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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2022
Income Taxes |
Schedule of Components of Income Tax Expense (Benefit) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(amounts in thousands) |  | 2022 |  | 2021 |  | 2020
Current: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | $ | 28,536 | ​ | $ | 20,771 | ​ | $ | 29,121
State | ​ | ​ | 7,896 | ​ | ​ | 6,374 | ​ | ​ | 9,984
Deferred: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | ​ | 3,191 | ​ | ​ | 8,074 | ​ | ​ | 4,090
State | ​ | ​ | (4,042) | ​ | ​ | 4,239 | ​ | ​ | 1,567
Total | ​ | $ | 35,581 | ​ | $ | 39,458 | ​ | $ | 44,762
​
Schedule of Effective Income Tax Rate Reconciliation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(amounts in thousands) |  | 2022 |  | 2021 |  | 2020
Income taxes at federal statutory rate | ​ | $ | 33,763 | ​ | $ | 31,144 | ​ | $ | 34,373
State income taxes, net of federal income tax benefit | ​ | ​ | 4,700 | ​ | ​ | 6,207 | ​ | ​ | 7,261
Nondeductible employee-related expenses | ​ | ​ | 2,235 | ​ | ​ | 2,530 | ​ | ​ | 2,223
State deferred rate change | ​ | ​ | (5,462) | ​ | ​ | — | ​ | ​ | -
Other | ​ | ​ | 345 | ​ | ​ | (423) | ​ | ​ | 905
Provision for income taxes | ​ | $ | 35,581 | ​ | $ | 39,458 | ​ | $ | 44,762
​
Schedule of Deferred Tax Assets and Liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(amounts in thousands) |  | 2022 |  | 2021
Deferred tax assets: | ​ | ​ | ​ | ​ | ​ | ​
Accounts receivable | ​ | $ | 1,195 | ​ | $ | 951
Employment incentives | ​ | ​ | 6,329 | ​ | ​ | 6,886
Self-insurance liability | ​ | ​ | 8,717 | ​ | ​ | 9,324
Postretirement benefit obligations | ​ | ​ | 5,963 | ​ | ​ | 7,412
Net operating loss and credit carryforwards | ​ | ​ | 5,009 | ​ | ​ | 6,202
Unrecognized tax benefits | ​ | ​ | 2,869 | ​ | ​ | 2,108
Other | ​ | ​ | 1,101 | ​ | ​ | 1,830
Total deferred tax assets | ​ | ​ | 31,183 | ​ | ​ | 34,713
Deferred tax liabilities: | ​ | ​ | ​ | ​ | ​ | ​
Inventories | ​ | ​ | (13,398) | ​ | ​ | (16,038)
Unrealized gains on marketable securities | ​ | ​ | 1,280 | ​ | ​ | (2,177)
Prepaids | ​ | ​ | (5,570) | ​ | ​ | (6,365)
Depreciation | ​ | ​ | (124,720) | ​ | ​ | (125,220)
Total deferred tax liabilities | ​ | ​ | (142,408) | ​ | ​ | (149,800)
Net deferred tax liability | ​ | $ | (111,225) | ​ | $ | (115,087)
​
Schedule of Unrecognized Tax Benefits | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(amounts in thousands) |  | 2022 |  | 2021
Unrecognized tax benefits at beginning of year | ​ | $ | 10,036 | ​ | $ | 8,337
Increases based on tax positions related to the current year | ​ | ​ | 2,376 | ​ | ​ | 1,699
Additions for tax positions of prior year | ​ | ​ | 1,249 | ​ | ​ | —
Reductions for tax positions of prior years | ​ | ​ | — | ​ | ​ | —
Settlements | ​ | ​ | — | ​ | ​ | —
Expiration of the statute of limitations for assessment of taxes | ​ | ​ | — | ​ | ​ | —
Unrecognized tax benefits at end of year | ​ | $ | 13,661 | ​ | $ | 10,036
​

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