Basis of Presentation (Details Textual) (USD $)	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010		Sep. 30, 2010 Correction [Member]	Dec. 31, 2008 Correction [Member]	Dec. 31, 2007 Correction [Member]
Basis of Presentation (Textuals)
Decrease to deferred income tax liabilities						$ 6,129,000
Goodwill	3,086,716,000	3,097,016,000	3,096,300,000	[1]	2,321,000	2,321,000
Increase in current taxes payable						8,450,000
Deferred income tax liabilities	800,770,000	849,448,000	856,631,000	[1]	6,706,000		14,785,000
Retained earnings	$ 1,372,822,000	$ 1,512,863,000	$ 1,591,969,000	[1]	$ (14,785,000)		$ 14,785,000

[1] As Restated, See Note 1