Annual report pursuant to Section 13 and 15(d)

Other Long-Term Financial Liabilities (Details)

v3.20.4
Other Long-Term Financial Liabilities (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
equipment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Other Long-Term Financial Liabilities [Line Items]      
Proceeds from other long-term financial liabilities | $ $ 33,662 $ 0 $ 0
Other Long-Term Liabilities, Imputed Interest Rate 3.35%    
Harbor Tugs - U.S.-flag      
Other Long-Term Financial Liabilities [Line Items]      
Equipment Subject to Failed Sale Leaseback, Number of Units | equipment 3    
Harbor Tugs - U.S.-flag | Minimum      
Other Long-Term Financial Liabilities [Line Items]      
Failed Sale Leaseback Transaction, Lease Terms 72    
Harbor Tugs - U.S.-flag | Maximum      
Other Long-Term Financial Liabilities [Line Items]      
Failed Sale Leaseback Transaction, Lease Terms 84