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Inventories, Net and Significant Suppliers - Related Party Supplier (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Executive Vice President |  |  |
Related Party Transactions [Line Items] |  |  |
Ownership percentage in third party by executive | 40.00% |  |
Cost of Goods, Total | Supplier Concentration Risk | Affiliated Entity |  |  |
Related Party Transactions [Line Items] |  |  |
Inventory purchases form related party | $ 6,350 | $ 8,550 | $ 9,188
Concentration risk | 1.80% | 2.50% | 3.20%
Accounts Payable | Supplier Concentration Risk | Affiliated Entity |  |  |
Related Party Transactions [Line Items] |  |  |
Accounts payable, related parties | $ 1,690 | $ 2,361 |
Concentration risk | 1.70% | 2.50% |

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