Investments in Available-for-Sale Securities (Tables)

9 Months Ended

Sep. 30, 2019

Debt Securities, Available-for-sale [Abstract]

Available-for-sale Securities

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

	September 30, 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	$	64,930	$	52	$	(17	)	$	64,965	$	64,965	$	—
Corporate notes and bonds	110,917		275		(101		)	111,091		111,091		—
Total Investments	$	175,847	$	327	$	(118	)	$	176,056	$	176,056	$	—

	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	$	—