Income Taxes - Federal Tax purpose (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Oct. 06, 2016	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
U.S. Federal income tax rate (as a percent)		21.00%
Deferred income taxes due to transfer of assets		$ 16,300	$ 16,300
Income tax expense		4,132	$ 22,913
Decrease in income tax expense		$ (18,800)
Effective tax rate (as a percent)		41.30%	588.40%
Current portion of liabilities under tax receivable agreement		$ 6,563		$ 6,563
Tax Receivable Agreement liability adjustment			$ 8,477
Tax receivable agreement
Reduction in tax receivable agreement liability due to reduction of future expected tax amortization			7,200
Reduction in tax receivable agreement liability due to change in state income tax rates			1,100
Tax Receivable Agreement liability adjustment			$ 8,500
Tax receivable agreement | CWGS, LLC
Units issued in exchange		20,000	5,725
Tax receivable agreement | Continuing Equity Owners and Crestview partners II GP LP
Payment, as percent of tax benefits (as a percent)	85.00%
CWH | CWGS, LLC
Ownership interest		42.10%	42.00%	42.00%
Units held		37,539,786		37,488,989
Crestview Partners II GP LP | Tax receivable agreement
Liability under tax receivable agreement		$ 114,800
Current portion of liabilities under tax receivable agreement		$ 6,600