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Basis Of Presentation Dividend Policy (Details) - $ / shares | 1 Months Ended | 3 Months Ended | 6 Months Ended
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Aug. 31, 2016 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Dividend Policy [Abstract] |  |  |  |  |  |
Dividends declared per share | $ 0.09 |  |  |  |  |
Cash dividends paid per share |  | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.18 | $ 0.18

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- Definition Dividend Policy [Abstract] + References No definition available. + Details
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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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