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DEBT - Non-Recourse Notes (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Aug. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Apr. 30, 2014
Debt          
Payment of principal on non-recourse notes due 2029   $ 0 $ 0 $ 487,189  
Non-Recourse Notes | 2029 Notes          
Debt          
Interest added to the principal balance of non-recourse notes due 2029   $ 44,000      
Write-off of debt issuance costs $ 7,300        
Non-Recourse Notes | 2029 Notes | Private Placement          
Debt          
Non-Recourse Debt         $ 450,000
Interest rate (as a percent)         9.00%
Debt issuance costs         $ 15,300