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

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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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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The percent of target applied to determine the number of units paid for performance share awards.

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INCENTIVE PLANS (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of authorized shares remaining	6,331,687
Officers And Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense provision under cash-based compensation plans	$ 42,138	$ 40,847	$ 36,969
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	$ 17,798	$ 18,236	$ 13,656
Weighted-average Grant Date Fair Value, Granted	$ 133.95	$ 110.39	$ 117.20
Share-based compensation plans vesting period (in years)	3 years
SOSARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	$ 3,855	$ 4,042	$ 4,763
Share-based compensation plans vesting period (in years)	3 years
Share-based compensation plans expiration period (in years)	10 years
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	$ 9,766	$ 7,789	$ 4,831
Weighted-average Grant Date Fair Value, Granted	$ 133.95	$ 110.39	$ 117.20
Share-based compensation plans vesting period (in years)	3 years
Deferred Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	$ 1,572	$ 1,776	$ 1,965
Minimum [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units paid target range	0.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares that may be issued	8,000,000
Maximum [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units paid target range	200.00%