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Accounts Receivable, net (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts Receivable, net      
Accounts receivable $ 165,133 $ 189,569 $ 188,774
Less: Allowance for doubtful accounts 0 0 0
Less: Loss allowance (190) (290) 0
Accounts receivable, net $ 164,943 $ 189,279 $ 188,774