Segment Information (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Number of reportable segments			2
Operating Revenue	$ 367,454,000	$ 356,581,000	$ 1,059,528,000	$ 1,075,879,000
Depreciation and amortization	35,765,000	29,436,000	100,636,000	96,697,000
Operating Income/(Loss)	77,755,000	61,361,000	133,600,000	161,408,000
Equity in Earnings of Affiliates, Net of Tax	4,032,000	5,716,000	10,289,000	23,848,000
Net Income From Continuing Operations	50,123,000	43,427,000	74,180,000	109,661,000
Capital Expenditures	19,500,000	27,123,000	62,329,000	80,462,000
Assets	3,569,747,000		3,569,747,000		2,964,205,000
Data and analytics [Member]
Segment Reporting Information [Line Items]
Segment reporting intercompany revenue	1,100,000	1,500,000	3,200,000	7,400,000
Segment reporting intercompany expense	1,400,000	1,200,000	4,400,000	1,200,000
Operating Revenue	173,554,000	140,804,000	483,182,000	430,190,000
Depreciation and amortization	26,250,000	18,659,000	72,155,000	55,137,000
Operating Income/(Loss)	32,387,000	29,331,000	76,343,000	82,256,000
Equity in Earnings of Affiliates, Net of Tax	230,000	456,000	15,000	1,639,000
Net Income From Continuing Operations	33,251,000	36,592,000	76,990,000	90,990,000
Capital Expenditures	14,367,000	13,996,000	42,014,000	40,348,000
Assets	1,909,391,000		1,909,391,000		1,306,023,000
Mortgage origination services [Member]
Segment Reporting Information [Line Items]
Segment reporting intercompany revenue	1,300,000	1,000,000	4,400,000	2,600,000
Segment reporting intercompany expense	1,100,000	1,700,000	3,200,000	7,400,000
Operating Revenue	196,282,000	218,170,000	583,921,000	655,565,000
Depreciation and amortization	6,571,000	7,985,000	19,665,000	23,115,000
Operating Income/(Loss)	44,608,000	49,411,000	102,588,000	154,795,000
Equity in Earnings of Affiliates, Net of Tax	6,312,000	8,786,000	16,700,000	36,648,000
Net Income From Continuing Operations	50,846,000	59,311,000	125,019,000	192,337,000
Capital Expenditures	1,855,000	6,076,000	6,687,000	14,502,000
Assets	1,271,995,000		1,271,995,000		1,257,195,000
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Operating Revenue	94,000	148,000	20,000	493,000
Depreciation and amortization	2,944,000	2,792,000	8,816,000	18,445,000
Operating Income/(Loss)	760,000	(17,381,000)	(45,331,000)	(75,643,000)
Equity in Earnings of Affiliates, Net of Tax	(2,510,000)	(3,526,000)	(6,426,000)	(14,439,000)
Net Income From Continuing Operations	(33,974,000)	(52,476,000)	(127,829,000)	(173,666,000)
Capital Expenditures	3,278,000	7,051,000	13,628,000	25,612,000
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenue	(2,476,000)	(2,541,000)	(7,595,000)	(10,369,000)
Depreciation and amortization	0	0	0	0
Operating Income/(Loss)	0	0	0	0
Equity in Earnings of Affiliates, Net of Tax	0	0	0	0
Net Income From Continuing Operations	0	0	0	0
Capital Expenditures	0	0	0	0
Assets	(4,752,032,000)		(4,752,032,000)		(4,098,281,000)
Corporate Level [Member]
Segment Reporting Information [Line Items]
Assets	$ 5,140,393,000		$ 5,140,393,000		$ 4,499,268,000