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Marketable Securities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Summary of Unrealized gain (loss) on investment    
Available-for-sale securities- matures within one year, Amortized cost $ 15,741 $ 22,204
Available-for-sale securities- matures after one year through three years, Amortized cost 39,075 47,822
Amortized cost, Total 54,816 70,026
Available-for-sale securities- matures within one year, Gross unrealized gains 46 16
Available-for-sale securities- matures after one year through three years, Gross unrealized gains 73 84
Gross unrealized gains, Total 119 100
Available-for-sale securities- matures within one year, Gross unrealized losses (38) (115)
Available-for-sale securities- matures after one year through three years, Gross unrealized losses (366) (984)
Gross unrealized losses, Total (404) (1,099)
Available-for-sale securities- matures within one year, Fair value 15,749 22,105
Available-for-sale securities- matures after one year through three years, Fair value 38,782 46,922
Fair value, Total 54,531 69,027
Certificates of deposits [Member]
   
Summary of Unrealized gain (loss) on investment    
Available-for-sale securities- matures after one year through three years, Amortized cost 1,960 2,206
Available-for-sale securities- matures after one year through three years, Gross unrealized losses (1) (2)
Available-for-sale securities- matures after one year through three years, Fair value 1,959 2,204
Corporate bonds [Member]
   
Summary of Unrealized gain (loss) on investment    
Available-for-sale securities- matures within one year, Amortized cost 15,741 22,204
Available-for-sale securities- matures after one year through three years, Amortized cost 36,532 45,024
Available-for-sale securities- matures within one year, Gross unrealized gains 46 16
Available-for-sale securities- matures after one year through three years, Gross unrealized gains 73 84
Available-for-sale securities- matures within one year, Gross unrealized losses (38) (115)
Available-for-sale securities- matures after one year through three years, Gross unrealized losses (363) (979)
Available-for-sale securities- matures within one year, Fair value 15,749 22,105
Available-for-sale securities- matures after one year through three years, Fair value 36,242 44,129
Foreign government bond [Member]
   
Summary of Unrealized gain (loss) on investment    
Available-for-sale securities- matures after one year through three years, Amortized cost 583 592
Available-for-sale securities- matures after one year through three years, Gross unrealized losses (2) (3)
Available-for-sale securities- matures after one year through three years, Fair value $ 581 $ 589