Pension and Other Postretirement Plans (Tables)

9 Months Ended

Sep. 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			Nine Months Ended
	September 30,			September 30,
	2020		2019	2020	2019
	(In thousands)
Service cost	$	27	24	81	72
Interest cost	168		210	505	630
Expected return on plan assets	(315)		(271)	(946)	(815)
Amortization of prior service cost	—		—	—	—
Amortization of net loss	145		165	435	495
Net periodic benefit cost	$	25	128	75	382

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			Nine Months Ended
	September 30,			September 30,
	2020		2019	2020	2019
	(In thousands)
Service cost	$	302	126	907	377
Interest cost	337		256	1,012	768
Amortization of prior service cost	14		14	44	44
Amortization of net loss	1,446		348	4,336	1,044
Net periodic benefit cost	$	2,099	744	6,299	2,233

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			Nine Months Ended
	September 30,			September 30,
	2020		2019	2020	2019
	(In thousands)
Interest cost	$	41	49	124	148
Amortization of prior service cost	—		13	—	39
Amortization of net loss	40		61	119	183
Net periodic benefit cost	$	81	123	243	370