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Equity - Dividends and Repurchase of Common Stock (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Jan. 22, 2019	Sep. 10, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, dividends, per share, declared (in dollars per share)		$ 0.05	$ 0.05	$ 0.15
Shares of Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount						$ 100,000,000.0	$ 100,000,000.0
Shares of Class A Common Stock \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, dividends, per share, declared (in dollars per share)			$ 0.05
Dividends, common stock, cash	$ 4,100,000
Treasury stock, shares, retired (in shares)			0	1,303,003
Treasury stock, retired, amount				$ 18,400,000
Remaining authorized repurchase amount	$ 98,700,000		$ 98,700,000		$ 98,700,000
Treasury stock acquired, average cost per share (in dollars per share)				$ 14.66
Liberty LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, dividends, per share, declared (in dollars per share)	$ 0.05
Liberty LLC \| LLC Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends, common stock, cash	$ 5,600,000
Treasury stock, shares, retired (in shares)				1,303,003
Treasury stock, retired, amount				$ 18,400,000
Restricted Stock and Restricted Stock Units (RSUs) \| Shares of Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends payable	$ 200,000		$ 200,000
Riverstone \| Affiliated Entity \| Shares of Class A Common Stock \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury stock, shares, retired (in shares)				117,647