Consolidated Statements of Stockholders' Equity and Comprehensive Income (Unaudited) (USD $) In Thousands, except Share data	Total	Series A Convertible Preferred Stock	Convertible Perpetual Preferred Stock, Series B-1	Common Stock	Accumulated Other Comprehensive Income (loss)	Additional Paid-in Capital	Accumulated Deficit
Beginning Balance at Dec. 31, 2010	$ 207,636	$ 0	$ 13	$ 3,933	$ (5,861)	$ 10,420,604	$ (10,211,053)
Beginning Balance, shares at Dec. 31, 2010		0	12,500,000	3,933,195,112
Net income	355,624						355,624
Other comprehensive income:
Realized loss on XM Canada investment foreign currency translation adjustment	6,072				6,072
Foreign currency translation adjustment, net of tax of $5	187				187
Total comprehensive income	361,883
Issuance of common stock to employees and employee benefit plans, net of forfeitures	2,807			2		2,805
Issuance of common stock to employees and employee benefit plans, net of forfeitures, shares				1,562,496
Share-based payment expense	33,641					33,641
Exercise of options and vesting of restricted stock units	9,045			10		9,035
Exercise of options and vesting of restricted stock units, shares				10,065,433
Common stock issuance upon exercise of warrants				7		(7)
Common stock issuance upon exercise of warrants, shares				7,122,951
Ending Balance at Sep. 30, 2011	$ 615,012	$ 0	$ 13	$ 3,952	$ 398	$ 10,466,078	$ (9,855,429)
Ending Balance, shares at Sep. 30, 2011		0	12,500,000	3,951,945,992