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Basis of Presentation - Reconciliation of Earnings Per Share (Details) $ / shares in Units, shares in Thousands, $ in Thousands			3 Months Ended		6 Months Ended
		Nov. 27, 2018	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) $ / shares shares
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Weighted average basic shares outstanding (shares)	[1]		13,655	13,888	13,696	13,858
Potentially dilutive common shares related to:
Stock options (shares)			142	149	149	149
Unvested restricted stock awards (shares)			21	29	26	32
Weighted average diluted shares outstanding (shares)	[1]		13,818	14,066	13,871	14,039
Net income | $			$ 8,235	$ 7,891	$ 15,714	$ 14,280
Basic EPS (usd per share) | $ / shares	[1]		$ 0.60	$ 0.57	$ 1.15	$ 1.03
Diluted EPS (usd per share) | $ / shares	[1]		$ 0.60	$ 0.56	$ 1.13	$ 1.02
Weighted average anti-dilutive shares not included in the calculation of diluted EPS (shares)			44	60	30	69
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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