Investments in Available-for-Sale Securities (Tables)

9 Months Ended

Sep. 30, 2017

Available-for-sale Securities [Abstract]

Available-for-sale Securities

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

	September 30, 2017
										Balance Sheet
										Classification
			Gross Unrealized					Fair		Short-Term		Other
	Cost Basis		Gains		Losses			Value		Investments		Assets
	(In thousands)
Available-for-sale:
U.S. treasury securities	$	60,870	$	41	$	(15	)	$	60,896	$	60,896	$	—
Corporate notes and bonds	93,753		17		(37		)	93,733		93,733		—
Total Investments	$	154,623	$	58	$	(52	)	$	154,629	$	154,629	$	—

	December 31, 2016
										Balance Sheet
										Classification
			Gross Unrealized					Fair		Short-Term		Other
	Cost Basis		Gains		Losses			Value		Investments		Assets
	(In thousands)
Available-for-sale:
Corporate notes and bonds	$	88,161	$	—	$	(89	)	$	88,072	$	88,072	$	—
Equity securities	1,749		388		—			2,137		—		2,137
Total Investments	$	89,910	$	388	$	(89	)	$	90,209	$	88,072	$	2,137