Stock-Based Compensation - Other Stock Option Information (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares
Options outstanding (in shares)	901	50,601	115,246
Expired (in shares)	0	0	0
Exercised (in shares)	(676)	(49,700)	(64,645)
Options outstanding (in shares)	225	901	50,601
Weighted Average Exercise Price
Options outstanding (in dollars per share)	$ 19.33	$ 18.28	$ 20.73
Expired (in dollars per share)	0	0	0
Exercised (in dollars per share)	19.67	18.26	22.65
Options outstanding (in dollars per share)	18.33	19.33	18.28
Weighted Average Grant Date Fair Value
Options outstanding (in dollars per share)	16.78	4.68	4.86
Expired (in dollars per share)	0	0	0
Exercised (in dollars per share)	18.06	4.46	5.00
Options outstanding (in dollars per share)	$ 12.93	$ 16.78	$ 4.68