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Basis of Presentation - Reconciliation of Earnings Per Share (Details) $ / shares in Units, shares in Thousands, $ in Thousands			3 Months Ended		9 Months Ended
		Nov. 27, 2018	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) $ / shares shares
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Weighted average basic shares outstanding (in shares)	[1]		13,571	13,900	13,654	13,872
Potentially dilutive common shares related to:
Stock options (in shares)			141	177	146	158
Unvested restricted stock awards (in shares)			23	33	25	32
Weighted average diluted shares outstanding (in shares)	[1]		13,735	14,110	13,825	14,062
Net income | $			$ 9,448	$ 8,680	$ 25,162	$ 22,960
Basic EPS (in usd per share) | $ / shares	[1]		$ 0.70	$ 0.63	$ 1.84	$ 1.66
Diluted EPS (in usd per share) | $ / shares	[1]		$ 0.69	$ 0.62	$ 1.82	$ 1.64
Weighted average anti-dilutive shares not included in the calculation of diluted EPS (in shares)			39	0	34	2
Stock split, conversion ratio		2
[1] Share and per share data have been adjusted to reflect the two-for-one stock split effective November 27, 2018.

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