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Financial Instruments - Financial Instruments Measured and Not Measured At Fair Value On Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Financial Instruments    
Marketable securities $ 86,029  
Deferred finance costs, net 6,300 $ 8,100
Fair Value    
Financial Instruments    
Cash and cash equivalents 271,809 267,668
Amount invested 86,029  
Fair Value | Secured long-term debt, including current portion    
Financial Instruments    
Long-term debt 147,750 175,250
Fair Value | Unsecured long-term debt    
Financial Instruments    
Long-term debt 241,969 255,868
Recurring basis | (Level I)    
Financial Instruments    
Marketable securities 86,029  
Recurring basis | Fair Value    
Financial Instruments    
Marketable securities 86,029  
Non-recurring basis | (Level I)    
Financial Instruments    
Cash and cash equivalents 271,809 267,668
Non-recurring basis | (Level I) | Unsecured long-term debt    
Financial Instruments    
Long-term debt 241,969 255,868
Non-recurring basis | (Level II) | Secured long-term debt, including current portion    
Financial Instruments    
Long-term debt 147,750 175,250
Non-recurring basis | Fair Value    
Financial Instruments    
Cash and cash equivalents 271,809 267,668
Non-recurring basis | Fair Value | Secured long-term debt, including current portion    
Financial Instruments    
Long-term debt 147,750 175,250
Non-recurring basis | Fair Value | Unsecured long-term debt    
Financial Instruments    
Long-term debt $ 241,969 $ 255,868