Condensed Consolidated Statements of Income - Unaudited (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues:
Processing and related services	$ 131,184	$ 133,362	$ 265,818	$ 269,676
Software, maintenance and services	54,923	50,489	100,921	99,182
Total revenues	186,107	183,851	366,739	368,858
Cost of revenues (exclusive of depreciation, shown separately below):
Processing and related services	62,964	62,334	124,541	124,294
Software, maintenance and services	31,794	30,186	63,571	58,195
Total cost of revenues	94,758	92,520	188,112	182,489
Other operating expenses:
Research and development	27,548	27,794	56,093	55,716
Selling, general and administrative	37,388	33,799	72,185	65,424
Depreciation	4,770	5,874	9,770	11,711
Restructuring charges	(38)	119	863	821
Total operating expenses	164,426	160,106	327,023	316,161
Operating income	21,681	23,745	39,716	52,697
Other income (expense):
Interest expense	(3,180)	(4,106)	(6,109)	(8,258)
Amortization of original issue discount	(1,325)	(1,226)	(2,624)	(2,429)
Interest and investment income, net	188	152	343	372
Other, net	1,498	277	1,080	72
Total other	(2,819)	(4,903)	(7,310)	(10,243)
Income before income taxes	18,862	18,842	32,406	42,454
Income tax provision	(6,790)	(6,972)	(5,436)	(18,778)
Net income	$ 12,072	$ 11,870	$ 26,970	$ 23,676
Weighted-average shares outstanding - Basic:
Common stock	32,125	32,194	32,129	32,293
Participating restricted stock		1		34
Total	32,125	32,195	32,129	32,327
Weighted-average shares outstanding - Diluted:
Common stock	32,439	32,309	32,483	32,435
Participating restricted stock		1		34
Total	32,439	32,310	32,483	32,469
Earnings per common share:
Basic	$ 0.38	$ 0.37	$ 0.84	$ 0.73
Diluted	$ 0.37	$ 0.37	$ 0.83	$ 0.73
Cash dividends declared per common share	$ 0.15		$ 0.15