Unaudited Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues
Total revenues	$ 272,198	$ 242,368
Cost of revenues
Operating expenses	29,073	24,116
Depreciation and amortization	7,200	5,930
Total cost of revenues	36,273	30,046
Administrative expenses
Sales and marketing	62,761	55,018
Research and development	24,711	21,621
General and administrative	46,191	40,134
Depreciation and amortization	7,716	6,285
Total administrative expenses	141,379	123,058
Total operating expenses	177,652	153,104
Operating income	94,546	89,264
Interest expense		(16)
Other income (expense), net	629	(930)
Income before income taxes	95,175	88,318
Provision for income taxes	30,559	25,303
Net income	$ 64,616	$ 63,015
Earnings per share, basic	$ 1.12	$ 1.09
Earnings per share, diluted	$ 1.11	$ 1.08
Weighted average shares outstanding:
Basic	57,740	57,655
Diluted	58,394	58,440
Recurring [Member]
Revenues
Total revenues	$ 267,774	$ 238,495
Implementation and Other [Member]
Revenues
Total revenues	$ 4,424	$ 3,873