Pension and Other Postretirement Plans (Tables)

6 Months Ended

Jun. 30, 2020

Defined Benefit Pension Plans

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of net periodic benefit costs

The following table summarizes the components of net periodic benefit cost.

	Three Months Ended			Six Months Ended
	June 30,			June 30,
	2020		2019	2020	2019
	(In thousands)
Service cost	$	27	24	54	48
Interest cost	169		210	337	420
Expected return on plan assets	(316)		(272)	(631)	(544)
Amortization of prior service cost	—		—	—	—
Amortization of net loss	145		165	290	330
Net periodic benefit cost	$	25	127	50	254

Chairman and President Non-Qualified Defined Benefit Plans

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of net periodic benefit costs

The following table summarizes the components of net periodic benefit costs for the non-qualified defined benefit plans.

	Three Months Ended			Six Months Ended
	June 30,			June 30,
	2020		2019	2020	2019
	(In thousands)
Service cost	$	303	126	605	251
Interest cost	337		256	675	512
Amortization of prior service cost	15		15	30	30
Amortization of net loss	1,445		348	2,890	696
Net periodic benefit cost	$	2,100	745	4,200	1,489

Defined Benefit Postretirement Healthcare Plans

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of net periodic benefit costs

The following table summarizes the components of net periodic benefit costs.

	Three Months Ended			Six Months Ended
	June 30,			June 30,
	2020		2019	2020	2019
	(In thousands)
Interest cost	$	42	50	83	99
Amortization of prior service cost	—		13	—	26
Amortization of net loss	39		61	79	122
Net periodic benefit cost	$	81	124	162	247