Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2011		Dec. 31, 2010
Accounts receivable, allowance for doubtful accounts	$ 28,473	[1]	$ 20,863	[1]
Common Stock, par value	$ 0.01	[1]	$ 0.01	[1]
Common Stock, shares authorized	120,000,000	[1]	120,000,000	[1]
Common Stock, shares issued	72,739,924	[1]	70,752,670	[1]
Common Stock, shares outstanding	72,739,924	[1]	70,752,670	[1]
Preferred stock, par value	$ 0.01	[1]	$ 0.01	[1]
Preferred stock, shares authorized	7,000,000	[1]	7,000,000	[1]
Preferred Stock, shares issued	0	[1]	0	[1]
Treasury stock, shares	246,037,000	[1]	246,037,000	[1]

[1] Restated