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FAIR VALUE MEASUREMENTS - Summary of valuation of financial instruments measured at fair value on recurring basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Available-for-sale securities    
Fair Value $ 36,441 $ 37,484
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 $ 6,641 $ 6,575
Available-for-sale securities    
Total 36,441 37,484
Fair Value, Measurements, Recurring | Significant other observable inputs, Level 2 | Municipal Obligations    
Available-for-sale securities    
Fair Value 30,933 32,080
Fair Value, Measurements, Recurring | Significant other observable inputs, Level 2 | Corporate Obligations    
Available-for-sale securities    
Fair Value $ 5,508 $ 5,404
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