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Regulatory Matters (Tables)
6 Months Ended
Jun. 30, 2021
Regulatory Assets and Liabilities Disclosure [Abstract]  
Schedule of Regulatory Assets and Liabilities
We had the following regulatory assets and liabilities (in thousands):
As ofAs of
June 30, 2021December 31, 2020
Regulatory assets
Winter Storm Uri (a)
$541,389 $— 
Deferred energy and fuel cost adjustments (b)
57,715 39,035 
Deferred gas cost adjustments (b)
676 3,200 
Gas price derivatives (b)
145 2,226 
Deferred taxes on AFUDC (c)
7,479 7,491 
Employee benefit plans and related deferred taxes (d)
116,003 116,598 
Environmental (b)
1,410 1,413 
Loss on reacquired debt (b)
21,914 22,864 
Deferred taxes on flow through accounting (d)
55,034 47,515 
Decommissioning costs (b)
7,205 8,988 
Gas supply contract termination (b)
— 2,524 
Other regulatory assets (b)
27,439 26,404 
Total regulatory assets836,409 278,258 
   Less current regulatory assets(218,628)(51,676)
Regulatory assets, non-current$617,781 $226,582 
Regulatory liabilities
Deferred energy and gas costs (b)
$28,261 $13,253 
Employee benefit plan costs and related deferred taxes (d)
39,542 40,256 
Cost of removal (b)
179,968 172,902 
Excess deferred income taxes (d)
268,604 285,259 
Other regulatory liabilities (d)
17,357 21,050 
Total regulatory liabilities533,732 532,720 
   Less current regulatory liabilities(36,124)(25,061)
Regulatory liabilities, non-current$497,608 $507,659 
__________
(a)    Timing of Winter Storm Uri incremental cost recovery and associated carrying costs are subject to pending applications with our utility commissions. See further information below.
(b)    Recovery of costs, but we are not allowed a rate of return.
(c)    In addition to recovery of costs, we are allowed a rate of return.
(d)    In addition to recovery or repayment of costs, we are allowed a return on a portion of this amount or a reduction in rate base.