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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Weighted-average common shares outstanding	132,437	132,413	132,563	132,524
Dilutive effect of Stock-Only Stock Appreciation Rights	583	1,317	636	1,330
Dilutive effect of Other stock compensation plans	1,031	1,005	1,081	1,071
Weighted-average common shares outstanding, assuming dilution	134,051	134,735	134,280	134,925