Marketable Securities (Tables)

3 Months Ended

Mar. 31, 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)	March 31, 2017		December 31, 2016		March 31, 2016
U.S. Government and agency obligations	$	12,908	$	10,002	$	23,024
Commercial paper	54,916		54,882		19,977
Total short-term marketable securities	67,824		64,884		43,001
U.S. Government and agency obligations	59,989		62,895		72,653
Total long-term marketable securities	59,989		62,895		72,653
Total marketable securities	$	127,813	$	127,779	$	115,654

Held-to-maturity Securities

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

(in thousands)	March 31, 2017
Due within one year	$	67,824
Due in one to five years	59,989
Total	$	127,813