Condensed Consolidated Statements Of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues:
Product and licenses	$ 192,102	$ 206,041	$ 594,708	$ 627,581
Software as a service	45,810	34,673	126,053	98,552
License updates and maintenance	420,951	398,171	1,232,734	1,178,053
Professional services	32,062	29,851	93,334	97,310
Total net revenues	690,925	668,736	2,046,829	2,001,496
Cost of net revenues:
Cost of product and license revenues	27,277	28,059	89,723	93,077
Cost of services and maintenance revenues	61,096	55,337	184,922	168,874
Amortization of product related intangible assets	17,564	14,775	43,062	43,222
Total cost of net revenues	105,937	98,171	317,707	305,173
Gross margin	584,988	570,565	1,729,122	1,696,323
Operating expenses:
Research and development	107,113	101,741	316,478	304,624
Sales, marketing and services	249,499	244,495	764,564	724,343
General and administrative	79,378	79,617	237,033	236,775
Amortization of Other Intangible Assets	3,733	3,907	11,071	11,449
Restructuring	8,552	12,176	18,678	61,312
Total operating expenses	448,275	441,936	1,347,824	1,338,503
Income from operations	136,713	128,629	381,298	357,820
Interest income	7,873	4,193	19,045	12,108
Interest expense	(11,726)	(11,254)	(35,286)	(33,605)
Other income (expense), net	981	494	3,166	(781)
Income from continuing operations before income taxes	133,841	122,062	368,223	335,542
Income tax expense	7,121	10,325	62,349	44,262
Income from continuing operations	126,720	111,737	305,874	291,280
Income (loss) from discontinued operations, net of income taxes	0	20,164	(42,704)	44,982
Net income	$ 126,720	$ 131,901	$ 263,170	$ 336,262
Basic earnings (loss) per share:
Income from continuing operations, basic (in dollars per share)	$ 0.84	$ 0.72	$ 2.01	$ 1.88
Income (loss) from discontinued operations, basic (in dollars per share)	0.00	0.13	(0.28)	0.29
Basic earnings per share (in dollars per share)	0.84	0.85	1.73	2.17
Diluted earnings (loss) per share:
Income from continuing operations, diluted (in dollars per share)	0.82	0.71	1.96	1.86
Income (loss) from discontinued operations, diluted (in dollars per share)	0.00	0.13	(0.28)	0.29
Diluted earnings per share (in dollars per share)	$ 0.82	$ 0.84	$ 1.68	$ 2.15
Weighted average shares outstanding:
Basic (in shares)	151,156	155,525	151,896	154,847
Diluted (in shares)	154,627	157,532	156,384	156,697