STOCKHOLDERS' EQUITY AND EQUITY INSTRUMENTS (Additional Information) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity compensation, additional general disclosures [Abstract]
Options outstanding (in shares)	887,867	708,746
Number of options outstanding that are exercisable (in shares)	416,860	446,794
Compensation expense related to stock-based compensation awards	$ 6.3	$ 7.8	$ 5.0
Unrecorded compensation cost related to non-vested awards	$ 12.6
Unrecorded compensation cost, weighted average period of recognition	2 years 2 months 12 days
Stock options
Equity compensation, additional general disclosures [Abstract]
Fair value of options vested	$ 0.8	2.7	1.4
Intrinsic value of stock options exercised during the period	0.1	$ 0.1	$ 0.1
Intrinsic value of options outstanding	2.7
Intrinsic value of options exercisable	$ 0.1

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

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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