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Share Incentive and Other Compensation - Employee Share Purchase Plan and Deferred Share Plan (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Employee share purchase discount rate | 15.00% |
Employee share purchase maximum purchase amount | $ 25 |
Common Shares |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Employee share purchase (in shares) | 4,514 | 4,016

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