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Other Long-Term Financial Liabilities (Tables)
 12 Months Ended
Dec. 31, 2020
Other Long-Term Financial Liabilities [Abstract]  
Impact of Failed Sale Leasebacks, Income Statement
During the twelve months ended December 31, the amounts recognized in the accompanying consolidated statements of income related to these "failed" sale-leasebacks were as follows (in thousands):
2020
Depreciation and amortization$766 
Interest expense651 
Schedule of Future Minimum Payments for Failed Sale Leasebacks
As of December 31, 2020, the future minimum lease payments under these agreements for the years ended December 31, were as follows (in thousands):
2021$2,568 
20222,568 
20232,568 
20242,568 
20252,568 
Years subsequent to 20252,803 
$15,643 
Schedule of Future Depreciation Expense for Failed Sale Leasebacks
As of December 31, 2020, depreciation expense to be recognized on these U.S.-flag harbor tugs through the end of the lease term for the years ended December 31, was as follows (in thousands):
2021$1,313 
20221,313 
20231,313 
20241,313 
20251,313 
Years subsequent to 20251,422 
$7,987