CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues
Revenues		$ 316,914	$ 315,883	$ 903,769	$ 907,278
Operating expenses
Cost of revenue	[1]	158,712	158,579	476,811	471,762
Research and development		35,248	33,573	104,791	108,175
Selling and marketing		33,413	22,154	90,211	76,692
General and administrative		29,717	37,000	89,429	102,684
Depreciation and amortization		31,845	33,395	95,434	98,928
Total operating expenses		288,935	284,701	856,676	858,241
Operating income		27,979	31,182	47,093	49,037
Other income (expense)
Interest expense		(11,208)	(12,925)	(33,943)	(44,238)
Interest income		2,834	2,927	8,553	8,781
Other, net		(1,088)	1,356	(1,036)	(6,361)
Total other income (expense)		(9,462)	(8,642)	(26,426)	(41,818)
Income before income taxes		18,517	22,540	20,667	7,219
Income tax expense		4,753	6,674	2,347	1,705
Net income		$ 13,764	$ 15,866	$ 18,320	$ 5,514
Income per common share
Basic (in dollars per share)		$ 0.12	$ 0.14	$ 0.16	$ 0.05
Diluted (in dollars per share)		$ 0.12	$ 0.13	$ 0.15	$ 0.05
Weighted average common shares outstanding
Basic (in shares)		117,512	116,558	117,574	116,217
Diluted (in shares)		118,540	117,804	118,817	117,644
Software as a service and platform as a service
Revenues
Revenues		$ 191,456	$ 190,369	$ 583,530	$ 563,892
License
Revenues
Revenues		54,454	56,773	110,383	135,038
Maintenance
Revenues
Revenues		53,519	53,049	159,037	159,078
Services
Revenues
Revenues		$ 17,485	$ 15,692	$ 50,819	$ 49,270

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