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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 37 | $ 39 | $ 40
Interest cost | 29,380 | 31,216 | 36,424
Expected return on plan assets | (36,015) | (39,123) | (37,516)
Amortization of unrecognized, Prior service cost/(credit) | 52 | 196 | 333
Amortization of unrecognized, Actuarial (gain)/loss | 9,521 | 8,141 | 10,103
Net periodic benefit cost | 2,975 | 469 | 9,384
ASC 715 curtailment (income) | 0 | 0 | 0
ASC 715 settlement expense | 43 | 0 | 0
Total periodic benefit costs | 3,018 | 469 | 9,384
Other Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 107 | 110 | 146
Interest cost | 1,305 | 1,292 | 1,413
Expected return on plan assets | (947) | (913) | (956)
Amortization of unrecognized, Prior service cost/(credit) | 95 | 170 | (830)
Amortization of unrecognized, Actuarial (gain)/loss | (567) | (810) | (1,014)
Net periodic benefit cost | (7) | (151) | (1,241)
ASC 715 curtailment (income) | 0 | 0 | (8,283)
ASC 715 settlement expense | 0 | 0 | 0
Total periodic benefit costs | $ (7) | $ (151) | $ (9,524)

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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