Components of Statement of Income of the CFE (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Collateralized Securities Transactions [Line Items]
Interest expense	$ (22,746)	$ (27,314)
Net interest margin	48,391	59,803
Gain on mortgage loans	2,007	244
Net loss	(71,165)	$ (34,535)
CFE
Collateralized Securities Transactions [Line Items]
Interest income	1,819
Interest expense	(406)
Net interest margin	1,413
Gain on mortgage loans	1,201
Loss on collateralized borrowings	(358)
Operating expenses	(26)
Net loss	$ 2,230