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Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value of Financial Instruments 
Summary of the valuation of cash equivalents and marketable securities by pricing levels

 

 

 

 

As of September 30, 2011

 

 

 

Total

 

Quoted
Market
Prices in
Active
Markets
(Level 1)

 

Significant
Other
Observable
Inputs
(Level 2)

 

Significant
Unobservable
Inputs
(Level 3)

 

 

 

(In thousands)

 

Money market funds

 

$

132,721

 

$

132,721

 

$

 

$

 

U.S. government sponsored obligations

 

35,668

 

 

35,668

 

 

Corporate notes, bonds and commercial paper

 

96,241

 

 

96,241

 

 

Total available-for-sale securities

 

$

264,630

 

$

132,721

 

$

131,909

 

$

 

 

 

 

As of December 31, 2010

 

 

 

Total

 

Quoted
Market
Prices in
Active
Markets
(Level 1)

 

Significant
Other
Observable
Inputs
(Level 2)

 

Significant
Unobservable
Inputs
(Level 3)

 

 

 

(In thousands)

 

Money market funds

 

$

132,364

 

$

132,364

 

$

 

$

 

U.S. government sponsored obligations

 

266,817

 

48,604

 

218,213

 

 

Corporate notes, bonds and commercial paper

 

95,724

 

 

95,724

 

 

Total available-for-sale securities

 

$

494,905

 

$

180,968

 

$

313,937

 

$

 

Financial instruments that are measured and carried at cost on a nonrecurring basis

 

 

 

As of September 30, 2011

 

(in thousands)

 

Carrying
Value

 

Quoted
market
prices in
active
markets
(Level 1)

 

Significant
other
observable
inputs
(Level 2)

 

Significant
unobservable
inputs
(Level 3)

 

Impairment
charges for the
nine months
ended September
30, 2011

 

Investment in non-marketable security

 

$

2,000

 

$

 

$

 

$

2,000

 

$

 

 

 

 

As of December 31, 2010

 

(in thousands)

 

Carrying
Value

 

Quoted
market
prices in
active
markets
(Level 1)

 

Significant
other
observable
inputs
(Level 2)

 

Significant
unobservable
inputs
(Level 3)

 

Impairment
charges for the
year ended
December 31,
2010

 

Investment in non-marketable security

 

$

2,000

 

$

 

$

 

$

2,000

 

$

 

Financial instruments not carried at fair value but requiring fair value disclosure

 

 

 

 

As of September 30, 2011

 

As of December 31, 2010

 

(in thousands)

 

Face
Value

 

Carrying
Value

 

Fair Value

 

Face
Value

 

Carrying
Value

 

Fair Value

 

5% Convertible Senior Notes due 2014

 

$

172,500

 

$

130,354

 

$

191,632

 

$

172,500

 

$

121,500

 

$

224,504