Unaudited Condensed Consolidated Balance Sheet (Parenthetical) - $ / shares	Jun. 30, 2019	Dec. 31, 2018
Stockholders' Equity:
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	186,411,295	184,720,582
Common stock, shares outstanding	182,468,970	181,470,582