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Fair Value Of Financial Instruments
9 Months Ended
Sep. 30, 2015
Fair Value Disclosures [Abstract]  
Fair Value Of Financial Instruments
Fair Value of Financial Instruments
Assets and Liabilities Measured at Fair Value on a 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, 2015 and December 31, 2014:
 
 
 
Fair Value Measurement Using
 
Total Fair Value
 
(Level 1)
 
(Level 2)
 
(Level 3)
 
(In thousands)
As of September 30, 2015:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Investments in money market funds
$
113,223

 
$
113,223

 
$

 
$

Debt securities issued by the U.S. Treasury
1,712,986

 
1,712,986

 

 

Equity securities of public companies
101

 
101

 

 

Foreign currency forward contracts (1)
284

 

 
284

 

Total
$
1,826,594

 
$
1,826,310

 
$
284

 
$

Liabilities:
 
 
 
 
 
 
 
Contingent interest derivative on the Subordinated Convertible Debentures
$
25,054

 
$

 
$

 
$
25,054

Foreign currency forward contracts (2)
133

 

 
133

 

Total
$
25,187

 
$

 
$
133

 
$
25,054

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 the Subordinated Convertible Debentures
$
26,755

 
$

 
$

 
$
26,755

Foreign currency forward contracts (2)
169

 

 
169

 

Total
$
26,924

 
$

 
$
169

 
$
26,755

 
(1)
Included in Other current assets
(2)
Included in Accounts payable and accrued liabilities

The fair value of the Company’s investments in money market funds approximates their face value. Such instruments are classified as Level 1 and are included in Cash and cash equivalents.
The fair value of the debt securities consisting of U.S. Treasury bills is based on their quoted market prices and are classified as Level 1. Debt securities purchased with original maturities in excess of three months are included in Marketable securities.
The fair value of the equity securities of public companies is based on quoted market prices and are classified as Level 1. Investments in equity securities of public companies are included in Marketable securities.
The fair value of the Company’s foreign currency forward contracts is based on foreign currency rates quoted by banks or foreign currency dealers and other public data sources.
 
The Company utilizes a valuation model to estimate the fair value of the contingent interest derivative on the subordinated convertible debentures due 2037 (“the Subordinated Convertible Debentures”). The inputs to the model include stock price, bond price, risk free interest rates, volatility, and credit spread observations. As several significant inputs are not observable, the overall fair value measurement of the derivative is classified as Level 3. The volatility and credit spread assumptions used in the calculation are the most significant unobservable inputs. As of September 30, 2015, the valuation of the contingent interest derivative assumed a volatility rate of approximately 25% and a credit spread of approximately 5%. The fair value of the contingent interest derivative would not have significantly changed using a volatility rate of either 20% or 30%, or a credit spread of either 4% or 6%.

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, 2015 and 2014:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
 
(In thousands)
Beginning balance
$
25,841

 
$
18,489

 
$
26,755

 
$
29,004

Payment of contingent interest
(5,534
)
 

 
(10,759
)
 

Unrealized loss (gain)
4,747

 
6,562

 
9,058

 
(3,953
)
Ending balance
$
25,054

 
$
25,051

 
$
25,054

 
$
25,051



In August 2015, the upside trigger on the Subordinated Convertible Debentures was met for the six month interest period from August 15, 2015 through February 15, 2016. The $6.4 million contingent interest payable in February 2016 is included in the balance of the contingent interest derivative on the Subordinated Convertible Debentures as of September 30, 2015.
Other
The Company’s other financial instruments include cash, accounts receivable, restricted cash, and accounts payable. As of September 30, 2015, the carrying value of these financial instruments approximated their fair value. The fair value of the Company’s Subordinated Convertible Debentures was $2.6 billion as of September 30, 2015. The fair values of the senior notes due 2023 (the “2023 Senior Notes”) and the senior notes due 2025 (the “2025 Senior Notes”) were $734.1 million and $504.7 million, respectively, as of September 30, 2015. The fair values of these debt instruments are based on available market information from public data sources and are classified as Level 2.