Pension, Savings, And Other Employee Benefits - Schedule Of Components Of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8	$ 7	$ 24	$ 23
Interest cost	5,844	7,505	17,663	22,655
Expected return on plan assets	(7,000)	(9,335)	(19,337)	(27,681)
Prior service cost (credit)	0	0	0	0
Actuarial (gain) loss	3,381	2,546	9,829	7,416
Net periodic benefit cost (credit)	2,233	723	8,179	2,413
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	25	23	74	71
Interest cost	304	358	915	1,060
Expected return on plan assets	(325)	(314)	(947)	(852)
Prior service cost (credit)	8	0	24	0
Actuarial (gain) loss	(64)	(112)	(218)	(346)
Net periodic benefit cost (credit)	$ (52)	$ (45)	$ (152)	$ (67)