Stock Based Awards and Other Equity Instruments - Summary of MSUs Activity (Parenthetical) (Details) - MSUs - Employees	6 Months Ended
Jun. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of originally granted shares that may be earned upon performance achievement, maximum	200.00%
Percentage of originally granted shares that may be earned upon performance achievement, minimum	0.00%
Stock awards vesting term	MSUs provide for vesting based upon the Company’s total shareholder return, or TSR, performance over the period commencing January 1, 2019 through December 31, 2021 relative to the TSR performance of the Nasdaq Composite Total Return Index.
Performance measurement period start date	Jan. 01, 2019
Performance measurement period end date	Dec. 31, 2021

Percentage of originally granted shares that may be earned upon performance achievement, maximum.

No definition available.

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- Definition

Percentage of originally granted shares that may be earned upon performance achievement, minimum.

+ References

No definition available.

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- Definition

Performance measurement period end date.

+ References

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- Definition

Performance measurement period start date.

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- Definition

Description of service or performance condition required to be met for earning right to award under share-based payment arrangement. Includes, but is not limited to, combination of market, performance or service condition.

+ 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=116856206&loc=d3e5070-113901

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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.

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