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Equity: Variable Interest Entities (Details)
$ in Thousands
3 Months Ended
Apr. 14, 2016
Jun. 30, 2018
USD ($)
MW
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 49.90%      
Current assets   $ 380,652 $ 570,782 $ 359,256
Property, plant and equipment of variable interest entities, net   5,702,065 5,567,518 5,423,160
Current liabilities   $ 730,635 649,101 438,865
Variable Interest Entity, Primary Beneficiary        
Electric Generation Capacity, Megawatts | MW   200    
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 49.90%      
Current assets   $ 11,462 14,837 12,042
Property, plant and equipment of variable interest entities, net   203,308 208,595 214,239
Current liabilities   $ 2,946 $ 4,565 $ 2,651