Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Statement of Financial Position
Preferred Stock, par or stated value	$ 0.01	$ 0.01
Preferred Stock, shares authorized	3,000,000	3,000,000
Preferred Stock, shares issued	0	0
Common Stock, par or stated value	$ 0.01	$ 0.01
Common Stock, shares authorized	300,000,000	300,000,000
Common Stock, shares issued	151,804,037	150,080,927