Condensed Consolidated Statements Of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues:
Revenue	$ 732,901	$ 732,476	$ 2,200,741	$ 2,172,033
Cost of net revenues:
Total cost of net revenues	126,918	103,917	344,870	320,952
Gross margin	605,983	628,559	1,855,871	1,851,081
Operating expenses:
Research and development	126,420	111,557	390,712	323,050
Sales, marketing and services	274,874	262,562	847,958	800,505
General and administrative	80,042	86,084	238,751	227,151
Amortization of other intangible assets	4,937	4,063	11,671	11,748
Restructuring	8,879	(486)	16,022	13,138
Total operating expenses	495,152	463,780	1,505,114	1,375,592
Income from operations	110,831	164,779	350,757	475,489
Interest income	2,649	10,896	16,193	29,029
Interest expense	(8,822)	(19,962)	(37,144)	(60,840)
Other income (expense), net	3,456	3,702	3,735	(1,847)
Income before income taxes	108,114	159,415	333,541	441,831
Income tax (benefit) expense	(162,743)	558	(141,159)	31,882
Net income	$ 270,857	$ 158,857	$ 474,700	$ 409,949
Earnings per share:
Basic earnings per share (in dollars per share)	$ 2.08	$ 1.18	$ 3.62	$ 3.00
Diluted earnings per share (in dollars per share)	$ 2.04	$ 1.08	$ 3.48	$ 2.80
Weighted average shares outstanding:
Basic (in shares)	130,277	135,055	131,020	136,752
Diluted (in shares)	132,655	147,568	136,297	146,554
Subscription [Member]
Revenues:
Revenue	$ 159,873	$ 111,539	$ 457,312	$ 325,493
Product and License [Member]
Revenues:
Revenue	131,057	170,952	406,733	523,707
Cost of net revenues:
Cost of net revenues	27,411	27,571	75,033	91,150
Support and Services [Member]
Revenues:
Revenue	441,971	449,985	1,336,696	1,322,833
Subscription, Support and Service [Member]
Cost of net revenues:
Cost of net revenues	76,885	64,717	227,130	195,625
Product [Member]
Cost of net revenues:
Amortization and impairment of product related intangible assets	$ 22,622	$ 11,629	$ 42,707	$ 34,177