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Derivative Instruments (Tables)
 9 Months Ended
Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of notional volume of natural gas derivatives that is expected to settle or mature each year The following table reflects the notional volume of our natural gas derivatives as of September 30, 2020 that is expected to settle or mature each year:
Year
 Natural Gas Swaps
(MMBTUs)
 (in millions)
20204.5 
202126.4 
202219.6 
202316.5 
202415.7 
202510.2 
Total92.9 
Schedule of fair value of derivative instruments and effect on consolidated balance sheets
The table below reflects the fair value of derivative instruments and their effect on our consolidated balance sheets at September 30, 2020 and December 31, 2019.
 Balance Sheet
Location
Fair Value
 20202019
 (dollars in thousands)
Assets:   
Natural gas swapsOther current assets$2,596 $— 
Liabilities:   
Natural gas swapsOther current liabilities$106 $12,898 
Natural gas swapsOther deferred credits$7,298 $19,358 
Schedule of the realized gains and (losses) on derivative instruments recognized in margin
The following table presents the gross realized gains and (losses) on derivative instruments recognized in net margins for the three and nine months ended September 30, 2020 and 2019.
Statement of
Revenues and
Expenses
Location		Three Months Ended
September 30,		Nine Months Ended
September 30,
 2020201920202019
 (dollars in thousands)
Natural Gas Swaps gainsFuel$339 $— $339 $224 
Natural Gas Swaps lossesFuel(8,721)(6,294)(20,314)(8,093)
Total $(8,382)$(6,294)$(19,975)$(7,869)
Schedule of unrealized losses on derivative instruments deferred on the balance sheet
The following table presents the unrealized losses on derivative instruments deferred on the balance sheet at September 30, 2020 and December 31, 2019.
Balance Sheet Location20202019
 (dollars in thousands)
Natural gas swapsRegulatory asset$4,808 $32,256 
Total $4,808 $32,256