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Fair Value of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Assets:        
Cash and cash equivalents $ 47,044 $ 41,337 $ 37,360 $ 52,125
5.125% Senior Notes        
Liabilities:        
Senior notes, fair value   0    
Carrying Value        
Assets:        
Cash and cash equivalents 47,044 41,337    
Restricted cash 15,774 12,638    
Liabilities:        
Borrowings under senior credit facility 747,000 365,500    
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 48,772 48,836    
Estimate of Fair Value Measurement        
Assets:        
Cash and cash equivalents 47,044 41,337    
Restricted cash 15,774 12,638    
Liabilities:        
Borrowings under senior credit facility 748,470 364,411    
Estimate of Fair Value Measurement | 5.875% Senior Notes        
Liabilities:        
Senior notes, fair value 262,813 256,720    
Estimate of Fair Value Measurement | 5.125% Senior Notes        
Liabilities:        
Senior notes, fair value 299,250 315,750    
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 311,250 256,720    
Estimate of Fair Value Measurement | Other non recourse debt including current portion        
Liabilities:        
Non-recourse debt 51,338 52,016    
Level 1 | Estimate of Fair Value Measurement        
Assets:        
Cash and cash equivalents 47,044 41,337    
Restricted cash 5,255 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 10,519 8,749    
Liabilities:        
Borrowings under senior credit facility 748,470 364,411    
Level 2 | Estimate of Fair Value Measurement | 5.875% Senior Notes        
Liabilities:        
Senior notes, fair value 262,813 256,720    
Level 2 | Estimate of Fair Value Measurement | 5.125% Senior Notes        
Liabilities:        
Senior notes, fair value 299,250 315,750    
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 311,250 256,720    
Level 2 | Estimate of Fair Value Measurement | Other non recourse debt including current portion        
Liabilities:        
Non-recourse debt 51,338 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 136,580 95,714    
AUSTRALIA | Subsidiary | Estimate of Fair Value Measurement        
Liabilities:        
Non-recourse debt 136,614 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 136,614 95,871    
AUSTRALIA | Level 3 | Subsidiary | Estimate of Fair Value Measurement        
Liabilities:        
Non-recourse debt $ 0 $ 0