Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues:
Product and licenses	$ 857,253	$ 882,898	$ 873,808
Software as a service	175,762	134,682	103,851
License updates and maintenance	1,659,936	1,587,271	1,521,007
Professional services	131,735	131,229	147,488
Total net revenues	2,824,686	2,736,080	2,646,154
Cost of net revenues:
Cost of product and license revenues	123,356	121,391	118,265
Cost of services and maintenance revenues	250,602	228,080	228,503
Amortization of product related intangible assets	50,183	54,290	71,001
Impairment of product related intangible assets	15,505	1,128	56,271
Total cost of net revenues	439,646	404,889	474,040
Gross margin	2,385,040	2,331,191	2,172,114
Operating expenses:
Research and development	415,801	395,373	480,957
Sales, marketing and services	1,006,112	976,339	1,005,802
General and administrative	302,565	316,838	286,424
Amortization of other intangible assets	14,652	15,076	30,341
Impairment of other intangible assets	2,538	0	67,137
Restructuring	72,375	67,401	98,661
Total operating expenses	1,814,043	1,771,027	1,969,322
Income from continuing operations	570,997	560,164	202,792
Interest income	27,808	16,686	11,675
Interest expense	(51,609)	(44,949)	(44,153)
Other income (expense), net	3,150	(4,131)	(5,730)
Income from continuing operations before income taxes	550,346	527,770	164,584
Income tax expense (benefit)	528,361	57,915	(50,549)
Income from continuing operations	21,985	469,855	215,133
(Loss) income from discontinued operations, net of income tax expense of $2,900, $22,737, and $43,065, respectively	(42,704)	66,257	104,228
Net (loss) income	$ (20,719)	$ 536,112	$ 319,361
Basic (loss) earnings per share:
Income from continuing operations (USD per share)	$ 0.15	$ 3.03	$ 1.35
(Loss) income from discontinued operations (USD per share)	(0.28)	0.43	0.66
Basic net earnings per share (USD per share)	(0.13)	3.46	2.01
Diluted (loss) earnings per share:
Income from continuing operations (USD per share)	0.14	2.99	1.34
(Loss) income from discontinued operations (USD per share)	(0.27)	0.42	0.65
Diluted net earnings per share (USD per share)	$ (0.13)	$ 3.41	$ 1.99
Weighted average shares outstanding:
Basic (in shares)	150,779	155,134	158,874
Diluted (in shares)	155,503	157,084	160,362