Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2015

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)	June 30, 2015		December 31, 2014		June 30, 2014
U.S. Government and agency obligations	$	7,573	$	10,511	$	7,906
Commercial paper	9,987		14,993		19,992
Total short-term marketable securities	17,560		25,504		27,898
U.S. Government and agency obligations	70,508		76,563		84,234
Total long-term marketable securities	70,508		76,563		84,234
Total marketable securities	$	88,068	$	102,067	$	112,132

Held-to-maturity Securities

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

(in thousands)	June 30, 2015
Due within one year	$	17,560
Due in one to five years	70,508
Total	$	88,068