Stock Compensation Plans (SSAR Activity) (Details) (Stock Appreciation Rights (SARs) [Member], USD $)	3 Months Ended
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding [Roll Forward]
SSARs Outstanding, Beginning of Period, shares	1,220,824
SSARs granted, shares	325,200
SSARs exercised, shares	(26,750)
SSARs canceled or forfeited, shares	(83,400)
SSARs Outstanding, End of Period, shares	1,435,874
SSAR price ranges per share:
Granted, dollars per share	$ 43.88
Canceled or forfeited, dollars per share	$ 56.98
Weighted average SSAR exercise prices per share:
Granted, dollars per share	$ 43.88
Exercised, dollars per share	$ 24.91
Canceled or forfeited, dollars per share	$ 56.98
Outstanding, dollars per share	$ 48.94
Minimum [Member]
SSAR price ranges per share:
Exercised, dollars per share	$ 21.45
Maximum [Member]
SSAR price ranges per share:
Exercised, dollars per share	$ 33.65

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- Definition

Share based compensation shares authorized under stock settled stock appreciation rights exercise price range exercised in period.

+ References

No definition available.

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- Definition

Share based compensation shares authorized under stock settled stock appreciation rights exercise price range forfeited or canceled in period

+ References

No definition available.

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- Definition

Share based compensation shares authorized under stock settled stock appreciation rights exercise price range grants in period.

+ References

No definition available.

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- Definition

Share based compensation shares authorized under stock settled stock appreciation rights plan weighted average exercise price range per share exercised in period.

+ References

No definition available.

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- Definition

Share based compensation shares authorized under stock settled stock appreciation rights plan weighted average exercise price per share exercised in period.

+ References

No definition available.

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- Definition

Share based compensation shares authorized under stock settled stock appreciation rights plan weighted average exercise price per share grants in period.

+ References

No definition available.

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- Definition

Share based compensation shares authorized under stock settled stock appreciation rights plan weighted average exercise price range per share outstanding.

+ References

No definition available.

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- Definition

Number of non-option equity instruments exercised by participants.

+ References

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- Definition

Number of shares under non-option equity instrument agreements that were either cancelled or expired.

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- Definition

Net number of non-option equity instruments granted to participants.

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ 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 (c)(1)(i)

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(ii)

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

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