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Fair Value of Assets and Liabilities (Details) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Assets:        
Cash and cash equivalents $ 37,360,000 $ 52,125,000 $ 38,511,000 $ 31,755,000
Carrying Value
       
Assets:        
Cash and cash equivalents 37,360,000 52,125,000    
Restricted cash 22,420,000 14,592,000    
Liabilities:        
Borrowings under senior credit facility 632,000,000 638,500,000    
Carrying Value | 5.875% Senior Notes [Member]
       
Liabilities:        
Senior Notes 250,000,000 250,000,000    
Carrying Value | 6.625% Senior Notes [Member]
       
Liabilities:        
Senior Notes 300,000,000 300,000,000    
Carrying Value | 5.125% Senior Notes
       
Liabilities:        
Senior Notes 300,000,000 300,000,000    
Carrying Value | Other non recourse debt including current portion [Member]
       
Liabilities:        
Non-recourse debt 60,396,000 60,235,000    
Total Fair Value
       
Assets:        
Cash and cash equivalents 37,360,000 52,125,000    
Restricted cash 22,420,000 14,592,000    
Liabilities:        
Borrowings under senior credit facility 633,114,000 639,246,000    
Total Fair Value | 5.875% Senior Notes [Member]
       
Liabilities:        
Debt Instrument, Fair Value Disclosure 263,125,000 265,938,000    
Total Fair Value | 6.625% Senior Notes [Member]
       
Liabilities:        
Debt Instrument, Fair Value Disclosure 322,314,000 317,064,000    
Total Fair Value | 5.125% Senior Notes
       
Liabilities:        
Debt Instrument, Fair Value Disclosure 300,564,000 279,000,000    
Total Fair Value | Other non recourse debt including current portion [Member]
       
Liabilities:        
Non-recourse debt 62,721,000 62,319,000    
Level 1
       
Assets:        
Cash and cash equivalents 37,360,000 52,125,000    
Restricted cash 4,325,000 1,838,000    
Liabilities:        
Borrowings under senior credit facility 0 0    
Level 1 | 5.875% Senior Notes [Member]
       
Liabilities:        
Debt Instrument, Fair Value Disclosure 0 0    
Level 1 | 6.625% Senior Notes [Member]
       
Liabilities:        
Debt Instrument, Fair Value Disclosure 0 0    
Level 1 | 5.125% Senior Notes
       
Liabilities:        
Debt Instrument, Fair Value Disclosure 0 0    
Level 1 | Other non recourse debt including current portion [Member]
       
Liabilities:        
Non-recourse debt 0 0    
Level 2
       
Assets:        
Cash and cash equivalents 0 0    
Restricted cash 18,095,000 12,754,000    
Liabilities:        
Borrowings under senior credit facility 633,114,000 639,246,000    
Level 2 | 5.875% Senior Notes [Member]
       
Liabilities:        
Debt Instrument, Fair Value Disclosure 263,125,000 265,938,000    
Level 2 | 6.625% Senior Notes [Member]
       
Liabilities:        
Debt Instrument, Fair Value Disclosure 322,314,000 317,064,000    
Level 2 | 5.125% Senior Notes
       
Liabilities:        
Debt Instrument, Fair Value Disclosure 300,564,000 279,000,000    
Level 2 | Other non recourse debt including current portion [Member]
       
Liabilities:        
Non-recourse debt 62,721,000 62,319,000    
Level 3
       
Assets:        
Cash and cash equivalents 0 0    
Restricted cash 0 0    
Liabilities:        
Borrowings under senior credit facility 0 0    
Level 3 | 5.875% Senior Notes [Member]
       
Liabilities:        
Debt Instrument, Fair Value Disclosure 0 0    
Level 3 | 6.625% Senior Notes [Member]
       
Liabilities:        
Debt Instrument, Fair Value Disclosure 0 0    
Level 3 | 5.125% Senior Notes
       
Liabilities:        
Debt Instrument, Fair Value Disclosure 0 0    
Level 3 | Other non recourse debt including current portion [Member]
       
Liabilities:        
Non-recourse debt 0 0    
Australian subsidiary | Carrying Value
       
Liabilities:        
Non-recourse debt 22,197,000 23,896,000    
Australian subsidiary | Total Fair Value
       
Liabilities:        
Non-recourse debt 22,581,000 24,439,000    
Australian subsidiary | Level 1
       
Liabilities:        
Non-recourse debt 0 0    
Australian subsidiary | Level 2
       
Liabilities:        
Non-recourse debt 22,581,000 24,439,000    
Australian subsidiary | Level 3
       
Liabilities:        
Non-recourse debt $ 0 $ 0