CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) (unaudited) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Stockholders' Equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	400,000,000	400,000,000
Common stock, shares issued (in shares)	263,111,472	263,111,472
Treasury common stock at cost (in shares)	15,768,832	16,415,336