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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

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