Segments (Details)		3 Months Ended		9 Months Ended
		Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment				3
Net Sales:
Revenues		$ 191,555,000	$ 188,397,000	$ 588,697,000	$ 560,328,000
Segment EBIT:
Segment EBIT		11,475,000	14,435,000	42,297,000	30,846,000
Reconciliation of Segment EBIT to Net Loss:
Retained corporate costs		(6,683,000)	(5,701,000)	(21,929,000)	(18,087,000)
Goodwill Impairment (note 15)		0	(79,700,000)	0	(79,700,000)
Fees associated with strategic initiative (1)	[1]	(2,341,000)	0	(2,341,000)	0
Reorganization charges		0	0	0	(2,488,000)
Interest expense		(5,652,000)	(5,118,000)	(16,192,000)	(15,123,000)
Provision for income taxes		(1,758,000)	(2,731,000)	(5,767,000)	(1,665,000)
Net loss		(4,959,000)	(78,815,000)	(3,932,000)	(86,217,000)
Depreciation & Amortization:
Depreciation and amortization		11,270,000	11,233,000	34,389,000	33,616,000
Capital Expenditures:
Capital Expenditures		13,774,000	12,092,000	35,123,000	39,140,000
United States & Canada
Segment EBIT:
Segment EBIT		7,538,000	10,761,000	25,620,000	33,307,000
Depreciation & Amortization:
Depreciation and amortization		3,850,000	2,850,000	10,289,000	9,016,000
Capital Expenditures:
Capital Expenditures		6,101,000	2,751,000	18,830,000	7,145,000
Latin America
Segment EBIT:
Segment EBIT		1,727,000	3,721,000	11,310,000	2,549,000
Reconciliation of Segment EBIT to Net Loss:
Goodwill Impairment (note 15)			(79,700,000)
Depreciation & Amortization:
Depreciation and amortization		4,208,000	4,850,000	13,412,000	13,757,000
Capital Expenditures:
Capital Expenditures		3,718,000	3,937,000	8,885,000	15,401,000
EMEA
Segment EBIT:
Segment EBIT		1,358,000	1,482,000	4,984,000	(1,412,000)
Depreciation & Amortization:
Depreciation and amortization		1,835,000	1,816,000	5,784,000	5,508,000
Capital Expenditures:
Capital Expenditures		1,619,000	5,050,000	4,362,000	15,446,000
Other Segments
Segment EBIT:
Segment EBIT		852,000	(1,529,000)	383,000	(3,598,000)
Depreciation & Amortization:
Depreciation and amortization		992,000	1,138,000	3,615,000	3,821,000
Capital Expenditures:
Capital Expenditures		129,000	348,000	391,000	816,000
Corporate
Depreciation & Amortization:
Depreciation and amortization		385,000	579,000	1,289,000	1,514,000
Capital Expenditures:
Capital Expenditures		2,207,000	6,000	2,655,000	332,000
Product
Net Sales:
Revenues		190,775,000	187,339,000	586,222,000	557,847,000
Product | United States & Canada
Net Sales:
Revenues		115,304,000	112,252,000	351,719,000	343,452,000
Product | Latin America
Net Sales:
Revenues		35,406,000	35,339,000	110,029,000	102,564,000
Product | EMEA
Net Sales:
Revenues		33,289,000	33,743,000	103,712,000	90,128,000
Product | Other Segments
Net Sales:
Revenues		$ 6,776,000	$ 6,005,000	$ 20,762,000	$ 21,703,000

[1] Legal and professional fees associated with a strategic initiative that we terminated during the third quarter.