Share-based Compensation, Shares Authorized Under Stock Option Plans, Percent Subject To Exercise Price Range

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

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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.

+ References

No definition available.

+ Details

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

+ Details

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Share-based Compensation and Equity - Stock Option Grant (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended	12 Months Ended
	Jan. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in the period (in shares)					717,000	4,283,000	303,000
Exercise price of stock options granted in the period (in dollars per share)					$ 14.27	$ 19.01	$ 23.29
Employee Time Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense				$ 15,000
Employee Time Options \| Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense		$ 5,100
Chief Executive Officer \| Executive Profits Interests \| Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in the period (in shares)	2,773,000
Chief Executive Officer \| Executive Profits Interests \| Class B Common Stock \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price of stock options granted in the period (in dollars per share)	$ 17.00
Percent of options subject to exercise price range	50.00%
Chief Executive Officer \| Executive Profits Interests \| Class B Common Stock \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price of stock options granted in the period (in dollars per share)	$ 21.32
Percent of options subject to exercise price range	50.00%
Chief Executive Officer \| Executive Profits Interests \| Employee Time Options \| Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense			$ 14,600