PARENTHETICAL DISCLOSURE OF CONSOLIDATED BALANCE SHEET (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2,325	$ 3,321
Stockholders equity [Abstract]
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	200,000	200,000
Common stock, shares issued	126,142	125,839
Treasury stock, shares	1,298	1,230
Common stock, Shares Held in Employee Trust	581	597