Earnings Per Share (Computation of Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net income	$ 14,838	$ 25,129	$ 49,321	$ 85,002
Denominator:
Weighted-average shares outstanding - basic (in shares)	18,818,000	18,740,000	18,804,000	18,727,000
Effect of dilutive shares (in shares)	181,000	134,000	193,000	104,000
Weighted-average shares outstanding - diluted (in shares)	18,999,000	18,874,000	18,997,000	18,831,000
Basic earnings per share (in dollars per share)	$ 0.79	$ 1.34	$ 2.62	$ 4.54
Diluted earnings per share (in dollars per share)	$ 0.78	$ 1.33	$ 2.60	$ 4.51
Anti-dilutive shares excluded (in shares)	0	1,994