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SHAREHOLDERS' EQUITY (Narrative) (Details) - $ / shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Class of Stock [Line Items] |  |  |  |
Cash dividends declared per common share (in usd per share) | $ 0.40 | $ 0.39 | $ 0.80 | $ 0.78
Series D Preferred Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Cash dividends declared per preferred share (in usd per share) | 0.34375 | 0.34375 | 0.68750 | 0.68750
Series E Preferred Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Cash dividends declared per preferred share (in usd per share) | $ 34.375 | $ 34.375 | $ 68.75 | $ 68.75

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