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Pension, Savings, and Other Employee Benefits - Funded (Unfunded) Status of Plan (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | $ 36,267 | $ 40,878
Funded status of the plans | (34,356) | (29,640)
Other Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | 32,098 | 36,063
Funded status of the plans | (17,742) | (20,809)
Qualified pension | Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Funded status of the plans | $ 1,900 | $ 11,200

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