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Benefit Plans - Share Option Activity (Details) - Share Options [Member] - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |
Number of shares outstanding, beginning (in shares) | 406,241 | 1,350,410
Number of shares exercised (in shares) | (271,451) | (944,169)
Number of shares outstanding, ending (in shares) | 134,790 | 406,241
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |
Price per share outstanding, beginning (usd per share) | $ 6.78 | $ 7.05
Price per share exercised (usd per share) | 6.48 | 7.17
Price per share outstanding, ending (usd per share) | $ 7.39 | $ 6.78

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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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