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.

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=6415400&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=6415400&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=6415400&loc=d3e5070-113901

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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.

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Stock-Based Compensation - Valuation Assumptions (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate (as a percent)	1.09%	1.13%	0.77%
Total dividend payments over the measurement period per share	2.40%	1.50%	1.50%
Outperformance Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate (as a percent)	1.63%
Total dividend payments over the measurement period per share	3.20%
The Company
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility rate	24.00%	22.00%	28.00%
The Company \| Outperformance Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility rate	23.00%
REIT Index
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility rate	17.00%	22.00%	26.00%
REIT Index \| Outperformance Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility rate	18.00%