Stockholders' Equity - Common Stock (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) Vote $ / shares shares	Oct. 30, 2020 USD ($)	Dec. 31, 2019 shares
Stock Repurchase Program
Authorized amount for stock repurchase program | $		$ 100,000
Shares repurchased (in shares)	811,223
Payment for share repurchased | $	$ 21,522
Weighted average price (per share) | $ / shares	$ 26.53
Shares reissued from treasury stock	238,776
Remaining approve amount | $	$ 78,500
Common Class A
Common Stock
Common stock, authorized	250,000,000		250,000,000
Votes per share | Vote	1
Common Class B
Common Stock
Common stock, authorized	75,000,000		75,000,000
Votes per share | Vote	1
Common Class C
Common Stock
Common stock, authorized	1		1
Voting power (as a percent)	5.00%
M L Related Parties | Common Class B
Common Stock
Voting power (as a percent)	47.00%
M L Related Parties | Common Class A And Class B | CWGS, LLC | Minimum
Common Stock
Percentage of ownership	27.50%