Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation, Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Narrative) (Details)

v3.21.2
Basis of Presentation, Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2021
Apr. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Sale proceeds of services     $ 34,348 $ 1,942 $ 57,545 $ 4,328  
Federal and state statutory rate         21.00%    
Deferred income tax liability $ 41,491   41,491   $ 41,491  
Derivative Assets Acquired [Member]              
Deferred income tax liability 18,800   18,800   18,800    
Fixed Assets and Non-deductible Intangible assets [Member]              
Deferred income tax liability 19,000   $ 19,000   19,000    
Power [Member] | TXU Power Supply Agreement [Member]              
Sale proceeds of services   $ 125,100          
Future Power Bills [Member] | TXU Power Supply Agreement [Member] | Beginning in 2022 [Member]              
Cash proceeds from services   59,700          
ERCOT [Member] | Electricity [Member]              
Sale proceeds of services $ 1,000            
ERCOT [Member] | Power [Member] | TXU Power Supply Agreement [Member]              
Contingent sale proceeds against future remittance         $ 26,300    
Whinstone [Member] | Power [Member] | TXU Power Supply Agreement [Member]              
Cash proceeds from services   29,000          
Power management fees   $ 10,000