Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net Revenues	$ 164,183	$ 159,842	$ 154,827	$ 150,455	$ 142,258	$ 138,690	$ 140,938	$ 136,297	$ 629,307	$ 558,183	$ 550,642
Cost of Sales									506,711	455,050	444,102
Gross Profit	32,697	31,116	32,028	26,755	25,772	26,087	26,269	25,005	122,596	103,133	106,540
Selling, General and Administrative Expenses									84,007	79,139	77,142
Restructuring Charges	3,800	3,400	5,400	2,200	8,800				14,671	8,360	182
Operating Income									23,918	15,634	29,216
Interest Expense									(13,024)	(8,870)	(8,922)
Gain on Divestitures, Net									0	0	17,604
Loss on Extinguishment of Debt									(926)	0	0
Other Income, Net									303	845	215
Income Before Taxes	1,791	4,290	1,833	2,357	(5,057)	5,595	4,564	2,507	10,271	7,609	38,113
Income Tax Expense (Benefit)	1,118	119	242	(243)	(14,541)	940	741	392	1,236	(12,468)	12,852
Net Income	$ 673	$ 4,171	$ 1,591	$ 2,600	$ 9,484	$ 4,655	$ 3,823	$ 2,115	$ 9,035	$ 20,077	$ 25,261
Earnings Per Share
Basic earnings (loss) per share (in dollars per share)	$ 0.06	$ 0.37	$ 0.14	$ 0.23	$ 0.84	$ 0.41	$ 0.34	$ 0.19	$ 0.79	$ 1.78	$ 2.27
Diluted earnings (loss) per share (in dollars per share)	$ 0.06	$ 0.36	$ 0.14	$ 0.22	$ 0.82	$ 0.41	$ 0.33	$ 0.18	$ 0.77	$ 1.74	$ 2.24
Weighted-Average Number of Shares Outstanding
Basic (in shares)									11,390	11,290	11,151
Diluted (in shares)									11,659	11,558	11,299