Stock Based Awards and Other Equity Instruments - Summary of RSU Activity For MSUs (Parenthetical) (Details) - MSUs - shares	1 Months Ended	12 Months Ended
Nov. 30, 2017	Dec. 31, 2018
Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of originally granted shares that may be earned upon performance achievement, maximum		125.00%
Percentage of originally granted shares that may be earned upon performance achievement, minimum		0.00%
Stock awards vesting term		MSU award provides for vesting based upon the Company’s total shareholder return, or TSR, performance over the period commencing January 1, 2018 through December 31, 2020 relative to the TSR performance of the Nasdaq Composite Total Return Index.
Performance measurement period start date		Jan. 01, 2018
Performance measurement period end date		Dec. 31, 2020
Employees \| 2011 Plan
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, 2018 through December 31, 2020 relative to the TSR performance of the Nasdaq Composite Total Return Index.
Performance measurement period start date		Jan. 01, 2018
Performance measurement period end date		Dec. 31, 2020
CEO
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share transfer award	213,000

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

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

+ References

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MSU awards transferred during the quarter to the MSU award activity roll forward table.

+ References

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

+ 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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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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