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MARKETABLE SECURITIES - Gross unrealized gains (losses) on marketable securities (Details 1) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized Gains $ 494 $ 354
Gross unrealized (Losses) (1) (29)
Municipal obligations
   
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized Gains 434 308
Gross unrealized (Losses) (1) (29)
Corporate obligations
   
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized Gains 60 46
Gross unrealized (Losses)