Income Taxes (Schedule Of Per Share Distributions To Stockholders) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Income Taxes [Abstract]
Common share distribution	$ 0.800000		$ 0.800000		$ 0.800000
Ordinary income	$ 0.300844		$ 0.388128		$ 0.471792
Capital gains	$ 0.031396	[1]	$ 0.027724	[1]	$ 0.003708	[1]
Unrecaptured Sec. 1250 gain	$ 0.031396		$ 0.022784		$ 0.003708
Return of capital	$ 0.467760		$ 0.384148		$ 0.324500
Allocable to next year

[1] Capital gains include unrecaptured Sec. 1250 gains.