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MARKETABLE SECURITIES - Amortized cost basis, fair value and net unrealized gains on available-for-sale securities (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis $ 36,969 $ 36,612
Fair Value 37,299 36,923
Net Unrealized Gains 330 312
Municipal Obligations
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 35,703 35,342
Fair Value 35,993 35,606
Net Unrealized Gains 290 264
Corporate Obligations
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 1,266 1,270
Fair Value 1,306 1,317
Net Unrealized Gains $ 40 $ 48