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Employee Benefit Plans (Summary Of Status Of Plan) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | $ 4,750 | $ 77,743 | $ 10,534
Defined Benefit Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation at beginning of year | 300,244 | 316,202 |
Service cost | 8,255 | 9,801 | 10,949
Interest cost | 11,712 | 10,290 | 10,034
Actuarial (gain)/loss | 46,206 | (29,966) |
Curtailment |  |  |
Benefits paid | (11,062) | (6,084) |
Projected benefit obligation at end of year | 355,356 | 300,244 | 316,202
Fair value of plan assets at beginning of year | 260,531 | 210,267 |
Actual return on plan assets | 47,247 | (21,395) |
Actual contributions during the year | 4,750 | 77,743 |
Administrative expenses paid |  |  |
Benefits paid | (11,062) | (6,084) |
Fair value of plan assets at end of year | 301,467 | 260,531 | 210,267
Funded status at end of year | (53,889) | (39,713) |
Post-Retirement Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation at beginning of year | 28,483 | 34,717 |
Service cost | 983 | 1,312 | 1,570
Interest cost | 980 | 999 | 1,184
Amendments | (582) |  |
Actuarial (gain)/loss |  | (7,985) |
Benefits paid | (488) | (561) |
Projected benefit obligation at end of year | 29,376 | 28,483 | 34,717
Fair value of plan assets at beginning of year |  |  |
Actual contributions during the year | 488 | 561 |
Benefits paid | (488) | (561) |
Fair value of plan assets at end of year |  |  |
Funded status at end of year | $ (29,376) | $ (28,483) |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: 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=118257860&loc=d3e4179-114921 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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