Equity (Details 1) - $ / shares	3 Months Ended
	Jun. 30, 2016	Mar. 31, 2016
8.00% Series B [Member]
Dividends on preferred shares/units
Dividend per Share (usd per share)	$ 0.50	$ 0.50
Record Date	Jun. 30, 2016	Mar. 31, 2016
Payable Date	Jul. 15, 2016	Apr. 15, 2016
6.50% Series C [Member]
Dividends on preferred shares/units
Dividend per Share (usd per share)	$ 0.41	$ 0.41
Record Date	Jun. 30, 2016	Mar. 31, 2016
Payable Date	Jul. 15, 2016	Apr. 15, 2016
6.375% Series D [Member]
Dividends on preferred shares/units
Dividend per Share (usd per share)	$ 0.16
Record Date	Jun. 30, 2016
Payable Date	Jul. 15, 2016