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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2020
Income Tax Disclosure [Abstract]  
Income before Income Tax, Domestic and Foreign [Table Text Block] Income before income taxes includes the following components:
Year Ended December 31
202020192018
(thousands)
Domestic$284,147 $105,341 $21,704 
Foreign2,164 2,890 398 
Income before income taxes$286,311 $108,231 $22,102 
Income Tax Provision [Table Text Block] The income tax provision shown in the Consolidated Statements of Operations includes the following:
Year Ended December 31
202020192018
(thousands)
Current income tax provision
Federal$66,401 $13,700 $6,459 
State17,434 4,574 3,126 
Foreign— 
Total current83,835 18,281 9,590 
Deferred income tax provision (benefit)
Federal22,321 7,430 (5,987)
State4,529 925 (2,127)
Foreign647 670 149 
Total deferred27,497 9,025 (7,965)
Income tax provision$111,332 $27,306 $1,625 
Income Tax Rate Reconciliation [Table Text Block] The effective tax rate varies from the U.S. Federal statutory income tax rate principally due to the following:
Year Ended December 31
202020192018
(thousands, except percentages)
Income before income taxes$286,311 $108,231 $22,102 
Statutory U.S. income tax rate21.0 %21.0 %21.0 %
Statutory tax provision$60,125 $22,728 $4,642 
State taxes12,267 4,390 741 
Stranded tax effects of Plan Termination (a)38,794 — — 
Unrecognized tax benefits87 (178)(181)
Benefit from enactment of the Tax Act (b)— — (3,806)
Tax credits(712)(725)(272)
Foreign rate differential65 71 432 
Share-based compensation(411)(532)(1,718)
Nondeductible executive compensation808 852 366 
Meals and entertainment340 738 886 
Other(31)(38)535 
Total$111,332 $27,306 $1,625 
Effective income tax rate38.9 %25.2 %7.4 %
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(a)    In December 2020, we eliminated our qualified defined benefit pension plan (Plan Termination), as discussed in Note 12, Retirement and Benefit Plans. Prior to the Plan Termination, "Accumulated other comprehensive loss" on our Consolidated Balance Sheet included the stranded tax effects of our conversion from a limited liability company to a corporation in 2013 and the adoption of the Tax Cuts and Jobs Act (the "Tax Act") in 2017. Upon Plan Termination, these stranded tax effects of $38.8 million were required to be released into income tax expense under GAAP.

(b)    As of December 31, 2018, we completed our assessment of the effects of the Tax Act on our financial statements. In connection with our analysis of the Tax Act, we recorded a discrete tax benefit of $3.8 million during the year ended December 31, 2018. The $3.8 million reduction in income tax expense resulted from the remeasurement of deferred income taxes to the new federal statutory
rate of 21%, which mostly related to a $20.0 million discretionary pension contribution made during 2018, for which we received a tax deduction at the 2017 federal income tax rate of 35%.
Net Deferred Tax Assets and Liabilities [Table Text Block] The components of our net deferred tax assets and liabilities at December 31, 2020 and 2019, are summarized as follows:
December 31, 2020December 31, 2019
(thousands)
Deferred tax assets
Employee benefits$29,258 $26,914 
Lease liabilities25,057 23,241 
Inventories3,711 3,358 
Foreign net operating loss carryforward1,279 1,514 
Other6,921 6,256 
Deferred tax assets$66,226 $61,283 
Deferred tax liabilities
Property and equipment$(45,652)$(50,751)
Right-of-use assets(23,256)(21,753)
Intangible assets and other(6,823)(5,924)
Other(1,298)(1,597)
Deferred tax liabilities$(77,029)$(80,025)
Total deferred tax liabilities, net$(10,803)$(18,742)
Unrecognized Tax Benefits Roll Forward [Table Text Block] The following table summarizes the changes related to our gross unrecognized tax benefits excluding interest and penalties:
202020192018
(thousands)
Balance as of January 1$1,685 $1,850 $2,083 
Increases related to prior years' tax positions97 — 13 
Increases related to current years' tax positions89 53 — 
Decreases related to prior years' tax positions— — (43)
Lapse of statute of limitations(91)(218)(203)
Balance as of December 31$1,780 $1,685 $1,850