Stock-Based Compensation (Schedule Of Stock Available For Future Grants) (Details) - shares	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Available for future grants (in shares)	8,774,768
LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Available for future grants (in shares)	8,774,768	9,385,674	11,769,796
Common stock, shares, issued (in shares)	1,679,547	1,511,645	708,059
TSOP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Available for future grants (in shares)	410,895	544,217	832,676
Common stock, shares, issued (in shares)	291,515	300,769	121,745

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Number of share instruments newly issued under a share-based compensation plan.

+ References

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