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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2021
Regulated Operations [Abstract] |
Schedule of Regulatory Assets and Liabilities | We had the following regulatory assets and liabilities as of December 31 (in thousands):
| 2021 | 2020
Regulatory assets |  |
Winter Storm Uri (a) | $ | 509,025 |  | $ | — |
Deferred energy and fuel cost adjustments (b) | 59,973 |  | 39,035 |
Deferred gas cost adjustments (b) | 9,488 |  | 3,200 |
Gas price derivatives (b) | 2,584 |  | 2,226 |
Deferred taxes on AFUDC (b) | 7,457 |  | 7,491 |
Employee benefit plans and related deferred taxes (c) | 88,923 |  | 116,598 |
Environmental (b) | 1,385 |  | 1,413 |
Loss on reacquired debt (b) | 21,011 |  | 22,864 |
Deferred taxes on flow-through accounting (b) | 63,243 |  | 47,515 |
Decommissioning costs (b) | 5,961 |  | 8,988 |
Gas supply contract termination (b) | — |  | 2,524 |
Other regulatory assets (b) | 27,549 |  | 26,404 |
Total regulatory assets | 796,599 |  | 278,258 |
Less current regulatory assets | (270,290) |  | (51,676) |
Regulatory assets, non-current | $ | 526,309 |  | $ | 226,582 |
Regulatory liabilities |  |
Deferred energy and gas costs (b) | $ | 6,113 |  | $ | 13,253 |
Employee benefit plan costs and related deferred taxes (c) | 32,241 |  | 40,256 |
Cost of removal (b) | 179,976 |  | 172,902 |
Excess deferred income taxes (c) | 264,042 |  | 285,259 |
Other regulatory liabilities (c) | 20,579 |  | 21,050 |
Total regulatory liabilities | 502,951 |  | 532,720 |
Less current regulatory liabilities | (17,574) |  | (25,061) |
Regulatory liabilities, non-current | $ | 485,377 |  | $ | 507,659 |
_____________________ (a) Timing of Winter Storm Uri incremental cost recovery and associated carrying costs vary by jurisdiction and some jurisdictions are still subject to pending applications with the respective utility commission. See further information below. (b) Recovery of costs, but we are not allowed a rate of return. (c) 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.

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