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Debt - Senior Secured Facilities Agreement - Working Capital Facility (Narrative) (Details) - New Zealand JV
1 Months Ended
Jun. 30, 2016
NZD
Dec. 31, 2016
USD ($)
Dec. 31, 2016
NZD
Tranche A, Working Capital Facility      
Debt Instrument [Line Items]      
Debt instrument term 12 months    
Maximum borrowing capacity NZD 20,000,000    
Tranche B, Working Capital Facility      
Debt Instrument [Line Items]      
Debt instrument term 18 months    
Maximum borrowing capacity NZD 20,000,000    
Previous Working Capital Facility      
Debt Instrument [Line Items]      
Maximum borrowing capacity 40,000,000   NZD 40,000,000
Working Capital Facility      
Debt Instrument [Line Items]      
Maximum borrowing capacity NZD 40,000,000    
Amount outstanding | $   $ 0