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Fair Value of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Assets:        
Cash and cash equivalents $ 434,559 $ 68,038 $ 23,225 $ 59,638
Carrying Value        
Assets:        
Cash and cash equivalents 434,559 68,038    
Restricted cash and investments 20,797 22,319    
Liabilities:        
Borrowings under senior credit facility 973,680 804,500    
Carrying Value | Subsidiary | AUSTRALIA        
Liabilities:        
Non-recourse debt 450,585 454,222    
Carrying Value | 5.875% Senior Notes due 2024        
Liabilities:        
Senior notes 250,000 250,000    
Carrying Value | 5.125% Senior Notes        
Liabilities:        
Senior notes 300,000 300,000    
Carrying Value | 5.875% Senior Notes due 2022        
Liabilities:        
Senior notes 250,000 250,000    
Carrying Value | 6.00% Senior Notes        
Liabilities:        
Senior notes 350,000 350,000    
Carrying Value | Other non-recourse debt, including current portion        
Liabilities:        
Non-recourse debt 36,680 36,280    
Estimate of Fair Value Measurement        
Assets:        
Cash and cash equivalents 434,559 68,038    
Restricted cash and investments 20,797 22,319    
Liabilities:        
Borrowings under senior credit facility 974,743 795,008    
Estimate of Fair Value Measurement | Subsidiary | AUSTRALIA        
Liabilities:        
Non-recourse debt 450,764 454,185    
Estimate of Fair Value Measurement | 5.875% Senior Notes due 2024        
Liabilities:        
Senior notes 256,250 247,813    
Estimate of Fair Value Measurement | 5.125% Senior Notes        
Liabilities:        
Senior notes 297,375 292,125    
Estimate of Fair Value Measurement | 5.875% Senior Notes due 2022        
Liabilities:        
Senior notes 259,688 254,688    
Estimate of Fair Value Measurement | 6.00% Senior Notes        
Liabilities:        
Senior notes 354,813 346,938    
Estimate of Fair Value Measurement | Other non-recourse debt, including current portion        
Liabilities:        
Non-recourse debt 37,330 37,550    
Estimate of Fair Value Measurement | Level 1        
Assets:        
Cash and cash equivalents 434,559 68,038    
Restricted cash and investments 19,086 19,614    
Liabilities:        
Borrowings under senior credit facility 0 0    
Estimate of Fair Value Measurement | Level 1 | Subsidiary | AUSTRALIA        
Liabilities:        
Non-recourse debt 0 0    
Estimate of Fair Value Measurement | Level 1 | 5.875% Senior Notes due 2024        
Liabilities:        
Senior notes 0 0    
Estimate of Fair Value Measurement | Level 1 | 5.125% Senior Notes        
Liabilities:        
Senior notes 0 0    
Estimate of Fair Value Measurement | Level 1 | 5.875% Senior Notes due 2022        
Liabilities:        
Senior notes 0 0    
Estimate of Fair Value Measurement | Level 1 | 6.00% Senior Notes        
Liabilities:        
Senior notes 0 0    
Estimate of Fair Value Measurement | Level 1 | Other non-recourse debt, including current portion        
Liabilities:        
Non-recourse debt 0 0    
Estimate of Fair Value Measurement | Level 2        
Assets:        
Cash and cash equivalents 0 0    
Restricted cash and investments 1,711 2,705    
Liabilities:        
Borrowings under senior credit facility 974,743 795,008    
Estimate of Fair Value Measurement | Level 2 | Subsidiary | AUSTRALIA        
Liabilities:        
Non-recourse debt 450,764 454,185    
Estimate of Fair Value Measurement | Level 2 | 5.875% Senior Notes due 2024        
Liabilities:        
Senior notes 256,250 247,813    
Estimate of Fair Value Measurement | Level 2 | 5.125% Senior Notes        
Liabilities:        
Senior notes 297,375 292,125    
Estimate of Fair Value Measurement | Level 2 | 5.875% Senior Notes due 2022        
Liabilities:        
Senior notes 259,688 254,688    
Estimate of Fair Value Measurement | Level 2 | 6.00% Senior Notes        
Liabilities:        
Senior notes 354,813 346,938    
Estimate of Fair Value Measurement | Level 2 | Other non-recourse debt, including current portion        
Liabilities:        
Non-recourse debt 37,330 37,550    
Estimate of Fair Value Measurement | Level 3        
Assets:        
Cash and cash equivalents 0 0    
Restricted cash and investments 0 0    
Liabilities:        
Borrowings under senior credit facility 0 0    
Estimate of Fair Value Measurement | Level 3 | Subsidiary | AUSTRALIA        
Liabilities:        
Non-recourse debt 0 0    
Estimate of Fair Value Measurement | Level 3 | 5.875% Senior Notes due 2024        
Liabilities:        
Senior notes 0 0    
Estimate of Fair Value Measurement | Level 3 | 5.125% Senior Notes        
Liabilities:        
Senior notes 0 0    
Estimate of Fair Value Measurement | Level 3 | 5.875% Senior Notes due 2022        
Liabilities:        
Senior notes 0 0    
Estimate of Fair Value Measurement | Level 3 | 6.00% Senior Notes        
Liabilities:        
Senior notes 0 0    
Estimate of Fair Value Measurement | Level 3 | Other non-recourse debt, including current portion        
Liabilities:        
Non-recourse debt $ 0 $ 0