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Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Payables and Accruals [Abstract]    
Direct costs of sales $ 4,450 $ 6,038
Accrued corporate cost expenses 3,167 2,257
Asset retirement obligations 571 40
Interest payable - cash 102 4,116
Interest payable - payment in kind 664
Other creditors 6,064 5,004
Accrued expenses, net $ 14,354 $ 18,119