Valuation And Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allowance For Doubtful Accounts [Member]
Beginning Balance	$ 23,900	$ 22,507	$ 26,893
Additions Charged to Costs and Expenses	3,983	3,505	1,749
Additions Charged to Other Accounts	370	3,120
Deductions	(9,328)	(5,232)	(6,135)
Ending Balance	18,925	23,900	22,507
Valuation Allowance Of Deferred Tax Assets [Member]
Beginning Balance	232,147	166,083	110,194
Additions Charged to Costs and Expenses	14,845	66,064	55,889
Deductions	(15,556)
Ending Balance	$ 231,436	$ 232,147	$ 166,083