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Summary of Significant Accounting Policies - Payables and Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accounting Policies [Abstract]    
Trade accounts payable $ 63,976 $ 48,736
Accrued compensation, benefits and payroll taxes 3,708 4,288
Accrued cost of sales 4,865 5,576
Other payables and accrued expenses 2,849 819
Total accounts payable and accrued expenses $ 75,398 $ 59,419