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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Pretax income (loss) from domestic and foreign sources [Abstract] |  |  |  |
Domestic |  | $ 41,703 | $ 79,414 | $ 122,727
Foreign |  | 1,598 | 1,268 | 578
Income before income taxes |  | 43,301 | 80,682 | 123,305
Deferred income tax provision (benefit) [Abstract] |  |  |  |
Federal |  | 10,664 | (2,938) | 27,568
State |  | 2,201 | 555 | 5,023
Foreign |  | 5 | 0 | 0
Total current |  | 12,870 | (2,383) | 32,591
Federal |  | 2,549 | 27,011 | 9,740
State |  | (1,536) | 3,872 | 965
Foreign |  | (8,836) | 0 | 0
Total deferred |  | (7,823) | 30,883 | 10,705
Income tax provision |  | 5,047 | 28,500 | 43,296
Income Tax Rate Reconciliation [Abstract] |  |  |  |
Income before income taxes |  | $ 43,301 | $ 80,682 | $ 123,305
Statutory U.S. income tax rate (as a percent) |  | 35.00% | 35.00% | 35.00%
Statutory tax provision |  | $ 15,155 | $ 28,239 | $ 43,157
State taxes |  | 1,370 | 3,006 | 4,097
Domestic production activities deduction |  | (165) | (299) | (2,031)
Unrecognized tax benefits |  | 1,717 | 433 | 313
Change in valuation allowance |  | (9,884) | 0 | 0
Tax credits |  | (2,904) | (2,043) | (2,581)
Other |  | (242) | (836) | 341
Income tax provision |  | $ 5,047 | $ 28,500 | $ 43,296
Effective income tax rate (as a percent) |  | 11.70% | 35.30% | 35.10%
Income taxes paid, net |  | $ 6,700 | $ 700 | $ 40,300
Deferred tax assets [Abstract] |  |  |  |
Employee benefits |  | 54,895 | 52,840 |
Inventories |  | 5,237 | 6,618 |
Other |  | 7,628 | 8,070 |
Gross deferred tax assets |  | 73,143 | 72,968 |
Valuation allowance | [1] | 0 | (9,884) |
Net deferred tax assets |  | 73,143 | 63,084 |
Deferred tax liabilities [Abstract] |  |  |  |
Property and equipment |  | 62,948 | 56,061 |
Intangible assets and other |  | 5,039 | 5,264 |
Other |  | 2,655 | 851 |
Deferred tax liabilities |  | 70,642 | 62,176 |
As reported on our Consolidated Balance Sheet [Abstract] |  |  |  |
Total deferred tax assets, net |  | 2,501 | 908 |
Increase (decrease) in valuation allowance |  | (9,900) |  |
Reconciliation of unrecognized tax benefits, roll forward |  |  |  |
Balance as of January 1 |  | 878 | 309 | 0
Increases related to prior years' tax positions |  | 1,657 | 431 | 172
Increases related to current year tax positions |  | 104 | 145 | 137
Decreases related to prior years' tax positions |  | 0 | (7) | 0
Settlements |  | (415) | 0 | 0
Balance as of December 31 |  | 2,224 | 878 | 309
Unrecognized tax benefits that would impact tax rate |  | 2,100 | 700 | $ 300
State and Local Jurisdiction [Member] |  |  |  |
As reported on our Consolidated Balance Sheet [Abstract] |  |  |  |
State income tax credits, subject to expiration |  | 1,400 |  |
CANADA | Subsidiaries [Member] |  |  |  |
Deferred tax assets [Abstract] |  |  |  |
Foreign net operating loss carryforward |  | 5,383 | $ 5,440 |
As reported on our Consolidated Balance Sheet [Abstract] |  |  |  |
Foreign net operating loss carryforwards, subject to expiration |  | $ 24,000 |  |
[1] | As of December 31, 2016 and 2015, the deferred tax assets in our foreign subsidiaries were 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.

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