Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2011	Jun. 30, 2014 segment	Jun. 30, 2013
Segment Reporting Information [Line Items]
Number of reportable segments				3
Net Sales:
Net sales	$ 223,536	$ 209,904		$ 405,117	$ 393,380
Segment EBIT:
Segment EBIT	38,066	38,221		54,621	59,487
Reconciliation of Segment EBIT to Net Income (Loss):
Retained corporate costs	(7,627)	(6,714)		(14,752)	(12,014)
Loss on redemption of debt (note 4)	(47,191)	(2,518)		(47,191)	(2,518)
Pension settlement (note 7)	0	(715)		0	(715)
Furnace malfunction	(576)	0		(5,882)	0
Restructuring charges (note 5)	0	(1,048)		(985)	(5,928)
Abandoned property (note 14)	0	(1,781)	(2,700)	0	(1,781)
Interest expense	(5,486)	(8,126)		(13,187)	(16,561)
Income taxes	(2,354)	(4,883)		(1,176)	(5,545)
Net income (loss)	(25,168)	12,436		(28,552)	14,425
Depreciation & Amortization:
Depreciation and amortization	10,592	11,623		21,268	22,397
Capital Expenditures:
Capital Expenditures	11,934	10,889		21,835	19,771
Americas [Member]
Net Sales:
Net sales	154,450	141,815		276,375	265,350
Segment EBIT:
Segment EBIT	32,986	33,123		47,975	51,925
Depreciation & Amortization:
Depreciation and amortization	5,851	7,321		11,810	13,849
Capital Expenditures:
Capital Expenditures	9,663	7,034		16,795	13,909
EMEA [Member]
Net Sales:
Net sales	39,331	37,981		73,729	72,223
Segment EBIT:
Segment EBIT	1,910	691		2,163	(671)
Depreciation & Amortization:
Depreciation and amortization	2,738	2,507		5,364	4,993
Capital Expenditures:
Capital Expenditures	1,717	1,745		3,278	3,041
U.S. Sourcing [Member]
Net Sales:
Net sales	21,396	21,196		39,130	38,680
Segment EBIT:
Segment EBIT	2,301	3,578		3,169	5,119
Depreciation & Amortization:
Depreciation and amortization	7	9		14	18
Capital Expenditures:
Capital Expenditures	0	32		0	32
Other Segments [Member]
Net Sales:
Net sales	8,359	8,912		15,883	17,127
Segment EBIT:
Segment EBIT	869	829		1,314	3,114
Depreciation & Amortization:
Depreciation and amortization	1,628	1,398		3,272	2,772
Capital Expenditures:
Capital Expenditures	320	1,288		892	1,623
Corporate [Member]
Depreciation & Amortization:
Depreciation and amortization	368	388		808	765
Capital Expenditures:
Capital Expenditures	$ 234	$ 790		$ 870	$ 1,166