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Long-term Debt (Schedule of Long-term Debt Instruments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Senior unsecured bond $ 119,100 $ 119,100
Secured long-term debt 371,966 397,857
Total 491,066 516,957
Less: Deferred financing costs (5,170) (6,314)
Total 485,896 510,643
Less: Current long term debt, net of deferred financing costs, current (47,277) (49,512)
Long-term debt, excluding current maturities $ 438,619 $ 461,131