,380	23,753	16,096
Total administrative expenses	194,529	158,646	373,297	300,025
Total operating expenses	244,611	195,056	471,863	372,708
Operating income	72,313	47,090	198,580	141,636
Interest expense	(354)		(569)
Other income (expense), net	878	146	2,290	775
Income before income taxes	72,837	47,236	200,301	142,411
Provision for income taxes	15,482	(5,042)	51,016	25,517
Net income	$ 57,355	$ 52,278	$ 149,285	$ 116,894
Earnings per share, basic	$ 0.99	$ 0.90	$ 2.57	$ 2.02
Earnings per share, diluted	$ 0.99	$ 0.90	$ 2.57	$ 2.01
Weighted average shares outstanding:
Basic	57,969	57,853	57,992	57,797
Diluted	58,067	58,092	58,186	58,135
Comprehensive earnings (loss):
Net income	$ 57,355	$ 52,278	$ 149,285	$ 116,894
Unrealized net gains (losses) on available-for-sale securities	(654)		(2,176)
Tax effect	173		576
Other comprehensive income (loss), net of tax	(481)		(1,600)
Comprehensive earnings (loss)	56,874	52,278	147,685	116,894
Recurring [Member]
Revenues
Total revenues	311,534	237,585	659,698	505,359
Implementation and Other [Member]
Revenues
Total revenues	$ 5,390	$ 4,561	$ 10,745	$ 8,985