Cash and Cash Equivalents, Short-Term Investments, and Restricted Cash Equivalents and Investments

12 Months Ended

Dec. 31, 2011

Cash and Cash Equivalents, Short-Term Investments, and Restricted Cash Equivalents and Investments

Note 5. Cash and Cash Equivalents, Short-Term Investments, and Restricted Cash Equivalents and Investments

Cash and cash equivalents, short-term investments, and restricted cash equivalents and investments as of December 31, 2011 consist of the following (in thousands):

	Amortized Cost		Estimated Fair Value
Cash and cash equivalents:
Cash	$	79,092	$	79,092
Money market mutual funds		6,544		6,544
Corporate notes and bonds		20,697		20,697
Total cash and cash equivalents		106,333		106,333
Short-term investments:
Corporate notes and bonds		39,309		39,254
U.S. Government agency securities		39,413		39,485
Total short-term investments		78,722		78,739
Total cash, cash equivalents, and short-term investments	$	185,055	$	185,072
Restricted cash equivalents and investments	$	10,168	$	10,168

Cash and cash equivalents, short-term investments, and restricted cash equivalents and investments as of December 31, 2010 consist of the following (in thousands):

	Amortized Cost		Estimated Fair Value
Cash and cash equivalents:
Cash	$	66,986	$	66,986
Money market mutual funds		44,348		44,348
Corporate notes and bonds		120,984		120,984
U.S. Government agency securities		3,700		3,700
Total cash and cash equivalents		236,018		236,018
Short-term investments:
Corporate notes and bonds		75,962		76,157
U.S. Government agency securities		22,126		22,146
Total short-term investments		98,088		98,303
Total cash, cash equivalents, and short-term investments	$	334,106	$	334,321
Restricted cash equivalents and investments	$	10,000	$	10,000

At December 31, 2011 and 2010, restricted cash equivalents and investments represent cash equivalents and short-term investments pledged as collateral against a letter of credit in connection with lease agreements.

Realized gains or losses on sales of available-for-sale securities for 2011, 2010, and 2009 were not significant.

Gross unrealized gains and gross unrealized losses on short-term investment securities at both December 31, 2011 and 2010 were not significant.

The contractual maturities of short-term investments at December 31, 2011 are as follows (in thousands):

	Amortized Cost		Estimated Fair  Value
Within one year	$	37,389	$	37,400
Between one year and five years		41,333		41,339
Total short-term investments	$	78,722	$	78,739