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Stock Plans - Unrecognized Share-based Compensation Costs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Unrecognized share-based compensation costs
Unrecognized Share-Based Compensation Costs	$ 29,485
Weighted Average Period Expected to be Recognized	2 years 6 months
Restricted stock units
Unrecognized share-based compensation costs
Unrecognized Share-Based Compensation Costs	$ 2,466
Weighted Average Period Expected to be Recognized	2 years 4 months 24 days
Restricted stock awards
Unrecognized share-based compensation costs
Unrecognized Share-Based Compensation Costs	$ 19,663
Weighted Average Period Expected to be Recognized	2 years 7 months 6 days
Performance share units
Unrecognized share-based compensation costs
Unrecognized Share-Based Compensation Costs	$ 7,356
Weighted Average Period Expected to be Recognized	2 years 4 months 24 days

X

- Definition

Unrecognized cost of unvested 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 (i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- References

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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