Adoption of Accounting Standards Codification 606 - Income Statement (Details) - USD ($) $ / shares in Units, 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
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
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)
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 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 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
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									$ (15,712)
Cost of Sales									(11,458)
Gross Profit									(4,254)
Selling, General and Administrative Expenses									0
Restructuring Charges									0
Operating Income									(4,254)
Interest Expense									(1,526)
Loss on Extinguishment of Debt									0
Other Income, Net									0
Income Before Taxes									(5,780)
Income Tax Expense (Benefit)									(1,120)
Net Income									(4,660)
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Revenues									613,595
Cost of Sales									495,253
Gross Profit									118,342
Selling, General and Administrative Expenses									84,007
Restructuring Charges									14,671
Operating Income									19,664
Interest Expense									(14,550)
Loss on Extinguishment of Debt									(926)
Other Income, Net									303
Income Before Taxes									4,491
Income Tax Expense (Benefit)									116
Net Income									$ 4,375
Earnings Per Share
Basic earnings per share (in dollars per share)									$ 0.38
Diluted earnings per share (in dollars per share)									$ 0.38