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Stock-Based Compensation - Valuation Assumptions (Details) | 12 Months Ended
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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% |  |

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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=6415400&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://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 + 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://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 + 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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