Income Taxes - Tax Receivable Agreement (Details) - USD ($) $ in Thousands	1 Months Ended						12 Months Ended			24 Months Ended
	Jan. 31, 2020	Dec. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Percentage of future payments to existing share holders, US federal income tax cash savings							85.00%
TRA liability benefit (expense)								$ 5,000	$ 58,000	$ (55,000)
Reduction related to certain audit and transfer pricing adjustments							$ 3,000
Payments for TRA							$ 101,482	$ 58,908	$ 99,241
Early termination payment		$ 1,000
IRS
Operating Loss Carryforwards [Line Items]
Payments for TRA			$ 30,000	$ 74,000	$ 60,000	$ 101,000
Subsequent event | IRS
Operating Loss Carryforwards [Line Items]
Payments for TRA	$ 72,000