Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2012

Marketable Securities [Abstract]

Marketable Securities

The following tables summarize the investments in marketable securities all of which are classified as held to maturity:

	June 30, 2012				December 31, 2011
	Amortized Cost		Level  1(1) Fair Value		Amortized Cost		Level  1(1) Fair Value
Agency bonds	$	1,001	$	1,001	$	2,605	$	2,605
Certificate of deposit	900		900		900		899
Commercial paper	3,594		3,595		3,097		3,096
Corporate debentures/ bonds	5,417		5,414		4,596		4,591
Marketable securities	$	10,912	$	10,910	$	11,198	$	11,191

(1) Level 1 fair values are defined as observable inputs such as quoted prices in active markets.