Condensed Consolidated Statements Of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Product and licenses	$ 211,009	$ 219,507	$ 402,606	$ 421,540
Software as a service	41,513	32,764	80,243	63,879
License updates and maintenance	409,028	386,864	811,783	779,882
Professional services	31,677	34,852	61,272	67,459
Total net revenues	693,227	673,987	1,355,904	1,332,760
Cost of net revenues:
Cost of product and license revenues	32,735	33,623	62,446	65,018
Cost of services and maintenance revenues	64,167	59,178	123,826	113,537
Amortization of product related intangible assets	12,410	14,390	25,498	28,447
Total cost of net revenues	109,312	107,191	211,770	207,002
Gross margin	583,915	566,796	1,144,134	1,125,758
Operating expenses:
Research and development	106,696	100,651	209,365	202,883
Sales, marketing and services	268,300	245,921	515,065	479,848
General and administrative	81,146	78,883	157,655	157,158
Amortization of other intangible assets	3,692	3,822	7,338	7,542
Restructuring	2,140	3,580	10,126	49,136
Total operating expenses	461,974	432,857	899,549	896,567
Income from operations	121,941	133,939	244,585	229,191
Interest income	5,560	4,164	11,172	7,915
Interest expense	(12,007)	(11,196)	(23,560)	(22,351)
Other (expense) income, net	(1,141)	(272)	2,185	(1,275)
Income from continuing operations before income taxes	114,353	126,635	234,382	213,480
Income tax expense	5,524	20,346	55,228	33,937
Income from continuing operations	108,829	106,289	179,154	179,543
Income (loss) from discontinued operations, net of income taxes	0	14,609	(42,704)	24,818
Net income	$ 108,829	$ 120,898	$ 136,450	$ 204,361
Basic earnings (loss) per share:
Income from continuing operations, basic (in dollars per share)	$ 0.72	$ 0.69	$ 1.18	$ 1.16
Income (loss) from discontinued operations, basic (in dollars per share)	0.00	0.09	(0.28)	0.16
Basic earnings per share (in dollars per share)	0.72	0.78	0.90	1.32
Diluted earnings (loss) per share:
Income from continuing operations, diluted (in dollars per share)	0.70	0.68	1.14	1.15
Income (loss) from discontinued operations, diluted (in dollars per share)	0.00	0.09	(0.27)	0.16
Diluted earnings per share (in dollars per share)	$ 0.70	$ 0.77	$ 0.87	$ 1.31
Weighted average shares outstanding:
Basic (in shares)	151,212	154,998	152,247	154,485
Diluted (in shares)	156,036	156,666	157,239	156,258