Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2012

Notes to Financial Statements

Marketable investment securities

The following is a summary of the Company's marketable investment securities (in thousands):

				Gross		Gross
				unrealized		unrealized
		Amortized		holding		holding		Fair
		cost		gains		losses		value
As of June 30, 2012:
Debt securities:
Corporate	$	51,402	$	6	$	(34)	$	51,374
Government agency		28,312		3		(5)		28,310
Total marketable investment securites	$	79,714	$	9	$	(39)	$	79,684

				Gross		Gross
				unrealized		unrealized
		Amortized		holding		holding		Fair
		cost		gains		losses		value
As of December 31, 2011:
Debt securities:
Corporate	$	49,296	$	1	$	(124)	$	49,173
Government agency		30,668		3		(12)		30,659
Total marketable investment securites	$	79,964	$	4	$	(136)	$	79,832

Marketable investment securities available for sale in an unrealized loss position

Marketable investment securities available for sale in an unrealized loss position as of June 30, 2012 and December 31, 2011 are summarized as follows (in thousands):

		Held for less than 12 months				Held for more than 12 months				Total
				Unrealized				Unrealized				Unrealized
		Fair value		losses		Fair value		losses		Fair value		losses
As of June 30, 2012:
Available for Sale:
Debt securities:
Corporate	$	37,624	$	34	$	-	$	-	$	37,624	$	34
Government agency		14,601		5		-		-		14,601		5
	$	52,225	$	39	$	-	$	-	$	52,225	$	39
As of December 31, 2011:
Available for Sale:
Debt securities:
Corporate	$	38,276	$	124	$	-	$	-	$	38,276	$	124
Government agency		23,425		12		-		-		23,425		12
	$	61,701	$	136	$	-	$	-	$	61,701	$	136

Maturities of marketable investment securities

Maturities of marketable investment securities are as follows at June 30, 2012 and December 31, 2011 (in thousands):

		As of June 30, 2012				As of December 31, 2011
		Amortized				Amortized
		cost		Fair value		cost		Fair value
Due within one year	$	79,714	$	79,684	$	70,902	$	70,794
Due after one year through five years		-		-		9,062		9,038
Due after five years through ten years		-		-		-		-
Due after ten years		-		-		-		-
Total debt securities	$	79,714	$	79,684	$	79,964	$	79,832

Proceeds from maturities and sales of available for sale securities and resulting gain and losses

The proceeds from maturities and sales of available for sale securities and resulting realized gains and losses, were as follows (in thousands):

		For the Three Months				For the Six Months
		Ended June 30,				Ended June 30,
		2012		2011		2012		2011
Proceeds from sales and maturities	$	29,386	$	23,754	$	56,582	$	38,271
Realized gains		3		-		3		-
Realized losses		-		-		-		-