Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2021

Pension Benefits [Member]

Defined Benefit Plan Disclosure [Line Items]

Net Periodic Benefit Cost

The components of net periodic benefit cost for the Company’s defined benefit plans were as follows (in thousands):

	Pension Benefits
	Pension Plans						SERP
	Three Months Ended March 31,						Three Months Ended March 31,
	2021			2020			2021		2020
Components of net periodic benefit cost:
Service cost	$	1,927		$	1,917		$	—	$	—
Interest cost		3,584			3,890			8		10
Expected return on plan assets		(6,574	)		(6,188	)		—		—
Amortization of actuarial loss		1,098			232			10		9
Net periodic benefit cost	$	35		$	(149	)	$	18	$	19

Other Postretirement Benefits [Member]

Defined Benefit Plan Disclosure [Line Items]

Net Periodic Benefit Cost

The components of net periodic benefit cost for the Company’s postretirement benefit plan were as follows (in thousands):

	Other Postretirement Benefits
	Postretirement Welfare Plan
	Three Months Ended March 31,
	2021			2020
Components of net periodic benefit cost:
Interest cost	$	4		$	6
Amortization of actuarial gain		(113	)		(131	)
Net periodic benefit cost	$	(109	)	$	(125	)