Share-Based Compensation - Stock Options Activity (Details) - Stock options - shares	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Stock Options
Options outstanding at beginning of period (in shares)	824,300	1,090,300
Granted (in shares)	0	0
Exercised (in shares)	(33,750)	(114,000)
Forfeited (in shares)	0	0
Options outstanding at end of period (in shares)	790,550	976,300
Options exercisable at end of period (in shares)	785,550	938,800