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Debt (Australia - Ravenhall) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
AUD
Debt Instrument [Line Items]      
Revolver $ 515,000 $ 270,559  
Australian Subsidiary's Non Recourse Debt      
Debt Instrument [Line Items]      
Debt instrument basis spread on variable rate 1.40%    
National Australia Bank Limited | Non Recourse Debt | Construction Facility      
Debt Instrument [Line Items]      
Debt instrument basis spread on variable rate 2.00%    
Ravenhall | National Australia Bank Limited | Non Recourse Debt      
Debt Instrument [Line Items]      
Lump sum due at completion   242,000 AUD 310,000,000
Ravenhall | National Australia Bank Limited | Non Recourse Debt | Construction Facility      
Debt Instrument [Line Items]      
Maximum borrowing capacity   617,500 AUD 791,000,000
Revolver   $ 364,000