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SHAREHOLDERS' EQUITY (Treasury Shares) (Details) - Common stocks - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Treasury Shares [Line Items]
Total shares (in shares)	0	51	175	4,284
Total cost	$ 0	$ 3,347	$ 8,699	$ 285,659
Average price per share (in usd per share)	$ 0.00	$ 65.74	$ 49.57	$ 66.68
In the Open Market
Treasury Shares [Line Items]
Total shares (in shares)	0	49	0	3,932
Total cost	$ 0	$ 3,237	$ 0	$ 261,180
Average price per share (in usd per share)	$ 0.00	$ 65.80	$ 0.00	$ 66.43
From Employees
Treasury Shares [Line Items]
Total shares (in shares)	0	2	175	352
Total cost	$ 0	$ 110	$ 8,699	$ 24,479
Average price per share (in usd per share)	$ 0.00	$ 64.04	$ 49.57	$ 69.53

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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