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Fair Value Of Financial Instruments (Tables)
9 Months Ended
Sep. 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 September 30, 2016 and December 31, 2015:
 
 
 
Fair Value Measurement Using
 
Total Fair Value
 
(Level 1)
 
(Level 2)
 
(Level 3)
 
(In thousands)
As of September 30, 2016:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Investments in money market funds
$
155,055

 
$
155,055

 
$

 
$

Debt securities issued by the U.S. Treasury
1,577,537

 
1,577,537

 

 

Equity securities of public companies
$
2,389

 
$
2,389

 
$

 
$

Foreign currency forward contracts (1)
124

 

 
124

 

Total
$
1,735,105

 
$
1,734,981

 
$
124

 
$

Liabilities:
 
 
 
 
 
 
 
Contingent interest derivative on the Subordinated Convertible Debentures
$
14,330

 
$

 
$

 
$
14,330

Foreign currency forward contracts (2)
84

 

 
84

 

Total
$
14,414

 
$

 
$
84

 
$
14,330

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 nine months ended September 30, 2016 and 2015:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
 
(In thousands)
Beginning balance
$
22,611

 
$
25,841

 
$
30,126

 
$
26,755

Payment of contingent interest
(6,841
)
 
(5,534
)
 
(13,385
)
 
(10,759
)
Unrealized (gain) loss
(1,440
)
 
4,747

 
(2,411
)
 
9,058

Ending balance
$
14,330

 
$
25,054

 
$
14,330

 
$
25,054