Other Data (Details 1) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Characterization of distributions on common stock
Ordinary income per share	$ 0.61	$ 0.50	$ 0.27
Return of capital per share	0.08	0.70	0.80
Unrecaptured section 1250 gain per share	0.51	0.00	0.13
Common stock distributions per share	$ 1.2	$ 1.2	$ 1.2
Ordinary income in percent of common stock distribution	51.00%	42.00%	22.20%
Return of capital in percent of common stock distribution	6.70%	58.00%	66.30%
Unrecaptured section 1250 gain in percent of common stock distribution	42.30%	0.00%	11.50%
Common stock distribution in percentage	100.00%	100.00%	100.00%