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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Finite-lived intangible assets    
Intangible assets, gross $ 6,167 $ 5,912
Less accumulated amortization (4,296) (4,011)
Intangible assets, net 1,871 1,901
Trade name    
Finite-lived intangible assets    
Intangible assets, gross 1,222 1,186
Patents and know-how    
Finite-lived intangible assets    
Intangible assets, gross 4,180 4,002
Customer relationships    
Finite-lived intangible assets    
Intangible assets, gross $ 765 $ 724
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 | 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