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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employee share purchase discount rate (in percent) | 15.00% |  |
Employee share purchase maximum purchase amount | $ 25 |  |
Trustee [Member] | Deferred Compensation [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Deferred compensation arrangement compensation expense | $ 100 | $ 100 | $ 100
Common Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employee share purchase (in shares) | 3,491 | 3,761 | 4,668

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