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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, 2019 | Mar. 31, 2018
Treasury Shares [Line Items] |  |
Total shares (in shares) | 157 | 149
Total cost | $ 9,003 | $ 7,163
Average price per share (in usd per share) | $ 57.17 | $ 48.08
In the Open Market |  |
Treasury Shares [Line Items] |  |
Total shares (in shares) | 0 | 0
Total cost | $ 0 | $ 0
Average price per share (in usd per share) | $ 0.00 | $ 0.00
From Employees |  |
Treasury Shares [Line Items] |  |
Total shares (in shares) | 157 | 149
Total cost | $ 9,003 | $ 7,163
Average price per share (in usd per share) | $ 57.17 | $ 48.08

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