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Inventories, Net and Significant Suppliers - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Executive Vice President
Related Party Transaction [Line Items]
Ownership percentage in third party by executive	40.00%
Related Party Supplier | Supplier Concentration Risk | Inventory Purchases
Related Party Transaction [Line Items]
Inventory purchases from related party	$ 1.1

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Related party transaction, ownership percentage by affiliated entity

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