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Stockholders' Equity - Common Stock (Details) - $ / shares									3 Months Ended
	Dec. 12, 2016	Sep. 14, 2016	Jun. 17, 2016	Mar. 15, 2016	Dec. 14, 2015	Jul. 28, 2015	Apr. 28, 2015	Feb. 25, 2015	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015
Class of Stock [Line Items]
Dividend Amount									$ 0.46	$ 0.46	$ 0.46	$ 0.46	$ 0.46	$ 0.44	$ 0.44	$ 0.44
Common Stock [Member]
Class of Stock [Line Items]
Dividend Amount	$ 0.46	$ 0.46	$ 0.46	$ 0.46	$ 0.46	$ 0.44	$ 0.44	$ 0.44

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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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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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