Cash Equivalents and Restricted Securities

6 Months Ended

Jun. 30, 2011

Cash Equivalents and Restricted Securities

Cash Equivalents and Restricted Securities

3. Cash Equivalents and Restricted Securities

The following is a summary of cash equivalents and marketable securities (in thousands):

				Unrealized		Estimated
				Holding		Market
June 30, 2011		Cost Basis		Gains		Value
Cash equivalents:
U.S. Treasury money market funds	$	1,517	$	--	$	1,517
U.S. Treasury debt securities		3,800		--		3,800
Restricted securities:
Money market funds		319		--		319
U.S. Treasury debt securities		5,000		--		5,000
December 31, 2010
Cash equivalents:
U.S. Treasury money market funds	$	2,056	$	--	$	2,056
U.S. Treasury debt securities		14,099		--		14,099
Restricted securities:
Money market funds		309		--		309
U.S. Treasury debt securities		5,000		--		5,000

     As of June 30, 2011 and December 31, 2010 $319,000 and $309,000, respectively, of the Company's money market funds were designated as short-term restricted securities due to a contractual commitment to hold the securities as pledged collateral relating to international tax obligations. As of June 30, 2011 and December 31, 2010 $5.0 million of the Company's U.S. Treasury debt securities were designated as restricted securities due to a financial covenant requirement under the Company's credit agreement with General Electric Capital Corporation ("GE Capital") as discussed in Note 10.

     There were no material realized gains or losses on sales of available-for-sale securities in the six months ended June 30, 2011 and 2010. At June 30, 2011 $5.0 million of the Company's restricted securities had a maturity date within three months and $319,000 of restricted securities had a maturity date of between three months and one year. As of December 31, 2010 $5.3 million of the Company's restricted securities had a maturity date within three months.