Fair Value Of Financial Instruments (Tables)

12 Months Ended

Dec. 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 December 31, 2014 and December 31, 2013:

			Fair Value Measurement Using
	Total Fair Value		Level 1		Level 2		Level 3
	(In thousands)
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 Subordinated Convertible Debentures	$	26,755	$	—	$	—	$	26,755
Foreign currency forward contracts (2)	169		—		169		—
Total	$	26,924	$	—	$	169	$	26,755
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 Subordinated Convertible Debentures	$	29,004	$	—	$	—	$	29,004
Foreign currency forward contracts (2)	131		—		131		—
Total	$	29,135	$	—	$	131	$	29,004

(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 Subordinated Convertible Debentures during the year ended December 31, 2014 and 2013:

	Year Ended December 31,
	2014			2013
	(In thousands)
Beginning balance	$	29,004		$	11,203
Unrealized (gain) loss on contingent interest derivative on Subordinated Convertible Debentures	(2,249		)	17,801
Ending balance	$	26,755		$	29,004