CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 25,388	$ 20,018
Receivables
Interest	2,535	2,366
Sold securities receivable	21,609	41,321
Other	15	11
Mortgage-backed securities, at fair value
Available-for-sale	175,655	179,566
Trading	774,843	636,872
Other investments	2,882	2,946
Derivative assets, at fair value	299	504
Deposits	69,337	71,079
Prepaid expenses and other assets	81	377
Total assets	1,072,644	955,060
Liabilities:
Repurchase agreements	668,618	647,977
Interest payable	342	504
Accrued compensation and benefits	1,314	6,177
Dividend payable	8,322	6,785
Derivative liabilities, at fair value	63,592	63,024
Purchased securities payable	77,431	15,820
Accounts payable, accrued expenses and other liabilities	16,906	16,401
Long-term debt	15,000	15,000
Total liabilities	851,525	771,688
Commitments and contingencies (Note 7)
Equity:
Preferred stock, $0.01 par value, 25,000,000 shares authorized, none issued and outstanding	0	0
Additional paid-in capital	1,548,903	1,508,713
Accumulated other comprehensive income, net of taxes	33,464	38,367
Accumulated deficit	(1,361,342)	(1,363,785)
Total equity	221,119	183,372
Total liabilities and equity	1,072,644	955,060
Class A [Member]
Equity:
Common stock	88	71
Class B [Member]
Equity:
Common stock	$ 6	$ 6