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Fair Value Measurements and Hedging - Fair value on a nonrecurring basis (Table) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment loss $ 3,411 $ 17,784 $ 0
Fair Value Measurements, Nonrecurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment loss 3,411 17,784  
Fair Value Measurements, Nonrecurring | Vessels, net      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment loss 3,411 16,178  
Fair Value Measurements, Nonrecurring | Held for sale      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment loss   1,606  
Fair Value Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Property, plant and equipment, Fair value 24,475 20,842  
Fair Value Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Vessels, net      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Property, plant and equipment, Fair value $ 24,475 14,893  
Fair Value Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Held for sale      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Property, plant and equipment, Fair value   $ 5,949