Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2020

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

The components of net periodic benefit cost for the Defined Benefit Pension Plan were as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Service cost	$	1,352	$	1,346	$	4,058	$	4,037
Interest cost	3,356		4,344		10,069		13,031
Expected return on plan assets	(5,647)		(6,100)		(16,943)		(18,300)
Prior service cost (benefit)	—		6		—		19
Net loss (gain)	2,093		941		6,279		2,822
Net periodic benefit cost	$	1,154	$	537	$	3,463	$	1,609

Defined Benefit Postretirement Healthcare Plan

The components of net periodic benefit cost for the Defined Benefit Postretirement Healthcare Plan were as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Service cost	$	514	$	454	$	1,542	$	1,362
Interest cost	412		560		1,237		1,683
Expected return on plan assets	(46)		(57)		(137)		(172)
Prior service cost (benefit)	(136)		(99)		(410)		(298)
Net loss (gain)	5		—		15		—
Net periodic benefit cost	$	749	$	858	$	2,247	$	2,575

Supplemental Non-qualified Defined Benefit and Defined Contribution Plans

The components of net periodic benefit cost for the Supplemental Non-qualified Defined Benefit and Defined Contribution Plans were as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Service cost	$	1,035	$	429	$	1,482	$	2,406
Interest cost	274		324		824		972
Prior service cost (benefit)	1		—		1		1
Net loss (gain)	425		134		1,277		402
Net periodic benefit cost	$	1,735	$	887	$	3,584	$	3,781

Schedule of Defined Benefit Plans Contributions

Contributions made in the first nine months of 2020 and anticipated contributions for 2020 and 2021 are as follows (in thousands):

	Contributions Made		Additional Contributions		Contributions
	Nine Months Ended September 30, 2020		Anticipated for 2020		Anticipated for 2021
Defined Benefit Pension Plan	$	12,700	$	—	$	12,700
Non-pension Defined Benefit Postretirement Healthcare Plans	$	4,006	$	1,335	$	5,227
Supplemental Non-qualified Defined Benefit and Defined Contribution Plans	$	1,065	$	355	$	1,964