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Stockholders' Equity - Common Stock (Details) - $ / shares									3 Months Ended
	Dec. 14, 2015	Jul. 28, 2015	Apr. 28, 2015	Feb. 25, 2015	Oct. 28, 2014	Jul. 28, 2014	Apr. 29, 2014	Feb. 26, 2014	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014
Class of Stock [Line Items]
Dividend Amount									$ 0.46	$ 0.44	$ 0.44	$ 0.44	$ 0.40	$ 0.40	$ 0.40	$ 0.40
Common Stock [Member]
Class of Stock [Line Items]
Dividend Amount	$ 0.46	$ 0.44	$ 0.44	$ 0.44	$ 0.4	$ 0.4	$ 0.4	$ 0.40

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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.

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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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

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