Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2017

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, 2017		December 31, 2016		June 30, 2016
U.S. Government and agency obligations	$	12,909	$	10,002	$	20,010
Commercial paper	34,912		54,882		14,949
Total short-term marketable securities	47,821		64,884		34,959
U.S. Government and agency obligations	59,990		62,895		42,653
Total long-term marketable securities	59,990		62,895		42,653
Total marketable securities	$	107,811	$	127,779	$	77,612

Held-to-maturity Securities

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

(in thousands)	June 30, 2017
Due within one year	$	47,821
Due in one to five years	59,990
Total	$	107,811