Marketable Securities (Tables)

9 Months Ended

Sep. 30, 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)	September 30, 2014		December 31, 2013		September 30, 2013
U.S. Government and agency obligations	$	12,967	$	10,000	$	1,260
Commercial paper	14,983		39,968		19,982
Municipal bonds	—		—		1,650
Total short-term marketable securities	27,950		49,968		22,892
U.S. Government and agency obligations	74,140		67,234		64,014
Total long-term marketable securities	74,140		67,234		64,014
Total marketable securities	$	102,090	$	117,202	$	86,906

Held-to-maturity Securities

Scheduled maturities of held-to-maturity investments were as follows:

(in thousands)	September 30, 2014
Due within one year	$	27,950
Due in one to five years	74,140
Total	$	102,090