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Fair Value of Financial Instruments - Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Fair Value Of Financial Instruments    
Cash and cash equivalents - Book Value $ 73,159 $ 94,881
Cash and cash equivalents - Fair Value 73,159 94,881
Restricted cash - Book Value 10 16,303
Restricted cash - Fair Value 10 16,303
Investments in available-for-sale-securities - Book Value 364 222
Investments in available-for-sale-securities - Fair Value 364 222
Senior and ship mortgage notes, net - Book Value (1,253,395) (1,263,566)
Senior and ship mortgage notes, net - Fair Value (1,269,481) (1,054,616)
Long-term debt, including current portion - Book Value (126,047) (191,636)
Long-term debt, including current portion - Fair Value (126,962) (193,043)
Loans payable to affiliate companies, including current portion - Book Value (96,404) (129,227)
Loans payable to affiliate companies, including current portion - Fair Value $ (96,404) $ (129,227)