CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents	$ 994,198	$ 282,626
Reverse repurchase agreements	860,866	1,006,163
Investments, at fair value:
U.S. Treasury Securities (including pledged assets of $352,820 and $660,823, respectively)	928,547	1,100,447
Securities borrowed	928,732	216,676
Agency mortgage-backed securities (including pledged assets of $90,406,535 and $67,787,023, respectively)	104,251,055	78,440,330
Agency debentures (including pledged assets of $567,383 and $1,068,869, respectively)	889,580	1,108,261
Investments in affiliates	211,970	252,863
Equity securities	3,891
Corporate debt, held for investment	52,073	21,683
Receivable for investments sold		151,460
Accrued interest and dividends receivable	409,023	345,250
Receivable from Prime Broker	3,272	3,272
Receivable for advisory and service fees (including from affiliates of $16,245 and $13,020, respectively)	19,550	16,172
Intangible for customer relationships, (net of accumulated amortization of $5,432 million and $9,833, respectively)	10,807	9,290
Goodwill	42,030	42,030
Interest rate swaps, at fair value		2,561
Other derivative contracts, at fair value	113	2,607
Other assets	24,295	24,899
Total assets	109,630,002	83,026,590
Liabilities:
U.S. Treasury Securities sold, not yet purchased, at fair value	826,912	909,462
Repurchase agreements	84,097,885	65,533,537
Securities loaned, at fair value	804,901	217,841
Payable for investments purchased	4,315,796	4,575,026
Convertible Senior Notes	539,913	600,000
Accrued interest payable	138,965	115,766
Dividends payable	552,806	404,220
Interest rate swaps, at fair value	2,552,687	754,439
Other derivative contracts, at fair value		2,446
Accounts payable and other liabilities	7,223	8,921
Total liabilities	93,837,088	73,121,658
6.00% Series B Cumulative Convertible Preferred Stock: 4,600,000 shares authorized, 1,331,849 and 1,652,047 shares issued and outstanding, respectively	32,272	40,032
Stockholders' Equity:
7.875% Series A Cumulative Redeemable Preferred Stock: 7,412,500 authorized, issued and outstanding	177,088	177,088
Common stock, par value $0.01 per share, 1,987,987,500 authorized, 970,161,647 and 631,594,205 issued and outstanding, respectively	9,702	6,316
Additional paid-in capital	15,068,870	9,175,245
Accumulated other comprehensive income (loss)	3,008,988	1,164,642
Accumulated deficit	(2,504,006)	(658,391)
Total stockholders' equity	15,760,642	9,864,900
Total liabilities, Series B Cumulative Convertible Preferred Stock and stockholders' equity	$ 109,630,002	$ 83,026,590