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Accounting For Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Deferred income tax assets: |  |
Regulatory liabilities | $ 200,513 | $ 179,871
Tax credits and NOL carryforwards | 64,994 | 57,516
Provisions for pensions | 25,650 | 37,501
Other | 38,181 | 42,641
Total gross deferred income tax assets | 329,338 | 317,529
Valuation allowances for deferred tax assets | (9,626) | (10,021)
Total deferred income tax assets after valuation allowances | 319,712 | 307,508
Deferred income tax liabilities: |  |
Utility property, plant, and equipment | 688,856 | 666,639
Regulatory assets | 264,978 | 232,697
Other | 8,587 | 2,884
Total deferred income tax liabilities | 962,421 | 902,220
Net long-term deferred income tax liability | $ 642,709 | $ 594,712

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