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v3.22.4

Components of deferred tax assets and liabilities (Details 3) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred tax assets: |  |
Postretirement | $ 41,298 | $ 45,752
Compensation-related | 35,196 | 37,917
Operating lease liabilities | 25,718 | 26,710
Asset retirement obligations | 9,687 | 8,696
Legal and environmental contingencies | 8,526 | 8,603
Customer advances | 7,615 | 7,683
Payroll tax deferral | 0 | 6,940
Other | 51,472 | 39,960
Total deferred tax assets | 179,512 | 182,261
Deferred tax liabilities: |  |
Basis differences on property, plant and equipment | 608,528 | 585,095
Postretirement | 47,340 | 48,302
Purchased gas adjustment | 33,567 | 21,136
Operating lease right-of-use-assets | 25,472 | 26,570
Intangible assets | 23,007 | 21,074
Other | 60,078 | 59,934
Total deferred tax liabilities | 797,992 | 762,111
Valuation allowance | 12,823 | 12,112
Net deferred income tax liability | $ 631,303 | $ 591,962

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