Segment Information (Details) (USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010	Dec. 29, 2010
Segment Reporting Information [Line Items]
Operating Revenues	$ 348,446,000	$ 330,146,000	$ 993,149,000	$ 964,910,000
Depreciation and Amortization	34,844,000	23,495,000	84,160,000	72,198,000
Income (Loss) from Continuing Operations	(2,892,000)	59,436,000	59,817,000	82,729,000
Capital Expenditures	10,884,000	14,920,000	33,558,000	45,734,000
Assets	3,045,993,000		3,045,993,000		2,974,105,000
Number of Reportable Segments	2		2			3
Data and Analytics [Member]
Segment Reporting Information [Line Items]
Segment Reporting Intercompany Revenue	3,300,000	2,900,000	11,200,000	11,900,000
Segment Reporting Intercompany Expense	5,100,000	4,500,000	17,700,000	13,800,000
Operating Revenues	184,509,000	161,185,000	514,216,000	464,374,000
Depreciation and Amortization	23,495,000	12,913,000	52,337,000	38,773,000
Income (Loss) from Continuing Operations	30,017,000	38,951,000	117,655,000	99,597,000
Capital Expenditures	4,288,000	2,827,000	13,295,000	9,207,000
Assets	1,156,085,000		1,156,085,000		1,169,766,000
Number Of Components	2		2
Business and Information Services [Member]
Segment Reporting Information [Line Items]
Segment Reporting Intercompany Revenue	2,300,000	400,000	3,300,000	2,900,000
Segment Reporting Intercompany Expense	8,100,000	9,800,000	30,000,000	27,100,000
Operating Revenues	169,587,000	174,955,000	493,542,000	511,371,000
Depreciation and Amortization	6,891,000	4,902,000	17,748,000	14,579,000
Income (Loss) from Continuing Operations	36,915,000	52,738,000	102,434,000	138,494,000
Capital Expenditures	4,463,000	2,736,000	10,827,000	7,255,000
Assets	1,391,144,000		1,391,144,000		1,027,062,000
Number Of Components	2		2
Corporate Elimination [Member]
Segment Reporting Information [Line Items]
Operating Revenues	(5,650,000)	(5,994,000)	(14,609,000)	(10,835,000)
Depreciation and Amortization	4,458,000	5,680,000	14,075,000	18,846,000
Income (Loss) from Continuing Operations	(69,824,000)	(32,253,000)	(160,272,000)	(155,362,000)
Capital Expenditures	2,133,000	9,357,000	9,436,000	29,272,000
Assets	$ 498,764,000		$ 498,764,000		$ 777,277,000

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Number of Reportable Segments

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Total expenditures for additions to long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment; if the amount: (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets.

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Amount of net assets (total assets less total liabilities) attributed to the reportable segment.

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