Financial Instruments (Tables)

12 Months Ended

Dec. 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
As of December 31, 2013:		cost		gains		losses		value
Debt securities:
Corporate	$	103,175	$	23	$	(60)	$	103,138
Government agency		26,110		22		-		26,132
Total marketable investment securites	$	129,285	$	45	$	(60)	$	129,270

				Gross		Gross
				unrealized		unrealized
		Amortized		holding		holding		Fair
As of December 31, 2012:		cost		gains		losses		value
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 December 31, 2013 and 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
December 31, 2013
Available for Sale:
Debt securities:
Corporate	$	74,407	$	56	$	5,732	$	4	$	80,139	$	60
Government agency		-		-		-		-		-		-
	$	74,407	$	56	$	5,732	$	4	$	80,139	$	60
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

Summary of Contractual Maturities

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

		As of December 31, 2013				As of December 31, 2012
		Amortized				Amortized
		cost		Fair value		cost		Fair value
Due within one year	$	103,280	$	103,266	$	65,637	$	65,632
Due after one year through five years		26,005		26,004		17,629		17,612
Due after five years through ten years		-		-		-		-
Due after ten years		-		-		-		-
Total debt securities	$	129,285	$	129,270	$	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 Years Ended December 31,
		2013		2012		2011
Proceeds from sales and maturities	$	107,871	$	119,507	$	86,668
Realized gains		4		4		-
Realized losses		-		-		-