CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (UNAUDITED) (Parenthetical) (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Issuance of common stock (in shares)	28,869	106,936
Purchase of common stock (in shares)		1,101
Dividends paid on common stock (in dollars per shares)	$ 0.34	$ 0.34