Allocated Share-based Compensation Expense, Awards Vested

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- Definition

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

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- Definition

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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No definition available.

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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, Cash Contributions To ESPP

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No definition available.

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- Definition

Aggregate number of common shares reserved for future issuance.

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-Publisher FASB
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-Topic 210
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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

+ References

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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

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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- Definition

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

+ References

No definition available.

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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 share-based compensation awards.

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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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Stock Options, Restricted Stock Units and Employee Stock Purchase Plan - Additional Information (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($) offering_period shares	Dec. 31, 2018 shares	Apr. 27, 2017 shares	May 02, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in Shares)	4,082,000	3,418,000
Number of options granted (in Shares)	860,000	0
Contributions from plan participants through payroll deductions (in Shares) \| $	$ 500,000
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Number of awards granted (in Shares)	3,197,000
Number of units vested in period (in Shares)	273,000
Share-based compensation expense for awards vested \| $	$ 1,000,000.0
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance (in Shares)	0
Number of awards granted (in Shares)	1,239,000
Number of units vested in period (in Shares)	0
Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in Shares)	2,200,000		8,000,000.0
Options outstanding (in Shares)	500,000
Omnibus Plan \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options, outstanding (in Shares)	3,800,000
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
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)	3,200,000
2014 Plan \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options, outstanding (in Shares)	100,000
2003 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance (in Shares)		0
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
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]
Award vesting period	2 years
Number of awards granted (in Shares)	1,000,000.0
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]
Award vesting period	4 years
Number of awards granted (in Shares)	200,000
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)	200,000
Employee \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	2 years
Number of awards granted (in Shares)	2,700,000
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