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