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Share Incentive and Other Compensation - Employee Share Purchase Plan and Deferred Share Plan - Additional Information (Details) - USD ($) | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
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) | 1,352 | 2,174

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- Definition Discount rate from fair value on purchase date that participants pay for shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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