The stock surrendered during the period.

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The value stock surrendered during the period.

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

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

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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

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Number of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.

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SHAREHOLDERS EQUITY - Stock based compensation - Share Awards (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Stock issued (in shares)	36,932	34,260	43,059	34,260
Stock surrendered (in shares)	14,545	19,852	17,369	19,852
Stock surrendered to cover employee withholding taxes	$ 0.4	$ 0.3	$ 0.4	$ 0.3
Time Vesting 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 year			285,052
Granted (in shares)			58,817
Vested (in shares)			(60,428)
Forfeited (in shares)			(8,771)
Outstanding at end of year	274,670		274,670
Stock-based compensation expense	$ 0.4	$ 0.3	$ 0.8	$ 0.6
Unrecognized compensation expense	$ 4.5		$ 4.5
Unrecognized compensation expense recognition period (in years)			2 years 1 month 6 days
Time Vesting Units \| Third and fifth anniversaries
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Service period (in years)			5 years
Time Vesting Units \| Anniversary of grant date
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Vesting Percentage			20.00%
Financial Performance 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 year			152,430
Granted (in shares)			41,366
Forfeited (in shares)			(3,953)
Outstanding at end of year	189,843		189,843
Market Performance 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 year			14,862
Forfeited (in shares)			(611)
Outstanding at end of year	14,251		14,251
Unrecognized compensation expense	$ 0.4		$ 0.4
Unrecognized compensation expense recognition period (in years)			1 year