FEDERAL INCOME TAXES Tax Status of Dividends (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Contingency [Line Items]
Required Distribution Rate to Maintain REIT Status (in percent)	90.00%
Ordinary income	75.00%	100.00%	95.00%
Qualified dividend	22.00%	0.00%	0.00%
Capital gain	3.00%	0.00%	5.00%
Total	100.00%	100.00%	100.00%