STOCK-BASED COMPENSATION - Restricted Stock (Details) shares in Thousands	12 Months Ended
Dec. 31, 2019 $ / shares shares
Employee awards
Vesting percentage on the day before each anniversary date follwoing date of grant	0.33%
Roll-forward of awards
Granted (in shares)	79
Restricted Stock
Roll-forward of awards
Unvested, beginning of year (in shares)	819
Granted (in shares)	171
Vested (in shares)	(409)
Forfeited (in shares)	(27)
Unvested, end of year (in shares)	554
Stock-Settled Restricted Stock
Restricted stock awards weighted-average grant-date fair value (in dollars per share)
Unvested, beginning of year, weighted-average grant-date fair value (in dollars per share) \| $ / shares	$ 17.36
Granted, weighted-average grant-date fair value (in dollars per share) \| $ / shares	21.71
Vested, weighted-average grant-date fair value (in dollars per share) \| $ / shares	19.20
Forfeited, weighted-average grant-date fair value (in dollars per share) \| $ / shares	13.48
Unvested, end of year, weighted-average grant-date fair value (in dollars per share) \| $ / shares	$ 17.54
Cash-Settled Restricted Stock
Roll-forward of awards
Unvested, beginning of year (in shares)	2,636
Granted (in shares)	1,511
Vested (in shares)	(1,391)
Forfeited (in shares)	(471)
Unvested, end of year (in shares)	2,285
Employees \| Restricted Stock
Employee awards
Award vesting period	3 years

Percentage of vesting of share-based compensation awards each anniversary date.

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

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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