Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2020

Defined Benefit Plan [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 June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Service cost	$	1,353	$	1,345	$	2,706	$	2,691
Interest cost	3,356		4,344		6,713		8,687
Expected return on plan assets	(5,648)		(6,100)		(11,296)		(12,200)
Prior service cost	—		7		—		13
Net loss (gain)	2,093		940		4,186		1,881
Net periodic benefit cost	$	1,154	$	536	$	2,309	$	1,072

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 June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Service cost	$	514	$	454	$	1,028	$	908
Interest cost	413		563		825		1,123
Expected return on plan assets	(46)		(58)		(91)		(115)
Prior service (benefit)	(137)		(100)		(274)		(199)
Net loss (gain)	5		—		10		—
Net periodic benefit cost	$	749	$	859	$	1,498	$	1,717

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 June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Service cost	$	1,817	$	692	$	447	$	1,977
Interest cost	275		324		550		648
Prior service cost	—		1		—		1
Net loss (gain)	426		134		852		268
Net periodic benefit cost	$	2,518	$	1,151	$	1,849	$	2,894

Schedule of Defined Benefit Plans Contributions

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

	Contributions Made		Additional Contributions		Contributions
	Six Months Ended June 30, 2020		Anticipated for 2020		Anticipated for 2021
Defined Benefit Pension Plan	$	12,700	$	—	$	12,700
Non-pension Defined Benefit Postretirement Healthcare Plans	$	2,670	$	2,671	$	5,364
Supplemental Non-qualified Defined Benefit and Defined Contribution Plans	$	710	$	710	$	1,614