Equity-based Compensation Plans - Restricted Stock Units (Details) - Restricted Stock Units (RSUs) shares in Thousands	3 Months Ended
Mar. 31, 2018 shares
Restricted Stock Units
Outstanding at December 31, 2017 (in shares)	1,247
Vested (in shares)	2
Forfeited (in shares)	(3)
Outstanding at March 31, 2018 (in shares)	1,242

Number of shares under non-option equity instrument agreements that were forfeited as a result of occurrence of a terminating event.

No definition available.

+ Details

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- Definition

Number of shares under non-option equity instrument agreements that were vested as a result of occurrence of a terminating event

+ References

No definition available.

+ Details

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ 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)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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