Condensed Consolidated Statement of Comprehensive Income (Loss) - USD ($) shares in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net Sales		$ 225,864,000	$ 196,300,000	$ 422,066,000	$ 414,740,000
Cost of products sold		165,046,000	139,650,000	306,610,000	295,102,000
Gross Profit		60,818,000	56,650,000	115,456,000	119,638,000
Selling, general and administrative expenses		63,765,000	57,404,000	122,586,000	119,142,000
Gain on sale of business		0	200,000	0	9,790,000
Charges related to restructuring activities		547,000	1,685,000	2,099,000	3,077,000
Operating Income (Loss)		(3,494,000)	(2,239,000)	(9,229,000)	7,209,000
Loss on debt extinguishment including debt finance charges and fees		0	6,599,000	709,000	6,599,000
Interest expense		6,084,000	7,054,000	11,815,000	13,730,000
Interest Income, Other		0	23,000	1,000	83,000
Loss Before Income Taxes		(9,578,000)	(15,869,000)	(21,752,000)	(13,037,000)
Income tax provision		1,120,000	750,000	2,990,000	2,850,000
Net Loss		$ (10,698,000)	$ (16,619,000)	$ (24,742,000)	$ (15,887,000)
Dividends Declared per Common Share		$ 0	$ 0	$ 0	$ 0.0125
Net Loss per Share—Basic
Net Loss per Share—Basic		$ (0.31)	$ (0.48)	$ (0.71)	$ (0.47)
Weighted Average Shares Outstanding—Basic		34,969	34,437	34,732	34,111
Loss per Share—Assuming Dilution
Loss per Share—Assuming Dilution	[1]	$ (0.31)	$ (0.48)	$ (0.71)	$ (0.47)
Weighted Average Shares Outstanding—Assuming Dilution		35,620	34,479	35,450	34,198
Other comprehensive income (loss):
Foreign currency translation adjustments		$ 7,038,000	$ 5,109,000	$ 12,715,000	$ 915,000
Defined Benefit Plans:
Amortization of prior service costs and unrecognized losses		(744,000)		(395,000)	(169,000)
Deferred tax adjustment resulting from defined benefit plan activity		(5,000)	(2,000)	(63,000)	16,000
Valuation reserve associated with defined benefit plan activity		5,000	2,000	63,000	(16,000)
Current period gain (loss) on cash flow hedges		101,000	1,030,000	(774,000)	888,000
Deferred tax benefit (provision) related to gain on cash flow hedges		14,000	(114,000)	97,000	(114,000)
Other Comprehensive Income		6,409,000	6,025,000	11,643,000	1,520,000
Comprehensive Loss		$ (4,289,000)	$ (10,594,000)	$ (13,099,000)	$ (14,367,000)
Net Sales, as a Percent of Net Sales		100.00%	100.00%	100.00%	100.00%
Cost of Products Sold, as a Percent of Net Sales		73.10%	71.10%	72.60%	71.20%
Gross Profit, as a Percent of Net Sales		26.90%	28.90%	27.40%	28.80%
Selling, general and administrative expenses, as a Percent of Net Sales		28.20%	29.20%	29.00%	28.70%
Gain on sale of business, as a Percent of Net Sales		0.00%	(0.10%)	0.00%	(2.40%)
Charges related to restructuring activities, as a Percent of Net Sales		0.20%	0.90%	0.50%	0.70%
Operating Gain (Loss), as a Percent of Net Sales		(1.50%)	(1.10%)	(2.20%)	1.70%
Interest expense, as a Percent of Net Sales		2.70%	3.60%	2.80%	3.30%
Interest income, as a Percent of Net Sales		0.00%	0.00%	0.00%	0.00%
Gain (loss) Before Income Taxes, as a Percent of Net Sales		(4.20%)	(8.10%)	(5.20%)	(3.10%)
Income Tax Provision, as a Percent of Net Sales		0.50%	0.40%	0.70%	0.70%
Net Gain (Loss), as a percent of Net Sales		(4.70%)	(8.50%)	(5.90%)	(3.80%)
Net loss (gain) on debt extinguishment, as a Percent of Net Sales [Line Items]			3.40%	0.20%	1.60%

[1] Net loss per common share assuming dilution calculated utilizing weighted average shares outstanding-basic for the periods in which there was a net loss.