Fair Value Of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2016

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, 2016 and December 31, 2015:

			Fair Value Measurement Using
	Total Fair Value		(Level 1)		(Level 2)		(Level 3)
	(In thousands)
As of March 31, 2016:
Assets:
Investments in money market funds	$	107,614	$	107,614	$	—	$	—
Debt securities issued by the U.S. Treasury	1,750,611		1,750,611		—		—
Equity securities of public companies	1,181		1,181		—		—
Total	$	1,859,406	$	1,859,406	$	—	$	—
Liabilities:
Contingent interest derivative on the Subordinated Convertible Debentures	$	22,517	$	—	$	—	$	22,517
Foreign currency forward contracts (1)	496		—		496		—
Total	$	23,013	$	—	$	496	$	22,517
As of December 31, 2015:
Assets:
Investments in money market funds	$	137,593	$	137,593	$	—	$	—
Debt securities issued by the U.S. Treasury	1,685,882		1,685,882		—		—
Equity securities of public companies	890		890		—		—
Foreign currency forward contracts (2)	230		—		230		—
Total	$	1,824,595	$	1,824,365	$	230	$	—
Liabilities:
Contingent interest derivative on the Subordinated Convertible Debentures	$	30,126	$	—	$	—	$	30,126
Foreign currency forward contracts (1)	164		—		164		—
Total	$	30,290	$	—	$	164	$	30,126

(1) Included in Accounts payable and accrued liabilities

(2) Included in Other current assets

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, 2016 and 2015:

	Three Months Ended March 31,
	2016			2015
	(In thousands)
Beginning balance	$	30,126		$	26,755
Payment of contingent interest	(6,544		)	(5,225		)
Unrealized (gain) loss	(1,065		)	7,019
Ending balance	$	22,517		$	28,549