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SHAREHOLDERS' EQUITY (Treasury Shares) (Details) - Common stocks - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Treasury Shares [Line Items]
Total shares (in shares)	149	2,229
Total cost	$ 7,163	$ 151,242
Average price per share (in usd per share)	$ 48.08	$ 67.86
In the Open Market
Treasury Shares [Line Items]
Total shares (in shares)	0	1,896
Total cost	$ 0	$ 127,982
Average price per share (in usd per share)	$ 0.00	$ 67.52
From Employees
Treasury Shares [Line Items]
Total shares (in shares)	149	333
Total cost	$ 7,163	$ 23,260
Average price per share (in usd per share)	$ 48.08	$ 69.80

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
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Number of shares that have been repurchased during the period and are being held in treasury.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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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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