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Financial Instruments - Estimated Fair Values Of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Total    
Financial Instruments    
Cash and cash equivalents $ 319,573 $ 129,410
Restricted cash 13,000 346
Equity participation ZIM 268,595 423,024
Secured long-term debt, including current portion 585,149 842,035
Unsecured long-term debt 297,885 300,000
Book Value    
Financial Instruments    
Cash and cash equivalents 319,573 129,410
Restricted cash 13,000 346
Equity participation ZIM 268,595 423,024
Secured long-term debt, including current portion 585,149 842,035
Unsecured long-term debt $ 300,000 $ 300,000