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Summary of RSU and PSU Activity (Parenthetical) (Details) - Performance Stock Units (PSUs) [Member] - 2015 Plan [Member] | 9 Months Ended
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Sep. 30, 2018 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Target number of PSU's eligible to vest at "maximum" performance level | 108,957 | [1]
Percentage of target number of PSU's eligible to vest at "maximum" performance level | 200.00% |
[1] | The number of shares listed for PSUs as outstanding at January 1, 2018 and granted in 2018 represents the “target” number of PSUs granted to each recipient eligible to vest if the Company meets its “target” performance goals for the applicable period. The actual number of PSUs eligible to vest will vary depending on whether or not the Company meets or exceeds the applicable threshold, target or maximum performance goals for the PSUs. With respect to 108,957 of the listed “target” number of PSUs, 200% of the “target” number of PSUs will be eligible to vest at “maximum” performance levels.

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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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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 Percentage of vesting of share-based compensation awards. + 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=109197908&loc=d3e5070-113901 + Details
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