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FAIR VALUE MEASUREMENTS - Summary of valuation of financial instruments measured at fair value on recurring basis (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Available-for-sale securities    
Fair Value $ 36,588 $ 36,923
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets, Level 1
    
Assets:    
Trading securities      
Available-for-sale securities    
Total      
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets, Level 1 | Municipal Obligations
    
Available-for-sale securities    
Fair Value      
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets, Level 1 | Corporate Obligations
    
Available-for-sale securities    
Fair Value      
Fair Value, Measurements, Recurring | Significant other observable inputs, Level 2
    
Assets:    
Trading securities 6,388 6,026
Available-for-sale securities    
Total 36,588 36,923
Fair Value, Measurements, Recurring | Significant other observable inputs, Level 2 | Municipal Obligations
    
Available-for-sale securities    
Fair Value 36,132 35,606
Fair Value, Measurements, Recurring | Significant other observable inputs, Level 2 | Corporate Obligations
    
Available-for-sale securities    
Fair Value 456 1,317
Fair Value, Measurements, Recurring | Significant unobservable inputs, Level 3
    
Assets:    
Trading securities      
Available-for-sale securities    
Total      
Fair Value, Measurements, Recurring | Significant unobservable inputs, Level 3 | Municipal Obligations
    
Available-for-sale securities    
Fair Value      
Fair Value, Measurements, Recurring | Significant unobservable inputs, Level 3 | Corporate Obligations
    
Available-for-sale securities    
Fair Value