Income Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Income Taxes
Income Tax Expense (Benefit)	$ 1,819,000	$ 1,998,000	$ 2,926,000	$ 4,417,000
Uncertain tax positions	$ 0		$ 0		$ 0
Tax Receivable Agreement, payout percentage			85.00%
Increase in liability due to additional exchanges			$ 11,200,000
Increase in deferred tax asset			15,900,000
Liability related to TRA			$ 22,000,000.0		$ 10,800,000