Equity Incentive Plan - Valuation Assumptions (Details) - $ / shares	Mar. 01, 2018	Mar. 01, 2017	Jan. 28, 2016	Jun. 01, 2015
Outperformance Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, Granted (in shares)				183,300
Estimate Value Per Unit (in dollars per share)				$ 14.13
Volatility, percentage				26.00%
Dividend Yield, percentage				4.50%
Risk Free Interest Rate, percentage				0.95%
Long Term Incentive Plan Units, Time-Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, Granted (in shares)	97,968	89,574	72,966
Estimate Value Per Unit (in dollars per share)	$ 16.83	$ 18.53	$ 16.69
Volatility, percentage	26.00%	24.00%	28.00%
Dividend Yield, percentage	0.00%	0.00%	0.00%
Risk Free Interest Rate, percentage	2.07%	0.92%	0.79%
Long Term Incentive Plan Units, Performance-Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, Granted (in shares)	146,949	134,348	39,285
Estimate Value Per Unit (in dollars per share)	$ 17.02	$ 19.65	$ 11.09
Volatility, percentage	26.00%	25.00%	30.00%
Dividend Yield, percentage	6.20%	5.80%	5.80%
Risk Free Interest Rate, percentage	2.37%	1.47%	1.13%

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).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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=109197908&loc=d3e5070-113901

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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

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-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=109197908&loc=d3e5070-113901

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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

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-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=109197908&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

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-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=109197908&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.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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