Segment Information (Financial Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Operating Revenues	$ 473,978	$ 500,204	$ 913,829	$ 953,747
Depreciation and Amortization	42,871	43,291	86,343	82,935
Operating Income/(Loss)	78,393	76,398	110,958	134,621
Equity in earnings/(losses) of affiliates, net of tax	(280)	78	(1,004)	(11)
Net Income/(Loss) From Continuing Operations	41,182	40,424	53,891	67,964
Capital Expenditures	20,327	26,954	37,439	45,785
Assets	3,976,298		3,976,298		$ 3,906,872
Operating Segments [Member] | Property Intelligence [Member]
Segment Reporting Information [Line Items]
Operating Revenues	251,124	276,681	478,543	518,121
Depreciation and Amortization	31,642	32,373	64,297	60,300
Operating Income/(Loss)	34,532	34,027	45,248	52,107
Equity in earnings/(losses) of affiliates, net of tax	(340)	504	(1,426)	552
Net Income/(Loss) From Continuing Operations	27,786	33,111	36,642	49,796
Capital Expenditures	12,524	14,064	23,695	25,959
Assets	2,495,243		2,495,243		2,429,167
Operating Segments [Member] | Risk Management and Work Flow [Member]
Segment Reporting Information [Line Items]
Operating Revenues	224,773	226,240	438,878	441,258
Depreciation and Amortization	6,095	6,614	12,103	14,332
Operating Income/(Loss)	64,163	66,332	106,272	119,263
Equity in earnings/(losses) of affiliates, net of tax	0	0	0	0
Net Income/(Loss) From Continuing Operations	64,154	66,322	106,253	119,243
Capital Expenditures	4,701	2,793	7,742	5,128
Assets	1,314,728		1,314,728		1,328,008
Corporate [Member]
Segment Reporting Information [Line Items]
Operating Revenues	0	7	(2)	3
Depreciation and Amortization	5,134	4,304	9,943	8,303
Operating Income/(Loss)	(20,302)	(23,961)	(40,562)	(36,749)
Equity in earnings/(losses) of affiliates, net of tax	60	(426)	422	(563)
Net Income/(Loss) From Continuing Operations	(50,758)	(59,009)	(89,004)	(101,075)
Capital Expenditures	3,102	10,097	6,002	14,698
Assets	5,592,302		5,592,302		5,575,846
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	(1,919)	(2,724)	(3,590)	(5,635)
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	$ (5,425,975)		$ (5,425,975)		$ (5,426,149)