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Changes in Capital Structure - Schedule of dividends paid (Details) - $ / shares |  | 3 Months Ended
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Apr. 19, 2018 | Mar. 31, 2018 | Mar. 31, 2017
Dividends [Abstract] |  |  |
Dividends Per Common Share (in usd per share) |  | $ 0.03 | $ 0.03
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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- 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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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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