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Basis of Presentation - Reconciliation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Weighted average basic shares outstanding (in shares)	13,539	13,571	13,526	13,654
Potentially dilutive common shares related to:
Stock options (in shares)	53	141	71	146
Unvested restricted stock awards (in shares)	18	23	20	25
Weighted average diluted shares outstanding (in shares)	13,610	13,735	13,617	13,825
Net income	$ 7,491	$ 9,448	$ 22,125	$ 25,162
Basic EPS (in dollars per share)	$ 0.55	$ 0.70	$ 1.64	$ 1.84
Diluted EPS (in dollars per share)	$ 0.55	$ 0.69	$ 1.62	$ 1.82
Weighted average anti-dilutive shares not included in the calculation of diluted EPS (in shares)	202	39	152	34

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