Balance Sheet Parenthetical (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
Property, Plant and Equipment:
Accumulated Depreciation	$ 139,844	$ 130,685
Stockholders' Equity:
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	200,000	200,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	26,457,300	26,091,067
Common Stock held in treasury, at cost	181,279	64,949