Fair Value (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Aug. 06, 2019	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment loss	$ 0	$ 0	$ 1,228	$ 47,834
Impairment of intangible assets	0	0	0	35,600
Fair value adjustment of minority owned equity investment	0		0	(6,600)
Decrease/(Increase) in contingent consideration value	$ (1,200)	0	(3,800)	(200)
Client lists
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of intangible assets				32,300
Licenses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of intangible assets				3,300
UWS | Property and Equipment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment loss		$ 0	$ 1,200	$ 12,300
Myriad Development, Inc. & Insignificant Acquisition
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration						$ 4,400
Myriad Development, Inc. & Insignificant Acquisition | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration						$ 17,500
National Tax Search LLC | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration					$ 7,500