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Long-Term Borrowings- Reconciliation of liabilities to cash flows arising from financing activities (Details) - Long-term unsecured borrowings (including current portion) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Long-Term Borrowings    
Balance at beginning of year $ 40,500 $ 46,500
Change from financing activities:    
Proceeds from borrowings   0
Repayments of borrowings (6,000) (6,000)
Total changes from financing activities (6,000) (6,000)
Ending Balance $ 34,500 $ 40,500