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Short-term Investments
9 Months Ended
Sep. 30, 2011
Investments, Debt and Equity Securities [Abstract] 
Short-term Investments
Short-term Investments:
The Company’s short-term investments consist of securities classified as available-for-sale, which are stated at fair value. The securities include U.S. Treasury securities with an original maturity of over 90 days. Unrealized gains, net of related income taxes, for available-for-sale securities are reported in accumulated other comprehensive income (loss), a component of stockholders’ equity, until realized. The estimated fair values of investments are based on quoted market prices as of the end of the reporting period. The U.S. Treasury securities reported as of September 30, 2011 have contractual maturities of less than one year.
Short-term investments, with an original maturity of over 90 days, consisted of the following (in thousands):
 
 
As of September 30, 2011
 
 
Amortized
Cost
 
Unrealized
Gain in
Accumulated
OCI
 
Unrealized
Loss in
Accumulated
OCI
 
Aggregate
Fair
Value
Equity securities
 
$
7

 
$
—

 
$
(6
)
 
$
1

U.S. Treasury securities
 
299,910

 
70

 
—

 
299,980

Total short-term investments
 
$
299,917

 
$
70

 
$
(6
)
 
$
299,981

 
 
 
As of December 31, 2010
 
 
Amortized
Cost
 
Unrealized
Gain in
Accumulated
OCI
 
Unrealized
Loss in
Accumulated
OCI
 
Aggregate
Fair
Value
Equity securities
 
$
7

 
$
—

 
$
(6
)
 
$
1

U.S. Treasury securities
 
374,681

 
180

 
—

 
374,861

Total short-term investments
 
$
374,688

 
$
180

 
$
(6
)
 
$
374,862