Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2020

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,
	2020			2019
Components of net periodic benefit cost:
Service cost	$	—		$	—
Interest cost		6			8
Amortization of actuarial gain		(131	)		(135	)
Net periodic benefit cost	$	(125	)	$	(127	)

Pension Plan [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 Plan						SERP
	Three months ended March 31,						Three months ended March 31,
	2020			2019			2020		2019
Components of net periodic benefit cost:
Service cost	$	1,917		$	1,768		$	—	$	—
Interest cost		3,890			4,207			10		13
Expected return on plan assets		(6,188	)		(5,224	)		—		—
Amortization of actuarial loss		232			678			9		7
Net periodic benefit cost	$	(149	)	$	1,429		$	19	$	20