Other Data (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Characterization of distributions on common stock
Ordinary income per share	$ 0.27	$ 0.63	$ 0.34
Return of capital per share	$ 0.80	$ 0.56	$ 0.80
Unrecaptured section 1250 gain per share	$ 0.13	$ 0.01	$ 0.06
Common stock distributions per share	$ 1.2	$ 1.2	$ 1.2
Ordinary income in percent of common stock distribution	22.20%	52.30%	28.50%
Return of capital in percent of common stock distribution	66.30%	47.10%	66.30%
Unrecaptured section 1250 gain in percent of common stock distribution	11.50%	0.60%	5.20%
Common stock distribution in percentage	100.00%	100.00%	100.00%