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Share Incentive and Other Compensation - Employee Share Purchase Plan and Deferred Share Plan (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Employee share purchase discount rate | 15.00% |
Employee share purchase maximum purchase amount | $ 25,000 |
Common Shares |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Employee share purchase (in shares) | 943 | 841

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- Definition Employee Stock Ownership Plan, Allowable Share Purchase Amount Per Annum, Maximum + References No definition available. + Details
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- Definition Employee Stock Ownership Plan, Purchase Discount Rate + References No definition available. + Details
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