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Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepayments to suppliers $ 7,122 $ 2,774
Employee-related receivables 153 94
Prepaid expenses 12,296 9,475
Other debtors 3,442 3,687
Derivative instruments 151 0
Gross book value at end of period 23,164 16,030
(Less) Allowance for doubtful accounts 0 0
Net book value at end of period $ 23,164 $ 16,030