CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current Assets:
Allowance for doubtful accounts	$ 4,718	$ 2,777
Stockholders' Equity:
Preferred Stock, par value	$ 1.00	$ 1.00
Preferred Stock, shares authorized	250,000	250,000
Preferred Stock, shares issued	0	0
Preferred Stock, shares outstanding	0	0
Common Stock, par value	$ 0.10	$ 0.10
Common Stock, shares authorized	100,000,000	100,000,000
Common Stock, shares outstanding	62,143,572	61,592,135
Treasury Stock, shares	2,008,986	2,008,986