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Derivative Instruments - Power Purchase Agreements (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2019
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2019
agreement
Derivative [Line Items]              
Increase (decrease) in utilities expense   $ 200 $ 400 $ 100 $ 800    
Power Purchase Agreements              
Derivative [Line Items]              
Number of agreements | agreement             2
Term of agreement 10 years            
Cash flow hedging | Power Purchase Agreements              
Derivative [Line Items]              
Fair value   (622)   (622)   $ (3,926)  
Cash flow hedging | Piscataway | Calpine Energy Solutions, LLC              
Derivative [Line Items]              
Fair value   (1,118)   (1,118)   (2,162)  
Cash flow hedging | Chicago | Calpine Energy Solutions, LLC              
Derivative [Line Items]              
Fair value   $ 496   $ 496      
Fair value           $ (1,764)