Fair Value Of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 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 June 30, 2016 and December 31, 2015:

			Fair Value Measurement Using
	Total Fair Value		(Level 1)		(Level 2)		(Level 3)
	(In thousands)
As of June 30, 2016:
Assets:
Investments in money market funds	$	141,209	$	141,209	$	—	$	—
Debt securities issued by the U.S. Treasury	1,733,258		1,733,258		—		—
Equity securities of public companies	$	2,772	$	2,772	$	—	$	—
Foreign currency forward contracts (1)	563		—		563		—
Total	$	1,877,802	$	1,877,239	$	563	$	—
Liabilities:
Contingent interest derivative on the Subordinated Convertible Debentures	$	22,611	$	—	$	—	$	22,611
Foreign currency forward contracts (2)	65		—		65		—
Total	$	22,676	$	—	$	65	$	22,611
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 (1)	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 (2)	164		—		164		—
Total	$	30,290	$	—	$	164	$	30,126

(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, 2016 and 2015:

	Three Months Ended June 30,					Six Months Ended June 30,
	2016		2015			2016			2015
	(In thousands)
Beginning balance	$	22,517	$	28,549		$	30,126		$	26,755
Payment of contingent interest	—		—			(6,544		)	(5,225		)
Unrealized loss (gain)	94		(2,708		)	(971		)	4,311
Ending balance	$	22,611	$	25,841		$	22,611		$	25,841