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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Taxes |
Schedule of components of provision (benefit) for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Years ended December 31, |  | 2020 |  | 2019 |  | 2018
(in thousands) | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Current provision (benefit): | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Federal | ​ | $ | (74,841) | ​ | $ | (3,548) | ​ | $ | 13,708
State | ​ |  | 2,200 | ​ |  | (3,185) | ​ |  | 3,932
Foreign | ​ |  | 1,247 | ​ |  | 2,968 | ​ |  | 6,843
Deferred provision (benefit): | ​ |  | ​ | ​ |  |  | ​ |  |
Federal | ​ |  | (16,376) | ​ |  | (26,493) | ​ |  | 23,203
State | ​ |  | (9,469) | ​ |  | 4,268 | ​ |  | (1,808)
Total income tax (benefit) provision | ​ | $ | (97,239) | ​ | $ | (25,990) | ​ | $ | 45,878
Schedule of reconciliation between the federal statutory rate and effective tax rate | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Years ended December 31, |  | 2020 |  | 2019 |  | 2018 |
Federal statutory rate | ​ | 21.0 | % | 21.0 | % | 21.0 | %
State income taxes, net of federal benefit | ​ | 1.5 | ​ | (0.3) | ​ | 2.6 |
Tax credits |  | 0.1 |  | 0.3 |  | (0.1) | ​
Non-deductible expenses |  | (0.1) |  | (1.9) |  | 1.8 | ​
Adjustments related to CARES Act |  | 8.5 |  | — |  | — | ​
Adjustments related to the Act |  | — |  | — |  | (2.3) | ​
Adjustments related to vesting of restricted stock |  | (0.8) |  | (0.4) |  | (0.8) | ​
Other |  | 1.2 |  | 4.3 |  | (1.5) | ​
Effective tax rate |  | 31.4 | % | 23.0 | % | 20.7 | %
Schedule of deferred tax assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, |  | 2020 |  | 2019
(in thousands) | ​ |  | ​ | ​ |  | ​
Deferred tax assets: |  | ​ |  |  | ​ |
Self-insurance | ​ | $ | 4,773 | ​ | $ | 5,729
Pension | ​ |  | 8,105 | ​ |  | 9,617
State net operating loss carryforwards | ​ |  | 5,853 | ​ |  | 1,445
Bad debt | ​ |  | 1,302 | ​ |  | 1,392
Stock-based compensation | ​ |  | 2,291 | ​ |  | 3,358
Inventory reserve | ​ | ​ | 3,226 | ​ | ​ | 2,478
Impairment reserve | ​ | ​ | 338 | ​ | ​ | 2,802
Foreign tax credit carryforwards | ​ |  | — | ​ |  | 3,086
Federal net operating loss carryforwards | ​ | ​ | — | ​ | ​ | 19,664
Basis differences in consolidated limited liability company | ​ | ​ | 486 | ​ | ​ | 5,778
All others | ​ |  | 1,126 | ​ |  | 2,191
Gross deferred tax assets | ​ |  | 27,500 | ​ |  | 57,540
Deferred tax liabilities: | ​ |  | ​ | ​ |  | ​
Depreciation | ​ |  | (33,486) | ​ |  | (87,647)
Goodwill amortization | ​ |  | (6,893) | ​ |  | (6,763)
Basis differences in joint ventures | ​ |  | (448) | ​ |  | (444)
All others | ​ |  | (5) | ​ |  | (5)
Gross deferred tax liabilities | ​ |  | (40,832) | ​ |  | (94,859)
Net deferred tax liabilities | ​ | $ | (13,332) | ​ | $ | (37,319)
Schedule of reconciliation of unrecognized tax benefits | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019
Balance at January 1 | ​ | $ | 2,215,000 | ​ | $ | 2,215,000
Additions for tax positions of prior years |  | ​ | — |  | ​ | —
Reductions for tax positions of prior years |  | $ | (2,215,000) |  | ​ | —
Balance at December 31 | ​ | ​ | — | ​ | $ | 2,215,000

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