PARENTHETICAL DISCLOSURE OF CONDENSED CONSOLIDATED BALANCE SHEET (USD $) In Thousands, except Per Share data	Jun. 30, 2011	Dec. 31, 2010
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 4,467	$ 3,321
Stockholders equity:
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	200,000	200,000
Common stock, shares issued	125,975	125,839
Treasury stock, shares	1,240	1,230
Common stock, Shares Held in Employee Trust	573	597