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Fair Value of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Assets:        
Cash and cash equivalents $ 38,865 $ 59,638 $ 47,044 $ 41,337
Carrying Value        
Assets:        
Cash and cash equivalents 38,865 59,638    
Restricted cash and investments 80,016 15,654    
Liabilities:        
Borrowings under senior credit facility 741,000 777,500    
Carrying Value | Subsidiary | AUSTRALIA        
Liabilities:        
Non-recourse debt 366,164 204,539    
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      
Carrying Value | 6.625% Senior Notes        
Liabilities:        
Senior notes   300,000    
Carrying Value | Other non recourse debt including current portion        
Liabilities:        
Non-recourse debt 42,668 42,592    
Estimate of Fair Value Measurement        
Assets:        
Cash and cash equivalents 38,865 59,638    
Restricted cash and investments 80,016 15,654    
Liabilities:        
Borrowings under senior credit facility 741,728 777,500    
Estimate of Fair Value Measurement | Subsidiary | AUSTRALIA        
Liabilities:        
Non-recourse debt 366,120 204,531    
Estimate of Fair Value Measurement | 5.875% Senior Notes due 2024        
Liabilities:        
Senior notes, fair value 253,438 245,783    
Estimate of Fair Value Measurement | 5.125% Senior Notes        
Liabilities:        
Senior notes, fair value 292,500 285,189    
Estimate of Fair Value Measurement | 5.875% Senior Notes due 2022        
Liabilities:        
Senior notes, fair value 253,438 248,125    
Estimate of Fair Value Measurement | 6.00% Senior Notes        
Liabilities:        
Senior notes, fair value 351,313      
Estimate of Fair Value Measurement | 6.625% Senior Notes        
Liabilities:        
Senior notes, fair value   308,625    
Estimate of Fair Value Measurement | Other non recourse debt including current portion        
Liabilities:        
Non-recourse debt 45,047 43,353    
Estimate of Fair Value Measurement | Level 1        
Assets:        
Cash and cash equivalents 38,865 59,638    
Restricted cash and investments 75,160 11,536    
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, fair value 0 0    
Estimate of Fair Value Measurement | Level 1 | 5.125% Senior Notes        
Liabilities:        
Senior notes, fair value 0 0    
Estimate of Fair Value Measurement | Level 1 | 5.875% Senior Notes due 2022        
Liabilities:        
Senior notes, fair value 0 0    
Estimate of Fair Value Measurement | Level 1 | 6.00% Senior Notes        
Liabilities:        
Senior notes, fair value 0      
Estimate of Fair Value Measurement | Level 1 | 6.625% Senior Notes        
Liabilities:        
Senior notes, fair value   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 4,856 4,118    
Liabilities:        
Borrowings under senior credit facility 741,728 777,500    
Estimate of Fair Value Measurement | Level 2 | Subsidiary | AUSTRALIA        
Liabilities:        
Non-recourse debt 366,120 204,531    
Estimate of Fair Value Measurement | Level 2 | 5.875% Senior Notes due 2024        
Liabilities:        
Senior notes, fair value 253,438 245,783    
Estimate of Fair Value Measurement | Level 2 | 5.125% Senior Notes        
Liabilities:        
Senior notes, fair value 292,500 285,189    
Estimate of Fair Value Measurement | Level 2 | 5.875% Senior Notes due 2022        
Liabilities:        
Senior notes, fair value 253,438 248,125    
Estimate of Fair Value Measurement | Level 2 | 6.00% Senior Notes        
Liabilities:        
Senior notes, fair value 351,313      
Estimate of Fair Value Measurement | Level 2 | 6.625% Senior Notes        
Liabilities:        
Senior notes, fair value   308,625    
Estimate of Fair Value Measurement | Level 2 | Other non recourse debt including current portion        
Liabilities:        
Non-recourse debt 45,047 43,353    
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, fair value 0 0    
Estimate of Fair Value Measurement | Level 3 | 5.125% Senior Notes        
Liabilities:        
Senior notes, fair value 0 0    
Estimate of Fair Value Measurement | Level 3 | 5.875% Senior Notes due 2022        
Liabilities:        
Senior notes, fair value 0 0    
Estimate of Fair Value Measurement | Level 3 | 6.00% Senior Notes        
Liabilities:        
Senior notes, fair value 0      
Estimate of Fair Value Measurement | Level 3 | 6.625% Senior Notes        
Liabilities:        
Senior notes, fair value   0    
Estimate of Fair Value Measurement | Level 3 | Other non recourse debt including current portion        
Liabilities:        
Non-recourse debt $ 0 $ 0