Marketable Securities

12 Months Ended

Dec. 31, 2014

Cash, Cash Equivalents, and Investments [Abstract]

Cash, Cash Equivalents and Investments

3 Marketable Securities

The Company's marketable securities within cash equivalents and investments included in the consolidated balance sheets are detailed as follows (in thousands):

		December 31, 2014
		Amortized		Unrealized		Unrealized		Fair
		Cost		Gain		Loss		Value
U.S. Treasury securities		$	626,683	$	246	$	(157)	$	626,772
Foreign government securities			24,998		-		-		24,998
Corporate debt securities			984,668		125		(688)		984,105
Time deposits			64,240		-		-		64,240
Equity securities			77		70		-		147
	Total	$	1,700,666	$	441	$	(845)	$	1,700,262
Amounts included in:
	Cash equivalents	$	67,051	$	-	$	-	$	67,051
	Investments		1,633,615		441		(845)		1,633,211
	Total	$	1,700,666	$	441	$	(845)	$	1,700,262

		December 31, 2013
		Amortized		Unrealized		Unrealized		Fair
		Cost		Gain		Loss		Value
U.S. Treasury securities		$	556,438	$	111	$	(10)	$	556,539
Foreign government securities			139,670		-		-		139,670
Corporate debt securities			629,477		190		(233)		629,434
Time deposits			74,050		-		-		74,050
Equity securities			77		70		-		147
	Total	$	1,399,712	$	371	$	(243)	$	1,399,840
Amounts included in:
	Cash equivalents	$	36,966	$	-	$	-	$	36,966
	Investments		1,362,746		371		(243)		1,362,874
	Total	$	1,399,712	$	371	$	(243)	$	1,399,840

The estimated fair value of marketable debt securities by maturity date is as follows (in thousands):

		December 31, 2014		December 31, 2013
Due in one year or less		$	872,872	$	1,011,459
Due after one year through three years			763,003		314,184
	Total	$	1,635,875	$	1,325,643

In the year ended December 31, 2013, the Company recorded a $2 million charge for an other-than-temporary impairment to an investment. Realized gains and losses on sales of investments were not material in 2014, 2013 and 2012.