Stock-Based Compensation (Activity Pertaining To Restricted Stock Awards) (Details) (USD $)					12 Months Ended
Dec. 31, 2011 Stock Options Plan [Member]	Dec. 31, 2010 Stock Options Plan [Member]	Dec. 31, 2009 Stock Options Plan [Member]	Dec. 31, 2008 Stock Options Plan [Member]	Dec. 31, 2011 Restricted Stock [Member]	Dec. 31, 2010 Restricted Stock [Member]	Dec. 31, 2009 Restricted Stock [Member]	Dec. 31, 2011 Stock Appreciation Rights (SARs) [Member]	Dec. 31, 2010 Stock Appreciation Rights (SARs) [Member]	Dec. 31, 2009 Stock Appreciation Rights (SARs) [Member]	Dec. 31, 2008 Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning Balance					446,125	507,071	617,148
Weighted Average Grant Date Price, Beginning Balance	$ 31.39	$ 31.11	$ 29.61	$ 29.68	$ 47.39	$ 47.46	$ 47.40	$ 46.59	$ 46.59	$ 46.59	$ 46.59
Number of Shares, Granted					211,050	450,355	0
Weighted Average Grant Date Price, Granted	$ 0.00	$ 0.00	$ 0.00		$ 55.91	$ 41.09	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Number of Shares, Vested					(190,262)	(496,497)	(68,836)
Weighted Average Grant Date Price, Vested					$ 43.32	$ 47.09	$ 46.18
Number of Shares, Forfeited					(18,952)	(14,804)	(41,241)
Weighted Average Grant Date Price, Forfeited					$ 44.55	$ 44.25	$ 48.69
Number of Shares, Ending Balance					447,961	446,125	507,071
Weighted Average Grant Date Price, Ending Balance	$ 31.39	$ 31.11	$ 29.61	$ 29.68	$ 47.44	$ 47.39	$ 47.46	$ 46.59	$ 46.59	$ 46.59	$ 46.59

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(a)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(b)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

+ Details

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- Definition

The weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period.

+ References

+ Details

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- Definition

The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

+ References

+ Details

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- Definition

The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

+ Details

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- Definition

As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

+ References

+ Details

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