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Fair Value Of Financial Instruments
6 Months Ended
Jun. 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 June 30, 2015 and December 31, 2014:
 
 
 
Fair Value Measurement Using
 
Total Fair Value
 
(Level 1)
 
(Level 2)
 
(Level 3)
 
(In thousands)
As of June 30, 2015:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Investments in money market funds
$
113,416

 
$
113,416

 
$

 
$

Debt securities issued by the U.S. Treasury
1,697,434

 
1,697,434

 

 

Equity securities of public companies
89

 
89

 

 

Foreign currency forward contracts (1)
122

 

 
122

 

Total
$
1,811,061

 
$
1,810,939

 
$
122

 
$

Liabilities:
 
 
 
 
 
 
 
Contingent interest derivative on the Subordinated Convertible Debentures
$
25,841

 
$

 
$

 
$
25,841

Foreign currency forward contracts (2)
449

 

 
449

 

Total
$
26,290

 
$

 
$
449

 
$
25,841

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 June 30, 2015, the valuation of the contingent interest derivative assumed a volatility rate of approximately 28%. A hypothetical 5% increase or decrease in the volatility rate would not significantly change the fair value of the contingent interest derivative. The credit spread assumed in the valuation was approximately 4% at June 30, 2015. A hypothetical 1% increase or decrease in the credit spread would not significantly change the fair value of the contingent interest derivative.

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, 2015 and 2014:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
 
(In thousands)
Beginning balance
$
28,549

 
$
23,735

 
$
26,755

 
$
29,004

Payment of contingent interest

 

 
(5,225
)
 

Unrealized (gain) loss
(2,708
)
 
(5,246
)
 
4,311

 
(10,515
)
Ending balance
$
25,841

 
$
18,489

 
$
25,841

 
$
18,489



On February 15, 2015, the Company paid contingent interest of $5.2 million in addition to the normal coupon interest to holders of record of the Subordinated Convertible Debentures as of February 1, 2015. In February 2015, the upside trigger on the Subordinated Convertible Debentures was met for the six month interest period from February 15, 2015 through August 15, 2015. The $5.5 million contingent interest payable in August 2015 is included in the balance of the contingent interest derivative on the Subordinated Convertible Debentures as of June 30, 2015.
Other
The Company’s other financial instruments include cash, accounts receivable, restricted cash, and accounts payable. As of June 30, 2015, the carrying value of these financial instruments approximated their fair value. The fair value of the Company’s Subordinated Convertible Debentures was $2.3 billion as of June 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 $721.9 million and $498.8 million, respectively, as of June 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.