Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2013

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 March 31, 2013:
Debt securities:
Corporate	$	38,452	$	3	$	(31)	$	38,424
Government agency		32,644		16		(1)		32,659
Total marketable investment securites	$	71,096	$	19	$	(32)	$	71,083

				Gross		Gross
				unrealized		unrealized
		Amortized		holding		holding		Fair
		cost		gains		losses		value
As of December 31, 2012:
Debt securities:
Corporate	$	50,822	$	3	$	(31)	$	50,794
Government agency		32,444		10		(4)		32,450
Total marketable investment securites	$	83,266	$	13	$	(35)	$	83,244

Marketable investment securities available for sale in an unrealized loss position

Marketable investment securities available for sale in an unrealized loss position as of March 31, 2013 and December 31, 2012 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 March 31, 2013:
Available for Sale:
Debt securities:
Corporate	$	33,304	$	31	$	-	$	-	$	33,304	$	31
Government agency		4,932		1		-		-		4,932		1
	$	38,236	$	32	$	-	$	-	$	38,236	$	32
As of December 31, 2012:
Available for Sale:
Debt securities:
Corporate	$	37,974	$	31	$	-	$	-	$	37,974	$	31
Government agency		7,110		4		-		-		7,110		4
	$	45,084	$	35	$	-	$	-	$	45,084	$	35

Maturities of marketable investment securities

Maturities of marketable investment securities are as follows at March 31, 2013 and December 31, 2012 (in thousands):

		As of March 31, 2013				As of December 31, 2012
		Amortized				Amortized
		cost		Fair value		cost		Fair value
Due within one year	$	69,674	$	69,660	$	65,637	$	65,632
Due after one year through five years		1,422		1,423		17,629		17,612
Due after five years through ten years		-		-		-		-
Due after ten years		-		-		-		-
	$	71,096	$	71,083	$	83,266	$	83,244

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
		Ended March 31,
		2013		2012
Proceeds from sales and maturities	$	28,007	$	27,196
Realized gains		-		-
Realized losses		-		-