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Derivative Instruments - Foreign Currency Forward Contracts (Details)
€ in Thousands, kr in Thousands, $ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2019
NOK (kr)
Dec. 31, 2019
EUR (€)
Foreign currency forward contracts      
Derivative [Line Items]      
Fair Value / Carrying Amount of Asset/(Liability) Non-hedge $ 575    
Expected Maturity - 2020 $ 57,130    
Norwegian Krone      
Derivative [Line Items]      
Notational amount | kr   kr 457,205  
Average Forward Rate 8.87 8.87 8.87
Norwegian Krone | Foreign currency forward contracts      
Derivative [Line Items]      
Fair Value / Carrying Amount of Asset/(Liability) Non-hedge $ 518    
Expected Maturity - 2020 $ 51,567    
Euro      
Derivative [Line Items]      
Notational amount | €     € 5,000
Average Forward Rate 0.90 0.90 0.90
Euro | Foreign currency forward contracts      
Derivative [Line Items]      
Fair Value / Carrying Amount of Asset/(Liability) Non-hedge $ 57    
Expected Maturity - 2020 $ 5,563