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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.