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INCOME TAXES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current [Abstract]      
Federal $ 16,259 $ 17,598 $ 10,257
State 2,326 2,907 1,611
Current income tax expense (benefit) 18,585 20,505 11,868
Deferred [Abstract]      
Federal (690) (2,476) 4,323
State (430) (543) 477
Deferred income tax expense (benefit) (1,120) (3,019) 4,800
Income tax expense (benefit) 17,465 17,486 16,668
Effective income tax rate reconciliation [Abstract]      
Statutory rates applied to income before income taxes 16,037 15,846 8,840
State income taxes, net of Federal tax benefit 1,494 1,487 788
Net permanent differences 99 (11) 42
Release of debit balance in accumulated other comprehensive income related to settled pension obligations 0 0 6,866
Change in state credits 0 0 110
Other (165) 164 22
Income tax expense (benefit) 17,465 17,486 $ 16,668
Deferred tax assets [Abstract]      
Accounts receivable 808 772  
Property and equipment 10,276 9,250  
Leases 5,913 5,880  
Accrued liabilities 12,217 10,916  
Retirement benefits 513 579  
Other 69 31  
Total deferred tax assets 29,796 27,428  
Deferred tax liabilities [Abstract]      
Inventory 10,082 9,285  
Other 1,338 898  
Total deferred tax liabilities 11,420 10,183  
Net deferred tax assets 18,376 17,245  
Non-current assets (liabilities) [Abstract]      
Net deferred tax assets 18,376 $ 17,245  
Tax benefit in net income charged to AOCI $ 6,866