Accounts Receivable (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Accounts Receivable [Abstract]
End user	$ 555,999,000		$ 555,999,000		$ 627,573,000
Other	19,433,000		19,433,000		14,306,000
Less: Allowance for doubtful accounts	(61,580,000)		(61,580,000)		(73,571,000)
Accounts receivable, net	513,852,000		513,852,000		568,308,000
Bad debt expense	$ 18,100,000	$ 5,200,000	$ 46,400,000	$ 11,400,000