Earnings Per Share (Computation of Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Numerator:
Net income	$ 16,600	$ 31,218
Denominator:
Weighted-average shares outstanding - basic (in shares)	18,780,000	18,712,000
Effect of dilutive shares (in shares)	219,000	62,000
Weighted-average shares outstanding - dilutive (in shares)	18,999,000	18,774,000
Basic earnings per share (in dollars per share)	$ 0.88	$ 1.67
Diluted earnings per share (in dollars per share)	$ 0.87	$ 1.66
Anti-dilutive shares excluded (in shares)	32,500	44,792