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Acquisitions and Dispositions (Details Textual) - USD ($) $ in Thousands						3 Months Ended	12 Months Ended
	Mar. 19, 2020	Feb. 14, 2020	Nov. 15, 2019	Apr. 01, 2019	Mar. 08, 2019	Mar. 31, 2020	Dec. 31, 2018	Dec. 31, 2019
Business Acquisition [Line Items]
Deferred acquisition consideration						$ 72,736		$ 75,220
Redeemable noncontrolling interest, redemptions, value						1,615	$ 14,530
KWT Global [Member]
Business Acquisition [Line Items]
Remaining ownership interest acquired (percent)	22.50%
Aggregate purchase price	$ 2,118
Closing cash payment	729
Deferred acquisition consideration	1,389
Redeemable noncontrolling interest, redemptions, value						$ 1,615
Reduction in noncontrolling interests	$ 503
Laird - Partners [Member]
Business Acquisition [Line Items]
Remaining ownership interest acquired (percent)			35.00%
Aggregate purchase price			$ 2,389
Closing cash payment			1,588
Deferred acquisition consideration			801
Business acquisitions and step-up transactions, net of tax			(5,045)
Reduction in noncontrolling interests			$ 2,656
Hunter PR LLC [Member]
Business Acquisition [Line Items]
Remaining ownership interest acquired (percent)				35.00%
Aggregate purchase price				$ 10,234
Closing cash payment				3,890
Deferred acquisition consideration				6,344
Business acquisitions and step-up transactions, net of tax				(9,486)
Reduction in noncontrolling interests				$ 745
Sloane and Company LLC [Member]
Business Acquisition [Line Items]
Proceeds from Divestiture of Businesses		$ 26,000
Gain (loss) on disposition of business		$ 16,131
Kingsdale Partners LP [Member]
Business Acquisition [Line Items]
Proceeds from Divestiture of Businesses					$ 50,000
Gain (loss) on disposition of business					$ 3,000

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Business Combination, Acquisition of Less than 100 Percent, Redeemable Noncontrolling Interest, Fair Value

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