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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Taxes |
Schedule of components of provision (benefit) for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Years ended December 31, |  | 2019 |  | 2018 |  | 2017
(in thousands) | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Current provision (benefit): | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Federal | ​ | $ | (3,548) | ​ | $ | 13,708 | ​ | $ | 95,995
State | ​ |  | (3,185) | ​ |  | 3,932 | ​ |  | 13,966
Foreign | ​ |  | 2,968 | ​ |  | 6,843 | ​ |  | 2,953
Deferred provision (benefit): | ​ |  |  | ​ |  |  | ​ |  |
Federal | ​ |  | (26,493) | ​ |  | 23,203 | ​ |  | (39,710)
State | ​ |  | 4,268 | ​ |  | (1,808) | ​ |  | (2,899)
Total income tax (benefit) provision | ​ | $ | (25,990) | ​ | $ | 45,878 | ​ | $ | 70,305
Schedule of reconciliation between the federal statutory rate and effective tax rate | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Years ended December 31, |  | 2019 |  | 2018 |  | 2017 |
Federal statutory rate | ​ | 21.0 | % | 21.0 | % | 35.0 | %
State income taxes, net of federal benefit | ​ | (0.3) | ​ | 2.6 | ​ | 1.9 |
Tax credits |  | 0.3 |  | (0.1) |  | (0.7) | ​
Non-deductible expenses |  | (1.9) |  | 1.8 |  | 2.0 | ​
Adjustments related to the Act |  | — |  | (2.3) |  | (8.3) | ​
Adjustments related to vesting of restricted stock |  | (0.4) |  | (0.8) |  | (1.2) | ​
Other |  | 4.3 |  | (1.5) |  | 1.5 | ​
Effective tax rate |  | 23.0 | % | 20.7 | % | 30.2 | %
Schedule of deferred tax assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, |  | 2019 |  | 2018
(in thousands) | ​ |  | ​ | ​ |  | ​
Deferred tax assets: |  | ​ |  |  | ​ |
Self-insurance | ​ | $ | 5,729 | ​ | $ | 5,055
Pension | ​ |  | 9,617 | ​ |  | 7,261
State net operating loss carryforwards | ​ |  | 1,445 | ​ |  | 1,663
Bad debt | ​ |  | 1,392 | ​ |  | 1,291
Stock-based compensation | ​ |  | 3,358 | ​ |  | 3,501
Inventory reserve | ​ | ​ | 2,478 | ​ | ​ | 2,447
Impairment reserve | ​ | ​ | 2,802 | ​ | ​ | —
Foreign tax credit carryforwards | ​ |  | 3,086 | ​ |  | —
Federal net operating loss carryforwards | ​ | ​ | 19,664 | ​ | ​ | —
Basis differences in consolidated limited liability company | ​ | ​ | 5,778 | ​ | ​ | —
All others | ​ |  | 2,191 | ​ |  | 1,690
Gross deferred tax assets | ​ |  | 57,540 | ​ |  | 22,908
Deferred tax liabilities: | ​ |  | ​ | ​ |  |
Depreciation | ​ |  | (87,647) | ​ |  | (71,647)
Goodwill amortization | ​ |  | (6,763) | ​ |  | (6,587)
Basis differences in consolidated limited liability company | ​ |  | — | ​ |  | (4,636)
Basis differences in joint ventures | ​ |  | (444) | ​ |  | (408)
All others | ​ |  | (5) | ​ |  | (5)
Gross deferred tax liabilities | ​ |  | (94,859) | ​ |  | (83,283)
Net deferred tax liabilities | ​ | $ | (37,319) | ​ | $ | (60,375)
Schedule of reconciliation of unrecognized tax benefits | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018
Balance at January 1 | ​ | $ | 2,215,000 | ​ | $ | 2,215,000
Additions based on tax positions related to the current year |  | ​ | — |  | ​ | —
Additions for tax positions of prior years |  | ​ | — |  | ​ | —
Reductions for tax positions of prior years |  | ​ | — |  | ​ | —
Balance at December 31 | ​ | $ | 2,215,000 | ​ | $ | 2,215,000

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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