CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Revenues:
Total revenues		$ 486,327		$ 497,638		$ 503,843
Cost of revenues:
Total cost of revenues		99,974		99,499		96,649
Gross profit		386,353		398,139		407,194
Operating expenses:
Sales and marketing		191,235		205,525		175,045
Research and development		109,423		102,499		78,766
General and administrative		86,697		86,134		80,161
Total operating expenses		387,355		394,158		333,972
(Loss) income from operations		(1,002)		3,981		73,222
Interest income, net		10,909		11,855		5,205
Other income (expense), net		28,356		4,646		(6,953)
Income before income taxes		38,263		20,482		71,474
Provision for (benefit from) income taxes		3,908		(2,019)		53,279
Net income		$ 34,355		$ 22,501		$ 18,195
Basic earnings per share	[1]	$ 3.35	[2]	$ 1.98	[2]	$ 1.59
Weighted average shares outstanding used in computing basic earnings per share		10,256		11,375		11,444
Diluted earnings per share	[1]	$ 3.33	[2]	$ 1.97	[2]	$ 1.58
Weighted average shares outstanding used in computing diluted earnings per share		10,328		11,412		11,547
Product licenses
Revenues:
Total revenues		$ 87,471		$ 88,057		$ 93,259
Cost of revenues:
Total cost of revenues		2,131		4,864		7,176
Subscription services
Revenues:
Total revenues		29,394		29,570		32,368
Cost of revenues:
Total cost of revenues		15,161		13,620		13,435
Total product licenses and subscription services
Revenues:
Total revenues		116,865		117,627		125,627
Cost of revenues:
Total cost of revenues		17,292		18,484		20,611
Product support
Revenues:
Total revenues		292,035		296,216		289,184
Cost of revenues:
Total cost of revenues		28,317		20,242		17,481
Other services
Revenues:
Total revenues		77,427		83,795		89,032
Cost of revenues:
Total cost of revenues		$ 54,365		$ 60,773		$ 58,557

[1] Basic and fully diluted earnings per share for class A and class B common stock are the same.

[2] The sum of the basic and diluted earnings (loss) per share for the four quarters may differ from annual earnings per share as the weighted average shares outstanding are computed independently for each of the quarters presented.