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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
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Treasury Shares [Line Items] |  |  |  |
Total shares (in shares) | 4 | 2 | 201 | 155
Total cost | $ 206 | $ 84 | $ 10,025 | $ 8,685
Average price per share (in usd per share) | $ 49.91 | $ 46.85 | $ 49.87 | $ 55.94
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) | 4 | 2 | 201 | 155
Total cost | $ 206 | $ 84 | $ 10,025 | $ 8,685
Average price per share (in usd per share) | $ 49.91 | $ 46.85 | $ 49.87 | $ 55.94

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