Adoption of Accounting Standards Codification 606 - Income Statement (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Revenues	$ 159,842	$ 138,690	$ 465,124	$ 415,925
Cost of Sales	128,726	112,603	375,225	338,563
Gross Profit	31,116	26,087	89,899	77,362
Selling, General and Administrative Expenses	20,956	18,676	61,476	59,075
Restructuring Charges	3,373	64	10,784	64
Operating Income	6,787	7,347	17,639	18,223
Interest Expense	(2,524)	(2,240)	(9,186)	(6,045)
Other Income			27
Income Before Taxes	4,290	5,595	8,480	12,666
Income tax expense (benefit)	119	940	118	2,073
Net Income	$ 4,171	$ 4,655	$ 8,362	$ 10,593
Earnings Per Share, Basic and Diluted [Abstract]
Basic earnings per share (in dollars per share)	$ 0.37	$ 0.41	$ 0.73	$ 0.94
Diluted earnings per share (in dollars per share)	$ 0.36	$ 0.41	$ 0.72	$ 0.92
Weighted-Average Number of Common Shares Outstanding
Basic (in shares)	11,404	11,241	11,382	11,276
Diluted (in shares)	11,683	11,486	11,639	11,556
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Revenues	$ (5,344)		$ (17,296)
Cost of Sales	(4,461)		(12,067)
Gross Profit	(883)		(5,229)
Selling, General and Administrative Expenses	0		0
Restructuring Charges	0		0
Operating Income	(883)		(5,229)
Interest Expense	(1,059)		(1,059)
Other Income	0		0
Income Before Taxes	(1,942)		(6,288)
Income tax expense (benefit)	(726)		(813)
Net Income	$ (1,216)		(5,475)
Earnings Per Share, Basic and Diluted [Abstract]
Basic earnings per share (in dollars per share)
Diluted earnings per share (in dollars per share)
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Revenues	$ 154,498		447,828
Cost of Sales	124,265		363,158
Gross Profit	30,233		84,670
Selling, General and Administrative Expenses	20,956		61,476
Restructuring Charges	3,373		10,784
Operating Income	5,904		12,410
Interest Expense	(3,583)		(10,245)
Other Income	27		27
Income Before Taxes	2,348		2,192
Income tax expense (benefit)	(607)		(695)
Net Income	$ 2,955		$ 2,887
Earnings Per Share, Basic and Diluted [Abstract]
Basic earnings per share (in dollars per share)	$ 0.26		$ 0.25
Diluted earnings per share (in dollars per share)	$ 0.25		$ 0.25
Weighted-Average Number of Common Shares Outstanding
Basic (in shares)	11,404		11,382
Diluted (in shares)	11,683		11,639