Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2021

Retirement Benefits [Abstract]

Schedule Of Net Periodic Benefit Costs

The following table presents net periodic benefit (credit) / cost information relating to the Pension Plans combined:

	For the Three Months Ended				For the Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(In Thousands)				(In Thousands)
Components of net periodic benefit (credit) / cost:
Service cost	$	2,335	$	2,068	$	4,669	$	4,136
Interest cost	3,915		5,538		7,830		11,076
Expected return on plan assets	(10,454)		(9,445)		(20,908)		(18,890)
Amortization of prior service cost	736		919		1,472		1,838
Amortization of actuarial loss	1,382		2,028		2,764		4,057
Net periodic benefit (credit) / cost	$	(2,086)	$	1,108	$	(4,173)	$	2,217