Fair Value of Financial Instruments - Non-Recurring Measurements (Table) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash and cash equivalents $ 94,881 $ 77,991
Restricted cash 16,303 736
Investments in available-for-sale securities 222 189
Loan receivable from affiliate companies 0 24,495
Long-term receivable from affiliate company 0 5,328
Senior and ship mortgage notes 1,054,616 875,228
Long-term debt, including current portion (193,043) (264,498)
Loan payable to affiliate companies, including current portion (129,227) (130,538)
Long-term payable to affiliate companies 0 (5,000)
Fair Value, Measurements, Nonrecurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash and cash equivalents 94,881 77,991
Restricted cash 16,303 736
Investments in available-for-sale securities 222 189
Loan receivable from affiliate companies [1] 0 24,495
Long-term receivable from affiliate company 0 5,328
Senior and ship mortgage notes (1,054,616) (875,228)
Long-term debt, including current portion [2] (193,043) (264,498)
Loan payable to affiliate companies, including current portion (129,227) (130,538)
Long-term payable to affiliate companies 0 (5,000) [1]
(Level I) | Fair Value, Measurements, Nonrecurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash and cash equivalents 94,881 77,991
Restricted cash 16,303 736
Investments in available-for-sale securities 222 189
Senior and ship mortgage notes (1,045,990) (866,602)
(Level II) | Fair Value, Measurements, Nonrecurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loan receivable from affiliate companies [1] 0 24,495
Long-term receivable from affiliate company 0 5,328
Senior and ship mortgage notes (8,626) (8,626)
Long-term debt, including current portion [2] (193,043) (264,498)
Loan payable to affiliate companies, including current portion (129,227) (130,538)
Long-term payable to affiliate companies $ 0 $ (5,000) [1]
[1] The fair value of the Company’s loan receivable from/payable to affiliate companies and long-term receivable from/payable to affiliate companies is estimated based on currently available debt with similar contract terms, interest rate and remaining maturities as well as taking into account the counterparty’s creditworthiness.
[2] The fair value of the Company’s long-term debt is estimated based on currently available debt with similar contract terms, interest rates and remaining maturities, published quoted market prices as well as taking into account the Company’s creditworthiness.