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Fair Value Measurements And Disclosures - Financial Instruments Not Required to be Carried at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]      
Cash and cash equivalents, carrying amount $ 105,172 $ 83,376 $ 57,991
Finance receivables, net, carrying amount 3,460,804 3,295,008  
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]      
Interest-bearing deposits, carrying value 100,505 112,992  
Restricted Cash and Cash Equivalents 13,246   $ 1,092
Reported Value Measurement [Member]      
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]      
Cash and cash equivalents, carrying amount 105,172 83,376  
Finance receivables, net, carrying amount 3,460,804 3,295,008  
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]      
Interest-bearing deposits, carrying value 100,505 112,992  
Outstanding borrowings under credit facility 1,356,481 1,060,251  
Term loans, carrying amount 442,500 450,000  
Senior Notes, carrying amount 1,046,000 650,000  
Convertible debt 0 345,000  
Estimate of Fair Value Measurement [Member]      
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]      
Cash and cash equivalents, estimated fair value 105,172 83,376  
Finance receivables, net, estimated fair value 3,005,033 3,167,813  
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]      
Interest-bearing deposits, fair value 100,505 112,992  
Revolving lines of credit, estimated fair value 1,356,481 1,060,251  
Term loans, estimated fair value 442,500 450,000  
Debt Instrument, Fair Value Disclosure 923,125 580,433  
Convertible debt, estimated fair value $ 0 $ 341,926