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Regulatory Matters (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Regulatory assets    
Regulatory assets $ 702,368 $ 796,599
Less current regulatory assets (267,725) (270,290)
Regulatory assets, non-current 434,643 526,309
Regulatory liabilities    
Regulatory liabilities 515,998 502,951
Less current regulatory liabilities (33,356) (17,574)
Regulatory liabilities, non-current 482,642 485,377
Deferred energy and gas costs    
Regulatory liabilities    
Regulatory liabilities 15,899 6,113
Employee benefit plans and related deferred taxes    
Regulatory liabilities    
Regulatory liabilities 31,330 32,241
Cost of removal    
Regulatory liabilities    
Regulatory liabilities 184,111 179,976
Excess deferred income taxes    
Regulatory liabilities    
Regulatory liabilities 259,674 264,042
Other regulatory liabilities    
Regulatory liabilities    
Regulatory liabilities 24,984 20,579
Winter Storm Uri Incremental Costs in a Separately Tracked Mechanism    
Regulatory assets    
Regulatory assets 402,971 509,025
Deferred energy and gas costs    
Regulatory assets    
Regulatory assets 71,701 59,973
Deferred gas cost adjustments    
Regulatory assets    
Regulatory assets 8,083 9,488
Gas price derivatives    
Regulatory assets    
Regulatory assets 4,845 2,584
Deferred taxes on AFUDC    
Regulatory assets    
Regulatory assets 7,426 7,457
Employee benefit plans and related deferred taxes    
Regulatory assets    
Regulatory assets 87,130 88,923
Environmental    
Regulatory assets    
Regulatory assets 1,360 1,385
Loss on reacquired debt    
Regulatory assets    
Regulatory assets 20,112 21,011
Deferred taxes on flow through accounting    
Regulatory assets    
Regulatory assets 69,811 63,243
Decommissioning costs    
Regulatory assets    
Regulatory assets 4,717 5,961
Other regulatory assets    
Regulatory assets    
Regulatory assets $ 24,212 $ 27,549