Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2020

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 June 30,						Three months ended June 30,
	2020			2019			2020		2019
Components of net periodic benefit cost:
Service cost	$	1,919		$	1,914		$	—	$	—
Interest cost		3,949			4,040			10		13
Expected return on plan assets		(5,735	)		(5,254	)		—		—
Amortization of actuarial loss		425			41			9		7
Net periodic benefit cost	$	558		$	741		$	19	$	20

	Pension Benefits
	Pension Plan						SERP
	Six months ended June 30,						Six months ended June 30,
	2020			2019			2020		2019
Components of net periodic benefit cost:
Service cost	$	3,836		$	3,682		$	—	$	—
Interest cost		7,839			8,247			20		26
Expected return on plan assets		(11,923	)		(10,478	)		—		—
Amortization of actuarial loss		657			719			18		14
Net periodic benefit cost	$	409		$	2,170		$	38	$	40

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 June 30,						Six months ended June 30,
	2020			2019			2020			2019
Components of net periodic benefit cost:
Service cost	$	—		$	—		$	—		$	—
Interest cost		5			8			11			16
Amortization of actuarial gain		(130	)		(135	)		(261	)		(270	)
Net periodic benefit cost	$	(125	)	$	(127	)	$	(250	)	$	(254	)