Goodwill and Other intangible assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Changes to the Company's Goodwill [Roll forward]
Beginning balance	$ 216,126		$ 216,126		$ 213,273
Foreign currency translation adjustments			707
Goodwill resulting from acquisition			2,146
Ending balance	216,126		216,126		213,273
Intangible Assets Combined Indefinite lived and Finite lived Intangible Assets by Major Class [Line Items]
Gross carrying amount total	104,572		104,572		102,801
Accumulated amortization	40,752		40,752		36,310
Net carrying amount	63,820		63,820		66,491
Amortization expense relating to intangible assets	1,447	1,429	4,262	3,978
Trademarks [Member]
Intangible Assets Combined Indefinite lived and Finite lived Intangible Assets by Major Class [Line Items]
Gross carrying amount - indefinite life intangible assets	55,000		55,000		55,000
Accumulated amortization	0		0		0
Net carrying amount	55,000		55,000		55,000
Technology [Member]
Intangible Assets Combined Indefinite lived and Finite lived Intangible Assets by Major Class [Line Items]
Useful life (in years)			10 years
Gross carrying amount - finite life intangible assets	16,000		16,000		16,000
Accumulated amortization	15,867		15,867		14,667
Net carrying amount	133		133		1,333
Patents and Other Trademarks [Member]
Intangible Assets Combined Indefinite lived and Finite lived Intangible Assets by Major Class [Line Items]
Gross carrying amount - finite life intangible assets	12,605		12,605		12,546
Accumulated amortization	9,671		9,671		9,180
Net carrying amount	2,934		2,934		3,366
Patents and Other Trademarks [Member] | Maximum [Member]
Intangible Assets Combined Indefinite lived and Finite lived Intangible Assets by Major Class [Line Items]
Useful life (in years)			20 years
Patents and Other Trademarks [Member] | Minimum [Member]
Intangible Assets Combined Indefinite lived and Finite lived Intangible Assets by Major Class [Line Items]
Useful life (in years)			5 years
Customer Database [Member]
Intangible Assets Combined Indefinite lived and Finite lived Intangible Assets by Major Class [Line Items]
Useful life (in years)			5 years
Gross carrying amount - finite life intangible assets	5,350		5,350		4,928
Accumulated amortization	5,350		5,350		4,928
Net carrying amount	0		0		0
Foam Formula [Member]
Intangible Assets Combined Indefinite lived and Finite lived Intangible Assets by Major Class [Line Items]
Useful life (in years)			10 years
Gross carrying amount - finite life intangible assets	3,700		3,700		3,700
Accumulated amortization	3,669		3,669		3,392
Net carrying amount	31		31		308
Reacquired Rights [Member]
Intangible Assets Combined Indefinite lived and Finite lived Intangible Assets by Major Class [Line Items]
Useful life (in years)			3 years
Gross carrying amount - finite life intangible assets	5,829		5,829		5,638
Accumulated amortization	4,857		4,857		3,289
Net carrying amount	972		972		2,349
Customer Relationships [Member]
Intangible Assets Combined Indefinite lived and Finite lived Intangible Assets by Major Class [Line Items]
Useful life (in years)			5 years
Gross carrying amount - finite life intangible assets	6,088		6,088		4,989
Accumulated amortization	1,338		1,338		854
Net carrying amount	4,750		4,750		4,135
International [Member]
Changes to the Company's Goodwill [Roll forward]
Beginning balance	106,993		106,993		104,769
Foreign currency translation adjustments			78
Goodwill resulting from acquisition			2,146
Ending balance	106,993		106,993		104,769
North America [Member]
Changes to the Company's Goodwill [Roll forward]
Beginning balance	109,133		109,133		108,504
Foreign currency translation adjustments			629
Goodwill resulting from acquisition			0
Ending balance	$ 109,133		$ 109,133		$ 108,504