Equity - Additional Information (Details) - USD ($)			3 Months Ended	9 Months Ended
	Nov. 04, 2020	Nov. 02, 2020	Sep. 30, 2020	Sep. 30, 2020	May 31, 2020	Aug. 31, 2019	Dec. 31, 2018
Number of shares acquired				2,911,402
Average cost of acquired shares (in dollars per share)				$ 14.59
Cost of acquired shares				$ 42,500,000
Remaining authorized amount for share repurchase program			$ 2,500,000	$ 2,500,000
Stock repurchase program expiration description				The Additional 2020 Share Repurchase Program expires when $15 million shares of Class A common stock are repurchased or on December 31, 2022.
Dividends paid			$ 4,100,000	$ 10,800,000
Total dividends				11,500,000
Special dividends paid				$ 700,000
Class A
Authorized amount for share repurchase program					$ 15,000,000.0	$ 15,000,000.0	$ 15,000,000.0
Class A | Subsequent Event
Authorized amount for share repurchase program	$ 15,000,000	$ 15,000,000.0
Share repurchase program expiration date	Dec. 31, 2022	Dec. 31, 2022