Segments (Details) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) segment	Sep. 30, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment				3
Net Sales:
Net sales		$ 196,873	$ 201,784	$ 587,582	$ 603,200
Segment EBIT:
Segment EBIT		20,406	28,281	71,020	80,513
Reconciliation of Segment EBIT to Net Income:
Retained corporate costs		(6,925)	(7,969)	(20,699)	(26,626)
Pension settlement		0	0	(212)	0
Environmental obligation (note 13)		0	100	0	(123)
Reorganization charges (1)	[1]	0	(1,176)	0	(4,191)
Derivatives (2)	[2]	11	(42)	1,150	125
Product portfolio optimization (3)	[3]	0	0	(6,784)	0
Executive terminations		98	0	(4,521)	(235)
Interest expense		(5,231)	(4,701)	(15,629)	(13,762)
(Provision) benefit for income taxes		(5,450)	2,226	(12,003)	(1,476)
Net income		2,909	16,719	12,322	34,225
Depreciation & Amortization:
Depreciation and amortization		11,234	10,633	36,669	31,286
Capital Expenditures:
Capital Expenditures		8,012	8,244	23,523	41,480
United States & Canada
Net Sales:
Net sales		119,345	120,600	358,613	357,954
Segment EBIT:
Segment EBIT		19,501	20,842	57,740	57,017
Depreciation & Amortization:
Depreciation and amortization		2,883	3,010	9,718	8,789
Capital Expenditures:
Capital Expenditures		3,037	2,666	9,030	23,434
Latin America
Net Sales:
Net sales		40,149	42,372	114,988	126,838
Segment EBIT:
Segment EBIT		1,944	6,280	14,084	18,371
Depreciation & Amortization:
Depreciation and amortization		4,667	3,662	13,725	10,377
Capital Expenditures:
Capital Expenditures		2,041	3,160	5,717	11,170
EMEA
Net Sales:
Net sales		30,147	30,572	88,043	91,207
Segment EBIT:
Segment EBIT		(660)	254	(1,702)	1,274
Depreciation & Amortization:
Depreciation and amortization		1,885	2,131	7,660	6,445
Capital Expenditures:
Capital Expenditures		1,549	1,726	4,656	4,501
Other Segments
Net Sales:
Net sales		7,232	8,240	25,938	27,201
Segment EBIT:
Segment EBIT		(379)	905	898	3,851
Depreciation & Amortization:
Depreciation and amortization		1,325	1,462	4,162	4,434
Capital Expenditures:
Capital Expenditures		939	451	2,529	991
Corporate
Depreciation & Amortization:
Depreciation and amortization		474	368	1,404	1,241
Capital Expenditures:
Capital Expenditures		$ 446	$ 241	$ 1,591	$ 1,384

[1] Management reorganization to support our growth strategy.

[2] Derivatives relate to hedge ineffectiveness on our natural gas contracts, as well as, mark-to-market adjustments on our natural gas contracts that have been de-designated and those for which we did not elect hedge accounting.

[3] Product portfolio optimization relates to inventory reductions to simplify and improve our operations.