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Accounts Receivable - Components of Accounts Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accounts Receivable    
Accounts receivable, gross $ 80,984 $ 79,902
Less: Allowance for doubtful accounts (195) (384)
Accounts receivable, net $ 80,789 $ 79,518