Income Taxes - Narrative - (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Operating Loss Carryforwards [Line Items]
Deferred Tax Asset Partnership Outside Basis	$ 10,700	$ 44,400	$ 37,400	$ 61,000
Liability under tax receivable agreement	326,315		$ 326,315		$ 278,865
Percent of tax benefits realized that the company must make payments to holders for			85.00%
Named Executive Officers and Members of the Board of Directors
Operating Loss Carryforwards [Line Items]
Liability under tax receivable agreement	$ 67,400		$ 67,400		$ 56,800