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Equity - Additional Information (Details) - USD ($) $ / shares in Units, shares in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 27, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stockholders' Equity Note [Abstract] |  |  |  |
Net proceeds from rights offering | $ 89,867,000 | $ 89,867,000 | $ 0 | $ 0
Rights offering, net (in shares) | 5,000 |  |  |
Exercise price (in dollars per share) | $ 18.00 |  |  |

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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
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- References No definition available. + Details
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