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Acquisitions - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
May. 10, 2013
Business Acquisition [Line Items]        
Goodwill $ 72,820 $ 71,131 $ 66,271  
Florida Chemical Company, Inc [Member]        
Business Acquisition [Line Items]        
Cash       $ 331
Net working capital, net of cash       15,574
Other assets       205
Goodwill       39,328
Deferred tax impact of valuation adjustment       (25,170)
Total purchase price allocation       106,438
Personal Property [Member] | Florida Chemical Company, Inc [Member]        
Business Acquisition [Line Items]        
Property and equipment       13,400
Real Property [Member] | Florida Chemical Company, Inc [Member]        
Business Acquisition [Line Items]        
Property and equipment       6,750
Customer relationships [Member] | Florida Chemical Company, Inc [Member]        
Business Acquisition [Line Items]        
Other intangible assets       29,270
Trade names [Member] | Florida Chemical Company, Inc [Member]        
Business Acquisition [Line Items]        
Other intangible assets       12,670
Proprietary technology [Member] | Florida Chemical Company, Inc [Member]        
Business Acquisition [Line Items]        
Other intangible assets       $ 14,080