Summary of Significant Accounting Policies - Impairment and Intangibles (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 item	Dec. 31, 2013
Summary of Significant Accounting Policies
Impairment of long-lived assets	$ 0	$ 0
Goodwill and other intangible assets
Number of Reporting Units	1
Goodwill impairment	0	0
Impairment of indefinite-lived assets	0	0
Finite lived intangible assets
Finite-lived intangible asset impairment	$ 0	$ 0
Distribution network | Minimum
Finite lived intangible assets
Amortization period	15 years
Distribution network | Maximum
Finite lived intangible assets
Amortization period	20 years
Trademark | Minimum
Finite lived intangible assets
Amortization period	7 years
Trademark | Maximum
Finite lived intangible assets
Amortization period	25 years
Patents | Minimum
Finite lived intangible assets
Amortization period	7 years
Patents | Maximum
Finite lived intangible assets
Amortization period	20 years
Customer relations
Finite lived intangible assets
Amortization period	15 years
Customer relations | Minimum
Finite lived intangible assets
Amortization period	15 years
Customer relations | Maximum
Finite lived intangible assets
Amortization period	19 years 6 months
Noncompete agreements
Finite lived intangible assets
Amortization period	4 years
Noncompete agreements | Minimum
Finite lived intangible assets
Amortization period	4 years
Noncompete agreements | Maximum
Finite lived intangible assets
Amortization period	5 years