Income Taxes - Schedule of Reconciliation of U.S. Statutory Income Tax Rate to Company's Effective Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes
U.S. statutory tax rate	21.00%	21.00%	35.00%
Increase due to state and local taxes, net of federal benefit	3.10%	3.10%	2.60%
Non-creditable foreign taxes	1.10%	1.20%
Foreign derived intangible income deduction	(1.50%)	(1.30%)
Income attributable to non-controlling interests	(7.20%)	(7.30%)	(12.50%)
Uncertain Tax Positions	1.00%	0.80%	0.60%
Other	1.40%	(0.80%)	(0.80%)
Subtotal	18.90%	16.70%	24.90%
Impact of TRA adjustment on NCI		0.70%	4.50%
Effect of permanent difference - TRA adjustment		(2.20%)	(13.60%)
Tax Reform Rate Change			49.00%
Valuation allowance recognized on basis step-ups		9.50%
Effective tax rate	18.90%	24.70%	64.80%
Income tax expense (benefit)			$ 42,800
Benefit as a result of reduction in TRA Liability		$ 6,145	32,736
Net effect on net income			$ (10,100)
Valuation allowance against related deferred tax assets		6,300
Value of TRA liability		6,100
Income taxes (payable) receivable, net	$ (4,300)	$ 300