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Subsequent Events (Details) - shares |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 09, 2018 | Jan. 02, 2018 | Dec. 31, 2017
Subsequent Event [Line Items] |  |  |
Granted (in shares) |  |  | 124,126
Granted (in shares) |  |  | 410,960
Subsequent Event | Restricted Stock |  |  |
Subsequent Event [Line Items] |  |  |
Granted (in shares) | 19,100 | 37,700 |
Subsequent Event | Stock Option | Senior Management |  |  |
Subsequent Event [Line Items] |  |  |
Granted (in shares) |  | 433,400 |
Subsequent Event | Stock Option | Employees |  |  |
Subsequent Event [Line Items] |  |  |
Granted (in shares) | 921,700 |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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Balance Type: | na
Period Type: | duration

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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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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Details
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