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Note Payable To EMC (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
Note Payable To EMC (Details) (USD $)	Jun. 30, 2011	Sep. 30, 2007	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 EMC [Member]	Jun. 30, 2011 EMC [Member]	Jun. 30, 2012 EMC [Member]	Jun. 30, 2011 EMC [Member]	Dec. 31, 2011 EMC [Member]	Apr. 30, 2007 EMC [Member]
Note payable to EMC					$ 450,000,000		$ 450,000,000		$ 450,000,000	$ 800,000,000
Repayments of principal	0	350,000,000	0	0	0
LIBOR period, days			90
Spread over LIBOR (basis points)			55.00%
Interest expense with EMC, net					$ 1,200,000	$ 1,000,000	$ 2,400,000	$ 1,900,000

The amount for notes payable (written promise to pay), payable to related parties, which are due after one year (or one business cycle).

The cash outflow for a borrowing supported by a written promise to pay an obligation.