Condensed Consolidated Statements Of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues	$ 312,524	$ 306,408
Costs and expenses:
Cost of revenues	45,573	45,504
Sales and marketing	6,604	10,519
Research and development	17,358	16,132
General and administrative	36,725	34,001
Total costs and expenses	106,260	106,156
Operating income	206,264	200,252
Interest expense	(22,535)	(22,631)
Non-operating income (loss), net	7,084	12,203
Income before income taxes	190,813	189,824
Income tax expense	143,303	(27,297)
Net Income	334,116	162,527
Other comprehensive income (loss)	2,263	49
Comprehensive Income	$ 336,379	$ 162,576
Basic income (loss) per share
Net Income	$ 2.87	$ 1.36
Diluted income (loss) per share
Net Income	$ 2.86	$ 1.35
Shares used to compute net income per share
Basic	116,375	119,757
Diluted	116,730	120,317