Equity Summary of Income Tax Status of Dividends Per Share Paid (Details) (USD $)	3 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Equity [Abstract]
Ordinary income													$ 0.83	$ 0.56	$ 0.22
Return of capital													$ 0.02	$ 0.28	$ 0.58
Total	$ 0.22	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.17	$ 0.85	$ 0.84	$ 0.80
Ordinary income													97.60%	66.70%	27.50%
Return of capital													2.40%	33.30%	72.50%
Total													100.00%	100.00%	100.00%