Marketable Securities

6 Months Ended

Jun. 30, 2013

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, 2013		December 31, 2012		June 30, 2012
U.S. Government and agency obligations	$	613	$	7,375	$	20,107
Commercial paper	14,992		34,966		14,967
Municipal bonds	5,666		8,738		3,065
Corporate bonds	—		5,009		5,121
Total short-term marketable securities	21,271		56,088		43,260
U.S. Government and agency obligations	55,225		55,342		40,041
Municipal bonds	—		—		5,759
Total long-term marketable securities	55,225		55,342		45,800
Total marketable securities	$	76,496	$	111,430	$	89,060

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

June 30, 2013
Due within one year	$	21,271
Due in one to five years	55,225
Total	$	76,496