Condensed Consolidated Statement of Comprehensive Income (Loss) - USD ($) shares in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net Sales		$ 196,300,000	$ 235,858,000	$ 414,740,000	$ 459,277,000
Cost of products sold		139,650,000	170,792,000	295,102,000	332,756,000
Gross Profit		56,650,000	65,066,000	119,638,000	126,521,000
Selling, general and administrative expenses		57,404,000	68,255,000	119,142,000	133,496,000
Gain on sale of business		200,000	0	9,790,000	0
Charges related to restructuring activities		1,685,000	1,321,000	3,077,000	2,013,000
Operating Income (Loss)		(2,239,000)	(4,510,000)	7,209,000	(8,988,000)
Net gain on convertible debt derivatives		0	(1,470,000)	0	(1,197,000)
Loss on debt extinguishment including debt finance charges and fees		6,599,000	0	6,599,000	0
Interest expense		7,054,000	7,721,000	13,730,000	15,035,000
Interest Income, Other		23,000	119,000	83,000	248,000
Loss Before Income Taxes		(15,869,000)	(10,642,000)	(13,037,000)	(22,578,000)
Income tax provision		750,000	2,075,000	2,850,000	4,025,000
Net Loss		$ (16,619,000)	$ (12,717,000)	$ (15,887,000)	$ (26,603,000)
Dividends Declared per Common Share		$ 0	$ 0.0125	$ 0.0125	$ 0.0250
Net Loss per Share—Basic
Net Loss per Share—Basic		$ (0.48)	$ (0.38)	$ (0.47)	$ (0.79)
Weighted Average Shares Outstanding—Basic		34,437	33,749	34,111	33,527
Net Loss per Share—Assuming Dilution
Net Loss per Share—Assuming Dilution	[1]	$ (0.48)	$ (0.38)	$ (0.47)	$ (0.79)
Weighted Average Shares Outstanding—Assuming Dilution		34,479	33,764	34,198	33,539
Other comprehensive income (loss):
Foreign currency translation adjustments		$ 5,109,000	$ (9,086,000)	$ 915,000	$ (3,984,000)
Defined Benefit Plans:
Amortization of prior service costs and unrecognized (losses) gains		0	(101,000)	(169,000)	(75,000)
Deferred tax adjustment resulting from defined benefit plan activity		(2,000)	22,000	16,000	16,000
Valuation reserve associated with defined benefit plan activity		2,000	(22,000)	(16,000)	(16,000)
Current period gain on cash flow hedges		1,030,000	1,685,000	888,000	1,176,000
Deferred tax loss related to gain on cash flow hedges		(114,000)	(160,000)	(114,000)	(139,000)
Other Comprehensive Income (Loss)		6,025,000	(7,662,000)	1,520,000	(3,022,000)
Comprehensive Loss		$ (10,594,000)	$ (20,379,000)	$ (14,367,000)	$ (29,625,000)
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		71.10%	72.40%	71.20%	72.50%
Gross Profit, as a Percent of Net Sales		28.90%	27.60%	28.80%	27.50%
Selling, general and administrative expenses, as a Percent of Net Sales		29.20%	28.90%	28.70%	29.10%
Gain on sale of business, as a Percent of Net Sales		(0.10%)	0.00%	(2.40%)	0.00%
Charges related to restructuring activities, as a Percent of Net Sales		0.90%	0.60%	0.70%	0.40%
Operating Gain (Loss), as a Percent of Net Sales		(1.10%)	(1.90%)	1.70%	(2.00%)
Net loss (gain) on convertible debt derivatives, as a Percent of Net Sales		0.00%	(0.60%)	0.00%	(0.30%)
Interest expense, as a Percent of Net Sales		3.60%	3.30%	3.30%	3.30%
Interest income, as a Percent of Net Sales		0.00%	(0.10%)	0.00%	(0.10%)
Gain (loss) Before Income Taxes, as a Percent of Net Sales		(8.10%)	(4.50%)	(3.10%)	(4.90%)
Income Tax Provision, as a Percent of Net Sales		0.40%	0.90%	0.70%	0.90%
Net Gain (Loss), as a percent of Net Sales		(8.50%)	(5.40%)	(3.80%)	(5.80%)
Net loss (gain) on debt extinguishment, as a Percent of Net Sales [Line Items]		3.40%		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.