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Accounts Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Receivables [Abstract]    
Trade receivables $ 281,951 $ 217,649
Less: Allowance for doubtful accounts (7,773) (7,100)
Net trade receivables 274,178 210,549
Other receivables 5,841 2,037
Total accounts receivable $ 280,019 $ 212,586