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Short-Term and Long-Term Debt, Including Finance Leases - Long-term debt instruments (Details) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Credit Facility $ 209,000,000 $ 238,604,000
Finance lease and other obligations $ 148,000 $ 254,000
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] Liabilities, Current Liabilities, Current
Total long-term debt and finance leases $ 209,148,000 $ 238,858,000
Less: portion of Credit Facility classified as short term (14,813,000) (27,048,000)
Less: current installments of finance leases and other obligations (86,000) (82,000)
Total long-term debt and finance leases, less current installments 194,335,000 211,810,000
Credit Facility    
Debt Instrument [Line Items]    
Less: portion of Credit Facility classified as short term $ (14,727,000) $ (26,966,000)