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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) [Abstract]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   21.00% 35.00% 35.00%
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) $ 8,100 $ (3,806) $ (8,129) $ 0
Tax Cuts and Jobs Act of 2017 Accounting Complete [true false]   true    
Pretax income (loss) from domestic and foreign sources [Abstract]        
Domestic   $ 21,704 115,083 41,703
Foreign   398 2,505 1,598
Income before income taxes   22,102 117,588 43,301
Deferred income tax provision (benefit) [Abstract]        
Federal   6,459 22,541 10,664
State   3,126 3,973 2,201
Foreign   5 0 5
Total current   9,590 26,514 12,870
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 [Abstract]        
Income before income taxes   $ 22,102 $ 117,588 $ 43,301
Statutory U.S. income tax rate (as a percent)   21.00% 35.00% 35.00%
Statutory tax provision   $ 4,642 $ 41,156 $ 15,155
State taxes   741 3,719 1,370
Domestic production activities deduction   0 (963) (165)
Unrecognized tax benefits   (181) (86) 1,717
Change in valuation allowance (a) [1]   0 0 (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 0 0
Meals and entertainment   886 663 601
Other   535 (38) (859)
Income tax provision   $ 1,625 $ 34,631 $ 5,047
Effective income tax rate (as a percent)   7.40% 29.50% 11.70%
Increase (decrease) in valuation allowance       $ (9,900)
Income taxes paid, net   $ 14,500 $ 36,100 6,700
Deferred tax assets [Abstract]        
Employee benefits 30,853 27,149 30,853  
Capital Leases 1,079 5,742 1,079  
Inventories 4,598 2,649 4,598  
Foreign net operating loss carryforward 5,137 3,108 5,137  
Other 4,924 6,461 4,924  
Net deferred tax assets 46,591 45,109 46,591  
Deferred tax liabilities [Abstract]        
Property and equipment (47,946) (48,302) (47,946)  
Intangible assets and other (4,168) (5,369) (4,168)  
Other (1,867) (2,445) (1,867)  
Deferred tax liabilities (53,981) (56,116) (53,981)  
Total deferred tax liabilities, net (7,390) (11,007) (7,390)  
Reconciliation of unrecognized tax benefits, roll forward        
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   0 51 104
Decreases related to prior years' tax positions   (43) (12) 0
Lapse of statute of limitations   (203) (181) 0
Settlements   0 0 (415)
Balance as of December 31 2,083 1,850 2,083 2,224
Unrecognized tax benefits that would impact tax rate $ 2,000 1,800 $ 2,000 $ 2,100
State and Local Jurisdiction [Member]        
Deferred tax liabilities [Abstract]        
State income tax credits, subject to expiration   1,500    
CANADA | Subsidiaries [Member]        
Deferred tax liabilities [Abstract]        
Foreign net operating loss carryforwards, subject to expiration   $ 15,700    
[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.