Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Income Statement [Abstract]
Net Revenues	$ 150,371	$ 181,101	$ 471,155	$ 534,162
Cost of Sales	116,906	142,774	368,218	422,076
Gross Profit	33,465	38,327	102,937	112,086
Selling, General and Administrative Expenses	22,093	23,724	67,253	71,031
Restructuring Charges	1,107	0	1,768	0
Operating Income	10,265	14,603	33,916	41,055
Interest Expense	(3,101)	(4,363)	(11,068)	(13,140)
Other Income	99	0	99	0
Income Before Taxes	7,263	10,240	22,947	27,915
Income Tax Expense	762	1,937	3,426	4,325
Net Income	$ 6,501	$ 8,303	$ 19,521	$ 23,590
Earnings Per Share
Basic earnings per share (in dollars per share)	$ 0.56	$ 0.72	$ 1.67	$ 2.05
Diluted earnings per share (in dollars per share)	$ 0.54	$ 0.70	$ 1.64	$ 2.00
Weighted-Average Number of Common Shares Outstanding
Basic (in shares)	11,703	11,551	11,660	11,501
Diluted (in shares)	11,959	11,794	11,886	11,784