Fair Value Of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Fair Value, Assets And Liabilities Measured On Recurring Basis

The following table summarizes the Company’s financial assets and liabilities measured at fair value on a recurring basis as of June 30, 2015 and December 31, 2014:

			Fair Value Measurement Using
	Total Fair Value		(Level 1)		(Level 2)		(Level 3)
	(In thousands)
As of June 30, 2015:
Assets:
Investments in money market funds	$	113,416	$	113,416	$	—	$	—
Debt securities issued by the U.S. Treasury	1,697,434		1,697,434		—		—
Equity securities of public companies	89		89		—		—
Foreign currency forward contracts (1)	122		—		122		—
Total	$	1,811,061	$	1,810,939	$	122	$	—
Liabilities:
Contingent interest derivative on the Subordinated Convertible Debentures	$	25,841	$	—	$	—	$	25,841
Foreign currency forward contracts (2)	449		—		449		—
Total	$	26,290	$	—	$	449	$	25,841
As of December 31, 2014:
Assets:
Investments in money market funds	$	85,453	$	85,453	$	—	$	—
Debt securities issued by the U.S. Treasury	1,233,076		1,233,076		—		—
Foreign currency forward contracts (1)	330		—		330		—
Total	$	1,318,859	$	1,318,529	$	330	$	—
Liabilities:
Contingent interest derivative on the Subordinated Convertible Debentures	$	26,755	$	—	$	—	$	26,755
Foreign currency forward contracts (2)	169		—		169		—
Total	$	26,924	$	—	$	169	$	26,755

(1) Included in Other current assets

(2) Included in Accounts payable and accrued liabilities

Changes In Fair Value Measurement Of Level 3 Items

The following table summarizes the change in the fair value of the Company’s contingent interest derivative on the Subordinated Convertible Debentures during the three and six months ended June 30, 2015 and 2014:

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
	(In thousands)
Beginning balance	$	28,549		$	23,735		$	26,755		$	29,004
Payment of contingent interest	—			—			(5,225		)	—
Unrealized (gain) loss	(2,708		)	(5,246		)	4,311			(10,515		)
Ending balance	$	25,841		$	18,489		$	25,841		$	18,489