Earnings Per Share (Computation of Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net income	$ 17,883	$ 28,655	$ 34,483	$ 59,873
Denominator:
Weighted-average shares outstanding - basic (in shares)	18,813,000	18,729,000	18,797,000	18,721,000
Effect of dilutive shares (in shares)	179,000	117,000	199,000	89,000
Weighted-average shares outstanding - dilutive (in shares)	18,992,000	18,846,000	18,996,000	18,810,000
Basic earnings per share (in dollars per share)	$ 0.95	$ 1.53	$ 1.83	$ 3.20
Diluted earnings per share (in dollars per share)	$ 0.94	$ 1.52	$ 1.82	$ 3.18
Anti-dilutive shares excluded (in shares)	226	1,769