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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
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
|  | 2018 |  | 2017 |  | 2016
|  | (thousands)
Domestic |  | $ | 21,704 |  |  | $ | 115,083 |  |  | $ | 41,703 |
Foreign |  | 398 |  |  | 2,505 |  |  | 1,598 |
Income before income taxes |  | $ | 22,102 |  |  | $ | 117,588 |  |  | $ | 43,301 |
Income Tax Provision (Benefit) [Table Text Block] | The income tax provision shown in the Consolidated Statements of Operations includes the following:
|  | Year Ended December 31
|  | 2018 |  | 2017 |  | 2016
|  | (thousands)
Current income tax provision (benefit) |  |  |  |  |  |
Federal |  | $ | 6,459 |  |  | $ | 22,541 |  |  | $ | 10,664 |
State |  | 3,126 |  |  | 3,973 |  |  | 2,201 |
Foreign |  | 5 |  |  | — |  |  | 5 |
Total current |  | 9,590 |  |  | 26,514 |  |  | 12,870 |
Deferred income tax provision (benefit) |  |  |  |  |  |
Federal |  | (5,987 | ) |  | 6,747 |  |  | 2,549 |
State |  | (2,127 | ) |  | 991 |  |  | (1,536 | )
Foreign |  | 149 |  |  | 379 |  |  | (8,836 | )
Total deferred |  | (7,965 | ) |  | 8,117 |  |  | (7,823 | )
Income tax provision |  | $ | 1,625 |  |  | $ | 34,631 |  |  | $ | 5,047 |
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
|  | 2018 |  | 2017 |  | 2016
|  | (thousands, except percentages)
Income before income taxes |  | $ | 22,102 |  |  | $ | 117,588 |  |  | $ | 43,301 |
Statutory U.S. income tax rate |  | 21.0 | % |  | 35.0 | % |  | 35.0 | %
Statutory tax provision |  | $ | 4,642 |  |  | $ | 41,156 |  |  | $ | 15,155 |
State taxes |  | 741 |  |  | 3,719 |  |  | 1,370 |
Domestic production activities deduction |  | — |  |  | (963 | ) |  | (165 | )
Unrecognized tax benefits |  | (181 | ) |  | (86 | ) |  | 1,717 |
Benefit from enactment of the Tax Act |  | (3,806 | ) |  | (8,129 | ) |  | — |
Change in valuation allowance (a) |  | — |  |  | — |  |  | (9,884 | )
Tax credits |  | (272 | ) |  | (912 | ) |  | (2,904 | )
Foreign rate differential |  | 432 |  |  | (366 | ) |  | (91 | )
Share-based compensation |  | (1,718 | ) |  | (413 | ) |  | 107 |
Nondeductible executive compensation |  | 366 |  |  | — |  |  | — |
Meals and entertainment |  | 886 |  |  | 663 |  |  | 601 |
Other |  | 535 |  |  | (38 | ) |  | (859 | )
Total |  | $ | 1,625 |  |  | $ | 34,631 |  |  | $ | 5,047 |
Effective income tax rate |  | 7.4 | % |  | 29.5 | % |  | 11.7 | %
______________________________________
(a) | Deferred tax assets in our foreign subsidiaries are primarily the result of net operating losses. As of each reporting date, management considers new evidence, both positive and negative, that could affect its view of the future realization of deferred tax assets. During fourth quarter 2016, because we achieved three years of cumulative pretax income in the Canadian tax jurisdiction and due to the implementation of a tax-planning strategy, management determined that there is sufficient positive evidence to conclude that it is more likely than not that the deferred tax assets are realizable and therefore released the valuation allowance in the amount of $9.9 million.
Net Deferred Tax Assets and Liabilities [Table Text Block] | The components of our net deferred tax assets and liabilities at December 31, 2018 and 2017, are summarized as follows:
|  | December 31, 2018 |  | December 31, 2017
|  | (thousands)
Deferred tax assets |  |  |  |
Employee benefits |  | $ | 27,149 |  |  | $ | 30,853 |
Capital leases |  | 5,742 |  |  | 1,079 |
Inventories |  | 2,649 |  |  | 4,598 |
Foreign net operating loss carryforward |  | 3,108 |  |  | 5,137 |
Other |  | 6,461 |  |  | 4,924 |
Net deferred tax assets |  | $ | 45,109 |  |  | $ | 46,591 |
Deferred tax liabilities |  |  |  |
Property and equipment |  | $ | (48,302 | ) |  | $ | (47,946 | )
Intangible assets and other |  | (5,369 | ) |  | (4,168 | )
Other |  | (2,445 | ) |  | (1,867 | )
Deferred tax liabilities |  | $ | (56,116 | ) |  | $ | (53,981 | )
Total deferred tax liabilities, net |  | $ | (11,007 | ) |  | $ | (7,390 | )
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:
|  | 2018 |  | 2017 |  | 2016
|  | (thousands)
Balance as of January 1 |  | $ | 2,083 |  |  | $ | 2,224 |  |  | $ | 878 |
Increases related to prior years' tax positions |  | 13 |  |  | 1 |  |  | 1,657 |
Increases related to current year tax positions |  | — |  |  | 51 |  |  | 104 |
Decreases related to prior years' tax positions |  | (43 | ) |  | (12 | ) |  | — |
Lapse of statute of limitations |  | (203 | ) |  | (181 | ) |  | — |
Settlements |  | — |  |  | — |  |  | (415 | )
Balance as of December 31 |  | $ | 1,850 |  |  | $ | 2,083 |  |  | $ | 2,224 |

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