Stock Based Compensation - Stock Option Award Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Number of Shares
Outstanding, beginning of year (in shares)	4,364,161	5,831,119	6,452,388
Grants in period, gross	15,000	432,000	445,227
Exercised (in shares)	(139,157)	(1,898,958)	(1,066,496)
Forfeited (in shares)	0	0	0
Cancelled (in shares)	0	0	0
Outstanding, end of year (in shares)	4,240,004	4,364,161	5,831,119
Weighted- Average Exercise Price
Outstanding, beginning of year, weighted average exercise price (in dollars per share)	$ 23.37	$ 22.22	$ 21.76
Granted, Weighted-Average Exercise Price ( in dollars per share)	53.32	23.90	32.92
Exercised, Weighted-Average Exercise Price ( in dollars per share)	19.87	19.96	23.75
Outstanding, end of year, weighted average exercise price (in dollars per share)	$ 23.64	$ 23.37	$ 22.22