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Short-Term Borrowings - Reconciliation of liabilities to cash flows arising from financing activities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Short-Term Borrowings    
Beginning balance $ 369,300  
Change from financing activities:    
Ending Balance 453,000 $ 369,300
Unsecured Borrowings    
Short-Term Borrowings    
Beginning balance 0 0
Change from financing activities:    
Proceeds from borrowings 47,226 0
Repayments of borrowings (47,226) 0
Total changes from financing activities 0 0
Ending Balance 0 0
Secured Borrowings    
Short-Term Borrowings    
Beginning balance 369,300 151,400
Change from financing activities:    
Proceeds from borrowings 1,383,300 1,212,700
Repayments of borrowings (1,299,600) (994,800)
Total changes from financing activities 83,700 217,900
Ending Balance $ 453,000 $ 369,300