Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jul. 29, 2022	Jun. 30, 2022	May 24, 2022	Feb. 28, 2022	Dec. 31, 2021	Jun. 30, 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, issued (in shares)	10,874,990		10,874,990						12,447,036
Common stock, outstanding (in shares)	10,874,990	12,515,734	10,874,990	12,515,734	11,251,930	11,270,944	11,863,559	12,322,073	12,447,036	12,592,646	12,381,778	12,636,523
Class A Stock | New Program
Class of Stock [Line Items]
Repurchase of class A common stock (in shares)					536,500		550,000	518,000				530,000
Shares repurchased as a percent of shares outstanding (as a percent)					4.80%		4.60%	4.20%				4.20%
Remaining amount authorized for repurchase (in shares)	152,726		152,726		540,778		621,893	530,407				628,625
Stock repurchased (in shares)	413,052	108,494	1,675,595	108,494
Total consideration for repurchase of stock	$ 14.0	$ 4.7	$ 60.4	$ 4.7
Stock repurchased (in dollars per share)	$ 33.86	$ 43.46	$ 36.02	$ 43.46
Class A Stock | Previous Program
Class of Stock [Line Items]
Remaining amount authorized for repurchase (in shares)					4,278		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, issued (in shares)	99,665		99,665						99,665
Common stock, outstanding (in shares)	99,665		99,665						99,665