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10-K Income Taxes - Net deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets:    
Accrued pension costs $ 11,070 $ 15,011
Operating Lease Liabilities 11,804 12,966
Asset retirement obligations 9,687 8,696
Deferred compensation/ compensation related 15,329 14,654
Net operating loss/ credit carryforward 12,039 11,329
Capitalized inventory overloads 7,260 4,683
Payroll tax deferral 0 2,329
Other 8,412 8,032
Total deferred tax assets 75,601 77,700
Deferred tax liabilities:    
Basic differences on property, plant, and equipment 203,099 199,928
Operating lease right-of-use assets 11,804 12,966
Intangible assets 10,975 9,760
Other 13,488 12,243
Total deferred tax liabilities 239,366 234,897
Valuation allowance 12,039 11,329
Net deferred income tax liability $ (175,804) $ (168,526)