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Long-term debt (Schedule of Long-term Debt Instruments) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Long-term debt |  |
Senior unsecured bond | $ 119,100 | $ 125,000
Secured long-term debt | 423,749 | 405,120
Total long-term debt | 542,849 | 530,120
Less: Deferred financing costs | (7,526) | (7,609)
Long-term debt, net of deferred financing costs | 535,323 | 522,511
Less: Current portion of long-term debt, net of deferred financing, current | (49,428) | (91,495)
Long-term debt, excluding current maturities | $ 485,895 | $ 431,016

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