CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 552,436	$ 615,789
Reverse repurchase agreements	100,000	1,811,095
Securities borrowed	2,582,893	2,160,942
Investments, at fair value:
U.S. Treasury securities (including pledged assets of $1,113,027 and $752,076, respectively)	1,117,915	752,076
Agency mortgage-backed securities (including pledged assets of $63,897,873 and $107,466,084, respectively)	70,388,949	123,963,207
Agency debentures (including pledged assets of $2,931,261 and $981,727, respectively)	2,969,885	3,009,568
Investment in affiliates	139,447	234,120
Commercial real estate debt and preferred equity investments	1,583,969
Investments in commercial real estate	60,132
Corporate debt, held for investment	117,687	63,944
Receivable for investments sold	1,193,730	290,722
Accrued interest and dividends receivable	273,079	419,259
Receivable for investment advisory income (including from affiliates of $6,839 and $14,077, respectively)	6,839	17,730
Intangible for customer relationships (net of accumulated amortization of $0 and $5,779, respectively)		6,989
Goodwill	94,781	55,417
Interest rate swaps, at fair value	559,044
Other derivatives, at fair value	146,725	9,830
Other assets	34,949	41,607
Total assets	81,922,460	133,452,295
Liabilities:
U.S. Treasury securities sold, not yet purchased, at fair value	1,918,394	495,437
Repurchase agreements	61,781,001	102,785,697
Securities loaned	2,527,668	1,808,315
Payable for investments purchased	764,131	8,256,957
Payable for share buyback program		141,149
Convertible Senior Notes	825,262	825,541
Mortgages payable	19,332
Participation sold	14,065
Accrued interest payable	160,921	186,896
Dividends payable	284,230	432,154
Interest rate swaps, at fair value	1,141,828	2,584,907
Other derivatives, at fair value	55,518
Accounts payable and other liabilities	25,055	10,798
Total liabilities	69,517,405	117,527,851
Stockholders' Equity:
Common stock, par value $0.01 per share, 1,956,937,500 authorized, 947,432,862 and 947,213,204 issued and outstanding, respectively	9,474	9,472
Additional paid-in capital	14,765,761	14,740,774
Accumulated other comprehensive income (loss)	(2,748,933)	3,053,242
Accumulated deficit	(534,306)	(2,792,103)
Total stockholders' equity	12,405,055	15,924,444
Total liabilities and stockholders' equity	81,922,460	133,452,295
7.875% Series A Cumulative Redeemable Preferred Stock
Stockholders' Equity:
Cumulative Redeemable Preferred Stock	177,088	177,088
7.625% Series C Cumulative Redeemable Preferred Stock
Stockholders' Equity:
Cumulative Redeemable Preferred Stock	290,514	290,514
7.50% Series D Cumulative Redeemable Preferred Stock
Stockholders' Equity:
Cumulative Redeemable Preferred Stock	$ 445,457	$ 445,457