Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Impairment and Intangibles (Details)

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Summary of Significant Accounting Policies - Impairment and Intangibles (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
item
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Goodwill and other intangible assets      
Number of Reporting Units | item 2    
Goodwill impairment   $ 0 $ 0
Impairment of indefinite-lived assets   0 0
Finite-lived intangible asset impairment   0 0
Impairment of long-lived assets   $ 0 $ 0
Distribution network | Minimum      
Goodwill and other intangible assets      
Amortization period 15 years    
Distribution network | Maximum      
Goodwill and other intangible assets      
Amortization period 20 years    
Trademark | Minimum      
Goodwill and other intangible assets      
Amortization period 7 years    
Trademark | Maximum      
Goodwill and other intangible assets      
Amortization period 25 years    
Patents | Minimum      
Goodwill and other intangible assets      
Amortization period 7 years    
Patents | Maximum      
Goodwill and other intangible assets      
Amortization period 20 years    
Customer relations      
Goodwill and other intangible assets      
Amortization period   15 years  
Customer relations | Minimum      
Goodwill and other intangible assets      
Amortization period 15 years    
Customer relations | Maximum      
Goodwill and other intangible assets      
Amortization period 19 years 6 months    
Noncompete agreements      
Goodwill and other intangible assets      
Amortization period   4 years  
Noncompete agreements | Minimum      
Goodwill and other intangible assets      
Amortization period 4 years    
Noncompete agreements | Maximum      
Goodwill and other intangible assets      
Amortization period 5 years