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Share-based Compensation Summary of Restricted Stock and Performance Unit Award Activity (Details)	9 Months Ended
	Sep. 30, 2015 $ / shares shares
Restricted Stock
Restricted stock and performance unit award activity (shares) [Roll Forward]
Outstanding at January 1, 2015	1,184,299
Granted	218,957
Vested	(349,903)
Forfeitures	(5,397)
Outstanding at September 30, 2015	1,047,956
Restricted stock and performance unit award activity (weighted average grant-date fair value) [Abstract]
Weighted average grant-date fair value of outstanding shares at January 1, 2015 | $ / shares	$ 41.71
Weighted average grant-date fair value of shares granted | $ / shares	65.16
Weighted average grant-date fair value of shares vested | $ / shares	29.41
Weighted average grant-date fair value of shares forfeitures | $ / shares	66.32
Weighted average grant-date fair value of outstanding shares at March 31, 2015 | $ / shares	$ 49.97
Performance Units
Restricted stock and performance unit award activity (shares) [Roll Forward]
Outstanding at January 1, 2015	127,489
Granted	53,102
Vested	0
Forfeitures	0
Outstanding at September 30, 2015	180,591
Restricted stock and performance unit award activity (weighted average grant-date fair value) [Abstract]
Weighted average grant-date fair value of outstanding shares at January 1, 2015 | $ / shares	$ 58.25
Weighted average grant-date fair value of shares granted | $ / shares	65.03
Weighted average grant-date fair value of shares vested | $ / shares	0.00
Weighted average grant-date fair value of shares forfeitures | $ / shares	0.00
Weighted average grant-date fair value of outstanding shares at March 31, 2015 | $ / shares	$ 60.24

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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 (c)(1)(iv)(3)



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

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ 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)(2)(iii)(3)



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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

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)(2)(iii)(1)



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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 Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (c)(2)(iii)(1)



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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 Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



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



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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.

+ 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)(2)(i)-(ii)



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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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 (c)(2)(iii)(2)



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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan 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.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



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