Investments in Available-for-Sale Securities (Tables)

3 Months Ended

Mar. 31, 2019

Debt Securities, Available-for-sale [Abstract]

Available-for-sale Securities

The Company’s investments in available-for-sale marketable securities are as follows:

	March 31, 2019
										Balance Sheet
										Classification
			Gross Unrealized					Fair		Short-Term		Other
	Cost Basis		Gains		Losses			Value		Investments		Assets
	(In thousands)
Available-for-sale:
U.S. government and agency securities	$	94,586	$	58	$	(37	)	$	94,607	$	94,607	$	—
Corporate notes and bonds	70,044		98		(85		)	70,057		70,057		—
Total Investments	$	164,630	$	156	$	(122	)	$	164,664	$	164,664	$	—

	December 31, 2018
										Balance Sheet
										Classification
			Gross Unrealized					Fair		Short-Term		Other
	Cost Basis		Gains		Losses			Value		Investments		Assets
	(In thousands)
Available-for-sale:
U.S. government and agency securities	$	100,003	$	11	$	(126	)	$	99,888	$	99,888	$	—
Corporate notes and bonds	63,137		4		(232		)	62,909		62,909		—
Total Investments	$	163,140	$	15	$	(358	)	$	162,797	$	162,797	$	—