Compensation Plan for Outside Directors (Tables)

12 Months Ended

Dec. 31, 2018

Compensation Related Costs [Abstract]

Summary of Total Accrued Compensation Cost Related to Outside Directors

	Year ended December 31,
	2018	2017	2016
	(In thousands)
Chairman Fee	$                 66	$                 66	$                 64
Adjustable Award	779	1,432	783
Non-adjustable Award	420	416	444
	$            1,265	$            1,914	$            1,291