Unaudited Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues
Total revenues	$ 242,146	$ 181,587	$ 514,344	$ 423,955
Cost of revenues
Operating expenses	28,773	23,257	57,846	47,373
Depreciation and amortization	7,637	6,301	14,837	12,231
Total cost of revenues	36,410	29,558	72,683	59,604
Administrative expenses
Sales and marketing	67,979	56,064	130,740	111,082
Research and development	28,224	21,778	52,935	43,399
General and administrative	54,063	40,837	100,254	80,971
Depreciation and amortization	8,380	6,774	16,096	13,059
Total administrative expenses	158,646	125,453	300,025	248,511
Total operating expenses	195,056	155,011	372,708	308,115
Operating income	47,090	26,576	141,636	115,840
Interest expense		(3)		(19)
Other income (expense), net	146	162	775	(768)
Income before income taxes	47,236	26,735	142,411	115,053
Provision (benefit) for income taxes	(5,042)	(1,854)	25,517	23,449
Net income	$ 52,278	$ 28,589	$ 116,894	$ 91,604
Earnings per share, basic	$ 0.90	$ 0.50	$ 2.02	$ 1.59
Earnings per share, diluted	$ 0.90	$ 0.49	$ 2.01	$ 1.57
Weighted average shares outstanding:
Basic	57,853	57,568	57,797	57,611
Diluted	58,092	58,237	58,135	58,363
Recurring [Member]
Revenues
Total revenues	$ 237,585	$ 177,950	$ 505,359	$ 416,445
Implementation and Other [Member]
Revenues
Total revenues	$ 4,561	$ 3,637	$ 8,985	$ 7,510