Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues
Total revenues	$ 1,693,674	$ 1,375,218	$ 1,055,524
Cost of revenues
Operating expenses	223,699	169,806	130,475
Depreciation and amortization	52,591	42,935	31,411
Total cost of revenues	276,290	212,741	161,886
Administrative expenses
Sales and marketing	417,617	346,561	275,994
Research and development	198,951	148,343	118,426
General and administrative	288,137	239,130	209,840
Depreciation and amortization	61,357	49,764	35,811
Total administrative expenses	966,062	783,798	640,071
Total operating expenses	1,242,352	996,539	801,957
Operating income	451,322	378,679	253,567
Interest expense	(1,927)	(2,536)
Other income (expense), net	23,004	13,435	2,395
Income before income taxes	472,399	389,578	255,962
Provision for income taxes	131,611	108,189	60,002
Net income	$ 340,788	$ 281,389	$ 195,960
Earnings per share, basic	$ 5.91	$ 4.86	$ 3.39
Earnings per share, diluted	$ 5.88	$ 4.84	$ 3.37
Weighted average shares outstanding:
Basic	57,707	57,928	57,885
Diluted	57,974	58,175	58,191
Comprehensive earnings (loss):
Net income	$ 340,788	$ 281,389	$ 195,960
Unrealized net gains (losses) on available-for-sale securities	3,501	(4,757)
Tax effect	(837)	1,054
Other comprehensive income (loss), net of tax	2,664	(3,703)
Comprehensive earnings (loss)	343,452	277,686	195,960
Recurring [Member]
Revenues
Total revenues	1,664,976	1,351,856	1,036,691
Implementation and Other [Member]
Revenues
Total revenues	$ 28,698	$ 23,362	$ 18,833