Goodwill and Other Intangible Assets - Amortization of Intangibles (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets [Abstract]
Amortization expense	$ 5,227	$ 1,750	$ 2,022
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2013 expected amortization	7,705
2014 expected amortization	7,218
2015 expected amortization	7,104
2016 expected amortization	6,919
2017 expected amortization	5,753
Expected amortization thereafter	16,800
Total expected amortization expense	51,499
Asset impairment charges	0	1,434	0
Purchased technology [Member]
Finite-Lived Intangible Assets [Abstract]
Amortization expense	0	0	358
Patents trademarks and other [Member]
Finite-Lived Intangible Assets [Abstract]
Minimum useful life	2
Maximum useful life	15
Amortization expense	1,993	1,342	1,167
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2013 expected amortization	3,110
2014 expected amortization	2,769
2015 expected amortization	2,655
2016 expected amortization	2,470
2017 expected amortization	1,921
Expected amortization thereafter	3,379
Total expected amortization expense	16,304
Customer relationships [Member]
Finite-Lived Intangible Assets [Abstract]
Minimum useful life	5
Maximum useful life	10
Amortization expense	1,168	3	0
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2013 expected amortization	2,213
2014 expected amortization	2,213
2015 expected amortization	2,213
2016 expected amortization	2,213
2017 expected amortization	1,866
Expected amortization thereafter	8,416
Total expected amortization expense	19,134
Developed technology [Member]
Finite-Lived Intangible Assets [Abstract]
Minimum useful life	5.5
Maximum useful life	10
Amortization expense	1,716	55	0
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2013 expected amortization	2,236
2014 expected amortization	2,236
2015 expected amortization	2,236
2016 expected amortization	2,236
2017 expected amortization	1,966
Expected amortization thereafter	5,005
Total expected amortization expense	15,915
Note issuance costs [Member]
Finite-Lived Intangible Assets [Abstract]
Useful life	7
Amortization expense	350	350	497
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2013 expected amortization	146
2014 expected amortization	0
2015 expected amortization	0
2016 expected amortization	0
2017 expected amortization	0
Expected amortization thereafter	0
Total expected amortization expense	$ 146