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Fair Value of Assets and Liabilities - Carrying Values and Fair Values (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Assets:      
Cash and cash equivalents $ 67,728 $ 31,255 $ 49,235
Carrying Value      
Assets:      
Cash and cash equivalents 67,728 31,255  
Restricted cash and investments 56,077 53,217  
Liabilities:      
Borrowings under senior credit facility 1,311,175 1,273,965  
Non-recourse debt 341,196 340,910  
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 67,728 31,255  
Restricted cash and investments 56,077 53,217  
Liabilities:      
Borrowings under senior credit facility 1,252,400 1,188,196  
Non-recourse debt 341,595 348,274  
Estimate of Fair Value Measurement | 5.875% Senior Notes due 2024      
Liabilities:      
Senior notes 219,278 224,590  
Estimate of Fair Value Measurement | 5.125% Senior Notes      
Liabilities:      
Senior notes 266,034 271,992  
Estimate of Fair Value Measurement | 5.875% Senior Notes due 2022      
Liabilities:      
Senior notes 242,853 244,550  
Estimate of Fair Value Measurement | 6.00% Senior Notes      
Liabilities:      
Senior notes 294,914 310,177  
Estimate of Fair Value Measurement | Level 1      
Assets:      
Cash and cash equivalents 67,728 31,255  
Restricted cash and investments 53,148 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 2,929 2,284  
Liabilities:      
Borrowings under senior credit facility 1,252,400 1,188,196  
Non-recourse debt 341,595 348,274  
Estimate of Fair Value Measurement | Level 2 | 5.875% Senior Notes due 2024      
Liabilities:      
Senior notes 219,278 224,590  
Estimate of Fair Value Measurement | Level 2 | 5.125% Senior Notes      
Liabilities:      
Senior notes 266,034 271,992  
Estimate of Fair Value Measurement | Level 2 | 5.875% Senior Notes due 2022      
Liabilities:      
Senior notes 242,853 244,550  
Estimate of Fair Value Measurement | Level 2 | 6.00% Senior Notes      
Liabilities:      
Senior notes 294,914 310,177  
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