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- Definition

ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageofTotalAward

+ References

No definition available.

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- 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=96867065&loc=d3e5070-113901

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- Definition

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)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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

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)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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 Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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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.

+ 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)
-URI http://asc.fasb.org/extlink&oid=96867065&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

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)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- References

No definition available.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ 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 (f)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the 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 (f)(2)(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ 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 (f)(2)(iv)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Share-Based Compensation Plan (Details) - USD ($) $ / shares in Units, $ in Millions								6 Months Ended
	Feb. 15, 2017	Feb. 10, 2016	Jul. 27, 2015	Feb. 11, 2015	Feb. 04, 2014	Dec. 13, 2013	Jan. 30, 2013	Jun. 30, 2017
Restricted Stock [Member]
Summary of restricted share activity
Unvested shares, Beginning balance								135,891
Unvested shares, Granted								58,839
Vested, shares								(57,559)
Forfeited, shares								(200)
Unvested shares, Ending balance								136,971
Unvested weighted average grant date fair value, beginning balance (in usd per share)								$ 30.82
Granted, weighted average grant date fair value (in usd per share)								29.64
Vested, weighted average grant date fair value (in usd per share)								31.50
Forfeited, weighted average grant date fair value (in usd per share)								26.97
Unvested weighted average grant date fair value, ending balance (in usd per share)								$ 30.03
Performance Shares [Member] \| January 2013 [Member]
Summary of restricted share activity
Unvested shares, Granted							72,118
Performance Shares [Member] \| January 2013 [Member] \| Relative TSR [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Percentage of Total Award							30.00%
Grant Date Fair Value by Component ($ in millions)							$ 0.7
Volatility							31.00%
Interest Rate							0.41%
Dividend Yield							2.20%
Performance Shares [Member] \| January 2013 [Member] \| Absolute TSR [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Percentage of Total Award							30.00%
Grant Date Fair Value by Component ($ in millions)							$ 0.5
Volatility							31.00%
Interest Rate							0.41%
Dividend Yield							2.20%
Performance Shares [Member] \| January 2013 [Member] \| EBITDA Comparison [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Percentage of Total Award							40.00%
Grant Date Fair Value by Component ($ in millions)							$ 0.7
Volatility							31.00%
Interest Rate							0.41%
Dividend Yield							2.20%
Performance Shares [Member] \| December 2013 [Member]
Summary of restricted share activity
Unvested shares, Granted						252,088
Performance Shares [Member] \| December 2013 [Member] \| Relative TSR [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Percentage of Total Award						50.00%
Grant Date Fair Value by Component ($ in millions)						$ 4.7
Volatility						29.00%
Dividend Yield						2.40%
Performance Shares [Member] \| December 2013 [Member] \| Relative TSR [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Interest Rate						0.34%
Performance Shares [Member] \| December 2013 [Member] \| Relative TSR [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Interest Rate						2.25%
Performance Shares [Member] \| December 2013 [Member] \| Absolute TSR [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Percentage of Total Award						50.00%
Grant Date Fair Value by Component ($ in millions)						$ 2.9
Volatility						29.00%
Dividend Yield						2.40%
Performance Shares [Member] \| December 2013 [Member] \| Absolute TSR [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Interest Rate						0.34%
Performance Shares [Member] \| December 2013 [Member] \| Absolute TSR [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Interest Rate						2.25%
Performance Shares [Member] \| February 2014 [Member]
Summary of restricted share activity
Unvested shares, Granted					66,483
Performance Shares [Member] \| February 2014 [Member] \| Relative TSR [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Percentage of Total Award					30.00%
Grant Date Fair Value by Component ($ in millions)					$ 0.7
Volatility					29.00%
Interest Rate					0.62%
Dividend Yield					2.40%
Performance Shares [Member] \| February 2014 [Member] \| Absolute TSR [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Percentage of Total Award					30.00%
Grant Date Fair Value by Component ($ in millions)					$ 0.5
Volatility					29.00%
Interest Rate					0.62%
Dividend Yield					2.40%
Performance Shares [Member] \| February 2014 [Member] \| EBITDA Comparison [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Percentage of Total Award					40.00%
Grant Date Fair Value by Component ($ in millions)					$ 0.8
Volatility					29.00%
Interest Rate					0.62%
Dividend Yield					2.40%
Performance Shares [Member] \| February 2015 [Member]
Summary of restricted share activity
Unvested shares, Granted				44,962
Performance Shares [Member] \| February 2015 [Member] \| Relative TSR [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Percentage of Total Award				30.00%
Grant Date Fair Value by Component ($ in millions)				$ 0.9
Volatility				22.00%
Interest Rate				1.02%
Dividend Yield				2.50%
Performance Shares [Member] \| February 2015 [Member] \| Absolute TSR [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Percentage of Total Award				40.00%
Grant Date Fair Value by Component ($ in millions)				$ 0.7
Volatility				22.00%
Interest Rate				1.02%
Dividend Yield				2.50%
Performance Shares [Member] \| February 2015 [Member] \| EBITDA Comparison [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Percentage of Total Award				30.00%
Grant Date Fair Value by Component ($ in millions)				$ 0.7
Volatility				22.00%
Interest Rate				1.02%
Dividend Yield				2.50%
Performance Shares [Member] \| July 2015 [Member]
Summary of restricted share activity
Unvested shares, Granted			771
Performance Shares [Member] \| July 2015 [Member] \| Relative TSR [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Percentage of Total Award			30.00%
Grant Date Fair Value by Component ($ in millions)			$ 0.0
Volatility			22.00%
Interest Rate			0.68%
Dividend Yield			2.50%
Performance Shares [Member] \| July 2015 [Member] \| Absolute TSR [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Percentage of Total Award			40.00%
Grant Date Fair Value by Component ($ in millions)			$ 0.0
Volatility			22.00%
Interest Rate			0.68%
Dividend Yield			2.50%
Performance Shares [Member] \| July 2015 [Member] \| EBITDA Comparison [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Percentage of Total Award			30.00%
Grant Date Fair Value by Component ($ in millions)			$ 0.0
Volatility			22.00%
Interest Rate			0.68%
Dividend Yield			2.50%
Performance Shares [Member] \| February 2016 [Member]
Summary of restricted share activity
Unvested shares, Granted		100,919
Performance Shares [Member] \| February 2016 [Member] \| Relative TSR [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Percentage of Total Award		70.00%
Grant Date Fair Value by Component ($ in millions)		$ 1.6
Volatility		25.00%
Interest Rate		0.71%
Dividend Yield		3.00%
Performance Shares [Member] \| February 2016 [Member] \| Absolute TSR [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Percentage of Total Award		15.00%
Grant Date Fair Value by Component ($ in millions)		$ 0.2
Volatility		25.00%
Interest Rate		0.71%
Dividend Yield		3.00%
Performance Shares [Member] \| February 2016 [Member] \| EBITDA Comparison [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Percentage of Total Award		15.00%
Grant Date Fair Value by Component ($ in millions)		$ 0.4
Volatility		25.00%
Interest Rate		0.71%
Dividend Yield		3.00%
Performance Shares [Member] \| February 2017 [Member]
Summary of restricted share activity
Unvested shares, Granted	81,939
Performance Shares [Member] \| February 2017 [Member] \| Relative TSR [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Percentage of Total Award	65.00%
Volatility	28.00%
Interest Rate	1.27%
Dividend Yield	5.60%
Performance Shares [Member] \| February 2017 [Member] \| Absolute TSR [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Percentage of Total Award	35.00%
Volatility	28.00%
Interest Rate	1.27%
Dividend Yield	5.60%
Performance Shares [Member] \| February 2017 [Member] \| Relative & Absolute TSR [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Grant Date Fair Value by Component ($ in millions)	$ 2.7