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Annual purchase of stock per employee under a share based compensation plan.

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Base wages subject to withholding towards stock purchase under a share based compensation plan.

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- Definition

Number of Offering Periods

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- Definition

The percentage of base wages withheld for the purchase of stock under a share based compensation plan.

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Additional Number Of Shares Authorized

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Cash Contributions To ESPP

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Installments Over First Two Anniversaries

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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- Definition

Aggregate number of common shares reserved for future issuance.

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

Discount rate from fair value on offering date that participants pay for shares.

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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

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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

The highest quantity of shares an employee can purchase under the plan per period.

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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- Definition

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

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- Definition

Number of options outstanding, including both vested and non-vested options.

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- Definition

Percentage of vesting of award under share-based payment arrangement.

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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Equity Compensation Plans - Additional Information (Details)		3 Months Ended		9 Months Ended		12 Months Ended
	May 19, 2019 installment shares	Sep. 30, 2019 USD ($) shares	Sep. 30, 2018 USD ($) shares	Sep. 30, 2019 USD ($) offering_period shares	Sep. 30, 2018 USD ($) shares	Dec. 31, 2018 shares	May 01, 2019 shares	Apr. 27, 2017 shares	May 02, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in Shares)		5,173,000		5,173,000		3,418,000
Number of options granted (in Shares)				3,088,000		0
Stock-based compensation expense \| $		$ 5,726,000	$ 5,746,000	$ 16,034,000	$ 17,199,000
Contributions from plan participants through payroll deductions (in Shares) \| $		$ 600,000		$ 1,700,000
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards granted (in Shares)				4,296,000
Award vesting period				4 years
Number of units vested in period (in Shares)		46,500,000	100,000	631,000	300,000
Share-based compensation expense for awards vested \| $		$ 200,000	$ 1,900,000	$ 2,100,000	$ 3,900,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance (in Shares)		0		0
Number of awards granted (in Shares)		0		1,239,000
Number of units vested in period (in Shares)				0
Cash-Based Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards granted (in Shares)	9,700,000
Award vesting period	2 years
Number of installments \| installment	2
Stock-based compensation expense \| $		$ 1,100,000		$ 1,800,000
Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in Shares)		3,500,000		3,500,000			12,400,000	8,000,000.0
Number of additional shares authorized (in shares)							4,400,000
Options outstanding (in Shares)		2,600,000		2,600,000
Omnibus Plan \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options, outstanding (in Shares)		4,500,000		4,500,000
Omnibus Plan \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options, outstanding (in Shares)		1,000,000.0		1,000,000.0
2014 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance (in Shares)									7,500,000
Options outstanding (in Shares)		2,100,000		2,100,000
2014 Plan \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options, outstanding (in Shares)		34,100,000		34,100,000
Employee Stock Purchase Plan ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance (in Shares)		2,000,000.0		2,000,000.0
Discount from market price at the beginning or end of the offering period				15.00%
Number of offering periods \| offering_period				2
Maximum annual purchase per employee under ESPP \| $				$ 25,000
Maximum annual withholdings per employee for purchases under ESPP \| $				$ 21,250
Maximum number of shares available for purchase per employee (in Shares)				15,000
Employee stock purchase plan (in Shares)				146,247
Employee Stock Purchase Plan ESPP \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of base wages withheld for purchase of stock				1.00%
Employee Stock Purchase Plan ESPP \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of base wages withheld for purchase of stock				15.00%
Tranche One \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual award vesting percentage				25.00%
Tranche One \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards granted (in Shares)				1,000,000.0
Award vesting period				2 years
Tranche Two \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual award vesting percentage				25.00%
Tranche Two \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards granted (in Shares)				200,000
Award vesting period				4 years
Tranche Three \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual award vesting percentage				25.00%
Tranche Four \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual award vesting percentage				25.00%
Prospective Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted (in Shares)				400,000
Prospective Employee \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards granted (in Shares)				500,000
Prospective Employee \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards granted (in Shares)				300,000
Employee \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards granted (in Shares)				2,700,000
Award vesting period				2 years
Employees And Executives \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards granted (in Shares)				1,100,000
Chief Executive Officer \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards granted (in Shares)				500,000