Pension, Savings, And Other Employee Benefits - Schedule Of Components Of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8	$ 8	$ 16	$ 16
Interest cost	5,910	7,575	11,819	15,150
Expected return on plan assets	(6,169)	(9,173)	(12,337)	(18,346)
Prior service cost/(credit)	0	0	0	0
Actuarial (gain)/loss	3,224	2,435	6,448	4,870
Net periodic benefit cost/(credit)	2,973	845	5,946	1,690
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	24	24	49	48
Interest cost	307	351	611	702
Expected return on plan assets	(311)	(269)	(622)	(538)
Prior service cost/(credit)	8	0	16	0
Actuarial (gain)/loss	(79)	(117)	(154)	(234)
Net periodic benefit cost/(credit)	$ (51)	$ (11)	$ (100)	$ (22)