Quarterly Financial Data (Unaudited) - Summary of Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Revenues:
Total revenues	$ 399,920	$ 354,901	$ 297,618	$ 205,855	$ 319,950	$ 245,525	$ 234,995	$ 209,310	$ 1,258,294		$ 1,009,780		$ 1,024,191
Operating expenses:
Cost of revenue	173,104	174,168	155,240	114,941	104,281	102,473	116,261	107,336	617,453	[1]	430,351	[1]	452,286	[1]
Research and development	34,601	36,543	39,235	36,194	32,969	36,008	37,862	36,791	146,573		143,630		136,921
Selling and marketing	30,875	30,417	32,962	29,430	24,576	28,252	33,160	31,893	123,684		117,881		107,885
General and administrative	27,174	27,286	49,319	31,517	20,399	29,537	28,837	28,649	135,296		107,422		153,032
Depreciation and amortization	31,753	31,169	26,744	21,866	21,311	20,896	21,033	21,345	111,532		84,585		89,427
Total operating expenses	297,507	299,583	303,500	233,948	203,536	217,166	237,153	226,014	1,134,538		883,869		939,551
Operating income	102,413	55,318	(5,882)	(28,093)	116,414	28,359	(2,158)	(16,704)	123,756		125,911		84,640
Other income (expense):
Interest expense	(18,109)	(18,987)	(15,323)	(11,614)	(9,875)	(12,573)	(9,717)	(9,365)	(64,033)		(41,530)		(39,013)
Interest income	2,949	2,988	2,997	3,033	2,893	2,763	2,742	2,744	11,967		11,142		564
Other, net	3,399	(2,369)	1,402	(1,912)	(688)	(1,304)	(1,677)	(55)	520		(3,724)		(2,619)
Total other income (expense)	(11,761)	(18,368)	(10,924)	(10,493)	(7,670)	(11,114)	(8,652)	(6,676)	(51,546)		(34,112)		(41,068)
Income before income taxes	90,652	36,950	(16,806)	(38,586)	108,744	17,245	(10,810)	(23,380)	72,210		91,799		43,572
Income tax expense (benefit)	35,166	5,136	(22,531)	(12,623)	21,054	2,012	3,764	(3,952)	5,148		22,878		38,437
Net income	$ 55,486	$ 31,814	$ 5,725	$ (25,963)	$ 87,690	$ 15,233	$ (14,574)	$ (19,428)	$ 67,062		$ 68,921		$ 5,135
Earnings (loss) per share
Basic (in dollars per share)	$ 0.48	$ 0.27	$ 0.05	$ (0.22)	$ 0.76	$ 0.13	$ (0.13)	$ (0.17)	$ 0.58		$ 0.59		$ 0.04
Diluted (in dollars per share)	$ 0.47	$ 0.27	$ 0.05	$ (0.22)	$ 0.74	$ 0.13	$ (0.13)	$ (0.17)	$ 0.57		$ 0.59		$ 0.04
Software as a service and platform as a service
Revenues:
Total revenues	$ 203,661	$ 192,952	$ 172,499	$ 108,557	$ 110,626	$ 104,519	$ 113,600	$ 104,280	$ 677,669		$ 433,025		$ 425,572
License
Revenues:
Total revenues	122,584	92,058	52,541	21,078	137,991	68,964	45,555	28,046	288,261		280,556		293,124
Maintenance
Revenues:
Total revenues	53,738	52,638	51,922	55,111	53,065	54,373	55,048	56,659	213,409		219,145		222,071
Services
Revenues:
Total revenues	$ 19,937	$ 17,253	$ 20,656	$ 21,109	$ 18,268	$ 17,669	$ 20,792	$ 20,325	$ 78,955		$ 77,054		$ 83,424

[1] The cost of revenue excludes charges for depreciation but includes amortization of purchased and developed software for resale.