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Share-based Compensation (Details) - shares | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Share-based Compensation |  |
Number of shares held in treasury | 1,394,733 | 1,121,961
Restricted stock unit |  |
Share-based Compensation |  |
Number of shares of common stock per award | 1 |
Deferred stock units |  |
Share-based Compensation |  |
Number of shares of common stock per award | 1 |
Minimum | Restricted stock unit |  |
Share-based Compensation |  |
Requisite service periods | 1 year |
Maximum | Restricted stock unit |  |
Share-based Compensation |  |
Requisite service periods | 5 years |

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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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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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