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EQUITY PLANS EQUITY PLANS - RSU and PSU equity activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of period (in shares)	76,343
Granted (in shares)	762,670
Vested (in shares)	(422,962)
Forfeited (in shares)	1,642
Outstanding at end of period (in shares)	414,409	76,343
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of period (in shares)	53,613
Granted (in shares)	48,209
Vested (in shares)	(53,617)
Forfeited (in shares)	16,727
Outstanding at end of period (in shares)	31,478	53,613
Liability classified restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of period (in shares)	9,572
Vested (in shares)	(9,572)
Forfeited (in shares)	0
Outstanding at end of period (in shares)	0	9,572
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollar per share)	$ 25.50
Vested (in dollar per share)	25.50
Forfeited (in dollar per share)	25.50
Outstanding at end of period (in dollar per share)	25.50	$ 25.50
RSUs and PSUs
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollar per share)	28.57
Granted (in dollar per share)	31.27	30.68	$ 27.15
Vested (in dollar per share)	26.17
Forfeited (in dollar per share)	26.52
Outstanding at end of period (in dollar per share)	$ 36.12	$ 28.57

X

- Definition

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

+ References

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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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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 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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