Pension, Savings, and Other Employee Benefits - Funded (Unfunded) Status of Plan (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 37,237	$ 36,267
Funded status of the plans	(9,804)	(34,356)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	39,131	32,098
Funded status of the plans	(21,891)	(17,742)
Qualified pension | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Funded status of the plans	$ 27,400	$ 1,900