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Income Taxes (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Pretax income (loss) from domestic and foreign sources [Abstract]      
Domestic $ 105,341 $ 21,704 $ 115,083
Foreign 2,890 398 2,505
Income before income taxes 108,231 22,102 117,588
Deferred income tax provision (benefit) [Abstract]      
Federal 13,700 6,459 22,541
State 4,574 3,126 3,973
Foreign 7 5 0
Total current 18,281 9,590 26,514
Federal 7,430 (5,987) 6,747
State 925 (2,127) 991
Foreign 670 149 379
Total deferred 9,025 (7,965) 8,117
Income tax provision 27,306 1,625 34,631
Income Tax Rate Reconciliation [Abstract]      
Income before income taxes $ 108,231 $ 22,102 $ 117,588
Statutory U.S. income tax rate (as a percent) 21.00% 21.00% 35.00% [1]
Statutory tax provision $ 22,728 $ 4,642 $ 41,156
State taxes 4,390 741 3,719
Domestic production activities deduction 0 0 (963)
Unrecognized tax benefits (178) (181) (86)
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) 0 (3,806) [2] (8,129) [2]
Tax credits (725) (272) (912)
Foreign rate differential 71 432 (366)
Share-based compensation (532) (1,718) (413)
Nondeductible executive compensation 852 366 0
Meals and entertainment 738 886 663
Other (38) 535 (38)
Income tax provision $ 27,306 $ 1,625 $ 34,631
Effective income tax rate (as a percent) 25.20% 7.40% 29.50%
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) [Abstract]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 35.00% [1]
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) $ 0 $ (3,806) [2] $ (8,129) [2]
Tax Cuts and Jobs Act of 2017 Accounting Complete [true false]   true  
Pension contributions 5,238 $ 26,081 2,193
Income taxes paid (refunds), net (1,400) 14,500 36,100
Deferred tax assets [Abstract]      
Employee benefits 26,914 27,149  
Lease Liabilities 23,241 0  
Capital Leases 0 5,742  
Inventories 3,358 2,649  
Foreign net operating loss carryforward 1,514 3,108  
Other 6,256 6,461  
Net deferred tax assets 61,283 45,109  
Deferred tax liabilities [Abstract]      
Property and equipment (50,751) (48,302)  
Right-of-use assets (21,753) 0  
Intangible assets and other (5,924) (5,369)  
Other (1,597) (2,445)  
Deferred tax liabilities (80,025) (56,116)  
Total deferred tax liabilities, net (18,742) (11,007)  
Reconciliation of unrecognized tax benefits, roll forward      
Balance as of January 1 1,850 2,083 2,224
Increases related to prior years' tax positions 0 13 1
Increases related to current year tax positions 53 0 51
Decreases related to prior years' tax positions 0 (43) (12)
Lapse of statute of limitations (218) (203) (181)
Balance as of December 31 1,685 1,850 2,083
Unrecognized tax benefits that would impact tax rate 1,700 1,800 $ 2,000
State and Local Jurisdiction [Member]      
Deferred tax liabilities [Abstract]      
State income tax credits, subject to expiration 1,300    
CANADA | Subsidiaries [Member]      
Deferred tax liabilities [Abstract]      
Foreign net operating loss carryforwards, subject to expiration $ 10,400    
Pension Plan, Discretionary Contributions [Member]      
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) [Abstract]      
Pension contributions   $ 20,000  
[1]
On December 22, 2017, the Tax Cuts and Jobs Act (the “Tax Act”), was enacted by the U.S. government. The most significant impact to our financial statements was the reduction of the corporate federal income tax rate from 35% to 21%.
[2]
As of December 31, 2018, we completed our assessment of the effects of the Tax Act on our financial statements. In connection with our analysis of the Tax Act, we recorded discrete tax benefits of $3.8 million and $8.1 million, respectively, during the years ended December 31, 2018 and 2017. The $3.8 million reduction in income tax expense resulted from the remeasurement of deferred income taxes to the new federal statutory rate of 21%, which mostly relates to a $20.0 million discretionary pension contribution made during 2018, for which we received a tax deduction at the 2017 federal income tax rate. The $8.1 million reduction in income tax expense resulted from the remeasurement of deferred income taxes to the new federal statutory rate of 21%.