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SHAREHOLDERS' EQUITY (Treasury Shares) (Details) - Common stocks - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
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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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