Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Buildings, less allowance for depreciation	$ 237,504	$ 226,396
Machinery and equipment, less allowance for depreciation	$ 522,136	$ 505,994
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	450,000,000	450,000,000
Common stock, shares issued	154,841,438	155,651,116
Common stock, shares outstanding	154,841,438	155,651,116