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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
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis $ 37,856 $ 36,612
Fair Value 38,007 36,923
Net Unrealized Gains 151 312
Municipal Obligations
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 37,102 35,342
Fair Value 37,245 35,606
Net Unrealized Gains 143 264
Corporate Obligations
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 754 1,270
Fair Value 762 1,317
Net Unrealized Gains $ 8 $ 48