Marketable Securities

9 Months Ended

Sep. 30, 2013

Marketable Securities [Abstract]

Marketable Securities

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)	September 30, 2013		December 31, 2012		September 30, 2012
U.S. Government and agency obligations	$	1,260	$	7,375	$	15,062
Commercial paper	19,982		34,966		19,976
Municipal bonds	1,650		8,738		7,082
Corporate bonds	—		5,009		5,065
Total short-term marketable securities	22,892		56,088		47,185
U.S. Government and agency obligations	64,014		55,342		36,103
Municipal bonds	—		—		1,699
Total long-term marketable securities	64,014		55,342		37,802
Total marketable securities	$	86,906	$	111,430	$	84,987

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

September 30, 2013
Due within one year	$	22,892
Due in one to five years	64,014
Total	$	86,906