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Fair Value of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Assets:        
Cash and cash equivalents $ 23,225 $ 59,638 $ 68,981 $ 41,337
Carrying Value        
Assets:        
Cash and cash equivalents 23,225 59,638    
Restricted cash and investments 48,306 15,654    
Liabilities:        
Borrowings under senior credit facility 805,750 777,500    
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 | 6.625% Senior Notes        
Liabilities:        
Senior notes 300,000 300,000    
Carrying Value | Other non recourse debt including current portion        
Liabilities:        
Non-recourse debt 7,855 42,592    
Estimate of Fair Value Measurement        
Assets:        
Cash and cash equivalents 23,225 59,638    
Restricted cash and investments 48,306 15,654    
Liabilities:        
Borrowings under senior credit facility 802,204 777,500    
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 292,875 285,189    
Estimate of Fair Value Measurement | 5.875% Senior Notes due 2022        
Liabilities:        
Senior notes, fair value 258,125 248,125    
Estimate of Fair Value Measurement | 6.625% Senior Notes        
Liabilities:        
Senior notes, fair value 311,250 308,625    
Estimate of Fair Value Measurement | Other non recourse debt including current portion        
Liabilities:        
Non-recourse debt 7,821 43,353    
Level 1 | Estimate of Fair Value Measurement        
Assets:        
Cash and cash equivalents 23,225 59,638    
Restricted cash and investments 43,691 11,536    
Liabilities:        
Borrowings under senior credit facility 0 0    
Level 1 | Estimate of Fair Value Measurement | 5.875% Senior Notes due 2024        
Liabilities:        
Senior notes, fair value 0 0    
Level 1 | Estimate of Fair Value Measurement | 5.125% Senior Notes        
Liabilities:        
Senior notes, fair value 0 0    
Level 1 | Estimate of Fair Value Measurement | 5.875% Senior Notes due 2022        
Liabilities:        
Senior notes, fair value 0 0    
Level 1 | Estimate of Fair Value Measurement | 6.625% Senior Notes        
Liabilities:        
Senior notes, fair value 0 0    
Level 1 | Estimate of Fair Value Measurement | Other non recourse debt including current portion        
Liabilities:        
Non-recourse debt 0 0    
Level 2 | Estimate of Fair Value Measurement        
Assets:        
Cash and cash equivalents 0 0    
Restricted cash and investments 4,615 4,118    
Liabilities:        
Borrowings under senior credit facility 802,204 777,500    
Level 2 | Estimate of Fair Value Measurement | 5.875% Senior Notes due 2024        
Liabilities:        
Senior notes, fair value 253,438 245,783    
Level 2 | Estimate of Fair Value Measurement | 5.125% Senior Notes        
Liabilities:        
Senior notes, fair value 292,875 285,189    
Level 2 | Estimate of Fair Value Measurement | 5.875% Senior Notes due 2022        
Liabilities:        
Senior notes, fair value 258,125 248,125    
Level 2 | Estimate of Fair Value Measurement | 6.625% Senior Notes        
Liabilities:        
Senior notes, fair value 311,250 308,625    
Level 2 | Estimate of Fair Value Measurement | Other non recourse debt including current portion        
Liabilities:        
Non-recourse debt 7,821 43,353    
Level 3 | Estimate of Fair Value Measurement        
Assets:        
Cash and cash equivalents 0 0    
Restricted cash and investments 0 0    
Liabilities:        
Borrowings under senior credit facility 0 0    
Level 3 | Estimate of Fair Value Measurement | 5.875% Senior Notes due 2024        
Liabilities:        
Senior notes, fair value 0 0    
Level 3 | Estimate of Fair Value Measurement | 5.125% Senior Notes        
Liabilities:        
Senior notes, fair value 0 0    
Level 3 | Estimate of Fair Value Measurement | 5.875% Senior Notes due 2022        
Liabilities:        
Senior notes, fair value 0 0    
Level 3 | Estimate of Fair Value Measurement | 6.625% Senior Notes        
Liabilities:        
Senior notes, fair value 0 0    
Level 3 | Estimate of Fair Value Measurement | Other non recourse debt including current portion        
Liabilities:        
Non-recourse debt 0 0    
AUSTRALIA | Subsidiary | Carrying Value        
Liabilities:        
Non-recourse debt 320,811 204,539    
AUSTRALIA | Subsidiary | Estimate of Fair Value Measurement        
Liabilities:        
Non-recourse debt 323,534 204,531    
AUSTRALIA | Level 1 | Subsidiary | Estimate of Fair Value Measurement        
Liabilities:        
Non-recourse debt 0 0    
AUSTRALIA | Level 2 | Subsidiary | Estimate of Fair Value Measurement        
Liabilities:        
Non-recourse debt 323,534 204,531    
AUSTRALIA | Level 3 | Subsidiary | Estimate of Fair Value Measurement        
Liabilities:        
Non-recourse debt $ 0 $ 0