CONSOLIDATED STATEMENT OF CHANGES IN EQUITY Parenthetical (USD $)	9 Months Ended
	Sep. 30, 2011
Statement of Stockholders' Equity Parenthetical [Abstract]
Common dividends declared - $1.56 per share	$ 1.56
Issuance of 15,000 shares of common stock, common stock offering, net of expenses	15,000
Issuance of 6,000 shares of common stock, options exercised	6,000
Issuance of 4,528 shares of common stock, dividend reinvestment plan	4,528
Withheld 3,564 shares of common stock to satisfy tax withholding obligations in connection with the vesting of restricted stock	3,564