Pension, Savings, And Other Employee Benefits - Schedule Of Components Of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8	$ 8
Interest cost	5,909	7,575
Expected return on plan assets	(6,168)	(9,173)
Prior service cost/(credit)	0	0
Actuarial (gain)/loss	3,224	2,435
Net periodic benefit cost/(credit)	2,973	845
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	25	24
Interest cost	304	351
Expected return on plan assets	(311)	(269)
Prior service cost/(credit)	8	0
Actuarial (gain)/loss	(75)	(117)
Net periodic benefit cost/(credit)	$ (49)	$ (11)