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Fair Value of Assets and Liabilities - Carrying Values and Fair Values (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Assets:      
Cash and cash equivalents $ 49,235 $ 81,377 $ 434,559
Carrying Value      
Assets:      
Cash and cash equivalents 49,235 81,377  
Restricted cash and investments 60,014 52,168  
Liabilities:      
Borrowings under senior credit facility 1,122,155 1,064,599  
Non-recourse debt 382,647 393,737  
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 350,000 350,000  
Estimate of Fair Value Measurement      
Assets:      
Cash and cash equivalents 49,235 81,377  
Restricted cash and investments 60,014 52,168  
Liabilities:      
Borrowings under senior credit facility 1,122,155 1,070,514  
Non-recourse debt 383,462 394,671  
Estimate of Fair Value Measurement | 5.875% Senior Notes due 2024      
Liabilities:      
Senior notes 250,505 262,095  
Estimate of Fair Value Measurement | 5.125% Senior Notes      
Liabilities:      
Senior notes 297,888 303,918  
Estimate of Fair Value Measurement | 5.875% Senior Notes due 2022      
Liabilities:      
Senior notes 257,330 258,338  
Estimate of Fair Value Measurement | 6.00% Senior Notes      
Liabilities:      
Senior notes 344,467 362,835  
Estimate of Fair Value Measurement | Level 1      
Assets:      
Cash and cash equivalents 49,235 81,377  
Restricted cash and investments 57,289 49,884  
Liabilities:      
Borrowings under senior credit facility 0 0  
Non-recourse debt 0 0  
Estimate of Fair Value Measurement | Level 1 | 5.875% Senior Notes due 2024      
Liabilities:      
Senior notes 0 0  
Estimate of Fair Value Measurement | Level 1 | 5.125% Senior Notes      
Liabilities:      
Senior notes 0 0  
Estimate of Fair Value Measurement | Level 1 | 5.875% Senior Notes due 2022      
Liabilities:      
Senior notes 0 0  
Estimate of Fair Value Measurement | Level 1 | 6.00% Senior Notes      
Liabilities:      
Senior notes 0 0  
Estimate of Fair Value Measurement | Level 2      
Assets:      
Cash and cash equivalents 0 0  
Restricted cash and investments 2,725 2,284  
Liabilities:      
Borrowings under senior credit facility 1,122,155 1,070,514  
Non-recourse debt 383,462 394,671  
Estimate of Fair Value Measurement | Level 2 | 5.875% Senior Notes due 2024      
Liabilities:      
Senior notes 250,505 262,095  
Estimate of Fair Value Measurement | Level 2 | 5.125% Senior Notes      
Liabilities:      
Senior notes 297,888 303,918  
Estimate of Fair Value Measurement | Level 2 | 5.875% Senior Notes due 2022      
Liabilities:      
Senior notes 257,330 258,338  
Estimate of Fair Value Measurement | Level 2 | 6.00% Senior Notes      
Liabilities:      
Senior notes 344,467 362,835  
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  
Non-recourse debt 0 0  
Estimate of Fair Value Measurement | Level 3 | 5.875% Senior Notes due 2024      
Liabilities:      
Senior notes 0 0  
Estimate of Fair Value Measurement | Level 3 | 5.125% Senior Notes      
Liabilities:      
Senior notes 0 0  
Estimate of Fair Value Measurement | Level 3 | 5.875% Senior Notes due 2022      
Liabilities:      
Senior notes 0 0  
Estimate of Fair Value Measurement | Level 3 | 6.00% Senior Notes      
Liabilities:      
Senior notes $ 0 $ 0