SHARE-BASED COMPENSATION PLANS (Details - Cash-settled Awards - Roll forward of SARs and cash-settled RSUs (excluding stock salary) as well as the related expenses) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock expense	$ 23.7
Total unrecognized compensation costs	$ 25.0
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecongized compensation costs, period for recognition	5 years
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecongized compensation costs, period for recognition	1 year 4 months 9 days
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested, beginning of year (in shares)	1,231,185	1,634,610	595,250
Granted (in shares)	583,068	399,779	1,385,929
Vested (in shares)	(535,220)	(774,350)	(342,481)
Forfeited (in shares)	(127,653)	(28,854)	(4,088)
Unvested, end of year (in shares)	1,151,380	1,231,185	1,634,610
RSUs \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecongized compensation costs, period for recognition	3 years
RSUs \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecongized compensation costs, period for recognition	1 year

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 noncash expense for award of restricted stock or unit under share-based payment arrangement.

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

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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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