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Equity Incentive Plan - Valuation Assumptions (Details) - $ / shares | Mar. 01, 2019 | Mar. 01, 2018 | Mar. 01, 2017 | Jan. 28, 2016 | Jun. 01, 2015
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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) | 88,746 | 97,968 | 89,574 | 72,966 |
Estimate Value Per Unit (in dollars per share) | $ 18.45 | $ 16.83 | $ 18.53 | $ 16.69 |
Volatility, percentage | 21.00% | 26.00% | 24.00% | 28.00% |
Dividend Yield, percentage | 0.00% | 0.00% | 0.00% | 0.00% |
Risk Free Interest Rate, percentage | 2.57% | 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) | 133,107 | 146,949 | 134,348 | 39,285 |
Estimate Value Per Unit (in dollars per share) | $ 18.91 | $ 17.02 | $ 19.65 | $ 11.09 |
Volatility, percentage | 21.00% | 26.00% | 25.00% | 30.00% |
Dividend Yield, percentage | 6.20% | 6.20% | 5.80% | 5.80% |
Risk Free Interest Rate, percentage | 2.55% | 2.37% | 1.47% | 1.13% |

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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://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=116856206&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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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. + References No definition available. + Details
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