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Summary of RSU and PSU Activity (Parenthetical) (Details) - Performance Stock Units (PSUs) [Member] - 2015 Plan [Member] | 3 Months Ended
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Mar. 31, 2019 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Actual number of PSUs granted to each recipient, eligible to vest | 62,791
Percentage of target number of PSU's eligible to vest at "maximum" performance level | 200.00%

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- Definition Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, eligible to vest upon condition. + 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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