DEBT AND OTHER OBLIGATIONS (Details) (USD $)	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
DEBT AND OTHER OBLIGATIONS
Non-recourse funding obligations	$ 438,300,000	$ 532,400,000
Year-to-date weighted-average interest rate of non-recourse funding obligations (as a percent)	1.30%
Outstanding nonrecourse funding obligations repurchased at discount	94,100,000
Gain from repurchase of outstanding nonrecourse funding obligations	30,700,000
Outstanding non-recourse funding obligations of Golden Gate II Captive Insurance Company	575,000,000
Non-recourse funding obligations held by affiliates	136,700,000
Line of credit, current borrowing capacity	500,000,000
Line of credit, maximum borrowing capacity	600,000,000
Line of credit, amount outstanding	$ 135,000,000
Interest rate added to the base rate (as a percent)	0.40%