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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
Jun. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis $ 55,302 $ 53,776
Fair Value 55,700 54,101
Net Unrealized Gain 397 325
Municipal Obligations
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 53,046 49,553
Fair Value 53,385 49,832
Net Unrealized Gain 338 279
Corporate Obligations
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 2,256 4,223
Fair Value 2,315 4,269
Net Unrealized Gain $ 59 $ 46