CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $)	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Statement Of Stockholders Equity [Abstract]
Cumulative Preferred Stock, par	$ 100	$ 100	$ 100
Cumulative Preferred Stock, authorized	400,000	400,000	400,000
Cumulative Preferred Stock, issued
Common Stock, par	$ 1.00	$ 1.00	$ 1.00
Common Stock, authorized	450,000,000	450,000,000	450,000,000
Common Stock, issued	194,683,376	194,616,470	194,345,426