CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues:
Total revenues	$ 875,059	$ 789,582	$ 760,958
Cost of revenues (exclusive of depreciation, shown separately below):
Total cost of revenues	449,820	394,811	375,147
Other operating expenses:
Research and development	124,034	113,215	98,683
Selling, general and administrative	169,308	153,695	140,467
Depreciation	18,304	13,380	13,616
Restructuring and reorganization charges	8,661	8,796	416
Total operating expenses	770,127	683,897	628,329
Operating income	104,932	105,685	132,629
Other income (expense):
Interest expense	(17,667)	(16,794)	(16,262)
Amortization of original issue discount	(2,664)	(2,790)	(4,866)
Interest and investment income, net	2,646	3,246	2,457
Loss on extinguishment of debt	(810)		(8,651)
Other, net	550	(1,637)	(5,308)
Total other	(17,945)	(17,975)	(32,630)
Income before income taxes	86,987	87,710	99,999
Income tax provision	(20,857)	(26,346)	(37,117)
Net income	$ 66,130	$ 61,364	$ 62,882
Weighted-average shares outstanding:
Basic	32,488	32,415	30,968
Diluted	32,855	32,865	33,014
Earnings per common share:
Basic	$ 2.04	$ 1.89	$ 2.03
Diluted	$ 2.01	$ 1.87	$ 1.90
Cloud and Related Solutions
Revenues:
Total revenues	$ 766,377	$ 651,010	$ 606,936
Cost of revenues (exclusive of depreciation, shown separately below):
Total cost of revenues	392,801	315,006	282,952
Software and Services
Revenues:
Total revenues	58,101	62,892	79,400
Cost of revenues (exclusive of depreciation, shown separately below):
Total cost of revenues	34,870	39,018	49,202
Maintenance
Revenues:
Total revenues	50,581	75,680	74,622
Cost of revenues (exclusive of depreciation, shown separately below):
Total cost of revenues	$ 22,149	$ 40,787	$ 42,993