Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues
Total revenues	$ 1,375,218	$ 1,055,524	$ 841,434
Cost of revenues
Operating expenses	169,806	130,475	97,778
Depreciation and amortization	42,935	31,411	25,768
Total cost of revenues	212,741	161,886	123,546
Administrative expenses
Sales and marketing	346,561	275,994	235,716
Research and development	148,343	118,426	90,244
General and administrative	239,130	209,840	178,200
Depreciation and amortization	49,764	35,811	27,605
Total administrative expenses	783,798	640,071	531,765
Total operating expenses	996,539	801,957	655,311
Operating income	378,679	253,567	186,123
Interest expense	(2,536)		(19)
Other income (expense), net	13,435	2,395	(168)
Income before income taxes	389,578	255,962	185,936
Provision for income taxes	108,189	60,002	42,483
Net income	$ 281,389	$ 195,960	$ 143,453
Earnings per share, basic	$ 4.86	$ 3.39	$ 2.49
Earnings per share, diluted	$ 4.84	$ 3.37	$ 2.46
Weighted average shares outstanding:
Basic	57,928	57,885	57,620
Diluted	58,175	58,191	58,285
Comprehensive earnings (loss):
Net income	$ 281,389	$ 195,960	$ 143,453
Unrealized net gains (losses) on available-for-sale securities	(4,757)
Tax effect	1,054
Other comprehensive income (loss), net of tax	(3,703)
Comprehensive earnings (loss)	277,686	195,960	143,453
Recurring [Member]
Revenues
Total revenues	1,351,856	1,036,691	825,856
Implementation and Other [Member]
Revenues
Total revenues	$ 23,362	$ 18,833	$ 15,578