Segment Information (Financial Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Operating Revenues	$ 523,896	$ 386,439	$ 1,477,644	$ 1,137,224
Depreciation and Amortization	44,498	36,440	127,433	109,689
Operating Income/(Loss)	84,824	65,920	217,649	175,893
Equity in Earnings/(Losses) of Affiliates, Net of Tax	607	3,497	595	11,931
Net Income/(Loss) From Continuing Operations	36,002	28,642	103,965	91,406
Capital Expenditures	16,583	17,512	62,368	57,715
Assets	4,010,894		4,010,894		$ 3,673,035
Operating Segments [Member] | Property Intelligence [Member]
Segment Reporting Information [Line Items]
Operating Revenues	280,620	156,944	798,741	471,442
Depreciation and Amortization	33,280	23,052	93,580	71,609
Operating Income/(Loss)	28,018	19,552	78,518	56,229
Equity in Earnings/(Losses) of Affiliates, Net of Tax	872	5,763	1,424	19,589
Net Income/(Loss) From Continuing Operations	28,325	25,213	78,122	75,450
Capital Expenditures	12,517	10,303	38,476	35,541
Assets	2,504,317		2,504,317		2,058,412
Operating Segments [Member] | Risk Management and Work Flow [Member]
Segment Reporting Information [Line Items]
Operating Revenues	245,764	232,050	687,023	673,672
Depreciation and Amortization	6,304	9,525	20,635	25,769
Operating Income/(Loss)	76,749	64,104	195,993	179,996
Equity in Earnings/(Losses) of Affiliates, Net of Tax	0	0	0	0
Net Income/(Loss) From Continuing Operations	76,749	64,100	195,991	179,967
Capital Expenditures	2,658	3,355	7,786	10,187
Assets	1,339,912		1,339,912		1,316,785
Corporate [Member]
Segment Reporting Information [Line Items]
Operating Revenues	2	0	5	37
Depreciation and Amortization	4,914	3,863	13,218	12,311
Operating Income/(Loss)	(19,943)	(17,736)	(56,862)	(60,332)
Equity in Earnings/(Losses) of Affiliates, Net of Tax	(265)	(2,266)	(829)	(7,658)
Net Income/(Loss) From Continuing Operations	(69,072)	(60,671)	(170,148)	(164,011)
Capital Expenditures	1,408	3,854	16,106	11,987
Assets	5,595,976		5,595,976		5,318,990
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	(2,490)	(2,555)	(8,125)	(7,927)
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	$ (5,429,311)		$ (5,429,311)		$ (5,021,152)