Short-Term Investments (Tables)

6 Months Ended

Jun. 30, 2011

Short-Term Investments

Schedule of Available for Sale Investments

(in thousands)	Cost		Gross unrealized gains		Gross unrealized losses		Fair value
June 30, 2011
Debt securities:
U.S. Treasury	$	83,595	$	52	$	—	$	83,647
Corporate		44,175		28		5		44,198
	$	127,770	$	80	$	5	$	127,845
Maturities of investments were as follows:
Less than one year		94,689		73		2		94,760
Greater than one year		33,081		7		3		33,085
Total	$	127,770	$	80	$	5	$	127,845