Condensed Consolidated Statements Of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Revenue	$ 767,170	$ 732,901	$ 2,427,044	$ 2,200,741
Cost of net revenues:
Total cost of net revenues	127,286	126,918	365,103	344,870
Gross margin	639,884	605,983	2,061,941	1,855,871
Operating expenses:
Research and development	130,628	126,420	405,563	390,712
Sales, marketing and services	298,659	274,874	916,279	847,958
General and administrative	81,591	80,042	252,498	238,751
Amortization of other intangible assets	701	4,937	2,097	11,671
Restructuring Charges	0	8,879	11,981	16,022
Total operating expenses	511,579	495,152	1,588,418	1,505,114
Income from operations	128,305	110,831	473,523	350,757
Interest income	491	2,649	2,685	16,193
Interest expense	(16,639)	(8,822)	(48,326)	(37,144)
Other income, net	3,841	3,456	7,850	3,735
Income before income taxes	115,998	108,114	435,732	333,541
Income tax expense (benefit)	17,771	(162,743)	43,377	(141,159)
Net income	$ 98,227	$ 270,857	$ 392,355	$ 474,700
Earnings per share:
Basic (in dollars per share)	$ 0.80	$ 2.08	$ 3.17	$ 3.62
Diluted (in dollars per share)	$ 0.78	$ 2.04	$ 3.10	$ 3.48
Weighted average shares outstanding:
Basic (in shares)	123,255	130,277	123,835	131,020
Diluted (in shares)	125,863	132,655	126,407	136,297
Subscription [Member]
Revenues:
Revenue	$ 262,604	$ 159,873	$ 774,290	$ 457,312
Product and License [Member]
Revenues:
Revenue	87,218	131,057	390,009	406,733
Cost of net revenues:
Cost of net revenues	16,238	27,411	57,554	75,033
Support and Services [Member]
Revenues:
Revenue	417,348	441,971	1,262,745	1,336,696
Subscription, Support and Service [Member]
Cost of net revenues:
Cost of net revenues	102,755	76,885	282,672	227,130
Product [Member]
Cost of net revenues:
Amortization and impairment of product related intangible assets	$ 8,293	$ 22,622	$ 24,877	$ 42,707