VARIABLE INTEREST ENTITIES FINANCING RECEIVABLES (Loan Portfolio Aging Analysis as of the Dates Indicated at Cost Basis) (Details) RSO (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2012 RSO [Member]	Dec. 31, 2011 RSO [Member]	Dec. 31, 2012 RSO [Member] Whole Loans [Member]	Dec. 31, 2011 RSO [Member] Whole Loans [Member]	Dec. 31, 2012 RSO [Member] B Notes [Member]	Dec. 31, 2011 RSO [Member] B Notes [Member]	Dec. 31, 2012 RSO [Member] Mezzanine Loans [Member]	Dec. 31, 2011 RSO [Member] Mezzanine Loans [Member]	Dec. 31, 2012 RSO [Member] Bank Loans [Member]	Dec. 31, 2011 RSO [Member] Bank Loans [Member]	Dec. 31, 2012 RSO [Member] Loans Receivable - Related Party [Member]	Dec. 31, 2011 RSO [Member] Loans Receivable - Related Party [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days			$ 1,549	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 1,549	$ 0	$ 0	$ 0
60-89 Days			0	0	0	0	0	0	0	0	0	0	0	0
Greater than 90 days	2,695	2,141	3,891	0	0	0	0	0	0	0	3,891	0	0	0
Total Past Due	57,542	61,815	5,440	0	0	0	0	0	0	0	5,440	0	0	0
Current	4,501	193,249	1,863,249	1,812,232	567,938	544,673	16,327	16,435	82,786	67,874	1,187,874	1,173,753	8,324	9,497
Total Loans Receivable			1,868,689	1,812,232	567,938	544,673	16,327	16,435	82,786	67,874	1,193,314	1,173,753	8,324	9,497
Total Loans Greater Than 90 days and accruing			$ 0	$ 0	$ 0		$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0