SUBSEQUENT EVENTS (Details) (2012 Credit Facility, USD $)	1 Months Ended
	Jul. 31, 2012	Jul. 17, 2012
SUBSEQUENT EVENTS
Line of credit, maximum borrowing capacity		750,000,000
Maximum principal amount up to which commitment under the Credit Facility can be increased		1,000,000,000
Administrative agent's prime rate
SUBSEQUENT EVENTS
Base of floating rate interest payments	Administrative Agent's prime rate
Federal funds rate
SUBSEQUENT EVENTS
Base of floating rate interest payments	Federal Funds rate
Interest rate added to the base rate (as a percent)		0.50%
LIBOR
SUBSEQUENT EVENTS
Base of floating rate interest payments	one-month LIBOR
Interest rate added to the base rate (as a percent)		1.00%
Subsequent events
SUBSEQUENT EVENTS
Line of credit, maximum borrowing capacity		750,000,000
Maximum principal amount up to which commitment under the Credit Facility can be increased		1,000,000,000
Subsequent events | Administrative agent's prime rate
SUBSEQUENT EVENTS
Base of floating rate interest payments	Administrative Agent's prime rate
Subsequent events | Federal funds rate
SUBSEQUENT EVENTS
Base of floating rate interest payments	Federal Funds rate
Interest rate added to the base rate (as a percent)		0.50%
Subsequent events | LIBOR
SUBSEQUENT EVENTS
Base of floating rate interest payments	one-month LIBOR
Interest rate added to the base rate (as a percent)		1.00%