Significant Accounting Policies - Earnings (Loss) Per Share (Details) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Denominator:
Denominator for basic earnings (loss) per share (in shares)	22,726,767	22,585,515	22,515,161
Effect of dilutive securities:
Supplemental executive retirement plan (in shares)	35,364	40,859	48,047
Denominator for diluted earnings (loss) per share (in shares)	22,948,632	22,877,743	22,674,182
Restricted Stock
Effect of dilutive securities:
Unvested stock units (in shares)	150,754	185,965	110,974
Performance Shares
Effect of dilutive securities:
Unvested stock units (in shares)	35,747	65,404	0