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Net Income per Share - Schedule of Reconciliation of Earnings per Share (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Sep. 27, 2019	Sep. 28, 2018
Numerator:
Net income	$ 4,425	$ 7,746	$ 1,134	$ 4,157	$ 6,819	$ 544	$ 13,305	$ 11,520
Denominator:
Interest on convertible notes, net of tax	0			26			0	358
Adjusted net income available to common shareholders	$ 4,425			$ 4,183			$ 13,305	$ 11,878
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Weighted average basic common shares outstanding (in shares)	29,549,308			29,080,929			29,511,143	28,458,972
Dilutive effect of stock options and unvested common shares (in shares)	405,529			313,229			212,466	221,411
Dilutive effect of convertible notes (in shares)	0			349,693			0	939,320
Weighted average diluted common shares outstanding (in shares)	29,954,837			29,743,851			29,723,609	29,619,703

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