Equity-Based Compensation - Schedule of Unrecognized Compensation Cost (Details) $ in Thousands	9 Months Ended
Sep. 30, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Expense Related to Outstanding Awards	$ 10,419
RSUs with service vesting conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Expense Related to Outstanding Awards	$ 7,039
Remaining Weighted-Average Amortization Period (in years)	1 year 10 months 24 days
RSUs with performance vesting conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Expense Related to Outstanding Awards	$ 182
Remaining Weighted-Average Amortization Period (in years)	4 months
RSUs with market vesting conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Expense Related to Outstanding Awards	$ 3,198
Remaining Weighted-Average Amortization Period (in years)	1 year 11 months 24 days

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.

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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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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- Definition

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+ References

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