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Derivatives - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Derivative [Line Items]        
Cash collateral for the derivative contracts $ 100,000   $ 100,000  
Net receipts on settlement of derivative instruments     19,637,000 $ 1,638,000
Realized gain (8,560,000) $ 0 178,000 0
Gain (loss) transferred from accumulated other comprehensive income (loss) $ 0 $ 0 0 $ 0
NOK and EUR FX forwards        
Derivative [Line Items]        
Net receipts on settlement of derivative instruments     28,200,000  
Realized gain     8,700,000  
Interest Rate Swap | Designated        
Derivative [Line Items]        
Loss on derivative     $ 34,000,000.0