Unaudited Condensed Consolidated Balance Sheet (Parenthetical) - $ / shares	Jun. 30, 2015	Dec. 31, 2014
Stockholders' Equity:
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	208,205,991	205,458,331
Common stock, shares outstanding	201,751,035	204,866,770