Available For Sale Marketable Debt Securities (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2011

Dec. 31, 2010

Available For Sale Marketable Debt Securities

Summary Of Amortized Cost And Estimated Fair Value Of Available For Sale Debt Securities

								Estimated
			Unrealized					Fair
	Cost		Gain		(Loss)			Value
Securities issued by government agencies	$	5,000	$	3		-		$	5,003
Corporate bonds		33,542		109		(2	)		33,649
Available for sale marketable debt securities	$	38,542	$	112	$	(2	)	$	38,652

								Estimated
			Unrealized					Fair
	Cost		Gain		(Loss)			Value
Corporate bonds	$	27,654	$	213	$	(1	)	$	27,866

Summary Of Contractual Maturities Of Available For Sale Debt Securities

	June 30, 2011
			Estimated Fair
	Cost		Value
Less than one year	$	17,787	$	17,806
Due between 1-2 years		13,676		13,756
Due between 2-5 years		7,079		7,090
Total	$	38,542	$	38,652