Goodwill and Other Intangible Assets - Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, accumulated amortization	$ (12,924)	$ (10,984)
Finite-lived intangible assets, net	48,806	51,499
Patents trademarks and other [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	22,222	22,047
Finite-lived intangible assets, accumulated amortization	(6,567)	(5,743)
Finite-lived intangible assets, net	15,655	16,304
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	19,709	20,305
Finite-lived intangible assets, accumulated amortization	(1,676)	(1,171)
Finite-lived intangible assets, net	18,033	19,134
Developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	17,355	17,686
Finite-lived intangible assets, accumulated amortization	(2,295)	(1,771)
Finite-lived intangible assets, net	15,060	15,915
Note issuance costs [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	2,445	2,445
Finite-lived intangible assets, accumulated amortization	(2,387)	(2,299)
Finite-lived intangible assets, net	$ 58	$ 146