Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2019

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 March 31,
	2019			2018
Service cost	$	1,346		$	1,708
Interest cost	4,343			3,867
Expected return on plan assets	(6,100		)	(6,185		)
Prior service cost	6			15
Net loss (gain)	941			2,158
Net periodic benefit cost	$	536		$	1,563

Defined Benefit Postretirement Healthcare Plans

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

	Three Months Ended March 31,
	2019			2018
Service cost	$	454		$	573
Interest cost	560			521
Expected return on plan assets	(57		)	(57		)
Prior service cost (benefit)	(99		)	(99		)
Net loss (gain)	—			54
Net periodic benefit cost	$	858		$	992

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 March 31,
	2019		2018
Service cost (a)	$	1,285	$	280
Interest cost	324		293
Net loss (gain)	134		250
Net periodic benefit cost	$	1,743	$	823

Schedule of Defined Benefit Plans Contributions

Contributions made in 2019 and anticipated contributions for 2019 and 2020 are as follows (in thousands):

	Contributions Made		Additional Contributions		Contributions
	Three Months Ended March 31, 2019		Anticipated for 2019		Anticipated for 2020
Defined Benefit Pension Plan	$	—	$	12,700	$	12,700
Non-pension Defined Benefit Postretirement Healthcare Plans	$	1,109	$	3,326	$	4,271
Supplemental Non-qualified Defined Benefit and Defined Contribution Plans	$	366	$	1,097	$	1,562