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Subsequent Events (Details) - $ / shares |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 21, 2018 | Nov. 02, 2017 | Aug. 02, 2017 | May 05, 2017 | Feb. 21, 2017 | Nov. 02, 2016 | Aug. 03, 2016 | May 02, 2016 | Feb. 22, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash Dividend |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared (in dollars per share) |  | $ 0.060 | $ 0.055 | $ 0.055 | $ 0.055 | $ 0.055 | $ 0.055 | $ 0.055 | $ 0.055 | $ 0.225 | $ 0.220 | $ 0.205
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |
Cash Dividend |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared (in dollars per share) | $ 0.06 |  |  |  |  |  |  |  |  |  |  |

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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 + Details
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- References No definition available. + Details
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- Details
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