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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
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
|  | 2017 |  | 2016 |  | 2015
|  | (thousands)
Domestic |  | $ | 115,083 |  |  | $ | 41,703 |  |  | $ | 79,414 |
Foreign |  | 2,505 |  |  | 1,598 |  |  | 1,268 |
Income before income taxes |  | $ | 117,588 |  |  | $ | 43,301 |  |  | $ | 80,682 |
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
|  | 2017 |  | 2016 |  | 2015
|  | (thousands)
Current income tax provision (benefit) |  |  |  |  |  |
Federal |  | $ | 22,541 |  |  | $ | 10,664 |  |  | $ | (2,938 | )
State |  | 3,973 |  |  | 2,201 |  |  | 555 |
Foreign |  | — |  |  | 5 |  |  | — |
Total current |  | 26,514 |  |  | 12,870 |  |  | (2,383 | )
Deferred income tax provision (benefit) |  |  |  |  |  |
Federal |  | 6,747 |  |  | 2,549 |  |  | 27,011 |
State |  | 991 |  |  | (1,536 | ) |  | 3,872 |
Foreign |  | 379 |  |  | (8,836 | ) |  | — |
Total deferred |  | 8,117 |  |  | (7,823 | ) |  | 30,883 |
Income tax provision |  | $ | 34,631 |  |  | $ | 5,047 |  |  | $ | 28,500 |
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
|  | 2017 |  | 2016 |  | 2015
|  | (thousands, except percentages)
Income before income taxes |  | $ | 117,588 |  |  | $ | 43,301 |  |  | $ | 80,682 |
Statutory U.S. income tax rate |  | 35.0 | % |  | 35.0 | % |  | 35.0 | %
Statutory tax provision |  | $ | 41,156 |  |  | $ | 15,155 |  |  | $ | 28,239 |
State taxes |  | 3,719 |  |  | 1,370 |  |  | 3,006 |
Domestic production activities deduction |  | (963 | ) |  | (165 | ) |  | (299 | )
Unrecognized tax benefits |  | (86 | ) |  | 1,717 |  |  | 433 |
Benefit from enactment of the Tax Cuts and Jobs Act |  | (8,129 | ) |  | — |  |  | — |
Change in valuation allowance (a) |  | — |  |  | (9,884 | ) |  | — |
Tax credits |  | (912 | ) |  | (2,904 | ) |  | (2,043 | )
Other |  | (154 | ) |  | (242 | ) |  | (836 | )
Total |  | $ | 34,631 |  |  | $ | 5,047 |  |  | $ | 28,500 |
Effective income tax rate |  | 29.5 | % |  | 11.7 | % |  | 35.3 | %
Net Deferred Tax Assets and Liabilities [Table Text Block] | The components of our net deferred tax assets and liabilities at December 31, 2017 and 2016, are summarized as follows:
|  | December 31, 2017 |  | December 31, 2016
|  | (thousands)
Deferred tax assets |  |  |  |
Employee benefits |  | $ | 30,853 |  |  | $ | 54,895 |
Inventories |  | 4,598 |  |  | 5,237 |
Foreign net operating loss carryforward |  | 5,137 |  |  | 5,383 |
Other |  | 6,003 |  |  | 7,628 |
Net deferred tax assets |  | $ | 46,591 |  |  | $ | 73,143 |
Deferred tax liabilities |  |  |  |
Property and equipment |  | $ | (47,946 | ) |  | $ | (62,948 | )
Intangible assets and other |  | (4,168 | ) |  | (5,039 | )
Other |  | (1,867 | ) |  | (2,655 | )
Deferred tax liabilities |  | $ | (53,981 | ) |  | $ | (70,642 | )
Total deferred tax assets (liabilities), net |  | $ | (7,390 | ) |  | $ | 2,501 |
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:
|  | 2017 |  | 2016 |  | 2015
|  | (thousands)
Balance as of January 1 |  | $ | 2,224 |  |  | $ | 878 |  |  | $ | 309 |
Increases related to prior years' tax positions |  | 1 |  |  | 1,657 |  |  | 431 |
Increases related to current year tax positions |  | 51 |  |  | 104 |  |  | 145 |
Decreases related to prior years' tax positions |  | (12 | ) |  | — |  |  | (7 | )
Lapse of statute of limitations |  | (181 | ) |  | — |  |  | — |
Settlements |  | — |  |  | (415 | ) |  | — |
Balance as of December 31 |  | $ | 2,083 |  |  | $ | 2,224 |  |  | $ | 878 |

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