Fair Value of Financial Instruments (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Aug. 06, 2019	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of intangible assets		$ 0	$ 35,600	$ 0
Non-cash impairment charges	$ 1,500	0	1,511	0
Impairment losses	$ 100		12,312	100
Increase/(decrease) in contingent consideration value		$ (100)	200	$ 1,000
Fair value adjustment of minority owned equity investment			6,600
Client lists
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of intangible assets			32,300
License
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of intangible assets			$ 3,300
Myriad Development, Inc. & Insignificant Acquisition
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration						$ 6,200
Myriad Development, Inc. & Insignificant Acquisition | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration						$ 20,500
National Tax Search LLC | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration					$ 7,500