Fair Value Of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2014

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 March 31, 2014 and December 31, 2013:

			Fair Value Measurement Using
	Total Fair Value		(Level 1)		(Level 2)		(Level 3)
	(In thousands)
As of March 31, 2014:
Assets:
Investments in money market funds	$	190,331	$	190,331	$	—	$	—
Debt securities issued by the U.S. Treasury	1,450,155		1,450,155		—		—
Foreign currency forward contracts (1)	90		—		90		—
Total	$	1,640,576	$	1,640,486	$	90	$	—
Liabilities:
Contingent interest derivative on the Subordinated Convertible Debentures	$	23,735	$	—	$	—	$	23,735
Foreign currency forward contracts (2)	216		—		216		—
Total	$	23,951	$	—	$	216	$	23,735
As of December 31, 2013:
Assets:
Investments in money market funds	$	246,492	$	246,492	$	—	$	—
Debt securities issued by the U.S. Treasury	1,409,062		1,409,062		—		—
Foreign currency forward contracts (1)	141		—		141		—
Total	$	1,655,695	$	1,655,554	$	141	$	—
Liabilities:
Contingent interest derivative on the Subordinated Convertible Debentures	$	29,004	$	—	$	—	$	29,004
Foreign currency forward contracts (2)	131		—		131		—
Total	$	29,135	$	—	$	131	$	29,004

(1) Included in Income tax receivables and 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 months ended March 31, 2014 and 2013:

	Three Months Ended March 31,
	2014			2013
	(In thousands)
Beginning balance	$	29,004		$	11,203
Unrealized (gain) loss	(5,269		)	6,433
Ending balance	$	23,735		$	17,636