Segments (Details) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment					3
Net Sales:
Revenues	$ 206,969		$ 214,472		$ 382,618	$ 397,142
Segment EBIT:
Segment EBIT	22,048		24,072		31,292	30,822
Reconciliation of Segment EBIT to Net Income (Loss):
Retained corporate costs	(6,756)		(8,536)		(16,206)	(15,246)
Impairment of goodwill and other intangible assets (note 16)	(46,881)		0		(46,881)	0
Interest expense	(5,879)		(5,456)		(11,511)	(10,540)
Provision for income taxes	(6,299)		(6,092)		(5,003)	(4,009)
Net income (loss)	(43,767)	$ (4,542)	3,988	$ (2,961)	(48,309)	1,027
Depreciation & Amortization:
Depreciation and amortization	9,991		11,240		19,922	23,119
Capital Expenditures:
Capital Expenditures	7,939		10,078		18,300	21,349
United States & Canada
Segment EBIT:
Segment EBIT	17,267		13,358		27,064	18,082
Depreciation & Amortization:
Depreciation and amortization	3,214		3,052		6,347	6,439
Capital Expenditures:
Capital Expenditures	2,540		5,592		5,924	12,729
Latin America
Segment EBIT:
Segment EBIT	3,187		7,433		3,836	9,583
Depreciation & Amortization:
Depreciation and amortization	3,837		4,494		7,617	9,204
Capital Expenditures:
Capital Expenditures	3,531		2,778		7,722	5,167
EMEA
Segment EBIT:
Segment EBIT	2,763		2,621		2,713	3,626
Depreciation & Amortization:
Depreciation and amortization	1,706		1,940		3,405	3,949
Capital Expenditures:
Capital Expenditures	1,392		1,449		3,738	2,743
Other Segments
Segment EBIT:
Segment EBIT	(1,169)		660		(2,321)	(469)
Depreciation & Amortization:
Depreciation and amortization	893		1,309		1,775	2,623
Capital Expenditures:
Capital Expenditures	41		142		300	262
Corporate
Depreciation & Amortization:
Depreciation and amortization	341		445		778	904
Capital Expenditures:
Capital Expenditures	435		117		616	448
Product
Net Sales:
Revenues	206,158		213,534		381,124	395,447
Product | United States & Canada
Net Sales:
Revenues	128,897		128,474		238,803	236,415
Product | Latin America
Net Sales:
Revenues	38,208		40,290		68,609	74,623
Product | EMEA
Net Sales:
Revenues	32,678		38,175		60,720	70,423
Product | Other Segments
Net Sales:
Revenues	$ 6,375		$ 6,595		$ 12,992	$ 13,986