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DEBT - Non-Recourse Flexiti SPE Facility (Details)
$ in Thousands, $ in Millions
Sep. 30, 2021
USD ($)
Mar. 31, 2021
CAD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]      
Debt $ 1,131,998   $ 819,661
Revolving Credit Facility | Non-Recourse Flexiti SPE Facility | Line of Credit      
Debt Instrument [Line Items]      
Debt 255,704   $ 0
Deferred financing costs $ 4,200    
Revolving Credit Facility | Non-Recourse Flexiti SPE Facility | Line of Credit | Minimum      
Debt Instrument [Line Items]      
Commitment fee on unused portion 0.50%    
Revolving Credit Facility | Non-Recourse Flexiti SPE Facility | Line of Credit | Maximum      
Debt Instrument [Line Items]      
Commitment fee on unused portion 1.00%    
Revolving Credit Facility | Non-Recourse Flexiti SPE Facility | Line of Credit | Class A Borrowings      
Debt Instrument [Line Items]      
Line of credit facility, borrowing capacity   $ 500.0  
Revolving Credit Facility | Non-Recourse Flexiti SPE Facility | Line of Credit | Canadian Dollar Offered Rate (CDOR)      
Debt Instrument [Line Items]      
Basis spread 4.40%