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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Executive Vice President |  |  |
Related Party Transactions [Line Items] |  |  |
Ownership percentage in third party by executive | 40.00% |  |
Inventory Purchases | Supplier Concentration Risk | Affiliated Entity |  |  |
Related Party Transactions [Line Items] |  |  |
Inventory purchases form related party | $ 5,217 | $ 6,350 | $ 8,550
Concentration risk percentage | 1.20% | 1.80% | 2.50%
Accounts Payable | Supplier Concentration Risk | Affiliated Entity |  |  |
Related Party Transactions [Line Items] |  |  |
Accounts payable, related parties | $ 1,500 | $ 1,690 |
Concentration risk percentage | 1.30% | 1.70% |

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