CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues:
Cloud and related solutions	$ 606,936	$ 577,410	$ 562,109
Software and services	79,400	93,678	102,585
Maintenance	74,622	81,432	86,592
Total revenues	760,958	752,520	751,286
Cost of revenues (exclusive of depreciation, shown separately below):
Cloud and related solutions	282,952	270,715	277,084
Software and services	49,202	68,597	79,640
Maintenance	42,993	40,429	32,619
Total cost of revenues	375,147	379,741	389,343
Other operating expenses:
Research and development	98,683	101,950	104,712
Selling, general and administrative	140,467	139,839	153,488
Depreciation	13,616	14,776	14,084
Restructuring and reorganization charges	416	3,074	13,969
Total operating expenses	628,329	639,380	675,596
Operating income	132,629	113,140	75,690
Other income (expense):
Interest expense	(16,262)	(10,967)	(10,453)
Amortization of original issue discount	(4,866)	(6,246)	(5,781)
Interest and investment income, net	2,457	1,038	798
Loss on repurchase of convertible notes	(8,651)
Other, net	(5,308)	(624)	1,268
Total other	(32,630)	(16,799)	(14,168)
Income before income taxes	99,999	96,341	61,522
Income tax provision	(37,117)	(33,774)	(25,811)
Net income	$ 62,882	$ 62,567	$ 35,711
Weighted-average shares outstanding:
Basic	30,968	31,051	32,449
Diluted	33,014	33,438	33,736
Earnings per common share:
Basic	$ 2.03	$ 2.01	$ 1.10
Diluted	1.90	1.87	1.06
Cash dividends declared per common share	$ 0.74	$ 0.70	$ 0.62