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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Finite-lived intangible assets    
Intangible assets, gross $ 5,912 $ 6,659
Less accumulated amortization (4,011) (3,997)
Intangible assets, net 1,901 2,662
Trade name    
Finite-lived intangible assets    
Intangible assets, gross 1,186 1,293
Patents and know-how    
Finite-lived intangible assets    
Intangible assets, gross 4,002 4,529
Customer relationships    
Finite-lived intangible assets    
Intangible assets, gross $ 724 $ 837
Minimum    
Finite-lived intangible assets    
Useful life 4 years  
Minimum | Trade name    
Finite-lived intangible assets    
Useful life 15 years  
Minimum | Patents and know-how    
Finite-lived intangible assets    
Useful life 5 years  
Minimum | Customer relationships    
Finite-lived intangible assets    
Useful life 4 years  
Maximum    
Finite-lived intangible assets    
Useful life 20 years  
Maximum | Trade name    
Finite-lived intangible assets    
Useful life 20 years  
Maximum | Patents and know-how    
Finite-lived intangible assets    
Useful life 12 years  
Maximum | Customer relationships    
Finite-lived intangible assets    
Useful life 8 years