Intangible Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Intangible assets subject to amortization [Line Items]
Gross carrying amount	$ 69,707,000	$ 48,664,000
Accumulated amortization	(24,161,000)	(19,193,000)
Currency exchange	(7,051,000)	(7,760,000)
Net	38,495,000	21,711,000
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross carrying amount	6,403,000	3,162,000
Currency exchange	(561,000)	(676,000)
Net	5,842,000	2,486,000
Total Intangible Assets - Gross Carrying Amount	76,110,000	51,826,000
Total Intangible Assets - Accumulated Amortization	(24,161,000)	(19,193,000)
Total Intangible Assets - Currency Exchange and Other	(7,612,000)	(8,436,000)
Total Intangible Assets - Net	44,337,000	24,197,000
Amortization expense, intangible assets	5,000,000	5,000,000	4,000,000
Trademarks [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross carrying amount	6,403,000	3,162,000
Currency exchange	(561,000)	(676,000)
Net	5,842,000	2,486,000
Patents [Member]
Intangible assets subject to amortization [Line Items]
Gross carrying amount	11,795,000	10,892,000
Accumulated amortization	(5,393,000)	(4,619,000)
Currency exchange	(273,000)	(339,000)
Net	6,129,000	5,934,000
Patents [Member] | Minimum [Member]
Intangible assets subject to amortization [Line Items]
Useful life	5 years	5 years
Patents [Member] | Maximum [Member]
Intangible assets subject to amortization [Line Items]
Useful life	15 years	15 years
Software License [Member]
Intangible assets subject to amortization [Line Items]
Useful life	3 years	3 years
Gross carrying amount	1,212,000	1,212,000
Accumulated amortization	(1,149,000)	(1,149,000)
Currency exchange	(63,000)	(63,000)
Net	0	0
Developed Technology [Member]
Intangible assets subject to amortization [Line Items]
Gross carrying amount	42,408,000	29,643,000
Accumulated amortization	(15,316,000)	(11,765,000)
Currency exchange	(5,481,000)	(5,958,000)
Net	21,611,000	11,920,000
Developed Technology [Member] | Minimum [Member]
Intangible assets subject to amortization [Line Items]
Useful life	2 years	2 years
Developed Technology [Member] | Maximum [Member]
Intangible assets subject to amortization [Line Items]
Useful life	10 years	10 years
Customer Relationships [Member]
Intangible assets subject to amortization [Line Items]
Useful life	12 years	12 years
Gross carrying amount	14,292,000	6,917,000
Accumulated amortization	(2,303,000)	(1,660,000)
Currency exchange	(1,234,000)	(1,400,000)
Net	$ 10,755,000	$ 3,857,000