Represents the maximum employee payroll deduction per offering period for an employee stock purchase plan.

No definition available.

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- Definition

The 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).

+ References

No definition available.

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- Definition

The lowest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Target Performance Term

+ References

No definition available.

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

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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

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).

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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

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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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.

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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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

+ References

No definition available.

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- Definition

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

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Purchase price of common stock expressed as a percentage of its fair value.

+ References

No definition available.

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STOCK-BASED COMPENSATION - Additional Information (Details) - USD ($)			1 Months Ended	12 Months Ended
	Jun. 05, 2019	Feb. 18, 2015	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2015	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercises in period, intrinsic value				$ 4,600,000	$ 1,200,000	$ 4,200,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	13,335,430							10,275,000
Purchase period								10 years
Number of additional shares authorized (in shares)	6,000,000
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in dollars per share)				$ 13.88	$ 10.35	$ 13.70
Grant date fair value				$ 1,300,000	$ 1,100,000	$ 600,000
Vested in period, fair value				2,300,000	$ 1,100,000	$ 1,300,000
Unrecognized compensation cost				$ 500,000
Expected weighted-average recognition period for compensation expense				4 months 24 days
Granted (in shares)				94,558
Restricted stock units \| Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period						1 year
Restricted stock units \| Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period							5 years
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in dollars per share)				$ 14.96	$ 11.12	$ 12.64
Grant date fair value				$ 40,100,000	$ 28,600,000	$ 33,500,000
Vested in period, fair value				15,900,000	$ 8,600,000	$ 9,300,000
Unrecognized compensation cost				$ 62,900,000
Expected weighted-average recognition period for compensation expense				3 years 3 months 18 days
Granted (in shares)				2,678,047
Restricted stock awards \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target performance term			3 years
Restricted stock awards \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target performance term			5 years
Restricted stock awards \| Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period							1 year
Restricted stock awards \| Employee \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period							2 years
Restricted stock awards \| Employee \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period							5 years
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)				500,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase period		6 months
Expected dividend rate				0.00%
Fair value of the company's stock taken for purchase price calculation		85.00%
Amount to be deducted from the payroll, minimum		1.00%
Amount to be deducted from the payroll, maximum		15.00%
Maximum amount of deduction from payroll		$ 7,500
Employee Stock Purchase Plan \| Class A Common
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)		1,833,857