Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended							12 Months Ended
	Mar. 31, 2013 segment		Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Number of reportable segments	2
Net Sales:
Net sales	$ 183,476		$ 219,061		$ 209,150	$ 209,247	$ 187,829	$ 825,287
Segment EBIT:
Segment EBIT	20,466		24,101		34,202	36,824	20,219	115,346
Reconciliation of Segment EBIT to Net Income:
Retained corporate costs	(4,500)		(4,816)		(6,289)	(7,428)	(5,880)	(24,413)
Restructuring charges (note 5)	(4,880)						0
Severance Costs			(1,239)		(3,911)	0	0	(5,150)
Gain (loss) on redemption of debt			0		0	(31,075)	0	(31,075)
Pension curtailment and settlement			(4,431)		125	0	0	(4,306)
Interest expense	(8,435)		(8,642)		(8,720)	(9,957)	(10,408)	(37,727)
Income taxes	(662)		(3,366)		(546)	1,493	(3,290)	(5,709)
Net income	1,989		1,607		14,861	(10,143)	641	6,966
Depreciation & Amortization:
Depreciation and amortization	10,774		10,574		10,073	10,288	10,536	41,471
Capital Expenditures:
Capital expenditures	8,882		15,476		5,412	5,386	6,446	32,720
Segment Assets(1):
Segment assets	253,638	[1]	238,399	[1]				238,399	[1]
Americas [Member]
Net Sales:
Net sales	123,535		156,306		146,169	148,584	129,675	580,734
Segment EBIT:
Segment EBIT	18,152		22,125		27,020	31,014	15,674	95,833
Depreciation & Amortization:
Depreciation and amortization	6,528		6,413		6,045	6,021	6,182	24,661
Capital Expenditures:
Capital expenditures	6,875		11,759		3,839	3,259	5,164	24,021
Segment Assets(1):
Segment assets	160,827	[1]	150,923	[1]				150,923	[1]
EMEA [Member]
Net Sales:
Net sales	34,242		35,809		34,454	33,723	30,792	134,778
Segment EBIT:
Segment EBIT	(1,483)		(2,240)		1,804	302	(580)	(714)
Depreciation & Amortization:
Depreciation and amortization	2,486		2,357		2,375	2,466	2,548	9,746
Capital Expenditures:
Capital expenditures	1,296		2,499		942	1,301	717	5,459
Segment Assets(1):
Segment assets	48,292	[1]	49,981	[1]				49,981	[1]
Other [Member]
Net Sales:
Net sales	25,699		26,946		28,527	26,940	27,362	109,775
Segment EBIT:
Segment EBIT	3,797		4,216		5,378	5,508	5,125	20,227
Depreciation & Amortization:
Depreciation and amortization	1,383		1,661		1,325	1,414	1,417	5,817
Capital Expenditures:
Capital expenditures	335		1,021		152	510	513	2,196
Segment Assets(1):
Segment assets	44,519	[1]	37,495	[1]				37,495	[1]
Corporate [Member]
Depreciation & Amortization:
Depreciation and amortization	377		143		328	387	389	1,247
Capital Expenditures:
Capital expenditures	$ 376		$ 197		$ 479	$ 316	$ 52	$ 1,044

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