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Inventories - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Inventories      
cost of revenues $ 508,469 $ 536,966 $ 505,844
Inventory write-down $ 25,447 $ 17,724 $ 12,298