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Debt (Australia - Ravenhall) (Details)
$ in Thousands, AUD in Millions
12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
AUD
Debt Instrument [Line Items]      
Revolver $ 70,000 $ 485,000  
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   226,300 AUD 310.0
Ravenhall | National Australia Bank Limited | Non Recourse Debt | Construction Facility      
Debt Instrument [Line Items]      
Maximum borrowing capacity   577,400 AUD 791.0
Revolver   195,500  
Deferred financing costs capitalized   $ 19,500