OTHER INCOME, ASSETS AND LIABILITIES - Schedule of Other Assets and Other Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Other Assets
Margin receivable, net	$ 36,934		$ 59,021
Interest and other receivables	11,320		10,455
Deferred financing costs, net	2,817	[1]	4,446	[1]
Principal paydown receivable	3,761		3,595
Receivable from government agency	9,380		9,108
Call rights	3,828		3,728
Other assets	8,661		9,516
Other Assets	76,701		99,869
Other Liabilities
Interest payable	7,516		7,857
Accounts payable	16,068		28,059
Derivative liabilities	21,127		14,220
Current taxes payable	47		2,349
Other liabilities	19		20
Accrued Expenses and Other Liabilities	$ 44,777		$ 52,505

[1] Deferred financing costs are net of accumulated amortization of $5.4 million and $8.8 million as of March 31, 2015 and December 31, 2014, respectively.