CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
PREFERRED SHARES
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01	$ 0.01
Series K Preferred Stock [Member]
PREFERRED SHARES
Preferred Stock Preference Units Dividend Rate Percentage	8.29%	8.29%	8.29%