Stock-Based Compensation Plans (Schedule Of Other Data For Stock Options, Stock Awards And PSUs) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2015 USD ($)
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation related to nonvested options, stock awards and PSU's at end of year	$ 18,421
Weighted average period over which unrecognized compensation cost of nonvested options, stock awards and PSU's to be recognized (years)	2 years 4 months 24 days
Actual income tax benefit realized from options exercised or stock awards and PSU's vested	$ 16,786
Aggregate intrinsic value of stock options, stock awards and PSUs vested and expected to vest	82,056
Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation related to nonvested options, stock awards and PSU's at end of year	$ 3,849
Weighted average period over which unrecognized compensation cost of nonvested options, stock awards and PSU's to be recognized (years)	2 years 1 month 6 days
Actual income tax benefit realized from options exercised or stock awards and PSU's vested	$ 3,667
Aggregate intrinsic value of stock options, stock awards and PSUs vested and expected to vest	14,586
PSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation related to nonvested options, stock awards and PSU's at end of year	$ 3,515
Weighted average period over which unrecognized compensation cost of nonvested options, stock awards and PSU's to be recognized (years)	1 year 8 months 12 days
Actual income tax benefit realized from options exercised or stock awards and PSU's vested	$ 2,397
Aggregate intrinsic value of stock options, stock awards and PSUs vested and expected to vest	$ 19,160

Unrecognized cost of unvested share-based compensation awards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (j)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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