Consolidated Statements Of Operations - 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	$ 1,456,755	$ 1,330,349	$ 2,844,533	$ 2,742,090
Costs and expenses:
Costs of revenue	261,325	211,963	491,981	466,379
Sales and client service	731,077	645,087	1,353,253	1,281,736
Software development (Includes amortization of $65,247 and $130,097 for the three and six months ended June 30, 2021, respectively; and $61,197 and $122,208 for the three and six months ended June 30, 2020, respectively)	241,600	178,955	433,927	364,275
General and administrative	156,307	134,332	268,672	274,184
Amortization of acquisition-related intangibles	16,886	13,114	29,082	30,242
Total costs and expenses	1,407,195	1,183,451	2,576,915	2,416,816
Operating earnings	49,560	146,898	267,618	325,274
Other income, net	(1,678)	24,632	(472)	30,227
Earnings before income taxes	47,882	171,530	267,146	355,501
Income taxes	(15,175)	(36,782)	(62,187)	(73,594)
Net earnings	$ 32,707	$ 134,748	$ 204,959	$ 281,907
Basic earnings per share	$ 0.11	$ 0.44	$ 0.68	$ 0.92
Diluted earnings per share	$ 0.11	$ 0.44	$ 0.67	$ 0.91
Basic weighted average shares outstanding	300,737	304,776	302,723	307,256
Diluted weighted average shares outstanding	303,591	306,717	305,802	309,520