Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Common stock, par value	$ 2.00	$ 2.00
Common stock, shares authorized	400,000,000	400,000,000
Common stock, issued	187,283,197	186,811,642
Treasury stock, at cost	259,699	257,556
Accumulated other comprehensive loss, taxes	$ 36,698	$ 20,672