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SHAREHOLDERS' EQUITY (Treasury Shares) (Details) - Common stocks - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Treasury Shares [Line Items]
Total shares (in shares)	26	2,004	175	4,233
Total cost	$ 1,512	$ 131,070	$ 8,676	$ 282,313
Average price per share (in usd per share)	$ 57.97	$ 65.40	$ 49.56	$ 66.69
In the Open Market
Treasury Shares [Line Items]
Total shares (in shares)	0	1,987	0	3,883
Total cost	$ 0	$ 129,960	$ 0	$ 257,943
Average price per share (in usd per share)	$ 0.00	$ 65.40	$ 0.00	$ 66.44
From Employees
Treasury Shares [Line Items]
Total shares (in shares)	26	17	175	350
Total cost	$ 1,512	$ 1,110	$ 8,676	$ 24,370
Average price per share (in usd per share)	$ 57.97	$ 64.82	$ 49.56	$ 69.55

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