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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Effect of Tax Cuts and Jobs Act of 2017, Accounting Incomplete, Provisional [Abstract] |  |  |  |  |  |  |  |  |
Tax Cuts and Jobs Act of 2017 Accounting Complete [true false] |  |  |  | false |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 35.00% |  | 35.00% |  | 35.00% |
Tax Cuts and Jobs Act of 2017 Incomplete Accounting Provisional Income Tax Expense (Benefit) | $ (8,100) |  |  | $ (8,100) |  |  |  |  |
Pretax income (loss) from domestic and foreign sources [Abstract] |  |  |  |  |  |  |  |  |
Domestic |  |  |  | 115,083 |  | $ 41,703 |  | $ 79,414 |
Foreign |  |  |  | 2,505 |  | 1,598 |  | 1,268 |
Income before income taxes |  |  |  | 117,588 |  | 43,301 |  | 80,682 |
Deferred income tax provision (benefit) [Abstract] |  |  |  |  |  |  |  |  |
Federal |  |  |  | 22,541 |  | 10,664 |  | (2,938) |
State |  |  |  | 3,973 |  | 2,201 |  | 555 |
Foreign |  |  |  | 0 |  | 5 |  | 0 |
Total current |  |  |  | 26,514 |  | 12,870 |  | (2,383) |
Federal |  |  |  | 6,747 |  | 2,549 |  | 27,011 |
State |  |  |  | 991 |  | (1,536) |  | 3,872 |
Foreign |  |  |  | 379 |  | (8,836) |  | 0 |
Total deferred |  |  |  | 8,117 |  | (7,823) |  | 30,883 |
Income tax provision |  |  |  | 34,631 |  | 5,047 |  | 28,500 |
Income Tax Rate Reconciliation [Abstract] |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  | $ 117,588 |  | $ 43,301 |  | $ 80,682 |
Statutory U.S. income tax rate (as a percent) |  |  |  | 35.00% |  | 35.00% |  | 35.00% |
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) |  | 0 |  | 0 |
Change in valuation allowance |  | $ (8,500) |  | 0 | [1] | (9,884) | [1] | 0 | [1]
Tax credits |  |  |  | (912) |  | (2,904) |  | (2,043) |
Other |  |  |  | (154) |  | (242) |  | (836) |
Income tax provision |  |  |  | $ 34,631 |  | $ 5,047 |  | $ 28,500 |
Effective income tax rate (as a percent) |  |  |  | 29.50% |  | 11.70% |  | 35.30% |
Increase (decrease) in valuation allowance |  |  |  |  |  | $ (9,900) |  |  |
Income taxes paid, net |  |  |  | $ 36,100 |  | 6,700 |  | $ 700 |
Deferred tax assets [Abstract] |  |  |  |  |  |  |  |  |
Employee benefits | 30,853 | 54,895 |  | 30,853 |  | 54,895 |  |  |
Inventories | 4,598 | 5,237 |  | 4,598 |  | 5,237 |  |  |
Other | 6,003 | 7,628 |  | 6,003 |  | 7,628 |  |  |
Net deferred tax assets | 46,591 | 73,143 |  | 46,591 |  | 73,143 |  |  |
Deferred tax liabilities [Abstract] |  |  |  |  |  |  |  |  |
Property and equipment | (47,946) | (62,948) |  | (47,946) |  | (62,948) |  |  |
Intangible assets and other | (4,168) | (5,039) |  | (4,168) |  | (5,039) |  |  |
Other | (1,867) | (2,655) |  | (1,867) |  | (2,655) |  |  |
Deferred tax liabilities | (53,981) | (70,642) |  | (53,981) |  | (70,642) |  |  |
Total deferred tax liabilities, net | (7,390) |  |  | (7,390) |  |  |  |  |
Total deferred tax assets, net |  | 2,501 |  |  |  | 2,501 |  |  |
Reconciliation of unrecognized tax benefits, roll forward |  |  |  |  |  |  |  |  |
Balance as of January 1 |  |  | $ 2,083 | 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) |  | 0 |  | (7) |
Lapse of statute of limitations |  |  |  | (181) |  | 0 |  | 0 |
Settlements |  |  |  | 0 |  | (415) |  | 0 |
Balance as of December 31 | 2,083 | 2,224 |  | 2,083 |  | 2,224 |  | 878 |
Unrecognized tax benefits that would impact tax rate | 2,000 | 2,100 |  | 2,000 |  | 2,100 |  | $ 700 |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |  |  |
Deferred tax liabilities [Abstract] |  |  |  |  |  |  |  |  |
State income tax credits, subject to expiration | 1,600 |  |  | 1,600 |  |  |  |  |
CANADA | Subsidiaries [Member] |  |  |  |  |  |  |  |  |
Deferred tax assets [Abstract] |  |  |  |  |  |  |  |  |
Foreign net operating loss carryforward | 5,137 | $ 5,383 |  | 5,137 |  | $ 5,383 |  |  |
Deferred tax liabilities [Abstract] |  |  |  |  |  |  |  |  |
Foreign net operating loss carryforwards, subject to expiration | $ 23,300 |  |  | $ 23,300 |  |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |
Effect of Tax Cuts and Jobs Act of 2017, Accounting Incomplete, Provisional [Abstract] |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00% |  |  |  |  |  |
Income Tax Rate Reconciliation [Abstract] |  |  |  |  |  |  |  |  |
Statutory U.S. income tax rate (as a percent) |  |  | 21.00% |  |  |  |  |  |
[1] | 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.

X
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