Investments (Tables)

3 Months Ended

Mar. 31, 2017

Investments

Schedule of available-for-sale investments at fair value

	March 31, 2017
			Gross		Gross		Estimated
			Unrealized		Unrealized		Fair
	Cost		(Losses)		Gain		Value
	(In thousands)
Short-term investments – corporate bonds	$	4,477	$	(1)	$	—	$	4,476
Short-term investments – municipal bonds		7,092		(1)		1		7,092
Total short-term investments		11,569		(2)		1		11,568
Total investments	$	11,569	$	(2)	$	1	$	11,568

	December 31, 2016
			Gross		Gross		Estimated
			Unrealized		Unrealized		Fair
	Cost		(Losses)		Gains		Value
	(In thousands)
Short-term investments – corporate bonds	$	19,740	$	(11)	$	—	$	19,729
Short-term investments – municipal bonds		8,624		(6)		—		8,618
Total short-term investments		28,364		(17)		—		28,347
Total investments	$	28,364	$	(17)	$	—	$	28,347