Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018		Dec. 31, 2017
Revenues:
Revenues	$ 3,010,564	$ 2,973,903	[1],[2]	$ 2,824,686	[1],[2]
Cost of net revenues:
Amortization and impairment of intangible assets	67,230	62,913		82,878
Total cost of net revenues	464,047	433,803		439,646
Gross margin	2,546,517	2,540,100		2,385,040
Operating expenses:
Research and development	518,877	439,984		415,801
Sales, marketing and services	1,132,956	1,074,234		1,006,112
General and administrative	320,429	315,343		302,565
Amortization and impairment of other intangible assets	15,890	15,854		17,190
Restructuring	22,247	16,725		72,375
Total operating expenses	2,010,399	1,862,140		1,814,043
Income from continuing operations	536,118	677,960		570,997
Interest income	18,280	40,030		27,808
Interest expense	(45,974)	(80,162)		(51,609)
Other income (expense), net	1,076	(8,373)		3,150
Income from continuing operations before income taxes	509,500	629,455		550,346
Income tax (benefit) expense	(172,313)	53,788		528,361
Income from continuing operations	681,813	575,667		21,985
Loss from discontinued operations, net of income tax expense of $2,900 in 2017	0	0		(42,704)
Net income (loss)	$ 681,813	$ 575,667		$ (20,719)
Basic earnings (loss) per share:
Income from continuing operations (USD per share)	$ 5.21	$ 4.23		$ 0.15
(Loss) income from discontinued operations (USD per share)	0	0		(0.28)
Basic net earnings (loss) per share (USD per share)	5.21	4.23		(0.13)
Diluted earnings (loss) per share:
Income from continuing operations (USD per share)	5.03	3.94		0.14
(Loss) income from discontinued operations (USD per share)	0	0		(0.27)
Diluted net earnings (loss) per share (USD per share)	$ 5.03	$ 3.94		$ (0.13)
Weighted average shares outstanding:
Basic (in shares)	130,853	136,030		150,779
Diluted (in shares)	135,495	145,934		155,503
Subscription
Revenues:
Revenues	$ 650,810	$ 455,276		$ 314,735	[3]
Product and license
Revenues:
Revenues	583,474	734,495		766,777
Cost of net revenues:
Cost of services and maintenance revenues	102,452	120,249		123,356
Support and services
Revenues:
Revenues	1,776,280	1,784,132		1,743,174
Cost of subscription, support and services
Cost of net revenues:
Cost of services and maintenance revenues	310,255	266,495		250,602
Product related intangible assets
Cost of net revenues:
Amortization and impairment of intangible assets	$ 51,340	$ 47,059		$ 65,688

[1] As noted above, prior period amounts have not been adjusted under the modified retrospective method of adoption of the revenue recognition standard.

[2] Prior period amounts have not been adjusted under the modified retrospective method of adoption of the revenue recognition standard.

[3] As noted above, prior period amounts have not been adjusted under the modified retrospective method of adoption of the revenue recognition standar