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INDEBTEDNESS (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument [Line Items]      
Ratio of Indebtedness to Net Capital 0.58    
consolidated interest coverage ratio 38.8    
restricted payments under the Credit Agreement $ 5,000,000    
Write-off of deferred financing costs 765,000 0 1,388,000
Long-term Debt     0
Minimum [Member]
     
Debt Instrument [Line Items]      
consolidated interest coverage ratio 3.5    
Maximum [Member]
     
Debt Instrument [Line Items]      
Ratio of Indebtedness to Net Capital 3    
Ratio of Indebtedness to Net Capital, Pro forma basis 2.0    
Credit Agreement [Member]
     
Debt Instrument [Line Items]      
Face amount on debt 14,200,000    
Number of wholly-owned subsidiaries 3    
Debt issuance costs 1,100,000    
Long-term Debt 46,000,000 15,000,000  
Credit Agreement [Member] | LIBOR [Member]
     
Debt Instrument [Line Items]      
Interest margin 1.75% 2.75%  
Long-term Debt 46,000,000 15,000,000  
Credit Agreement [Member] | LIBOR [Member] | Minimum [Member]
     
Debt Instrument [Line Items]      
Interest margin 1.75%    
Credit Agreement [Member] | LIBOR [Member] | Maximum [Member]
     
Debt Instrument [Line Items]      
Interest margin 2.50%    
Credit Agreement [Member] | Base Rate [Member] | Minimum [Member]
     
Debt Instrument [Line Items]      
Interest margin 0.75%    
Credit Agreement [Member] | Base Rate [Member] | Maximum [Member]
     
Debt Instrument [Line Items]      
Interest margin 1.50%    
Previous Credit Facility [Member]
     
Debt Instrument [Line Items]      
Write-off of deferred financing costs 765,000    
Debt Instrument, Periodic Payment, Principal     1,000,000
Previous Credit Facility [Member] | LIBOR [Member] | Minimum [Member]
     
Debt Instrument [Line Items]      
Interest margin 2.75%    
Previous Credit Facility [Member] | LIBOR [Member] | Maximum [Member]
     
Debt Instrument [Line Items]      
Interest margin 3.50%    
Previous Credit Facility [Member] | Base Rate [Member] | Minimum [Member]
     
Debt Instrument [Line Items]      
Interest margin 1.75%    
Previous Credit Facility [Member] | Base Rate [Member] | Maximum [Member]
     
Debt Instrument [Line Items]      
Interest margin 2.50%    
Revolving Credit Facility [Member]
     
Debt Instrument [Line Items]      
Maximum available to be borrowed under revolving facility 109,000,000 70,000,000  
Revolving Credit Facility [Member] | Credit Agreement [Member]
     
Debt Instrument [Line Items]      
Maximum available to be borrowed under revolving facility 155,000,000    
Revolving Credit Facility [Member] | Previous Credit Facility [Member]
     
Debt Instrument [Line Items]      
Maximum available to be borrowed under revolving facility 70,000,000    
Long-term Debt     0
Term Facility [Member] | Previous Credit Facility [Member]
     
Debt Instrument [Line Items]      
Maximum available to be borrowed under revolving facility 20,000,000    
Long-term Debt     $ 0