CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY [Abstract]
Dividends paid to public stockholders (in dollars per share)	$ 0.77	$ 0.73	$ 0.72
Dividends paid to affiliate (in dollars per share)	$ 0.77	$ 0.73	$ 0.72