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INCOME TAXES (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Components of income before income taxes [Abstract]      
Domestic $ 86,567 $ 84,349 $ 51,995
Foreign 8,150 660 0
Income before income taxes 94,717 85,009 51,995
Current [Abstract]      
Federal 21,481 27,393 15,401
State 2,681 4,438 2,731
Foreign 7,484 963 0
Total current 31,646 32,794 18,132
Deferred [Abstract]      
Federal 8,631 1,835 2,081
State 167 146 345
Foreign (5,964) (751) 0
Total Deferred 2,834 1,230 2,426
Total 34,480 34,024 20,558
Federal statutory income tax rate (in hundredths) 35.00%    
The difference between income taxes computed at the federal statutory income tax rate and the provision for income taxes [Abstract]      
Income taxes computed at federal statutory rate 33,150 29,753 18,198
State income taxes, net of federal benefit 1,852 2,917 1,999
Other, primarily non-tax deductible items (522) 1,354 361
Total 34,480 34,024 20,558
The net current and noncurrent components of deferred income tax balances [Abstract]      
Net current assets 7,713 5,182  
Net non-current assets 0 0  
Net non-current liabilities (21,938) (16,448)  
Net deferred tax asset (liability) (14,225) (11,266)  
Deferred tax assets [Abstract]      
Allowance for doubtful accounts 2,849 2,408  
Inventories 2,514 1,803  
Accruals 945 842  
Other 1,401 342  
Total deferred tax assets 7,709 5,395  
Less valuation allowance 0 0  
Total deferred tax assets, net of valuation allowance 7,709 5,395  
Deferred tax liabilities [Abstract]      
Goodwill 1,159 2,270  
Intangibles (10,707) (9,232)  
Property and equipment (11,697) (8,430)  
Unremitted foreign earnings (818) (577)  
Cumulative translation adjustment 1,275 (298)  
Other (1,146) (394)  
Net deferred tax asset (liability) $ (14,225) $ (11,266)