SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Weighted-Average Common Shares Outstanding Assuming Dilution) (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Weighted-average common shares outstanding	132,781	132,552	132,765	132,560
Dilutive effect of Stock-Only Stock Appreciation Rights	318	271	309	307
Dilutive effect of Other stock compensation plans	408	292	381	287
Weighted-average common shares outstanding, assuming dilution	133,507	133,115	133,455	133,154