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Accounting For Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred income tax assets: |  |
Regulatory liabilities | $ 179,871 | $ 181,455
Tax credits and NOL carryforwards | 57,516 | 22,331
Provisions for pensions | 37,501 | 41,648
Other | 42,641 | 36,542
Total gross deferred income tax assets | 317,529 | 281,976
Valuation allowances for deferred tax assets | (10,021) | (16,551)
Total deferred income tax assets after valuation allowances | 307,508 | 265,425
Deferred income tax liabilities: |  |
Utility property, plant, and equipment | 666,639 | 581,387
Regulatory assets | 232,697 | 210,231
Other | 2,884 | 2,320
Total deferred income tax liabilities | 902,220 | 793,938
Net long-term deferred income tax liability | $ 594,712 | $ 528,513

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