Share-Based Compensation Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Share-Based Compensation Plans (Textual) [Abstract]
Allocated Share-based Compensation Expense	$ 0.6	$ 1.7
Total unrecognized compensation cost	$ 8.0
Expected period to recognized, in years	1 year 10 months 24 days
Employee Stock Option [Member]
Issuance of new grants
Options exercisable	252,171
Weighted Average Exercise price	$ 33.15
Number of Units	926
Weighted Average Exercise Price	$ 20.80
SARs [Member]
Issuance of new grants
Weighted average fair value	$ 8.11
SARs Exercisable	65,019
Weighted Average Exercise price	$ 14.21
Number of Units	3,846
Weighted Average Exercise Price	$ 15.40
January 31, 2012 [Member]
Issuance of new grants
Grant Date	Jan. 02, 2013
January 31, 2012 [Member] \| Restricted Stock [Member]
Issuance of new grants
Restricted and Performance shares	1,805
Granted date fair value of Restricted and Performance shares	$ 25.20
January 31, 2012 [Member] \| Employee Stock Option [Member]
Issuance of new grants
Stock options	0
Grant date fair value of stock options	$ 0.00
January 31, 2012 [Member] \| Performance Shares [Member]
Issuance of new grants
Restricted and Performance shares	0
Granted date fair value of Restricted and Performance shares	$ 0.00
March 1, 2012 [Member]
Issuance of new grants
Grant Date	Jan. 22, 2013
March 1, 2012 [Member] \| Restricted Stock [Member]
Issuance of new grants
Restricted and Performance shares	47,994
Granted date fair value of Restricted and Performance shares	$ 23.90
March 1, 2012 [Member] \| Employee Stock Option [Member]
Issuance of new grants
Stock options	77,715
Grant date fair value of stock options	$ 14.77
March 1, 2012 [Member] \| Performance Shares [Member]
Issuance of new grants
Restricted and Performance shares	95,991
Granted date fair value of Restricted and Performance shares	$ 27.41
April 2, 2012
Issuance of new grants
Grant Date	Feb. 04, 2013
April 2, 2012 \| Restricted Stock [Member]
Issuance of new grants
Restricted and Performance shares	18,668
Granted date fair value of Restricted and Performance shares	$ 22.63
April 2, 2012 \| Employee Stock Option [Member]
Issuance of new grants
Stock options	17,692
Grant date fair value of stock options	$ 14.00
April 2, 2012 \| Performance Shares [Member]
Issuance of new grants
Restricted and Performance shares	21,828
Granted date fair value of Restricted and Performance shares	$ 25.96

Share based compensation arrangement by share based payment award grant date.

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- Definition

Share based compensation arrangement by share based payment award other than options exercisable number.

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award other than options exercisable weighted average exercise price.

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ 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 (h)(1)(i)

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

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph g(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 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-Subparagraph 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 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ References

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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

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 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

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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- Definition

Net number of share options (or share units) granted during the period.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

+ References

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- Definition

Number of share options (or share units) exercised during the current period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28,29)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

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