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Fair Value Measurements Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2013
Fair Value Disclosures [Abstract]  
Schedule Of Fair Value Of Financial Assets Measured On A Recurring Basis
The following table sets forth the fair value of our financial assets that were measured and recorded on a recurring basis as of December 31, 2013 and 2012. We did not have any Level 3 investments during the periods presented. The amounts presented exclude cash, but include investments classified as cash equivalents (in thousands):
 
December 31, 2013
 
Level 1
 
Level 2
 
Total
Money market funds
$
24,813

 
$

 
$
24,813

Commercial paper

 
94,682

 
94,682

Corporate bonds

 
240,072

 
240,072

U.S. Treasury and government sponsored enterprises

 
44,386

 
44,386

Municipal bonds

 
6,013

 
6,013

Total
$
24,813

 
$
385,153

 
$
409,966

 
December 31, 2012
 
Level 1
 
Level 2
 
Total
Money market funds
$
76,050

 
$

 
$
76,050

Commercial paper

 
167,231

 
167,231

Corporate bonds

 
221,949

 
221,949

U.S. Treasury and government sponsored enterprises

 
132,991

 
132,991

Municipal bonds

 
30,044

 
30,044

Total
$
76,050

 
$
552,215

 
$
628,265

Schedule Of Estimated Fair Value Of Outstanding Debt
The estimated fair value of our financial instruments that are carried at amortized cost for which it is practicable to determine a fair value was as follows (in thousands):
 
December 31, 2013
 
December 31, 2012
 
Carrying
Amount
 
Fair Value
 
Carrying
Amount
 
Fair Value
2019 Notes
$
165,296

 
$
339,883

 
$
149,800

 
$
280,111

Silicon Valley Bank Term Loan
$
80,000

 
$
79,946

 
$
80,000

 
$
79,542

Silicon Valley Bank Line of Credit
$
2,090

 
$
2,090

 
$
5,260

 
$
5,253