CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue
Revenue	$ 911,383	$ 891,581	$ 888,467
Cost of revenue
Total cost of revenue	310,022	301,765	279,673
Gross profit	601,361	589,816	608,794
Operating expenses
Selling and marketing	474,459	373,495	300,578
Research and development	205,210	181,710	162,886
General and administrative	56,570	51,643	52,153
Total operating expenses	736,239	606,848	515,617
(Loss) income from operations	(134,878)	(17,032)	93,177
Foreign currency transaction (loss) gain	(2,335)	2,421	(6,413)
Interest income, net	1,808	2,705	862
Other income (loss), net	559	363	(1,391)
(Loss) income before (benefit from) income taxes	(134,846)	(11,543)	86,235
(Benefit from) income taxes	(44,413)	(22,160)	(12,313)
Net (loss) income	$ (90,433)	$ 10,617	$ 98,548
(Loss) earnings per share
Basic (dollars per share)	$ (1.14)	$ 0.14	$ 1.27
Diluted (dollars per share)	$ (1.14)	$ 0.13	$ 1.19
Weighted-average number of common shares outstanding
Basic (shares)	79,055	78,564	77,431
Diluted (shares)	79,055	83,064	82,832
Software license
Revenue
Revenue	$ 279,448	$ 288,119	$ 339,294
Cost of revenue
Total cost of revenue	3,656	5,169	5,085
Maintenance
Revenue
Revenue	280,580	263,875	242,320
Cost of revenue
Total cost of revenue	25,656	24,565	27,905
Services
Revenue
Revenue	351,355	339,587	306,853
Cost of revenue
Total cost of revenue	$ 280,710	$ 272,031	$ 246,683