Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 segment	Mar. 31, 2013
Segment Reporting Information [Line Items]
Number of reportable segments	3
Net Sales:
Net sales	$ 181,581	$ 183,476
Segment EBIT:
Segment EBIT	16,555	21,266
Reconciliation of Segment EBIT to Net Income (Loss):
Retained corporate costs	(7,125)	(5,300)
Furnace malfunction	(5,306)	0
Restructuring charges (note 5)	(985)	(4,880)
Interest expense	(7,701)	(8,435)
Income taxes	1,178	(662)
Net income (loss)	(3,384)	1,989
Depreciation & Amortization:
Depreciation and amortization	10,676	10,774
Capital Expenditures:
Capital Expenditures	9,901	8,882
Americas [Member]
Net Sales:
Net sales	121,925	123,535
Segment EBIT:
Segment EBIT	14,989	18,802
Depreciation & Amortization:
Depreciation and amortization	5,959	6,528
Capital Expenditures:
Capital Expenditures	7,132	6,875
EMEA [Member]
Net Sales:
Net sales	34,398	34,242
Segment EBIT:
Segment EBIT	253	(1,362)
Depreciation & Amortization:
Depreciation and amortization	2,626	2,486
Capital Expenditures:
Capital Expenditures	1,561	1,296
U.S. Sourcing [Member]
Net Sales:
Net sales	17,734	17,484
Segment EBIT:
Segment EBIT	868	1,541
Depreciation & Amortization:
Depreciation and amortization	7	9
Capital Expenditures:
Capital Expenditures	0	0
Other Segments [Member]
Net Sales:
Net sales	7,524	8,215
Segment EBIT:
Segment EBIT	445	2,285
Depreciation & Amortization:
Depreciation and amortization	1,644	1,374
Capital Expenditures:
Capital Expenditures	572	335
Corporate [Member]
Depreciation & Amortization:
Depreciation and amortization	440	377
Capital Expenditures:
Capital Expenditures	$ 636	$ 376