FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 4) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Carrying value and estimated fair value of the financial instruments not carried at fair value on the consolidated balance sheet
Loans held for investment	$ 409,943	$ 353,500
Financial Liabilities:
Convertible notes	67,411	67,289
Carrying Value | Level 3
Carrying value and estimated fair value of the financial instruments not carried at fair value on the consolidated balance sheet
Loans held for investment	409,943	353,500
Financial Liabilities:
Secured financing agreements	200,050	144,256
Convertible notes	67,411	67,289
Estimated Fair Value | Level 3
Carrying value and estimated fair value of the financial instruments not carried at fair value on the consolidated balance sheet
Loans held for investment	409,943	353,500
Financial Liabilities:
Secured financing agreements	200,050	144,256
Convertible notes	$ 67,411	$ 67,289