Accounts Receivable (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Accounts Receivable [Abstract]
End user	$ 559,411,000		$ 559,411,000		$ 627,573,000
Other	28,747,000		28,747,000		14,306,000
Less: Allowance for doubtful accounts	(60,763,000)		(60,763,000)		(73,571,000)
Accounts receivable, net	527,395,000		527,395,000		568,308,000
Bad debt expense	$ 19,300,000	$ 20,300,000	$ 65,700,000	$ 31,600,000