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Legal Proceedings Legal Proceedings (Details) - USD ($)
$ in Thousands
6 Months Ended
Nov. 02, 2016
Jan. 08, 2016
Jun. 30, 2017
Jun. 30, 2016
Loss Contingencies [Line Items]        
Payment of legal settlement     $ 0 $ 32,000
Nestle Purina Litigation        
Loss Contingencies [Line Items]        
Payment of legal settlement $ 32,000      
US Consumer Class Action Lawsuit        
Loss Contingencies [Line Items]        
Payment of legal settlement   $ 32,000