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Accounts Receivable - Components of Accounts Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Accounts Receivable    
Accounts receivable, gross $ 76,032 $ 70,941
Less: Allowance for doubtful accounts (435) (357)
Accounts receivable, net $ 75,597 $ 70,584