Segment Information (Tables) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net	$ 386,439,000	$ 367,454,000	$ 1,137,224,000	$ 1,059,528,000
Depreciation and amortization	36,440,000	35,765,000	109,631,000	100,636,000
Operating Income (Loss)	65,920,000	77,755,000	175,893,000	133,600,000
Income (Loss) from Equity Method Investments	3,497,000	4,032,000	11,931,000	10,289,000
Net income from continuing operations	28,642,000	50,123,000	91,406,000	74,180,000
Expenditures for Additions to Long-lived Assets	17,512,000	19,500,000	57,715,000	62,329,000
Segment Reporting Information, Assets (Excluding Discontinued Operations Assets)	3,601,543,000		3,601,543,000		$ 3,512,095,000
Data and Analytics [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net	170,509,000	173,554,000	510,644,000	483,182,000
Depreciation and amortization	24,552,000	26,250,000	75,978,000	72,155,000
Operating Income (Loss)	27,196,000	32,387,000	78,479,000	76,343,000
Income (Loss) from Equity Method Investments	(96,000)	230,000	(1,000,000)	15,000
Net income from continuing operations	27,075,000	33,251,000	77,320,000	76,990,000
Expenditures for Additions to Long-lived Assets	12,121,000	14,367,000	41,492,000	42,014,000
Segment Reporting Information, Assets (Excluding Discontinued Operations Assets)	1,986,847,000		1,986,847,000		1,886,478,000
Technology and Processing Solutions [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net	218,349,000	196,282,000	633,962,000	583,921,000
Depreciation and amortization	8,025,000	6,571,000	21,342,000	19,665,000
Operating Income (Loss)	56,459,000	44,608,000	157,746,000	102,588,000
Income (Loss) from Equity Method Investments	5,859,000	6,312,000	20,589,000	16,700,000
Net income from continuing operations	62,238,000	50,846,000	178,096,000	125,019,000
Expenditures for Additions to Long-lived Assets	1,537,000	1,855,000	4,236,000	6,687,000
Segment Reporting Information, Assets (Excluding Discontinued Operations Assets)	1,293,911,000		1,293,911,000		1,297,903,000
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net	0	94,000	37,000	20,000
Depreciation and amortization	3,863,000	2,944,000	12,311,000	8,816,000
Operating Income (Loss)	(17,735,000)	760,000	(60,332,000)	(45,331,000)
Income (Loss) from Equity Method Investments	(2,266,000)	(2,510,000)	(7,658,000)	(6,426,000)
Net income from continuing operations	(60,671,000)	(33,974,000)	(164,010,000)	(127,829,000)
Expenditures for Additions to Long-lived Assets	3,854,000	3,278,000	11,987,000	13,628,000
Segment Reporting Information, Assets (Excluding Discontinued Operations Assets)	5,211,079,000		5,211,079,000		5,102,328,000
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net	(2,419,000)	(2,476,000)	(7,419,000)	(7,595,000)
Depreciation and amortization	0	0	0	0
Operating Income (Loss)	0	0	0	0
Income (Loss) from Equity Method Investments	0	0	0	0
Net income from continuing operations	0	0	0	0
Expenditures for Additions to Long-lived Assets	0	$ 0	0	$ 0
Segment Reporting Information, Assets (Excluding Discontinued Operations Assets)	$ (4,890,294,000)		$ (4,890,294,000)		$ (4,774,614,000)