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Share-based Compensation (Details) - shares | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Share-based Compensation |  |
Number of shares held in treasury | 524,097 | 310,745
RSU |  |
Share-based Compensation |  |
Number of shares of common stock per award | 1 |
Minimum | RSU |  |
Share-based Compensation |  |
Requisite service periods | 1 year |
Maximum | RSU |  |
Share-based Compensation |  |
Requisite service periods | 5 years |
Board of directors and advisory directors | DSUs |  |
Share-based Compensation |  |
Number of shares of common stock per award | 1 |
Settlement period | 30 days |

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- Definition Represents the settlement period of awards, following the earlier of separation from the Board or a change in control of the entity. + References No definition available. + Details
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- Definition Represents the number of shares of common stock per award under the equity-based compensation plan. + References No definition available. + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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