Equity (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Common stock, dividends, per share, declared	$ 0.655	$ 0.640	$ 0.607
Common stock dividend rate percentage	100.00%	100.00%	100.00%
Preferred stock, dividends per share, declared	$ 2.000	$ 1.372	$ 0
Preferred stock, dividend rate, percentage	8.00%	8.00%	0.00%
Ordinary Dividend [Member]
Common stock, dividends, per share, declared	$ 0.097	$ 0.018	$ 0.093
Common stock dividend rate percentage	14.80%	2.80%	15.30%
Preferred stock, dividends per share, declared	$ 1.565	$ 1.272	$ 0
Preferred stock, dividend rate, percentage	78.30%	92.70%	0.00%
Qualified Dividend [Member]
Common stock, dividends, per share, declared	$ 0.008	$ 0.001	$ 0
Common stock dividend rate percentage	1.20%	0.20%	0.00%
Preferred stock, dividends per share, declared	$ 0.128	$ 0.100	$ 0
Preferred stock, dividend rate, percentage	6.40%	7.30%	0.00%
Capital Gain [Member]
Common stock, dividends, per share, declared	$ 0	$ 0	$ 0
Common stock dividend rate percentage	0.00%	0.00%	0.00%
Preferred stock, dividends per share, declared	$ 0	$ 0	$ 0
Preferred stock, dividend rate, percentage	0.00%	0.00%	0.00%
Unrecaptured Sec. 1250 [Member]
Common stock, dividends, per share, declared	$ 0.019	$ 0	$ 0
Common stock dividend rate percentage	2.90%	0.00%	0.00%
Preferred stock, dividends per share, declared	$ 0.307	$ 0	$ 0
Preferred stock, dividend rate, percentage	15.30%	0.00%	0.00%
Return of Capital [Member]
Common stock, dividends, per share, declared	$ 0.531	$ 0.621	$ 0.514
Common stock dividend rate percentage	81.10%	97.00%	84.70%
Preferred stock, dividends per share, declared	$ 0	$ 0	$ 0
Preferred stock, dividend rate, percentage	0.00%	0.00%	0.00%