Earnings Per Share (Computation of Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator:
Net income	$ 19,035	$ 14,838	$ 33,394	$ 49,321
Denominator:
Weighted-average shares outstanding - basic (in shares)	18,627,000	18,818,000	18,619,000	18,804,000
Effect of dilutive shares (in shares)	58,000	181,000	49,000	193,000
Weighted-average shares outstanding - diluted (in shares)	18,685,000	18,999,000	18,668,000	18,997,000
Basic earnings per share (in dollars per share)	$ 1.02	$ 0.79	$ 1.79	$ 2.62
Diluted earnings per share (in dollars per share)	$ 1.02	$ 0.78	$ 1.79	$ 2.60
Anti-dilutive shares excluded (in shares)	8,000	0