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Pension, Savings, and Other Employee Benefits - Schedule Of Components Of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 41 | $ 37 | $ 39
Interest cost | 27,877 | 29,380 | 31,216
Expected return on plan assets | (32,897) | (36,015) | (39,123)
Prior service cost/(credit) | 0 | 52 | 196
Actuarial (gain)/loss | (12,102) | (9,521) | (8,141)
Net periodic benefit cost | 7,123 | 2,975 | 469
ASC 715 settlement expense | 0 | 43 | 0
Total periodic benefit costs | 7,123 | 3,018 | 469
Other Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 133 | 107 | 110
Interest cost | 1,309 | 1,305 | 1,292
Expected return on plan assets | (1,074) | (947) | (913)
Prior service cost/(credit) | 0 | 95 | 170
Actuarial (gain)/loss | 387 | 567 | 810
Net periodic benefit cost | (19) | (7) | (151)
ASC 715 settlement expense | 99 | 0 | 0
Total periodic benefit costs | $ 80 | $ (7) | $ (151)

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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