Share-Based Compensation And Capital Stock Summary Of Activity Related To PVRSU Grants (Details) (Performance Vested Restricted Stock Units, USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Performance vested restricted stock units granted at target	25,036	33,517	9,588
Weighted average grant date fair value per share	$ 41.25	$ 32.60	$ 26.88
Aggregate grant date fair value ($000)	$ 1,033,000	$ 1,093,000	$ 258,000
Stock units forfeited	43,179	13,110	6,046
Remaining Stock Awards Forfeited Upon Employee Termination	4,109
Requisite service period	3 years	3 years	2 years
Achievement Percentage Of Stock Based Award Target Resulting In Zero Vesting	50.00%
Grants vested	0	10,880	19,761
Grant date fair value of shares vested		$ 400,000	$ 1,000,000
Grant, initial target		15,541	14,638
Stock Award Performance Percentage Target Achieved		70.00%	35.00%
Minimum [Member]
Vesting Range	0.00%
Vesting Percentage For Stock based Award Target Achievement	0.00%
Maximum [Member]
Vesting Range	200.00%
Vesting Percentage For Stock based Award Target Achievement	130.00%
Target Performance Not Met [Member]
Stock units forfeited		4,661
Target Performance Not Met Additional [Member]
Stock units forfeited	39,070	4,989
Remaining Stock Awards Forfeited Upon Employee Termination		3,460
Scenario, Forecast [Member]
Grants vested			5,123

Achievement Percentage Of Stock Based Award Target Resulting In Zero Vesting

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- Definition

Remaining stock awards forfeited upon employee termination

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Aggregate Grant Date Fair Value

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options, initial grants target subject to performance achievement.

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Stock Award Performance Percentage Target Achieved

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Vesting Percentage For Stock based Award Target Achievement

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Vesting Range

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- Definition

Description of the estimated period of time over which an employee is required to provide service in exchange for the equity-based payment award, which often is the vesting period. This period may be explicit or implicit based on the terms of the award, and may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).

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- Definition

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).

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued 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

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)(c)

-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 c(1)

-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)(iii)(1)

-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.

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- Definition

The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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