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Other Intangible Assets, Other than Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Amortized intangible assets:    
Gross carrying amount $ 20,716 $ 20,716
Accumulated amortization 16,204 13,295
Unamortized intangible assets:    
In-process research and development 722 722
Technology [Member]
    
Amortized intangible assets:    
Gross carrying amount 11,774 11,774
Weighted average amortization period 7 years 7 years
Accumulated amortization 7,430 5,762
Customer relationship [Member]
    
Amortized intangible assets:    
Gross carrying amount 8,100 8,100
Weighted average amortization period 7 years 7 years
Accumulated amortization 8,004 6,847
Patents [Member]
    
Amortized intangible assets:    
Gross carrying amount 842 842
Weighted average amortization period 6 years 6 years
Accumulated amortization $ 770 $ 686