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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2021

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
						2021						2020						2019
						(thousands)
Domestic						$	945,562					$	284,147					$	105,341
Foreign						3,289						2,164						2,890
Income before income taxes						$	948,851					$	286,311					$	108,231

Income Tax Provision [Table Text Block]

The income tax provision shown in the Consolidated Statements of Operations includes the following:

						Year Ended December 31
						2021						2020						2019
						(thousands)
Current income tax provision
Federal						$	201,725					$	66,401					$	13,700
State						48,332						17,434						4,574
Foreign						12						—						7
Total current						250,069						83,835						18,281
Deferred income tax provision (benefit)
Federal						(12,149)						22,321						7,430
State						(2,484)						4,529						925
Foreign						929						647						670
Total deferred						(13,704)						27,497						9,025
Income tax provision						$	236,365					$	111,332					$	27,306

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
						2021						2020						2019
						(thousands, except percentages)
Income before income taxes						$	948,851					$	286,311					$	108,231
Statutory U.S. income tax rate						21.0		%				21.0		%				21.0		%
Statutory tax provision						$	199,259					$	60,125					$	22,728
State taxes						35,705						12,267						4,390
Stranded tax effects of Plan Termination (a)						—						38,794						—
Unrecognized tax benefits						2						87						(178)
Tax credits						(620)						(712)						(725)
Foreign rate differential						236						65						71
Share-based compensation						(563)						(411)						(532)
Nondeductible executive compensation						1,664						808						852
Meals and entertainment						336						340						738
Other						346						(31)						(38)
Total						$	236,365					$	111,332					$	27,306
Effective income tax rate						24.9		%				38.9		%				25.2		%

______________________________________ 

(a)    In December 2020, we eliminated our qualified defined benefit pension plan (Plan Termination), as discussed in Note 11, 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.

Net Deferred Tax Assets and Liabilities [Table Text Block]

The components of our net deferred tax assets and liabilities at December 31, 2021 and 2020, are summarized as follows:

						December 31, 2021						December 31, 2020
						(thousands)
Deferred tax assets
Employee benefits						$	28,534					$	29,258
Lease liabilities						24,956						25,057
Inventories						4,100						3,711
Foreign net operating loss carryforward						1,685						1,279
Other						7,170						6,921
Deferred tax assets						$	66,445					$	66,226
Deferred tax liabilities
Property and equipment						$	(32,040)					$	(45,652)
Right-of-use assets						(22,950)						(23,256)
Intangible assets and other						(6,850)						(6,823)
Other						(1,657)						(1,298)
Deferred tax liabilities						$	(63,497)					$	(77,029)
Total deferred tax assets (liabilities), net						$	2,948					$	(10,803)

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:

						2021						2020						2019
						(thousands)
Balance as of January 1						$	1,780					$	1,685					$	1,850
Increases related to prior years' tax positions						—						97						—
Increases related to current years' tax positions						28						89						53
Decreases related to prior years' tax positions						(19)						—						—
Lapse of statute of limitations						(7)						(91)						(218)
Balance as of December 31						$	1,782					$	1,780					$	1,685

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