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Dividends and Distribution Payable (Details) - $ / shares	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Dividends Payable [Line Items]
Dividends Payable, Amount Per Share	$ 2.025	$ 1.920	$ 1.845
Dividend Declared, Ordinary Income [Member]
Dividends Payable [Line Items]
Dividends Payable, Amount Per Share	1.695	1.557	1.519
Dividend Declared, Return of Capital [Member]
Dividends Payable [Line Items]
Dividends Payable, Amount Per Share	$ 0.330	$ 0.363	$ 0.326

X

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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X

- 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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