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Shared-Based Compensation Shared-Based Compensation - Phantom (Details) - shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |
Number of options granted | 55,300 | 55,300

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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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