CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (UNAUDITED) (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2011	Mar. 31, 2010
Issuance of common stock (in shares)	14,538	60,543
Purchase of common stock (in shares)		1,101
Dividends paid on common stock (in dollars per shares)	$ 0.17	$ 0.17