FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Sep. 30, 2015

FAIR VALUE

Summary of the Company's assets and liabilities measured at fair value on a recurring basis

	September 30,
(In thousands)	2015		Level 1		Level 2		Level 3
Assets:
U.S. government and agency debt securities	$	319,941	$	189,827	$	130,114	$	—
Corporate debt securities		240,589		—		240,589		—
International government agency debt securities		31,010		—		31,010		—
Contingent consideration		60,300		—		—		60,300
Common stock warrants		2,681		—		—		2,681
Total	$	654,521	$	189,827	$	401,713	$	62,981

	December 31,
	2014		Level 1		Level 2		Level 3
Assets:
U.S. government and agency debt securities	$	326,653	$	189,030	$	137,623	$	—
Corporate debt securities		201,963		—		201,963		—
International government agency debt securities		47,347		—		47,347		—
Total	$	575,963	$	189,030	$	386,933	$	—

Schedule of rollforward of the fair value of the Company's investments whose fair value was determined using Level 3 inputs

(In thousands)	Fair Value
Balance, January 1, 2015	$	—
Acquisition of contingent consideration		57,600
Acquisition of common stock warrants		2,123
Increase in fair value of contingent consideration		2,700
Increase in fair value of warrants		558
Balance, September 30, 2015	$	62,981

Estimated fair value of term loans

The estimated fair value of these term loans, which was based on quoted market price indications (Level 2 in the fair value hierarchy) and may not be representative of actual values that could have been or will be realized in the future, was as follows at September 30,2015:  

	Carrying		Estimated
(In thousands)	Value		Fair Value
Term Loan B-1	$	289,512	$	289,787
Term Loan B-2	$	63,712	$	63,551