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Inventories, net - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]        
Charges related to a lower of cost and net realizable value adjustment $ 51,181 $ 51,181 $ 0 $ 0