Employee Benefit Plans And Other Postretirement Benefits (Schedule Of Reconciliation Of The Fair Value Measurements Using Significant Unobservable Inputs) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Pension Plan Assets [Member]
Change in plan assets:
Fair value of plan assets, beginning of period	$ 1,992,646
Fair value of plan assets, end of period		$ 1,992,646
Pension Plan Assets [Member] \| Equity Securities, Private Equity/Real Estate [Member]
Change in plan assets:
Fair value of plan assets, beginning of period	31,227
Fair value of plan assets, end of period		31,227
Postretirement Healthcare Benefits [Member]
Change in plan assets:
Fair value of plan assets, beginning of period	156,840	147,875
Fair value of plan assets, end of period	156,765	156,840
Postretirement Healthcare Benefits [Member] \| Equity Securities, Private Equity/Real Estate [Member]
Change in plan assets:
Fair value of plan assets, beginning of period	3,884
Fair value of plan assets, end of period	4,902	3,884
Significant Unobservable Inputs (Level 3) [Member] \| Pension Plan Assets [Member]
Change in plan assets:
Fair value of plan assets, beginning of period	31,086
Fair value of plan assets, end of period	23,332	31,086
Significant Unobservable Inputs (Level 3) [Member] \| Pension Plan Assets [Member] \| Equity Securities, Private Equity/Real Estate [Member]
Change in plan assets:
Fair value of plan assets, beginning of period	31,086	34,234
Relating to assets still held at the reporting date	2,375	(3,178)
Purchases, sales and settlements	(10,129)	30
Fair value of plan assets, end of period	23,332	31,086
Significant Unobservable Inputs (Level 3) [Member] \| Postretirement Healthcare Benefits [Member]
Change in plan assets:
Fair value of plan assets, beginning of period	3,869
Fair value of plan assets, end of period	4,891	3,869
Significant Unobservable Inputs (Level 3) [Member] \| Postretirement Healthcare Benefits [Member] \| Equity Securities, Private Equity/Real Estate [Member]
Change in plan assets:
Fair value of plan assets, beginning of period	3,869	0
Relating to assets still held at the reporting date	1,362	(178)
Purchases, sales and settlements	(340)	4,047
Fair value of plan assets, end of period	$ 4,891	$ 3,869

Actual return on plan assets, separately identifying the amount related to assets still held at the reporting date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(02)(A)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(iv)(02)(A)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

Amount of increase (decrease) in plan assets from purchases, sales and settlement of plan obligations.

+ 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 (d)(iv)(02)(B)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(iv)(02)(B)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920

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