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Variable Interest Entity: (Details)
$ in Thousands
 12 Months Ended
Apr. 14, 2016
Dec. 31, 2021
USD ($)
MW
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Variable Interest Entity [Line Items]        
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 49.90%      
Net income attributable to non-controlling interest   $ (14,516) $ (15,155) $ (14,012)
Number of Days Following the End of the Quarter When Distributions of Net Income Attributable to this Non-controlling Interest are Due   30 days    
Current assets   $ 808,133 493,291  
Property, plant and equipment of variable interest entities, net   6,449,176 6,019,714  
Current liabilities   901,713 696,533  
Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Current assets   13,220 13,604  
Property, plant and equipment of variable interest entities, net   189,079 190,637  
Current liabilities   5,841 5,318  
Power Generation        
Variable Interest Entity [Line Items]        
Net income attributable to non-controlling interest   $ (15,000) $ (15,000) $ (14,000)
Pueblo Airport Generation | Subsidiary of Common Parent        
Variable Interest Entity [Line Items]        
Electric Generation Capacity, Megawatts | MW   200