Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net income	$ 108,133	$ 49,990	$ 47,319
Denominator:
Weighted average shares outstanding - basic (in shares)	18,731,000	18,681,000	18,573,000
Effect of dilutive shares (in shares)	132,000	25,000	140,000
Weighted average shares outstanding - diluted (in shares)	18,863,000	18,706,000	18,713,000
Basic earnings per share (in dollars per share)	$ 5.77	$ 2.68	$ 2.55
Diluted earnings per share (in dollars per share)	$ 5.73	$ 2.67	$ 2.53
Anti-dilutive shares excluded (in shares)	721	8,454	20,520