Debt - Narrative (Details) - USD ($)	1 Months Ended	9 Months Ended
	Jul. 31, 2020	Sep. 30, 2020	Aug. 18, 2020	May 31, 2020	Dec. 31, 2019	Jun. 30, 2019
Debt Instrument [Line Items]
Outstanding under subordinated note		$ 100,000,000			$ 123,000,000
Class A Common Stock
Debt Instrument [Line Items]
Share repurchase program, amount authorized			$ 20,000,000.0
Series A preferred stock
Debt Instrument [Line Items]
Shares authorized to be repurchased (in shares)				1,000,000
Fourth amendment to senior credit facility | Share buyback loans
Debt Instrument [Line Items]
Share repurchase program, amount authorized		80,000,000.0
Fourth amendment to senior credit facility | Series A preferred stock | Share buyback loans
Debt Instrument [Line Items]
Share repurchase program, amount authorized		$ 80,000,000.0
Senior secured revolving credit facility | Common class A and common class B
Debt Instrument [Line Items]
Default share limit, minimum amount (in shares)		13,600,000
Senior credit facility
Debt Instrument [Line Items]
Outstanding under subordinated note		$ 100,000,000			123,000,000
Senior credit facility | Fourth amendment to senior credit facility | Class A Common Stock | Share buyback loans
Debt Instrument [Line Items]
Shares authorized to be repurchased (in shares)		8,000,000
Senior credit facility | Senior secured revolving credit facility
Debt Instrument [Line Items]
Maximum leverage ratio		250.00%
Maximum senior secured leverage ratio		185.00%
Debt default, material judgment (in excess of)		$ 5,000,000.0
Senior credit facility | Senior secured revolving credit facility | Minimum
Debt Instrument [Line Items]
Fixed charge coverage ratio		125.00%
Subordinated debt | Retailco
Debt Instrument [Line Items]
Subordinated debt						$ 25,000,000.0
Subordinated debt, advances, no less than		$ 1,000,000.0
Subordinated debt, interest rate on advances		5.00%
Minimum availability under the borrowing base		$ 5,000,000.0
Outstanding under subordinated note		$ 0			0
Revolving credit facility | Fourth amendment to senior credit facility | Eurodollar | Share buyback loans
Debt Instrument [Line Items]
Basis spread on variable rate		4.50%
Revolving credit facility | Fourth amendment to senior credit facility | Base rate | Share buyback loans
Debt Instrument [Line Items]
Basis spread on variable rate		3.50%
Revolving credit facility | Senior credit facility
Debt Instrument [Line Items]
Capitalized financing costs		$ 1,800,000			1,300,000
Capitalized financing costs, other current		1,000,000.0			900,000
Capitalized financing costs, other non-current		800,000			$ 400,000
Line of credit facility, maximum borrowing capacity		$ 187,500,000
Nonutilization fee, percent		0.50%
Revolving credit facility | Senior credit facility | Fourth amendment to senior credit facility | Eurodollar
Debt Instrument [Line Items]
Basis spread on variable rate	3.25%
Revolving credit facility | Senior credit facility | Fourth amendment to senior credit facility | Base rate
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%
Revolving credit facility | Senior credit facility | Fourth amendment to senior credit facility | Federal funds rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Revolving credit facility | Senior credit facility | Fourth amendment to senior credit facility | Reference eurodollar rate
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%