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Fair Value of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Assets:          
Cash and cash equivalents $ 47,131 $ 41,337 $ 52,680 $ 52,680 $ 52,125
Liabilities:          
Senior notes, fair value 0        
5.125% Senior Notes          
Liabilities:          
Senior notes, fair value 0 0      
Carrying Value          
Assets:          
Cash and cash equivalents 47,131 41,337      
Restricted cash 21,988 12,638      
Liabilities:          
Borrowings under senior credit facility 783,250 365,500      
Carrying Value | 5.875% Senior Notes          
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          
Liabilities:          
Senior notes 250,000 300,000      
Carrying Value | 6.625% Senior Notes          
Liabilities:          
Senior notes 300,000 250,000      
Carrying Value | Other non recourse debt including current portion          
Liabilities:          
Non-recourse debt 48,815 48,836      
Estimate of Fair Value Measurement          
Assets:          
Cash and cash equivalents 47,131 41,337      
Restricted cash 21,988 12,638      
Liabilities:          
Borrowings under senior credit facility 784,716 364,411      
Estimate of Fair Value Measurement | 5.875% Senior Notes          
Liabilities:          
Senior notes, fair value 253,438 256,720      
Estimate of Fair Value Measurement | 5.125% Senior Notes          
Liabilities:          
Senior notes, fair value 298,875 315,750      
Estimate of Fair Value Measurement | 5.875% Senior Notes          
Liabilities:          
Senior notes, fair value 257,813 296,814      
Estimate of Fair Value Measurement | 6.625% Senior Notes          
Liabilities:          
Senior notes, fair value 309,562 256,720      
Estimate of Fair Value Measurement | Other non recourse debt including current portion          
Liabilities:          
Non-recourse debt 51,436 52,016      
Level 1 | Estimate of Fair Value Measurement          
Assets:          
Cash and cash equivalents 47,131 41,337      
Restricted cash 8,086 3,889      
Liabilities:          
Borrowings under senior credit facility 0 0      
Level 1 | Estimate of Fair Value Measurement | 5.875% Senior Notes          
Liabilities:          
Senior notes, fair value 0 0      
Level 1 | Estimate of Fair Value Measurement | 5.875% Senior Notes          
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 13,902 8,749      
Liabilities:          
Borrowings under senior credit facility 784,716 364,411      
Level 2 | Estimate of Fair Value Measurement | 5.875% Senior Notes          
Liabilities:          
Senior notes, fair value 253,438 256,720      
Level 2 | Estimate of Fair Value Measurement | 5.125% Senior Notes          
Liabilities:          
Senior notes, fair value 298,875 315,750      
Level 2 | Estimate of Fair Value Measurement | 5.875% Senior Notes          
Liabilities:          
Senior notes, fair value 257,813 296,814      
Level 2 | Estimate of Fair Value Measurement | 6.625% Senior Notes          
Liabilities:          
Senior notes, fair value 309,562 256,720      
Level 2 | Estimate of Fair Value Measurement | Other non recourse debt including current portion          
Liabilities:          
Non-recourse debt 51,436 52,016      
Level 3 | Estimate of Fair Value Measurement          
Assets:          
Cash and cash equivalents 0 0      
Restricted cash 0 0      
Liabilities:          
Borrowings under senior credit facility 0 0      
Level 3 | Estimate of Fair Value Measurement | 5.875% Senior Notes          
Liabilities:          
Senior notes, fair value 0 0      
Level 3 | Estimate of Fair Value Measurement | 5.875% Senior Notes          
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 141,984 95,714      
AUSTRALIA | Subsidiary | Estimate of Fair Value Measurement          
Liabilities:          
Non-recourse debt 142,379 95,871      
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 142,379 95,871      
AUSTRALIA | Level 3 | Subsidiary | Estimate of Fair Value Measurement          
Liabilities:          
Non-recourse debt $ 0 $ 0