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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
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Treasury Shares [Line Items] |  |  |  |
Total shares (in shares) | 7 | 26 | 164 | 175
Total cost | $ 411 | $ 1,512 | $ 9,414 | $ 8,676
Average price per share (in usd per share) | $ 58.34 | $ 57.97 | $ 57.22 | $ 49.56
In the Open Market |  |  |  |
Treasury Shares [Line Items] |  |  |  |
Total shares (in shares) | 0 | 0 | 0 | 0
Total cost | $ 0 | $ 0 | $ 0 | $ 0
Average price per share (in usd per share) | $ 0 | $ 0 | $ 0 | $ 0
From Employees |  |  |  |
Treasury Shares [Line Items] |  |  |  |
Total shares (in shares) | 7 | 26 | 164 | 175
Total cost | $ 411 | $ 1,512 | $ 9,414 | $ 8,676
Average price per share (in usd per share) | $ 58.34 | $ 57.97 | $ 57.22 | $ 49.56

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