Marketable Securities

6 Months Ended

Jun. 30, 2012

Marketable Securities [Abstract]

Marketable Securities [Table Text Block]

Marketable Securities

All marketable securities were classified as held-to-maturity for the dates presented and the carrying amounts of held-to-maturity securities were as follows:

(in thousands)	June 30, 2012		December 31, 2011		June 30, 2011
U.S. Government and agency obligations	$	20,107	$	40,240	$	49,400
Commercial paper	14,967		24,980		19,986
Municipal bonds	3,065		2,057		5,685
Corporate bonds	5,121		3,131		3,184
Total short-term marketable securities	43,260		70,408		78,255
U.S. Government and agency obligations	40,041		65,109		40,144
Municipal bonds	5,759		8,909		4,091
Corporate bonds	—		5,232		5,345
Total long-term marketable securities	45,800		79,250		49,580
Total marketable securities	$	89,060	$	149,658	$	127,835

Scheduled maturities of held-to-maturity investments were as follows (in thousands):

June 30, 2012
Due within one year	$	43,260
Due in one to five years	45,800
Total	$	89,060