Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2016

Marketable Securities [Abstract]

Schedule of Marketable Securities

All marketable securities were classified as held-to-maturity as of the dates presented and the carrying amounts of held-to-maturity securities were as follows:

(in thousands)	June 30, 2016		December 31, 2015		June 30, 2015
U.S. Government and agency obligations	$	20,010	$	15,051	$	7,573
Commercial paper	14,949		9,992		9,987
Total short-term marketable securities	34,959		25,043		17,560
U.S. Government and agency obligations	42,653		80,652		70,508
Total long-term marketable securities	42,653		80,652		70,508
Total marketable securities	$	77,612	$	105,695	$	88,068

Held-to-maturity Securities

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

(in thousands)	June 30, 2016
Due within one year	$	34,959
Due in one to five years	42,653
Total	$	77,612