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Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepayments to suppliers $ 4,879 $ 2,774
Employee-related receivables 24 94
Tax receivables 35,332 29,552
Other debtors 1,795 3,687
Prepaid expenses 14,885 9,475
Derivative instruments 791 0
Gross book value at end of period 57,706 45,582
(Less) Allowance for doubtful accounts 0 0
Net book value at end of period $ 57,706 $ 45,582