Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred income tax assets
Tax Receivable Agreement	$ 199,107	$ 197,598
Share-based compensation	17,140	15,572
Intangibles	2,563	2,467
Fixed assets and other	37,100	44,908
Tax credits and net operating loss carryforwards	60,597	86,420
Less: Valuation allowance on net operating loss carryforwards and tax credits	(60,385)	(60,594)
Total deferred income tax assets	256,122	286,371
Deferred income tax liabilities
Intangibles	63,052	71,700
Total deferred income tax liabilities	$ 63,052	$ 71,700