Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accounts and notes receivable, allowances	$ 14,472	$ 14,722
Property and equipment, accumulated depreciation	$ 128,867	$ 121,873
Preferred stock, par value	$ 100	$ 100
Preferred stock, authorized	10,000	10,000
Preferred stock, issued
Common stock, par value	$ 2	$ 2
Common stock, authorized	200,000	200,000
Common stock, issued	63,335	63,271
Common stock, outstanding	63,335	63,271