Tax Receivable Agreement (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
	Jan. 31, 2019	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Income Tax Contingency [Line Items]
Tax receivable agreement, percentage of income taxes			90.00%
Liability for tax receivable agreement			$ 117,900		$ 134,600
Reduction in tax receivable agreement liability	$ 16,700		$ 16,667	$ 0
Forecast
Income Tax Contingency [Line Items]
Reduction in tax receivable agreement liability		$ 27,700