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Summary of RSU and PSU Activity (Parenthetical) (Details) - Performance Stock Units (PSUs) [Member] - 2015 Plan [Member]	3 Months Ended
	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%

X

- 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.

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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

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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

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