Stockholders' Equity - New Hire Equity Awards (Details)	Sep. 18, 2017 award $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of equity awards \| award	2
Time-vesting New Hire Award
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of equity awards \| award	1
Time-vesting New Hire Award grants (in shares) \| shares	30,000
Grant date fair value (in dollars per share)	$ 42.89
Performance-vesting New Hire Award
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Time-vesting New Hire Award grants (in shares) \| shares	70,000
Grant date fair value (in dollars per share)	$ 10.63
Target level for determination of performance goals measures	100.00%
Performance-vesting New Hire Award \| Tranche One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cumulative total stockholder return rate	33.00%
Performance-vesting New Hire Award \| Tranche One \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share price (in dollars per share)	$ 60
Performance-vesting New Hire Award \| Tranche Two \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share price (in dollars per share)	$ 75

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- Definition

Share-based Compensation Arrangements by Share-based Payment Award, Number Of Equity Awards

+ References

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- Definition

Target level for the determination of performance goals and measures.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ 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)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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- Definition

Price of a single share of a number of saleable stocks of a company.

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