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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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- 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 + Details
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