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Related Party Transactions - 3PI Lease Agreement (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Limited Liability Company        
Related Party Transaction [Line Items]        
Expenses from transactions with related party $ 0.5 $ 0.5 $ 0.5 $ 0.4