Share-Based Compensation (Weighted-Average Assumptions Used in Estimating Grant Date Fair Values of Stock Option Awards) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Key assumptions used in estimating the grant date fair values of stock option awards granted
Total stock options granted	100,000	165,000	220,000
Expected life of options	10 years
Stock Options
Key assumptions used in estimating the grant date fair values of stock option awards granted
Weighted-average grant date fair value (in dollars per share)	$ 15.21	$ 7.67	$ 7.59
Risk-free rate	1.40%	1.20%	2.10%
Expected life of options	6 years 6 months	6 years 3 months 18 days	6 years 1 month 6 days
Expected volatility	73.70%	60.70%	39.40%
Expected quarterly dividends	$ 0	$ 0	$ 0