Pension and Other Postretirement Plans (Tables)

9 Months Ended

Sep. 30, 2019

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,
	2019			2018		2019		2018
	(In thousands)
Service cost	$	24		28		72		84
Interest cost	210			225		630		675
Expected return on plan assets	(271		)	(325	)	(815	)	(975	)
Amortization of prior service cost	—			—		—		—
Amortization of net loss	165			131		495		393
Net periodic benefit cost	$	128		59		382		177

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,
	2019		2018	2019	2018
	(In thousands)
Service cost	$	126	90	377	270
Interest cost	256		213	768	639
Amortization of prior service cost	14		15	44	45
Amortization of net loss	348		176	1,044	528
Net periodic benefit cost	$	744	494	2,233	1,482

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,
	2019		2018	2019	2018
	(In thousands)
Interest cost	$	49	40	148	120
Amortization of prior service cost	13		26	39	78
Amortization of net loss	61		38	183	113
Net periodic benefit cost	$	123	104	370	311