Segment Information (Financial Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Operating Revenues	$ 500,204	$ 386,013	$ 953,747	$ 750,784
Depreciation and Amortization	43,291	37,272	82,935	73,250
Operating Income/(Loss)	75,515	60,707	132,825	109,972
Equity in Earnings/(Losses) of Affiliates, Net of Tax	78	4,667	(11)	8,434
Net Income/(Loss) From Continuing Operations	40,424	33,264	67,964	62,762
Capital Expenditures	26,954	17,562	45,785	40,203
Assets	4,018,639		4,018,639		$ 3,673,035
Operating Segments [Member] | Property Intelligence [Member]
Segment Reporting Information [Line Items]
Operating Revenues	276,681	161,105	518,121	314,498
Depreciation and Amortization	32,373	24,365	60,300	48,557
Operating Income/(Loss)	33,224	17,057	50,499	36,678
Equity in Earnings/(Losses) of Affiliates, Net of Tax	504	7,685	552	13,826
Net Income/(Loss) From Continuing Operations	33,111	24,570	49,796	50,237
Capital Expenditures	14,064	10,213	25,959	25,237
Assets	2,503,110		2,503,110		2,058,412
Operating Segments [Member] | Risk Management and Work Flow [Member]
Segment Reporting Information [Line Items]
Operating Revenues	226,240	227,611	441,258	441,622
Depreciation and Amortization	6,614	8,003	14,332	16,244
Operating Income/(Loss)	66,322	64,934	119,245	115,892
Equity in Earnings/(Losses) of Affiliates, Net of Tax	0	0	0	0
Net Income/(Loss) From Continuing Operations	66,322	64,930	119,243	115,867
Capital Expenditures	2,793	3,486	5,128	6,833
Assets	1,336,008		1,336,008		1,316,785
Corporate [Member]
Segment Reporting Information [Line Items]
Operating Revenues	7	9	3	32
Depreciation and Amortization	4,304	4,904	8,303	8,449
Operating Income/(Loss)	(24,031)	(21,284)	(36,919)	(42,598)
Equity in Earnings/(Losses) of Affiliates, Net of Tax	(426)	(3,018)	(563)	(5,392)
Net Income/(Loss) From Continuing Operations	(59,009)	(56,236)	(101,075)	(103,342)
Capital Expenditures	10,097	3,863	14,698	8,133
Assets	5,608,361		5,608,361		5,318,990
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	(2,724)	(2,712)	(5,635)	(5,368)
Depreciation and Amortization	0	0	0	0
Operating Income/(Loss)	0	0	0	0
Equity in Earnings/(Losses) of Affiliates, Net of Tax	0	0	0	0
Net Income/(Loss) From Continuing Operations	0	0	0	0
Capital Expenditures	0	$ 0	0	$ 0
Assets	$ (5,428,840)		$ (5,428,840)		$ (5,021,152)