Adoption of Accounting Standards Codification 606 - Income Statement (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Revenues	$ 154,827	$ 140,938	$ 305,282	$ 277,235
Cost of Sales	122,799	114,669	246,499	225,961
Gross Profit	32,028	26,269	58,783	51,274
Selling, General and Administrative Expenses	21,194	19,646	40,521	40,399
Restructuring Charges	5,238	0	7,411	0
Operating Income	5,596	6,623	10,851	10,875
Interest Expense	(3,763)	(2,059)	(6,661)	(3,804)
Income Before Taxes	1,833	4,564	4,190	7,071
Income tax expense (benefit)	242	741	(1)	1,133
Net Income	$ 1,591	$ 3,823	$ 4,191	$ 5,938
Earnings Per Share, Basic and Diluted [Abstract]
Basic earnings per share (in dollars per share)	$ 0.14	$ 0.34	$ 0.37	$ 0.53
Diluted earnings per share (in dollars per share)	$ 0.14	$ 0.33	$ 0.36	$ 0.51
Weighted-Average Number of Common Shares Outstanding
Basic (in shares)	11,394	11,237	11,370	11,253
Diluted (in shares)	11,624	11,491	11,609	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	$ 45		$ (11,952)
Cost of Sales	2,597		(7,606)
Gross Profit	(2,552)		(4,346)
Selling, General and Administrative Expenses	0		0
Restructuring Charges	0		0
Operating Income	(2,552)		(4,346)
Interest Expense	0		0
Income Before Taxes	(2,552)		(4,346)
Income tax expense (benefit)	(11)		(87)
Net Income	$ (2,541)		(4,259)
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	$ 154,872		293,330
Cost of Sales	125,396		238,893
Gross Profit	29,476		54,437
Selling, General and Administrative Expenses	21,194		40,521
Restructuring Charges	5,238		7,411
Operating Income	3,044		6,505
Interest Expense	(3,763)		(6,661)
Income Before Taxes	(719)		(156)
Income tax expense (benefit)	231		(88)
Net Income	$ (950)		$ (68)
Earnings Per Share, Basic and Diluted [Abstract]
Basic earnings per share (in dollars per share)	$ (0.08)		$ (0.01)
Diluted earnings per share (in dollars per share)	$ (0.08)		$ (0.01)
Weighted-Average Number of Common Shares Outstanding
Basic (in shares)	11,394		11,370
Diluted (in shares)	11,394		11,370