Condensed Consolidated Statements Of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues:
Revenue	$ 719,143	$ 697,192
Cost of net revenues:
Total cost of net revenues	107,473	108,286
Gross margin	611,670	588,906
Operating expenses:
Research and development	130,263	98,550
Sales, marketing and services	274,655	251,213
General and administrative	77,547	63,727
Amortization of other intangible assets	3,529	3,666
Restructuring	2,832	6,187
Total operating expenses	488,826	423,343
Income from operations	122,844	165,563
Interest income	9,674	8,731
Interest expense	(18,033)	(20,336)
Other income (expense), net	3,699	(3,012)
Income before income taxes	118,184	150,946
Income tax expense	7,836	6,687
Net income	$ 110,348	$ 144,259
Earnings per share:
Basic earnings per share (in dollars per share)	$ 0.84	$ 1.04
Diluted earnings per share (in dollars per share)	$ 0.78	$ 0.99
Weighted average shares outstanding:
Basic (in shares)	131,483	139,248
Diluted (in shares)	141,025	146,388
Subscription [Member]
Revenues:
Revenue	$ 141,606	$ 103,158
Product and License [Member]
Revenues:
Revenue	135,022	160,697
Cost of net revenues:
Cost of net revenues	25,744	33,872
Support and Services [Member]
Revenues:
Revenue	442,515	433,337
Subscription, Support and Service [Member]
Cost of net revenues:
Cost of net revenues	71,428	63,385
Product [Member]
Cost of net revenues:
Amortization of product related intangible assets	$ 10,301	$ 11,029