Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013 segment		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Number of reportable segments	2
Net Sales:
Net sales	$ 204,386		$ 209,150	$ 597,766		$ 606,226
Segment EBIT:
Segment EBIT	20,524		34,202	78,424		91,245
Reconciliation of Segment EBIT to Net Income:
Retained corporate costs	(3,647)		(6,289)	(14,074)		(19,597)
Gain (loss) on redemption of debt (note 4)	0		0	(2,518)		(31,075)
Severance	0		(3,911)	0		(3,911)
Pension settlement and curtailment	(760)		125	(1,475)		125
Furnace malfunction	(2,437)		0	(2,437)		0
Restructuring charges (note 5)	(390)		0	(6,318)		0
Abandoned property (note 15)	0		0	(1,781)		0
Interest expense	(7,706)		(8,720)	(24,267)		(29,085)
Income taxes	(835)		(546)	(6,380)		(2,343)
Net income	4,749		14,861	19,174		5,359
Depreciation & Amortization:
Depreciation and amortization	11,773		10,073	34,170		30,897
Capital Expenditures:
Capital Expenditures	10,381		5,412	30,152		17,244
Segment Assets(1):
Segment assets	265,005	[1]		265,005	[1]		238,399	[1]
Americas [Member]
Net Sales:
Net sales	141,390		146,169	406,740		424,428
Segment EBIT:
Segment EBIT	20,580		27,020	71,230		73,708
Depreciation & Amortization:
Depreciation and amortization	5,975		6,045	19,824		18,248
Capital Expenditures:
Capital Expenditures	4,231		3,839	18,140		12,262
Segment Assets(1):
Segment assets	169,667	[1]		169,667	[1]		150,923	[1]
EMEA [Member]
Net Sales:
Net sales	35,491		34,454	107,714		98,969
Segment EBIT:
Segment EBIT	(258)		1,804	(1,172)		1,526
Depreciation & Amortization:
Depreciation and amortization	2,930		2,375	7,923		7,389
Capital Expenditures:
Capital Expenditures	1,307		942	4,348		2,960
Segment Assets(1):
Segment assets	49,715	[1]		49,715	[1]		49,981	[1]
Other [Member]
Net Sales:
Net sales	27,505		28,527	83,312		82,829
Segment EBIT:
Segment EBIT	202		5,378	8,366		16,011
Depreciation & Amortization:
Depreciation and amortization	2,587		1,325	5,377		4,156
Capital Expenditures:
Capital Expenditures	3,955		152	5,610		1,175
Segment Assets(1):
Segment assets	45,623	[1]		45,623	[1]		37,495	[1]
Corporate [Member]
Depreciation & Amortization:
Depreciation and amortization	281		328	1,046		1,104
Capital Expenditures:
Capital Expenditures	$ 888		$ 479	$ 2,054		$ 847

[1] Segment assets are defined as net accounts receivable plus net inventory.