Discontinued Operations (Financial Statement Information) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Income/(loss) from discontinued operations, net of tax									$ 2,315	$ (1,466)	$ (556)
Income/(loss) from discontinued operations, net of tax	$ (106)	$ (74)	$ 78	$ 2,417	$ (468)	$ (936)	$ (4)	$ (58)	2,315	(1,466)	(556)
Discontinued Operations, Disposed of by Sale [Member]
Statement of Financial Position [Abstract]
Deferred income tax asset and other current assets	383				662				383	662
Accounts payable and accrued expenses	1,806				3,123				1,806	3,123
Income Statement [Abstract]
Operating revenue									0	0	0
Income/(loss) from discontinued operations before income taxes									3,751	(2,385)	(900)
Provision/(benefit) for income taxes									1,436	(919)	(344)
Income/(loss) from discontinued operations, net of tax											(556)
Less: Net income attributable to noncontrolling interests											0
Income/(loss) from discontinued operations, net of tax									2,315	(1,466)	(556)
Discontinued Operations, Disposed of by Sale [Member] | Property Intelligence [Member]
Statement of Financial Position [Abstract]
Deferred income tax asset and other current assets	325				325				325	325
Accounts payable and accrued expenses	12				202				12	202
Income Statement [Abstract]
Operating revenue									0	0	0
Income/(loss) from discontinued operations before income taxes									205	(37)	(650)
Provision/(benefit) for income taxes									78	(14)	(204)
Income/(loss) from discontinued operations, net of tax											(446)
Less: Net income attributable to noncontrolling interests											0
Income/(loss) from discontinued operations, net of tax									127	(23)	(446)
Discontinued Operations, Disposed of by Sale [Member] | Risk Management and Work Flow [Member]
Statement of Financial Position [Abstract]
Deferred income tax asset and other current assets	(231)				(231)				(231)	(231)
Accounts payable and accrued expenses	154				167				154	167
Income Statement [Abstract]
Operating revenue									0	0	0
Income/(loss) from discontinued operations before income taxes									6	142	(20)
Provision/(benefit) for income taxes									2	50	(52)
Income/(loss) from discontinued operations, net of tax											32
Less: Net income attributable to noncontrolling interests
Income/(loss) from discontinued operations, net of tax									4	92	32
Discontinued Operations, Disposed of by Sale [Member] | Employer And Litigation Services [Member]
Statement of Financial Position [Abstract]
Deferred income tax asset and other current assets	21				0				21	0
Accounts payable and accrued expenses	8				624				8	624
Income Statement [Abstract]
Operating revenue									0	0	0
Income/(loss) from discontinued operations before income taxes									(614)	(1,600)	0
Provision/(benefit) for income taxes									(233)	(612)	0
Income/(loss) from discontinued operations, net of tax											0
Less: Net income attributable to noncontrolling interests											0
Income/(loss) from discontinued operations, net of tax									(381)	(988)	0
Discontinued Operations, Disposed of by Sale [Member] | Asset Management and Processing Solutions [Member]
Statement of Financial Position [Abstract]
Deferred income tax asset and other current assets	268				568				268	568
Accounts payable and accrued expenses	$ 1,632				$ 2,130				1,632	2,130
Income Statement [Abstract]
Operating revenue									0	0	0
Income/(loss) from discontinued operations before income taxes									4,154	(890)	(230)
Provision/(benefit) for income taxes									1,589	(343)	(88)
Income/(loss) from discontinued operations, net of tax											(142)
Less: Net income attributable to noncontrolling interests											0
Income/(loss) from discontinued operations, net of tax									$ 2,565	$ (547)	$ (142)