Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2014

Marketable Securities [Abstract]

Schedule of 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)	March 31, 2014		December 31, 2013		March 31, 2013
U.S. Government and agency obligations	$	6,157	$	10,000	$	6,169
Commercial paper	34,986		39,968		29,976
Municipal bonds	—		—		8,696
Total short-term marketable securities	41,143		49,968		44,841
U.S. Government and agency obligations	65,969		67,234		57,958
Total long-term marketable securities	65,969		67,234		57,958
Total marketable securities	$	107,112	$	117,202	$	102,799

Held-to-maturity Securities

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

March 31, 2014
Due within one year	$	41,143
Due in one to five years	65,969
Total	$	107,112