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Fair Value of Assets and Liabilities - Carrying Values and Fair Values (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Assets:      
Cash and cash equivalents $ 21,561 $ 31,255 $ 65,451
Estimate of Fair Value Measurement      
Assets:      
Cash and cash equivalents 21,561 31,255  
Restricted cash and investments 57,993 53,217  
Liabilities:      
Borrowings under senior credit facility 1,206,589 1,188,196  
Non-recourse debt 339,188 348,274  
Estimate of Fair Value Measurement | 5.875% Senior Notes due 2022      
Liabilities:      
Senior notes 247,275 244,550  
Estimate of Fair Value Measurement | 5.125% Senior Notes due 2023      
Liabilities:      
Senior notes 269,220 271,992  
Estimate of Fair Value Measurement | 5.875% Senior Notes due 2024      
Liabilities:      
Senior notes 221,240 224,590  
Estimate of Fair Value Measurement | 6.00% Senior Notes due 2026      
Liabilities:      
Senior notes 305,620 310,177  
Estimate of Fair Value Measurement | Level 1      
Assets:      
Cash and cash equivalents 21,561 31,255  
Restricted cash and investments 57,993 50,499  
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 2022      
Liabilities:      
Senior notes 0 0  
Estimate of Fair Value Measurement | Level 1 | 5.125% Senior Notes due 2023      
Liabilities:      
Senior notes 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 | 6.00% Senior Notes due 2026      
Liabilities:      
Senior notes 0 0  
Estimate of Fair Value Measurement | Level 2      
Assets:      
Cash and cash equivalents 0 0  
Restricted cash and investments 0 2,718  
Liabilities:      
Borrowings under senior credit facility 1,206,589 1,188,196  
Non-recourse debt 339,188 348,274  
Estimate of Fair Value Measurement | Level 2 | 5.875% Senior Notes due 2022      
Liabilities:      
Senior notes 247,275 244,550  
Estimate of Fair Value Measurement | Level 2 | 5.125% Senior Notes due 2023      
Liabilities:      
Senior notes 269,220 271,992  
Estimate of Fair Value Measurement | Level 2 | 5.875% Senior Notes due 2024      
Liabilities:      
Senior notes 221,240 224,590  
Estimate of Fair Value Measurement | Level 2 | 6.00% Senior Notes due 2026      
Liabilities:      
Senior notes 305,620 310,177  
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 2022      
Liabilities:      
Senior notes 0 0  
Estimate of Fair Value Measurement | Level 3 | 5.125% Senior Notes due 2023      
Liabilities:      
Senior notes 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 | 6.00% Senior Notes due 2026      
Liabilities:      
Senior notes 0 0  
Carrying Value      
Assets:      
Cash and cash equivalents 21,561 31,255  
Restricted cash and investments 57,993 53,217  
Liabilities:      
Borrowings under senior credit facility 1,231,322 1,273,965  
Non-recourse debt 342,233 340,910  
Carrying Value | 5.875% Senior Notes due 2022      
Liabilities:      
Senior notes 250,000 250,000  
Carrying Value | 5.125% Senior Notes due 2023      
Liabilities:      
Senior notes 300,000 300,000  
Carrying Value | 5.875% Senior Notes due 2024      
Liabilities:      
Senior notes 250,000 250,000  
Carrying Value | 6.00% Senior Notes due 2026      
Liabilities:      
Senior notes $ 350,000 $ 350,000