Stockholder's Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	May 24, 2022	Mar. 31, 2022	Feb. 28, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	May 15, 2020
Class of Stock [Line Items]
Preferred stock, authorized (in shares)	50,000,000	50,000,000
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001				$ 0.001
Preferred stock, issued (in shares)	0	0
Class A Stock
Class of Stock [Line Items]
Common stock, authorized (in shares)	50,000,000	50,000,000				50,000,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, outstanding (in shares)	11,270,944	11,270,944	11,863,559	12,156,174	12,322,073	12,447,036	12,592,646	12,586,043	12,381,778	12,636,523
Common stock, issued (in shares)	11,270,944	11,270,944				12,447,036
Class A Stock | New Program
Class of Stock [Line Items]
Repurchase of class A common stock (in shares)			550,000		518,000					530,000
Shares repurchased as a percent of shares outstanding (as a percent)			4.60%		4.20%					4.20%
Remaining amount authorized for repurchase (in shares)	29,278	29,278	621,893		530,407					628,625
Stock repurchased (in shares)	885,230	1,262,543
Total consideration for repurchase of stock	$ 30.2	$ 46.4
Stock repurchased (in dollars per share)	$ 34.13	$ 36.73
Class A Stock | Previous Program
Class of Stock [Line Items]
Remaining amount authorized for repurchase (in shares)			71,893		12,407					98,625
Class B Stock
Class of Stock [Line Items]
Common stock, authorized (in shares)	99,665	99,665				99,665
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, outstanding (in shares)	99,665	99,665				99,665
Common stock, issued (in shares)	99,665	99,665				99,665