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Pension, Savings, And Other Employee Benefits (Schedule of Expected Benefit Payment) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |
Exercise of stock options | $ 6,132 | $ 22,479 | $ 7,219
Pension Benefits |  |  |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |
2018 | 36,117 |  |
2019 | 38,554 |  |
2020 | 40,784 |  |
2021 | 42,536 |  |
2022 | 43,381 |  |
2023-2027 | 234,305 |  |
Other Benefits |  |  |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |
2018 | 2,543 |  |
2019 | 1,590 |  |
2020 | 1,647 |  |
2021 | 1,710 |  |
2022 | 1,775 |  |
2023-2027 | $ 9,963 |  |

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- Definition Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year. + 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 (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year. + 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 (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in fifth fiscal year following latest fiscal year. + 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 (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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