Investments Available for Sale

9 Months Ended

Sep. 30, 2011

Investments Available for Sale

Investments Available for Sale

6.              Investments Available for Sale

Investments available for sale consisted of the following as of September 30, 2011 and December 31, 2010:

	September 30, 2011									December 31, 2010
	$000									$000
			Unrealized									Unrealized
	Cost		Gain		Loss			Fair Value		Cost		Gain		Loss			Fair Value
Cash equivalents:
Money market funds & certificates of deposit	$	807	$	—	$	—		$	807	$	10,299	$	1	$	—		$	10,300
Commercial paper	5,997		—		—			5,997		18,589		—		—			18,590
	6,804		—		—			6,804		28,889		1		—			28,889
Short term investments:
Municipal securities	5,280		—		(1		)	5,279
Corporate notes and bonds	36,744		22		(2		)	36,764		36,080		7		(12		)	36,076
U.S. & Foreign government agencies	1,604		3		—			1,607		1,200		1		—			1,201
	43,628		25		(3		)	43,650		37,280		8		(12		)	37,277
Investments available for sale	$	50,432	$	25	$	(3	)	$	50,454	$	66,169	$	9	$	(12	)	$	66,166

The following table summarizes maturities of our investments available for sale as of September 30, 2011 and December 31, 2010:

	September 30, 2011				December 31, 2010
	$000				$000
	Cost		Fair Value		Cost		Fair Value
Maturities:
Within 3-months	$	49,088	$	49,102	$	52,607	$	52,601
Between 3—12 months	—		—		4,870		4,870
Between 1—2 years	1,344		1,352		8,692		8,695
Investments available for sale	$	50,432	$	50,454	$	66,169	$	66,166

Realized gains and investment income earned on investments available for sale were $26,000 and $80,000, respectively,  for the three and nine months ended September 30, 2011, and have been included as a component of “Other income, net” in the accompanying financial statements.