Leases - Future Minimum Commitments for Chartered-In Contracts (Table) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property Subject To Or Available For Operating Lease [Line Items]    
Operating lease liabilities, including current portion $ 43,516 $ 47,064
Charter-in contracts    
Property Subject To Or Available For Operating Lease [Line Items]    
December 31, 2021 100,690  
December 31, 2022 63,995  
December 31, 2023 54,148  
December 31, 2024 39,788  
December 31, 2025 19,076  
December 31, 2026 and thereafter 45,934  
Total 323,631  
Operating lease liabilities, including current portion 266,367  
Discount based on incremental borrowing rate 57,264  
Land leases    
Property Subject To Or Available For Operating Lease [Line Items]    
December 31, 2021 556  
December 31, 2022 556  
December 31, 2023 556  
December 31, 2024 556  
December 31, 2025 556  
December 31, 2026 and thereafter 22,446  
Total 25,226  
Operating lease liabilities, including current portion 7,878  
Discount based on incremental borrowing rate 17,348  
Office space    
Property Subject To Or Available For Operating Lease [Line Items]    
December 31, 2021 356  
December 31, 2022 101  
December 31, 2023 81  
December 31, 2024 0  
December 31, 2025 0  
December 31, 2026 and thereafter 0  
Total 538  
Operating lease liabilities, including current portion 519  
Discount based on incremental borrowing rate $ 19