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Changes in Capital Structure - Schedule of dividends paid (Details) - $ / shares |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 18, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Dividends [Abstract] |  |  |  |  |  |
Dividends Per Common Share (in usd per share) |  | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.06 | $ 0.06
Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Common stock dividends declared (in usd per share) | $ 0.03 |  |  |  |  |
Common stock dividends proposed annual amount (in usd per share) | $ 0.12 |  |  |  |  |

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- Definition Aggregate dividends paid 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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