INVESTMENTS (Tables)

9 Months Ended

Sep. 30, 2015

INVESTMENTS

Schedule of investments

			Gross Unrealized
					Losses
	Amortized				Less than		Greater than		Estimated
	Cost		Gains		One Year		One Year		Fair Value
	(In thousands)
September 30, 2015
Short-term investments:
Available-for-sale securities:
U.S. government and agency debt securities	$	306,522	$	433	$	(6)	$	—	$	306,949
Corporate debt securities		211,428		95		(62)		—		211,461
International government agency debt securities		31,005		12		(7)		—		31,010
Total short-term investments		548,955		540		(75)		—		549,420
Long-term investments:
Available-for-sale securities:
Corporate debt securities		29,279		—		(151)		—		29,128
U.S. government and agency debt securities		12,998		—		(6)		—		12,992
		42,277		—		(157)		—		42,120
Held-to-maturity securities:
Certificates of deposit		1,619		—		—		—		1,619
Total long-term investments		43,896		—		(157)		—		43,739
Total investments	$	592,851	$	540	$	(232)	$	—	$	593,159
December 31, 2014
Short-term investments:
Available-for-sale securities:
U.S. government and agency debt securities	$	226,387	$	88	$	(15)	$	—	$	226,460
Corporate debt securities		140,900		26		(66)		—		140,860
International government agency debt securities		39,774		13		(5)		—		39,782
Total short-term investments		407,061		127		(86)		—		407,102
Long-term investments:
Available-for-sale securities:
U.S. government and agency debt securities		100,429		—		(196)		(40)		100,193
Corporate debt securities		61,187		—		(84)		—		61,103
International government agency debt securities		7,568		—		(2)		(1)		7,565
		169,184		—		(282)		(41)		168,861
Held-to-maturity securities:
Certificates of deposit		1,619		—		—		—		1,619
Total long-term investments		170,803		—		(282)		(41)		170,480
Total investments	$	577,864	$	127	$	(368)	$	(41)	$	577,582

Proceeds from the sales and maturities of marketable securities, plus the resulting realized gains and losses

	Nine Months Ended
	September 30,
(In thousands)	2015		2014
Proceeds from the sales and maturities of marketable securities	$	335,169	$	246,540
Realized gains	$	109	$	15,352
Realized losses	$	3	$	10

The cost and fair value of available-for-sale and held-to-maturity securities by contractual maturity

The Company’s available-for-sale and held-to-maturity securities at September 30,2015 had contractual maturities in the following periods:

	Available-for-sale				Held-to-maturity
	Amortized		Estimated		Amortized		Estimated
(In thousands)	Cost		Fair Value		Cost		Fair Value
Within 1 year	$	356,179	$	356,259	$	1,619	$	1,619
After 1 year through 5 years		235,053		235,281		—		—
Total	$	591,232	$	591,540	$	1,619	$	1,619