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INCOME TAXES (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current [Abstract]      
Federal $ 17,598,000 $ 10,257,000 $ 18,253,000
State 2,907,000 1,611,000 2,621,000
Current income tax expense (benefit) 20,505,000 11,868,000 20,874,000
Deferred [Abstract]      
Federal (2,476,000) 4,323,000 (706,000)
State (543,000) 477,000 54,000
Deferred income tax expense (benefit) (3,019,000) 4,800,000 (652,000)
Income tax expense (benefit) 17,486,000 16,668,000 20,222,000
Effective income tax rate reconciliation [Abstract]      
Statutory rates applied to income before income taxes 15,846,000 8,840,000 18,370,000
State income taxes, net of Federal tax benefit 1,487,000 788,000 1,610,000
Net permanent differences (11,000) 42,000 316,000
Release of debit balance in accumulated other comprehensive income related to settled pension obligations 0 6,866,000 0
Change in deferred tax asset valuation allowance 0 0 (1,363,000)
Change in state credits 0 110,000 1,466,000
Other 164,000 22,000 (177,000)
Income tax expense (benefit) 17,486,000 16,668,000 $ 20,222,000
Deferred tax assets [Abstract]      
Accounts receivable 772,000 743,000  
Property and equipment 9,250,000 5,787,000  
Leases 5,880,000 5,055,000  
Accrued liabilities 10,916,000 9,523,000  
Retirement benefits 579,000 720,000  
Other 31,000 31,000  
Total deferred tax assets 27,428,000 21,859,000  
Deferred tax liabilities [Abstract]      
Inventory 9,285,000 9,198,000  
Other 898,000 740,000  
Total deferred tax liabilities 10,183,000 9,938,000  
Net deferred tax assets 17,245,000 11,921,000  
Current assets (liabilities) [Abstract]      
Current deferred assets 0 5,801,000  
Current deferred liabilities 0 (11,490,000)  
Deferred tax assets (liabilities), current 0 (5,689,000)  
Non-current assets (liabilities) [Abstract]      
Non-current deferred assets 27,428,000 38,978,000  
Non-current deferred liabilities (10,183,000) (21,368,000)  
Deferred tax assets (liabilities) non current 17,245,000 17,610,000  
Net deferred tax assets 17,245,000 $ 11,921,000  
Tax benefit in net income charged to AOCI $ 6,866,000