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Summary of Significant Accounting Policies:Vendor and Customer Rebates and Allowances (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Vendor and Customer Rebates and Allowances    
Vendor rebates and allowances $ 6.7 $ 7.0
Customer rebates payable $ 45.5 $ 31.6