ARMOUR Residential REIT (ARR) 10-K 24 Feb 15 2014 FY Annual report Financial data

Document_And_Entity_Informatio

Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Feb. 23, 2015	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	Armour Residential REIT, Inc.
Entity Central Index Key	1428205
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Document Type	10-K
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	FY
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		353,163,549
Entity Public Float			$1,526,549,809

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets
Cash	$494,561	$496,478
Cash collateral posted to counterparties	129,004	35,917
Agency Securities, available for sale, at fair value (including pledged securities of $14,370,847 and $13,832,482)	15,297,529	14,648,178
Receivable for unsettled sales (including pledged securities of $251,251in 2014)	260,598	0
Derivatives, at fair value	60,518	508,988
Principal payments receivable	93	70
Accrued interest receivable	41,915	42,034
Prepaid and other assets	1,580	852
Total Assets	16,285,798	15,732,517
Liabilities:
Repurchase agreements	13,881,921	13,151,504
Cash collateral posted by counterparties	48,240	387,845
Payable for unsettled purchases	445,292	159,159
Derivatives, at fair value	137,393	102,795
Accrued interest payable- repurchase agreements	7,012	6,629
Accounts payable and other accrued expenses	16,649	23,357
Total Liabilities	14,536,507	13,831,289
Commitments and contingencies
Preferred stock, $0.001 par value, 50,000 shares authorized;
Common stock, $0.001 par value, 1,000,000 shares authorized, 353,159 and 357,613 shares issued and outstanding at December 31, 2014 and December 31, 2013	353	358
Additional paid-in capital	2,717,545	2,734,480
Accumulated deficit	-1,052,969	-643,138
Accumulated other comprehensive income (loss)	84,354	-190,480
Total Stockholders’ Equity	1,749,291	1,901,228
Total Liabilities and Stockholders’ Equity	16,285,798	15,732,517
Series A Preferred Stock
Preferred stock, $0.001 par value, 50,000 shares authorized;
Preferred Stock, Value, Issued	2	2
Series B Preferred Stock
Preferred stock, $0.001 par value, 50,000 shares authorized;
Preferred Stock, Value, Issued	$6	$6

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Agency securities pledged	$14,370,847	$13,832,482
Unsettled securities pledged	251,251
Preferred stock, par value (in dollars per share)	$0.00	$0.00
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, par value (in Dollars per share)	$0.00	$0.00
Common stock, shares authorized (in Shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in Shares)	353,159,000	357,613,000
Common stock, shares outstanding (in Shares)	353,159,000	357,613,000
Series A Preferred Stock
Preferred stock, par value (in dollars per share)	$0.00	$0.00
Preferred stock, shares authorized (in shares)	9,610,000
Preferred stock, shares issued	2,181,000	2,181,000
Preferred stock, shares outstanding	2,181,000	2,181,000
Preferred stock, aggregate liquidation preference	54,514	54,514
Preferred stock, dividend rate	8.25%	8.25%
Series B Preferred Stock
Preferred stock, par value (in dollars per share)	$0.00	$0.00
Preferred stock, shares authorized (in shares)	6,210,000
Preferred stock, shares issued	5,650,000	5,650,000
Preferred stock, shares outstanding	5,650,000	5,650,000
Preferred stock, aggregate liquidation preference	$141,250	$141,250
Preferred stock, dividend rate	7.88%	7.88%

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (Unaudited) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Income Statement [Abstract]
Interest income, net of amortization of premium on Agency Securities	$450,927		$505,443		$388,994
Interest expense- repurchase agreements	-59,562		-83,113		-61,195
Interest expense- U.S. Treasury Securities sold short	-5,551		-1,437		0
Net Interest Income	385,814		420,893		327,799
Other Income (Loss):
Realized gain (loss) on sale of Agency Securities (reclassified from Other comprehensive income (loss))	68,770		-593,498		40,627
Other than temporary impairment of Agency Securities (reclassified from Other comprehensive income (loss))	0		-401,541		0
Gain (loss) on short sale of U.S. Treasury Securities	-14,688		15,508		0
Other income	0		0		1,043
Subtotal	54,082		-979,531		41,670
Realized loss on derivatives	-118,716	[1]	-135,908	[1]	-63,039	[1]
Unrealized gain (loss) on derivatives	-462,630		544,643		-58,774
Subtotal	-581,346		408,735		-121,813
Total Other Loss	-527,264		-570,796		-80,143
Expenses:
Management fee	27,857		28,141		19,459
Professional fees	3,735		3,311		2,009
Insurance	726		543		291
Compensation	2,796		3,047		1,838
Other	2,484		2,109		1,777
Total Expenses	37,598		37,151		25,374
Income (loss) before taxes	-179,048		-187,054		222,282
Income tax benefit	0		10		24
Net Income (Loss)	-179,048		-187,044		222,306
Dividends declared on preferred stock	-15,620		-14,213		-1,964
Net Income (Loss) available (related) to common stockholders	($194,668)		($201,257)		$220,342
Net income (loss) available (related) per share to common stockholders
Basic (in usd per share)	($0.54)		($0.55)		$0.99
Diluted (in usd per share)	($0.54)		($0.55)		$0.98
Dividends declared per common share (in usd per share)	$0.60		$0.81		$1.20
Weighted average common shares outstanding:
Basic (in shares)	357,233		362,830		223,627
Diluted (in shares)	357,233		362,830		224,263
[1]	Interest expense related to our interest rate swap contracts is recorded as realized loss on derivatives on the consolidated statements of operations. For additional information, see Note 8 to the consolidated financial statements.

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	($179,048)	($187,044)	$222,306
Other comprehensive income (loss):
Reclassification adjustment for realized (gain) loss on sale of available for sale Agency Securities	-68,770	593,498	-40,627
Reclassification adjustment for other than temporary impairment of available for sale Agency Securities	0	401,541	0
Net unrealized gain (loss) on available for sale Agency Securities	343,604	-1,416,083	222,443
Other comprehensive income (loss)	274,834	-421,044	181,816
Comprehensive Income (Loss)	$95,786	($608,088)	$404,122

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (USD $)	Total	Series A Preferred Stock	Series B Preferred Stock	Preferred Stock	Preferred Stock	Additional Paid-in Capital	Additional Paid-in Capital	Additional Paid-in Capital	Additional Paid-in Capital	Common Stock	Accumulated Deficit	Accumulated Deficit	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
In Thousands, unless otherwise specified				Series A Preferred Stock	Series B Preferred Stock		Series A Preferred Stock	Series B Preferred Stock	Common Stock			Series A Preferred Stock	Series B Preferred Stock
Balance at Dec. 31, 2011	$626,606			$0	$0	$678,641	$0	$0	$678,641	$95	($100,878)			$48,748
Balance (in Shares) at Dec. 31, 2011				0	0					95,437
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred Dividends Declared		-1,964										-1,964
Common stock dividends	-268,762										-268,762
Issuance of Preferred stock, net (in shares)		48,794		2			48,792
Issuance of Preferred stock, net				2,006
Issuance of common stock, net (in Shares)										213,473
Issuance of common stock, net	1,498,238					1,498,025			1,498,025	213
Stock based compensation, net of withholding requirements	741					740			740	1
Stock based compensation, net of withholding requirements (in Shares)										103
Net Loss	222,306										222,306
Other comprehensive income	181,816													181,816
Balance at Dec. 31, 2012	2,307,775			2	0	2,226,198	48,792	0	2,177,406	309	-149,298			230,564
Balance (in Shares) at Dec. 31, 2012				2,006	0					309,013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred Dividends Declared		-4,480	-9,733									-4,480	-9,733
Common stock dividends	-292,583										-292,583
Issuance of Preferred stock, net (in shares)		4,380	136,553		6		4,380	136,547
Issuance of Preferred stock, net				175	5,650
Issuance of common stock, net (in Shares)										65,067
Issuance of common stock, net	438,582					438,517			438,517	65
Stock based compensation, net of withholding requirements	1,516					1,515			1,515	1
Stock based compensation, net of withholding requirements (in Shares)										304
Common stock repurchased	-72,694					-72,677			-72,677	-17
Common stock repurchased (in Shares)										-16,771
Net Loss	-187,044										-187,044
Other comprehensive income	-421,044													-421,044
Balance at Dec. 31, 2013	1,901,228			2	6	2,734,480	53,172	136,547	2,544,761	358	-643,138			-190,480
Balance (in Shares) at Dec. 31, 2013				2,181	5,650					357,613
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred Dividends Declared		-4,497	-11,123									-4,497	-11,123
Common stock dividends	-215,163										-215,163
Issuance of common stock, net (in Shares)										66
Issuance of common stock, net						269			269	269
Stock based compensation, net of withholding requirements	1,153					1,153			1,153
Stock based compensation, net of withholding requirements (in Shares)										284
Common stock repurchased	-18,362					-18,357			-18,357	-5
Common stock repurchased (in Shares)										-4,804
Net Loss	-179,048										-179,048
Other comprehensive income	274,834													274,834
Balance at Dec. 31, 2014	$1,749,291			$2	$6	$2,717,545	$53,172	$136,547	$2,527,826	$353	($1,052,969)			$84,354
Balance (in Shares) at Dec. 31, 2014				2,181	5,650					353,159

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows From Operating Activities:
Net Income (Loss)	($179,048,000)	($187,044,000)	$222,306,000
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Net amortization of premium on Agency Securities	82,965,000	157,645,000	123,896,000
Realized (gain) loss on sale of Agency Securities	-68,770,000	593,498,000	-40,627,000
Other than temporary impairment of Agency Securities	0	401,541,000	0
(Gain) Loss on short sale of U.S. Treasury Securities	14,688,000	-15,508,000	0
Stock based compensation	1,153,000	1,516,000	741,000
Changes in operating assets and liabilities:
(Increase) decrease in accrued interest receivable	703,000	13,411,000	-36,855,000
Increase in prepaid and other assets	-728,000	-448,000	-236,000
(Increase) decrease in derivatives, at fair value	483,068,000	-591,366,000	63,446,000
Increase (decrease) in accrued interest payable- repurchase agreements	383,000	-3,435,000	7,910,000
Increase (decrease) in accounts payable and other accrued expenses	-19,314,000	-704,000	3,100,000
Net cash provided by operating activities	315,100,000	369,106,000	343,681,000
Cash Flows From Investing Activities:
Purchases of Agency Securities	-12,505,285,000	-15,029,408,000	-20,493,773,000
Principal repayments of Agency Securities	1,806,581,000	3,135,502,000	2,629,142,000
Proceeds from sales of Agency Securities	10,334,920,000	15,611,917,000	3,853,612,000
Disbursements on reverse repurchase agreements	-18,076,531,000	-11,239,305,000	0
Receipts from reverse repurchase agreements	18,076,531,000	11,239,305,000	0
(Increase) decrease in cash collateral	-432,692,000	617,480,000	-118,353,000
Net cash provided by (used in) investing activities	-796,476,000	4,335,491,000	-14,129,372,000
Cash Flows From Financing Activities:
Issuance of common stock, net of expenses	263,000	438,566,000	1,498,233,000
Proceeds from repurchase agreements	80,982,646,000	122,761,377,000	127,326,357,000
Principal repayments on repurchase agreements	-80,252,229,000	-127,975,968,000	-114,297,294,000
Proceeds from short sales of U.S. Treasury Securities	2,005,363,000	2,783,711,000	0
Purchases of U.S. Treasury Securities	-2,020,051,000	-2,768,203,000	0
Common stock dividends paid	-215,163,000	-292,592,000	-269,503,000
Common stock repurchased	-5,750,000	-53,012,000	0
Net cash provided by (used in) financing activities	479,459,000	-4,979,401,000	14,304,601,000
Net increase (decrease) in cash	-1,917,000	-274,804,000	518,910,000
Cash - beginning of year	496,478,000	771,282,000	252,372,000
Cash - end of year	494,561,000	496,478,000	771,282,000
Supplemental Disclosure:
Cash paid during the year for interest	215,573,000	226,549,000	85,139,000
Non-Cash Investing and Financing Activities:
Receivable for unsettled sales	260,598,000	0	668,244,000
Payable for unsettled purchases	445,292,000	159,159,000	0
Net unrealized gain (loss) on available for sale Agency Securities	343,604,000	-1,416,083,000	222,443,000
Amounts receivable for issuance of common stock	6,000	16,000	5,000
Amounts receivable for issuance of preferred stock	0	0	22,000
Amounts payable for common stock repurchased	-12,612,000	-19,682,000	0
Series A Preferred Stock
Cash Flows From Financing Activities:
Proceeds from issuance of preferred stock, net of expenses	0	4,380,000	48,772,000
Preferred dividends paid	-4,497,000	-4,480,000	-1,964,000
Series B Preferred Stock
Cash Flows From Financing Activities:
Proceeds from issuance of preferred stock, net of expenses	0	136,553,000	0
Preferred dividends paid	($11,123,000)	($9,733,000)	$0

Basis_of_Presentation

Basis of Presentation	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation
	The accompanying consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the U.S. (“GAAP”). The consolidated financial statements include the accounts of ARMOUR Residential REIT, Inc. and its subsidiary. All intercompany accounts and transactions have been eliminated. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Significant estimates affecting the accompanying consolidated financial statements include the valuation of Agency Securities (as defined below) and derivative instruments.

Organization_and_Nature_of_Bus

Organization and Nature of Business Operations	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Nature of Business Operations	Organization and Nature of Business Operations
	References to “we,” “us,” “our,” "ARMOUR" or the “Company” are to ARMOUR Residential REIT, Inc. References to "ACM" are to ARMOUR Capital Management LP, a Delaware limited partnership, formerly known as ARMOUR Residential Management LLC. On December 19, 2014, ARMOUR Residential Management LLC, our external manager under the Management Agreement, changed its name to ARMOUR Capital Management LP and converted from a Delaware limited liability company to a Delaware limited partnership and continued as the manager under the same Management Agreement (the "Conversion").
	We are an externally managed Maryland corporation incorporated in 2008, managed by ACM, an investment advisor registered with the SEC (see Note 9, "Commitments and Contingencies" and Note 14, “Related Party Transactions” for additional discussion). We invest in residential mortgage backed securities issued or guaranteed by a United States (“U.S.”) Government-sponsored entity (“GSE”), such as the Federal National Mortgage Association (Fannie Mae), the Federal Home Loan Mortgage Corporation (Freddie Mac) or guaranteed by the Government National Mortgage Administration (Ginnie Mae) (collectively, "Agency Securities"). We also may invest in other securities backed by residential mortgages for which the payment of principal and interest is not guaranteed by a GSE or government agency (collectively, "Non-Agency Securities"). While we remain committed to investing in Agency Securities for so long as an adequate supply and pricing exists, we have the flexibility to invest in Non-Agency Securities and respond to changes in GSE policy as needed. At December 31, 2014 and December 31, 2013, Agency Securities accounted for 100% of our securities portfolio. It is expected that the percentage will continue to be 100% or close thereto. Our securities portfolio consists primarily of Agency Securities backed by fixed rate home loans. From time to time, a portion of our assets may be invested in Agency Securities backed by hybrid adjustable rate and adjustable rate home loans as well as unsecured notes and bonds issued by GSEs, U.S. Treasuries and money market instruments, subject to certain income tests we must satisfy for our qualification as a real estate investment trust (“REIT”).
	We have elected to be taxed as a REIT under the Internal Revenue Code (“the Code”). Our qualification as a REIT depends on our ability to meet, on a continuing basis, various complex requirements under the Code relating to, among other things, the sources of our gross income, the composition and values of our assets, our distribution levels and the concentration of ownership of our capital stock. We believe that we are organized in conformity with the requirements for qualification as a REIT under the Code and our manner of operations enables us to meet the requirements for taxation as a REIT for federal income tax purposes.
	As a REIT, we will generally not be subject to federal income tax on the REIT taxable income that we currently distribute to our stockholders. If we fail to qualify as a REIT in any taxable year and do not qualify for certain statutory relief provisions, we will be subject to federal income tax at regular corporate rates. Even if we qualify as a REIT for federal income tax purposes, we may still be subject to some federal, state and local taxes on our income.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies
	Cash
	Cash includes cash on deposit with financial institutions. We may maintain deposits in federally insured financial institutions in excess of federally insured limits. However, management believes we are not exposed to significant credit risk due to the financial position and creditworthiness of the depository institutions in which those deposits are held.
	Cash Collateral Posted To/By Counterparties
	Cash collateral posted to/by counterparties represents cash posted by us to counterparties or posted by counterparties to us as collateral for our interest rate swap contracts (including swaptions), Eurodollar Futures Contracts (“Futures Contracts”) and repurchase agreements on our Agency Securities.
	Agency Securities, Available For Sale
	We generally intend to hold most of our Agency Securities for extended periods of time. We may, from time to time, sell any of our Agency Securities as part of the overall management of our securities portfolio. Management determines the appropriate classifications of the securities at the time they are acquired and evaluates the appropriateness of such classifications at each balance sheet date. At December 31, 2014 and December 31, 2013, all of our Agency Securities were classified as available for sale securities. Agency Securities classified as available for sale are reported at their estimated fair values with unrealized gains and losses excluded from earnings and reported as part of the consolidated statements of comprehensive income (loss).
	Receivables and Payables for Unsettled Sales and Purchases
	We account for purchases and sales of securities on the trade date, including purchases and sales for forward settlement. Receivables and payables for unsettled trades represent the agreed trade price times the outstanding balance of the securities at the balance sheet date.
	Accrued Interest Receivable and Payable
	Accrued interest receivable includes interest accrued between payment dates on Agency Securities. Accrued interest payable includes interest payable on our repurchase agreements and may, at certain times, contain interest payable on U.S. Treasury Securities sold short.
	Repurchase Agreements
	We finance the acquisition of our Agency Securities through the use of repurchase agreements. Our repurchase agreements are secured by our Agency Securities and bear interest rates that have historically moved in close relationship to the Federal Funds Rate and the London Interbank Offered Rate (“LIBOR”). Under these repurchase agreements, we sell Agency Securities to a lender and agree to repurchase the same Agency Securities in the future for a price that is higher than the original sales price. The difference between the sales price that we receive and the repurchase price that we pay represents interest paid to the lender. A repurchase agreement operates as a financing arrangement under which we pledge our Agency Securities as collateral to secure a loan which is equal in value to a specified percentage of the estimated fair value of the pledged collateral. We retain beneficial ownership of the pledged collateral.  At the maturity of a repurchase agreement, we are required to repay the loan and concurrently receive back our pledged collateral from the lender or, with the consent of the lender, we may renew such agreement at the then prevailing interest rate. The repurchase agreements may require us to pledge additional assets to the lender in the event the estimated fair value of the existing pledged collateral declines.
	In addition to the repurchase agreement financing discussed above, at certain times we have entered into reverse repurchase agreements with certain of our repurchase agreement counterparties. Under a typical reverse repurchase agreement, we purchase U.S. Treasury Securities from a borrower in exchange for cash and agree to sell the same securities in the future in exchange for a price that is higher than the original purchase price. The difference between the purchase price originally paid and the sale price represents interest received from the borrower. Reverse repurchase agreement receivables and repurchase agreement liabilities are presented net when they meet certain criteria, including being with the same counterparty, being governed by the same master repurchase agreement ("MRA"), settlement through the same brokerage or clearing account and maturing on the same day. We did not have any reverse repurchase agreements outstanding at December 31, 2014 and December 31, 2013.
	Obligations to Return Securities Received as Collateral, at Fair Value
	At certain times, we also sell to third parties the U.S. Treasury Securities received as collateral for reverse repurchase agreements and recognize the resulting obligation to return said U.S. Treasury Securities as a liability on our consolidated balance sheets. Interest is recorded on the repurchase agreements, reverse repurchase agreements and U.S. Treasury Securities sold short on an accrual basis and presented as interest expense. Both parties to the transaction have the right to make daily margin calls based on changes in the fair value of the collateral received and/or pledged.
	Derivatives, at Fair Value
	We recognize all derivatives as either assets or liabilities at fair value on our consolidated balance sheets. All changes in the fair values of our derivatives are reflected in our consolidated statements of operations. We designate derivatives as hedges for tax purposes and any unrealized derivative gains or losses would not affect our distributable net taxable income.
	Preferred Stock
	At December 31, 2014, we were authorized to issue up to 50,000 shares of preferred stock, par value $0.001 per share, with such designations, voting and other rights and preferences as may be determined from time to time by our Board of Directors (“Board”) or a committee thereof. We have designated 9,610 shares as 8.250% Series A Preferred Stock and 6,210 shares as 7.875% Series B Preferred Stock. At December 31, 2014, a total of 34,180 shares of our authorized preferred stock remain available for designation as future series.
	Series A Cumulative Preferred Shares (“Series A Preferred Stock”
	At December 31, 2014 and December 31, 2013, we had 2,181 shares of Series A Preferred Stock issued and outstanding with a par value of $0.001 per share and a liquidation preference of $25.00 per share, or $54,514 in the aggregate. Shares designated as Series A Preferred Stock but unissued totaled 7,429 at December 31, 2014. At December 31, 2014 and December 31, 2013, there were no accrued or unpaid dividends on the Series A Preferred Stock. The Series A Preferred Stock is entitled to a dividend at a rate of 8.250% per year based on the $25.00 per share liquidation preference before the common stock is entitled to receive any dividends. The Series A Preferred Stock is redeemable at $25.00 per share plus accrued and unpaid dividends exclusively at our option commencing on June 7, 2017 (subject to our right under limited circumstances to redeem the Series A Preferred Stock earlier in order to preserve our qualification as a REIT). The Series A Preferred Stock is senior to our common stock and therefore in the event of liquidation, dissolution or winding up, the Series A Preferred Stock will receive a liquidation preference of $25.00 per share plus accumulated and unpaid dividends before distributions are paid to holders of our common stock, with no right or claim to any of our remaining assets thereafter. The Series A Preferred Stock generally does not have voting rights, except if we fail to pay dividends on the Series A Preferred Stock for eighteen months, whether or not consecutive. Under such circumstances, the Series A Preferred Stock will be entitled to vote to elect two additional directors to the Board, until all unpaid dividends have been paid or declared and set aside for payment. The Series A Preferred Stock has no stated maturity, is not subject to any sinking fund or mandatory redemption and will remain outstanding indefinitely unless repurchased or redeemed by us or converted into our common stock in connection with a change of control by the holders of Series A Preferred Stock.
	Series B Cumulative Preferred Shares (“Series B Preferred Stock”)
	At December 31, 2014 and December 31, 2013, we had 5,650 shares of Series B Preferred Stock issued and outstanding with a par value of $0.001 per share and a liquidation preference of $25.00 per share, or $141,250 in the aggregate. Shares designated as Series B Preferred Stock but unissued totaled 560 at December 31, 2014. At December 31, 2014 and December 31, 2013, there were no accrued or unpaid dividends on the Series B Preferred Stock. The Series B Preferred Stock is entitled to a dividend at a rate of 7.875% per year based on the $25.00 per share liquidation preference before the common stock is entitled to receive any dividends. The Series B Preferred Stock is redeemable at $25.00 per share plus accrued and unpaid dividends exclusively at our option commencing on February 12, 2018 (subject to our right under limited circumstances to redeem the Series A Preferred Stock earlier in order to preserve our qualification as a REIT). The Series B Preferred Stock is senior to our common stock and rank on parity with the Series A Preferred Stock. In the event of liquidation, dissolution or winding up, the Series B Preferred Stock will receive a liquidation preference of $25.00 per share plus accumulated and unpaid dividends before distributions are paid to holders of our common stock, with no right or claim to any of our remaining assets thereafter. The Series B Preferred Stock generally does not have voting rights, except if we fail to pay dividends on the Series B Preferred Stock for eighteen months, whether or not consecutive. Under such circumstances, the Series B Preferred Stock will be entitled to vote to elect two additional directors to the Board, until all unpaid dividends have been paid or declared and set aside for payment. The Series B Preferred Stock has no stated maturity, is not subject to any sinking fund or mandatory redemption and will remain outstanding indefinitely unless repurchased or redeemed by us or converted into our common stock in connection with a change of control by the holders of Series B Preferred Stock.
	Common Stock
	Common Stock
	At December 31, 2014, we were authorized to issue up to 1,000,000 shares of common stock, par value $0.001 per share, with such designations, voting and other rights and preferences as may be determined from time to time by our Board. We had 353,159 shares of common stock issued and outstanding at December 31, 2014 and 357,613 shares of common stock issued and outstanding at December 31, 2013.
	Common Stock Repurchased
	On March 5, 2014, our Board increased the authorization under our common stock repurchase program (the "Repurchase Program") to 50,000 shares of our common stock outstanding. Under the Repurchase Program, shares may be purchased in the open market, including block trades, through privately negotiated transactions, or pursuant to a trading plan separately adopted in the future. The timing, manner, price and amount of any repurchases will be at our discretion, subject to the requirements of the Securities Exchange Act of 1934, as amended, and related rules. We are not required to repurchase any shares under the Repurchase Program and it may be modified, suspended or terminated at any time for any reason. We do not intend to purchase shares from our Board or other affiliates. Under Maryland law, such repurchased shares are treated as authorized but unissued. For the year ended December 31, 2014, we repurchased 4,804 shares of our common stock under the Repurchase Program for an aggregate cost of $18,362. At December 31, 2014, there were 45,196 remaining shares authorized for repurchase under our Repurchase Program.
	Revenue Recognition
	Interest income is earned and recognized on Agency Securities based on their unpaid principal amounts and their contractual terms. Premiums and discounts associated with the purchase of Multi-Family MBS, which are generally not subject to prepayment, are amortized or accreted into interest income over the contractual lives of the securities using a level yield method. Premiums and discounts associated with the purchase of other Agency Securities are amortized or accreted into interest income over the actual lives of the securities, reflecting actual prepayments as they occur.
	Fair Value of Agency Securities: We invest in Agency Securities representing interests in or obligations backed by pools of fixed rate, hybrid adjustable rate and adjustable rate mortgage loans. The authoritative literature requires us to classify our investments as either trading, available for sale or held to maturity securities. Management determines the appropriate classifications of the securities at the time they are acquired and evaluates the appropriateness of such classifications at each balance sheet date. We currently classify all of our Agency Securities as available for sale. Agency Securities classified as available for sale are reported at their estimated fair values with unrealized gains and losses excluded from earnings and reported as part of the statements of comprehensive income (loss).
	Security purchase and sale transactions, including purchase of "when issued" securities, are recorded on the trade date. Gains or losses realized from the sale of securities are included in income and are determined using the specific identification method.
	Impairment of Assets: We evaluate Agency Securities for other than temporary impairment at least on a quarterly basis and more frequently when economic or market concerns warrant such evaluation. We consider an impairment to be other than temporary if we (1) have the intent to sell the Agency Securities, (2) believe it is more likely than not that we will be required to sell the securities before recovery (for example, because of liquidity requirements or contractual obligations) or (3) a credit loss exists. Impairment losses recognized establish a new cost basis for the related Agency Securities.
	Comprehensive Income (Loss)
	Comprehensive income (loss) refers to changes in equity during a period from transactions and other events and circumstances from non-owner sources. It includes all changes in equity during a period, except those resulting from investments by owners and distributions to owners.
	Reclassification
	Interest expense amounts on U.S. Treasury Securities sold short have been presented separately in the December 31, 2013 consolidated statements of operations to conform to the current presentation. Gain (loss) on short sale of U.S. Treasury Securities have been adjusted for this change in the consolidated statements of operations and the consolidated statements of cash flows to conform to current presentation. No other reclassifications have been made to previously reported amounts.

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	12 Months Ended
	Dec. 31, 2014
Accounting Changes and Error Corrections [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements
	In June 2014, the Financial Accounting Standards Board issued ASU 2014-11, Repurchase-to Maturity Transactions, Repurchase Financing, and Disclosures, Transfers and Servicing (Topic 860). We do not have repurchase-to-maturity transactions or repurchase financing arrangements of the type covered by ASU 2014-11, therefore this change will not affect our consolidated balance sheets or consolidated statements of operations. The amendment also requires certain additional disclosures about repurchase agreements beginning with our second quarter 2015 consolidated financial statements.

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments
	Our valuation techniques for financial instruments are based on observable and unobservable inputs. Observable inputs reflect readily obtainable data from third party sources, while unobservable inputs reflect management’s market assumptions. The Accounting Standards Codification Topic No. 820, “Fair Value Measurement,” classifies these inputs into the following hierarchy:
	Level 1 Inputs - Quoted prices for identical instruments in active markets.
	Level 2 Inputs - Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations whose inputs are observable or whose significant value drivers are observable.
	Level 3 Inputs - Prices determined using significant unobservable inputs. Unobservable inputs may be used in situations where quoted prices or observable inputs are unavailable (for example, when there is little or no market activity for an investment at the end of the period). Unobservable inputs reflect management’s assumptions about the factors that market participants would use in pricing an asset or liability, and would be based on the best information available.
	The following describes the valuation methodologies used for our assets and liabilities measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy. Any transfers between levels are assumed to occur at the beginning of the reporting period.
	Cash - Cash includes cash on deposit with financial institutions. The carrying amount of cash is deemed to be its fair value. Our cash balances are classified as Level 1. Cash balances posted by us to counterparties or posted by counterparties to us as collateral are classified as Level 2 because they are integrally related to the Company's repurchase financing and interest rate swap agreements, which are classified as Level 2.
	Agency Securities, Available for Sale - Fair value for the Agency Securities in our securities portfolio is based on obtaining a valuation for each Agency Security from third party pricing services and/or dealer quotes. The third party pricing services use common market pricing methods that may include pricing models that may incorporate such factors as coupons, prepayment speeds, spread to the Treasury curves and interest rate swap curves, duration, periodic and life caps and credit enhancement. If the fair value of an Agency Security is not available from the third party pricing services or such data appears unreliable, we obtain quotes from up to three dealers who make markets in similar Agency Securities. In general, the dealers incorporate common market pricing methods, including a spread measurement to the Treasury curve or interest rate swap curve as well as underlying characteristics of the particular Agency Security including coupon, periodic and life caps, collateral type, rate reset period and seasoning or age of the Agency Security. Management reviews pricing used to ensure that current market conditions are properly reflected. This review includes, but is not limited to, comparisons of similar market transactions or alternative third party pricing services, dealer quotes and comparisons to a third party pricing model. Fair values obtained from the third party pricing services for similar instruments are classified as Level 2 securities if the inputs to the pricing models used are consistent with the Level 2 definition. If quoted prices for a security are not reasonably available from the third party pricing service, but dealer quotes are, the security will be classified as a Level 2 security. If neither is available, management will determine the fair value based on characteristics of the security that we receive from the issuer and based on available market information received from dealers and classify it as a Level 3 security. At December 31, 2014 and December 31, 2013, all of our Agency Security fair values are classified as Level 2 based on the inputs used by our third party pricing services and dealer quotes.
	Receivables and Payables for Unsettled Sales and Purchases - The carrying amount is generally deemed to be fair value because of the relatively short time to settlement. Such receivables and payables are classified as Level 2 because they are effectively secured by the related securities and could potentially be subject to counterparty credit considerations.
	Repurchase Agreements - The fair value of repurchase agreements reflects the present value of the contractual cash flows discounted at the estimated LIBOR based market interest rates at the valuation date for repurchase agreements with a term equivalent to the remaining term to interest rate repricing, which may be at maturity, of our repurchase agreements. The fair value of the repurchase agreements approximates their carrying amount due to the short-term nature of these financial instruments. Our repurchase agreements are classified as Level 2.
	Derivative Transactions - Our Futures Contracts are traded on the Chicago Mercantile Exchange (“CME”) and are classified as Level 1. The fair values of our interest rate swap contracts and interest rate swaptions are valued using information provided by third party pricing services that incorporate common market pricing methods that may include current interest rate curves, forward interest rate curves and market spreads to interest rate curves. Management compares pricing information received to dealer quotes to ensure that the current market conditions are properly reflected. The fair values of our interest rate swap contracts and our interest rate swaptions are classified as Level 2.
	The following tables provide a summary of our assets and liabilities that are measured at fair value on a recurring basis at December 31, 2014 and December 31, 2013.
		Quoted Prices		Significant		Significant		Balance at December 31, 2014
		in Active		Observable		Unobservable
		Markets for		Inputs		Inputs
		Identical Assets		(Level 2)		(Level 3)
		(Level 1)
	Assets at Fair Value:
	Agency Securities, available for sale	$	—	$	15,297,529	$	—	$	15,297,529
	Derivatives	$	—	$	60,518	$	—	$	60,518
	Liabilities at Fair Value:
	Derivatives	$	180	$	137,213	$	—	$	137,393
	There were no transfers of assets or liabilities between the levels of the fair value hierarchy during the year ended December 31, 2014.
		Quoted Prices		Significant		Significant		Balance at December 31, 2013
		in Active		Observable		Unobservable
		Markets for		Inputs		Inputs
		Identical Assets		(Level 2)		(Level 3)
		(Level 1)
	Assets at Fair Value:
	Agency Securities, available for sale	$	—	$	14,648,178	$	—	$	14,648,178
	Derivatives	$	—	$	508,988	$	—	$	508,988
	Liabilities at Fair Value:
	Derivatives	$	1,503	$	101,292	$	—	$	102,795
	There were no transfers of assets or liabilities between the levels of the fair value hierarchy during the year ended December 31, 2013.
	The following tables provide a summary of the carrying values and fair values of our financial assets and liabilities not carried at fair value but for which fair value is required to be disclosed at December 31, 2014 and December 31, 2013.
	31-Dec-14					Fair Value Measurements using:
		Carrying Value		Fair		Quoted Prices		Significant		Significant
				Value		in Active		Observable		Unobservable
						Markets for		Inputs		Inputs
						Identical Assets		(Level 2)		(Level 3)
						(Level 1)
	Financial Assets:
	Cash	$	494,561	$	494,561	$	494,561	$	—	$	—
	Cash collateral posted to counterparties	$	129,004	$	129,004	$	—	$	129,004	$	—
	Receivable for unsettled sales	$	260,598	$	260,598	$	—	$	260,598	$	—
	Principal payments receivable	$	93	$	93	$	—	$	93	$	—
	Accrued interest receivable	$	41,915	$	41,915	$	—	$	41,915	$	—
	Financial Liabilities:
	Repurchase agreements	$	13,881,921	$	13,881,921	$	—	$	13,881,921	$	—
	Cash collateral posted by counterparties	$	48,240	$	48,240	$	—	$	48,240	$	—
	Payable for unsettled purchases	$	445,292	$	445,292	$	—	$	445,292	$	—
	Accrued interest payable- repurchase agreements	$	7,012	$	7,012	$	—	$	7,012	$	—
	31-Dec-13					Fair Value Measurements using:
		Carrying Value		Fair		Quoted Prices		Significant		Significant
				Value		in Active		Observable		Unobservable
						Markets for		Inputs		Inputs
						Identical Assets		(Level 2)		(Level 3)
						(Level 1)
	Financial Assets:
	Cash	$	496,478	$	496,478	$	496,478	$	—	$	—
	Cash collateral posted to counterparties	$	35,917	$	35,917	$	—	$	35,917	$	—
	Principal payments receivable	$	70	$	70	$	—	$	70	$	—
	Accrued interest receivable	$	42,034	$	42,034	$	—	$	42,034	$	—
	Financial Liabilities:
Repurchase agreements	$	13,151,504	$	13,151,504	$	—	$	13,151,504	$	—
Cash collateral posted by counterparties	$	387,845	$	387,845	$	—	$	387,845	$	—
Payable for unsettled purchases	$	159,159	$	159,159	$	—	$	159,159	$	—
Accrued interest payable- repurchase agreements	$	6,629	$	6,629	$	—	$	6,629	$	—

Agency_Securities_Available_fo

Agency Securities, Available for Sale	12 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Agency Securities, Available for Sale	Agency Securities, Available for Sale
	All of our Agency Securities are classified as available for sale and, as such, are reported at their estimated fair value and changes in fair value reported as part of the statements of comprehensive income (loss). At December 31, 2014 and December 31, 2013, investments in Agency Securities accounted for 100% of our securities portfolio.
	We evaluated our Agency Securities with unrealized losses at December 31, 2014, December 31, 2013 and December 31, 2012, to determine whether there was an other than temporary impairment. The decline in value of our Agency Securities in 2013 was solely due to market conditions and not the credit quality of the assets. All of our Agency Securities are issued and guaranteed by GSEs or Ginnie Mae. The GSEs have a long term credit rating of AA+. At December 31, 2014, December 31, 2013 and December 31, 2012, we also considered whether we intended to sell Agency Securities and whether it was more likely than not that we could meet our liquidity requirements and contractual obligations without selling Agency Securities. There was no other than temporary impairment recognized for the years ended December 31, 2014 and December 31, 2012. At December 31, 2013, anticipating portfolio repositioning sales in the first quarter of 2014, we concluded that the December 31, 2013 unrealized losses on our 25-year and 30-year fixed rate Agency Securities represented an other than temporary impairment. Accordingly, at December 31, 2013, we recognized losses totaling $401,541 in our 2013 consolidated statements of operations, thereby establishing a new cost basis for those Agency Securities with aggregate fair value of $6,800,000 at December 31, 2013. We also determined that at December 31, 2013, there was no other than temporary impairment of our other Agency Securities, which are primarily 20-year and 15-year fixed rate securities.
	At December 31, 2014, we had the following Agency Securities in an unrealized gain or loss position as presented below. The components of the carrying value of our Agency Securities at December 31, 2014 are also presented below. Our Agency Securities had a weighted average coupon of 3.47% at December 31, 2014.
	December 31, 2014	Amortized Cost		Gross Unrealized Loss			Gross Unrealized Gain		Fair Value				Percent of Total
	Fannie Mae
	ARMs & Hybrids	$	40,410	$	(119	)	$	729	$	41,020			0.27	%
	Multi-Family MBS	1,239,227		—			22,676		1,261,903				8.25
	10 Year Fixed	5,336		(3		)	201		5,534				0.04
	15 Year Fixed	7,394,694		(539		)	54,041		7,448,196				48.69
	20 Year Fixed	3,050,676		(13,867		)	16,756		3,053,565				19.96
	25 Year Fixed	21,194		(55		)	—		21,139				0.14
	30 Year Fixed	1,249,696		(227		)	5,765		1,255,234				8.21
	Total Fannie Mae	$	13,001,233	$	(14,810	)	$	100,168	$	13,086,591			85.56	%
	Freddie Mac
	ARMs & Hybrids	14,049		(33		)	246		14,262				0.09
	10 Year Fixed	600		(3		)	8		605				0
	15 Year Fixed	239,438		(315		)	2,499		241,622				1.58
	20 Year Fixed	1,881,496		(12,258		)	8,346		1,877,584				12.27
	Total Freddie Mac	$	2,135,583	$	(12,609	)	$	11,099	$	2,134,073			13.94	%
	Ginnie Mae
	ARMs & Hybrids	75,962		(187		)	665		76,440				0.5
	15 Year Fixed	397		—			28		425				0
	Total Ginnie Mae	$	76,359	$	(187	)	$	693	$	76,865			0.5	%
	Total Agency Securities	$	15,213,175	$	(27,606	)	$	111,960	$	15,297,529			100	%
	Included in the table above are unsettled purchases with an aggregate cost of $445,292 and estimated fair value of $445,527 at December 31, 2014.
	At December 31, 2013, we had the following securities in an unrealized gain or loss position as presented below. The components of the carrying value of our Agency Securities at December 31, 2013 are also presented below. Our Agency Securities had a weighted average coupon of 3.52% at December 31, 2013.
	December 31, 2013	Amortized Cost		Gross Unrealized Loss			Gross Unrealized Gain		Fair Value			Percent of Total
	Fannie Mae
	ARMs&Hybrids	$	55,266	$	(48	)	$	1,174	$	56,392		0.4	%
	10 Year Fixed	1,144		—			25		1,169			0.01
	15 Year Fixed	2,556,986		(20,420		)	2,257		2,538,823			17.33
	20 Year Fixed	2,876,743		(104,357		)	56		2,772,442			18.93
	25 Year Fixed	207,946		—			—		207,946			1.42
	30 Year Fixed	5,230,008		—			—		5,230,008			35.7
	Total Fannie Mae	$	10,928,093	$	(124,825	)	$	3,512	$	10,806,780		73.79	%
	Freddie Mac
	ARMs&Hybrids	17,281		(29		)	428		17,680			0.12
	10 Year Fixed	406		(6		)	2		402			0
	15 Year Fixed	295,357		(3,287		)	1,560		293,630			2
	20 Year Fixed	2,093,482		(69,617		)	694		2,024,559			13.82
	25 Year Fixed	67,436		—			—		67,436			0.46
	30 Year Fixed	1,290,623		—			—		1,290,623			8.81
	Total Freddie Mac	$	3,764,585	$	(72,939	)	$	2,684	$	3,694,330		25.21	%
	Ginnie Mae
	ARMs&Hybrids	145,558		(64		)	1,129		146,623			1
	15 Year Fixed	422		—			23		445			0
	Total Ginnie Mae	$	145,980	$	(64	)	$	1,152	$	147,068		1	%
	Total Agency Securities	$	14,838,658	$	(197,828	)	$	7,348	$	14,648,178		100	%
	Included in the table above are unsettled purchases with an aggregate cost of $159,159 and estimated fair value of $158,850 at December 31, 2013.
	Actual maturities of Agency Securities are generally shorter than stated contractual maturities because actual maturities of Agency Securities are affected by the contractual lives of the underlying mortgages, periodic payments of principal and prepayments of principal.
	The following table summarizes the weighted average lives of our Agency Securities at December 31, 2014 and December 31, 2013.
		December 31, 2014					December 31, 2013
	Weighted Average Life of all Agency Securities	Fair Value		Amortized			Fair Value		Amortized
				Cost					Cost
	Less than one year	$	—	$	—		$	2	$	2
	Greater than or equal to one year and less than three years	48,298		47,929			20,289		20,127
	Greater than or equal to three years and less than five years	10,712,331		10,667,135			3,809,418		3,837,530
	Greater than or equal to five years	4,536,900		4,498,111			10,818,469		10,980,999
	Total Agency Securities	$	15,297,529	$	15,213,175		$	14,648,178	$	14,838,658
	We use a third party model to calculate the weighted average lives of our Agency Securities. Weighted average life is calculated based on expectations for estimated prepayments for the underlying mortgage loans of our Agency Securities. These estimated prepayments are based on assumptions such as interest rates, current and future home prices, housing policy and borrower incentives. The weighted average lives of our Agency Securities at December 31, 2014 and December 31, 2013 in the table above are based upon market factors, assumptions, models and estimates from the third party model and also incorporate management’s judgment and experience. The actual weighted average lives of our Agency Securities could be longer or shorter than estimated.
	The following table presents the unrealized losses and estimated fair value of our Agency Securities by length of time that such securities have been in a continuous unrealized loss position at December 31, 2014 and December 31, 2013.
		Unrealized Loss Position For:
		Less than 12 Months					12 Months or More						Total
	Fair Value		Unrealized			Fair Value		Unrealized				Fair Value		Unrealized
			Losses					Losses						Losses
December 31, 2014	$	895,382	$	(2,324	)	$	2,463,523	$	(25,282	)		$	3,358,905	$	(27,606	)
December 31, 2013	$	7,175,317	$	(197,536	)	$	17,737	$	(292	)		$	7,193,054	$	(197,828	)
During the years ended December 31, 2014, December 31, 2013 and December 31, 2012 we sold $10,595,518, $14,965,888 and $4,149,321 of Agency Securities, which resulted in realized gains (losses) of $68,770, $(593,498), and $40,627, respectively. Sales of Agency Securities are done to reposition our securities portfolio and to reach our target level of liquidity.

Repurchase_Agreements_net

Repurchase Agreements, net	12 Months Ended
	Dec. 31, 2014
Disclosure of Repurchase Agreements [Abstract]
Repurchase Agreements	Repurchase Agreements
	The following table represents the contractual repricing regarding our repurchase agreements to finance Agency Security purchases at December 31, 2014 and December 31, 2013.
			31-Dec-14					31-Dec-13
			Repurchase Agreements			Weighted Average Contractual Rate		Repurchase Agreements		Weighted Average Contractual Rate
	Within 30 days		$	3,994,656		0.36	%	$	3,990,434	0.41	%
	31 days to 60 days		5,631,858			0.37	%	7,098,298		0.41	%
	61 days to 90 days		2,348,839			0.39	%	1,226,694		0.44	%
	Greater than 90 days		1,906,568			0.44	%	836,078		0.43	%
	Total or Weighted Average		$	13,881,921		0.38	%	$	13,151,504	0.42	%
	The following table represents the MRAs and other information regarding our repurchase agreements to finance Agency Security purchases at December 31, 2014 and December 31, 2013.
			31-Dec-14		31-Dec-13
	Number of MRAs		40		35
	Number of counterparties with repurchase agreements outstanding		28		27
	Weighted average maturity in days		60		45
	Haircut for repurchase agreements (1)		4.81	%	4.96	%
	-1	The Haircut represents the weighted average margin requirement, or the percentage amount by which the collateral value must exceed the loan amount. Among other things, it is a measure of our unsecured credit risk to our lenders.
	We have 7 repurchase agreement counterparties that individually account for between 5% and 10% of our aggregate borrowings. In total, these counterparties accounted for approximately 48.11% of our repurchase agreement borrowings outstanding at December 31, 2014. At December 31, 2014 we did not have any repurchase counterparties that individually account for 5% or greater of our stockholders' equity.
	During the year ended December 31, 2014, we sold short $2,005,363 of U.S. Treasury Securities which were repurchased at a cost of $2,020,051, resulting in a realized loss of $(14,688). During the year ended December 31, 2013, we sold short $2,783,711 of U.S. Treasury Securities which we repurchased at a cost of $2,768,203, resulting in a realized gain of $15,508. We did not sell short or purchase U.S. Treasury Securities during the year ended December 31, 2012.

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Derivatives
	We enter into derivative transactions to manage our interest rate risk exposure. These transactions include entering into interest rate swap contracts and interest rate swaptions as well as purchasing or selling Futures Contracts. These transactions are designed to lock in funding costs for repurchase agreements associated with our assets in such a way to help assure the realization of net interest margins. Such transactions are based on assumptions about prepayments which, if not realized, will cause transaction results to differ from expectations.
	We have agreements with our swap (including swaption) counterparties that provide for the posting of collateral based on the fair values of our interest rate swap contracts. Through this margin process, either we or our swap counterparty may be required to pledge cash or Agency Securities as collateral. Collateral requirements vary by counterparty and change over time based on the market value, notional amount and remaining term of the contracts. Certain interest rate swap contracts provide for cross collateralization and cross default with repurchase agreements and other contracts with the same counterparty.
	Interest rate swaptions generally provide us the option to enter into an interest rate swap agreement at a certain point of time in the future with a predetermined notional amount, stated term and stated rate of interest in the fixed leg and interest rate index on the floating leg.
	Our Futures Contracts are traded on the CME which requires the use of daily mark-to-market collateral and the CME provides substantial credit support. The collateral requirements of the CME require us to pledge assets under a bi-lateral margin arrangement, including either cash or Agency Securities and these requirements may vary and change over time based on the market value, notional amount and remaining term of the Futures Contracts.  In the event we are unable to meet a margin call under one of our Futures Contracts, the counterparty to such agreement may have the option to terminate or close-out all of the outstanding Futures Contracts with us. In addition, any close-out amount due to the counterparty upon termination of the counterparty’s transactions would be immediately payable by us pursuant to the applicable agreement.
	The following tables present information about interest rate swap contracts, interest rate swaptions and Futures Contracts which are included in derivatives on the accompanying consolidated balance sheets at December 31, 2014 and December 31, 2013.
	December 31, 2014
	Derivative Type		Remaining / Underlying Term		Weighted Average Remaining Swap / Option Term (Months)		Weighted Average Rate			Notional Amount				Asset Fair Value (1)				Liability Fair Value (1)
	Interest rate swap contracts		0-12 Months		5		1.13	%		$	920,000			$	—			$	(9,349	)
	Interest rate swap contracts		13-24 Months		16		1.23	%		2,900,000				—				(54,396		)
	Interest rate swap contracts		25-36 Months		31		0.63	%		350,000				2,083				—
	Interest rate swap contracts		37-48 Months		37		1	%		300,000				2,090				—
	Interest rate swap contracts		49-60 Months		59		1.56	%		2,000,000				—				(7,414		)
	Interest rate swap contracts		61-72 Months		61		1.48	%		300,000				2,921				—
	Interest rate swap contracts		73-84 Months		0		0	%		—				—				—
	Interest rate swap contracts		85-96 Months		91		1.47	%		2,450,000				50,650				—
	Interest rate swap contracts		97-108 Months		98		2.08	%		2,800,000				2,774				(7,534		)
	Interest rate swap contracts		109-120 Months		0		0	%		—				—				—
	Interest rate swap contracts		121-132 Months		120		2.66	%		1,000,000				—				(58,520		)
	Futures Contracts		0-15 Months		9		2.11	%		10,000				—				(180		)
	Total or Weighted Average				63		1.6	%		$	13,030,000			$	60,518			$	(137,393	)
	-1	See Note 5, “Fair Value of Financial Instruments” for additional discussion.
	December 31, 2013
	Derivative Type		Remaining / Underlying Term		Weighted Average Remaining Swap / Option Term (Months)		Weighted Average Rate			Notional Amount				Asset Fair Value (1)				Liability Fair Value (1)
	Interest rate swap contracts		0-12 Months		2		1.14	%		$	200,000			$	—			$	(2,089	)
	Interest rate swap contracts		13-24 Months		17		1.13	%		920,000				—				(18,095		)
	Interest rate swap contracts		25-36 Months		28		1.23	%		2,900,000				—				(81,108		)
	Interest rate swap contracts		37-48 Months		43		0.63	%		350,000				2,614				—
	Interest rate swap contracts		49-60 Months		49		1	%		300,000				3,817				—
	Interest rate swap contracts		61-72 Months		0		0	%		—				—				—
	Interest rate swap contracts		73-84 Months		73		1.48	%		300,000				11,112				—
	Interest rate swap contracts		85-96 Months		0		0	%		—				—				—
	Interest rate swap contracts		97-108 Months		103		1.47	%		2,450,000				195,221				—
	Interest rate swap contracts		109-120 Months		110		2.08	%		2,800,000				184,456				—
	Futures Contracts		0-21 Months		13		1.97	%		55,000				—				(1,503		)
	Interest rate swaptions		60 Months		9		2.73	%		4,000,000				35,937				—
	Interest rate swaptions		120 Months		6		3.16	%		1,750,000				75,831				—
	Total or Weighted Average				47		1.98	%		$	16,025,000			$	508,988			$	(102,795	)
	-1	See Note 5, “Fair Value of Financial Instruments” for additional discussion.
	We have netting arrangements in place with all derivative counterparties pursuant to standard documentation developed by the International Swap and Derivatives Association. We are also required to post or hold cash collateral based upon the net underlying market value of our open positions with the counterparty.
	The following tables present information about interest rate swap contracts, interest rate swaptions and Futures Contracts and the potential effects of netting if we were to offset the assets and liabilities of these financial instruments on the accompanying consolidated balance sheets. Currently, we present these financial instruments at their gross amounts and they are included in derivatives, at fair value on the accompanying consolidated balance sheet at December 31, 2014.
	31-Dec-14						Gross Amounts Not Offset in the Consolidated Balance Sheet
	Assets		Gross and Net Amounts of Assets Presented in the Consolidated Balance Sheet				Financial				Cash Collateral				Net Amount
							Instruments
	Interest rate swap contracts		$	60,518			$	(137,213	)		$	119,561			$	42,866
	Totals		$	60,518			$	(137,213	)		$	119,561			$	42,866
	31-Dec-14						Gross Amounts Not Offset in the Consolidated Balance Sheet
	Liabilities		Gross and Net Amounts of Liabilities Presented in the Consolidated Balance Sheet				Financial				Cash Collateral				Net Amount
							Instruments
	Interest rate swap contracts		$	(137,213	)		$	137,213			$	—			$	—
	Futures Contracts		(180		)		—				227				47
	Totals		$	(137,393	)		$	137,213			$	227			$	47
	The following tables present information about interest rate swap contracts, interest rate swaptions and Futures Contracts and the potential effects of netting if we were to offset the assets and liabilities of these financial instruments on the accompanying consolidated balance sheets. Currently, we present these financial instruments at their gross amounts and they are included in derivatives, at fair value on the accompanying consolidated balance sheet at December 31, 2013.
	31-Dec-13						Gross Amounts Not Offset in the Consolidated Balance Sheet
	Assets		Gross and Net Amounts of Assets Presented in the Consolidated				Financial				Cash Collateral				Net Amount
			Balance Sheet				Instruments
	Interest rate swap contracts		$	397,219			$	(101,292	)		$	(313,229	)		$	(17,302	)
	Interest rate swaptions		111,769				—				—				111,769
	Totals		$	508,988			$	(101,292	)		$	(313,229	)		$	94,467
	31-Dec-13						Gross Amounts Not Offset in the Consolidated Balance Sheet
	Liabilities		Gross and Net Amounts of Liabilities Presented in the Consolidated Balance Sheet				Financial				Cash Collateral				Net Amount
							Instruments
	Interest rate swap contracts		$	(101,292	)		$	101,292			$	—			$	—
	Futures Contracts		(1,503		)		—				1,599				96
Totals		$	(102,795	)		$	101,292			$	1,599			$	96
The following table represents the location and information regarding our derivatives which are included in Other Income (Loss) in the accompanying consolidated statements of operations for the years ended December 31, 2014, December 31, 2013 and December 31, 2012.
				Income (Loss) Recognized
				For the Year Ended
Derivatives		Location on consolidated statements of operations		December 31, 2014				December 31, 2013				December 31, 2012
Interest rate swap contracts:
Realized gain		Realized loss on derivatives		$	—			$	25,686			$	—
Interest income		Realized loss on derivatives		14,213				17,180				8,882
Interest expense		Realized loss on derivatives		(154,874		)		(158,465		)		(69,479		)
Changes in fair value		Unrealized gain (loss) on derivatives		(371,266		)		499,193				(39,278		)
				$	(511,927	)		$	383,594			$	(99,875	)
Interest rate swaptions:
Realized gain		Realized loss on derivatives		23,318				(17,778		)		—
Changes in fair value		Unrealized gain (loss) on derivatives		(92,687		)		43,034				(20,869		)
				$	(69,369	)		$	25,256			$	(20,869	)
Futures Contracts:
Realized loss		Realized loss on derivatives		(1,373		)		(2,531		)		(2,442		)
Changes in fair value		Unrealized gain (loss) on derivatives		1,323				2,416				1,373
				$	(50	)		$	(115	)		$	(1,069	)
Totals				$	(581,346	)		$	408,735			$	(121,813	)

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies
	Management Agreement with ACM
	We are externally managed by ACM pursuant to a management agreement (the “Management Agreement”) see also Note 14, "Related Party Transactions". The Management Agreement entitles ACM to receive a management fee payable monthly in arrears. Currently, the monthly management fee is 1/12th  of the sum of (a) 1.5% of gross equity raised up to $1.0 billion plus (b) 0.75% of gross equity raised in excess of $1.0 billion. The cost of repurchased stock and any dividend representing a return of capital for tax purposes will reduce the amount of gross equity raised used to calculate the monthly management fee. At December 31, 2014, the effective management fee was 1.03% based on gross equity raised of $2,697,223. The ACM monthly management fee is not calculated based on the performance of our assets. Accordingly, the payment of our monthly management fee may not decline in the event of a decline in our earnings and may cause us to incur losses. We are also responsible for any costs and expenses that ACM incurred solely on behalf of ARMOUR other than the various overhead expenses specified in the terms of the Management Agreement. ACM is further entitled to receive a termination fee from us under certain circumstances.
	Indemnifications and Litigation
	We enter into certain contracts that contain a variety of indemnifications, principally with ACM and underwriters, against third party claims for errors and omissions in connection with their services to us. We have not incurred any costs to defend lawsuits or settle claims related to these indemnification agreements. As a result, the estimated fair value of these agreements, as well as the maximum amount attributable to past events, is not material. Accordingly, we have no liabilities recorded for these agreements at December 31, 2014 and December 31, 2013.
	We are not party to any pending, threatened or contemplated litigation.

Stock_Based_Compensation

Stock Based Compensation	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Based Compensation	Stock Based Compensation
	We adopted the 2009 Stock Incentive Plan (the “Plan”) to attract, retain and reward directors and other persons who provide services to us in the course of operations. The Plan authorizes the Board to grant awards including common stock, restricted shares of common stock, stock options, performance shares, performance units, stock appreciation rights and other equity and cash-based awards (collectively “Awards”), subject to terms as provided in the Plan.
	On May 8, 2014, our stockholders approved an amendment to the Plan to increase the number of shares issuable thereunder from 2,000 to 15,000 shares and the Plan was amended accordingly. Approximately 150 shares awarded in 2013 were awarded subject to stockholder approval of an increase in the number of shares issuable under the Plan. Accordingly, those 150 shares are shown below as awarded during the year ended December 31, 2014.
	Transactions related to awards for the year ended December 31, 2014 are summarized below:
		December 31, 2014
		Number of		Weighted
		Awards		Average Grant
				Date Fair Value
				per Award
	Unvested Awards Outstanding beginning of period	1,329		$	6.94
	Awards issued upon stockholders' approval of Plan amendment	150		$	3.74
	Vested	(424	)	$	7.07
	Unvested Awards Outstanding end of period	1,055		$	6.47
	At December 31, 2014, there was approximately $3,883 of unvested stock based compensation related to the Awards (based on the December 31, 2014 stock price of $3.68 per share), that we expect to recognize as an expense over the remaining average service period of 1.8 years.

Shareholders_Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity
	Dividends
	The following tables present our common stock dividend transactions for the years ended December 31, 2014, December 31, 2013 and December 31, 2012.
	December 31, 2014
	Record Date		Payment Date	Rate per common share			Aggregate
							amount paid to
							holders of record
	15-Jan-14		30-Jan-14	$	0.05		$	17,954
	14-Feb-14		27-Feb-14	$	0.05		17,954
	17-Mar-14		28-Mar-14	$	0.05		17,945
	15-Apr-14		29-Apr-14	$	0.05		17,925
	15-May-14		29-May-14	$	0.05		17,924
	16-Jun-14		27-Jun-14	$	0.05		17,924
	15-Jul-14		30-Jul-14	$	0.05		17,923
	15-Aug-14		29-Aug-14	$	0.05		17,923
	15-Sep-14		29-Sep-14	$	0.05		17,923
	15-Oct-14		30-Oct-14	$	0.05		17,923
	17-Nov-14		26-Nov-14	$	0.05		17,923
	15-Dec-14		30-Dec-14	$	0.05		17,922
	Total dividends paid						$	215,163
	December 31, 2013
	Record Date		Payment Date	Rate per common share			Aggregate amount paid to holders of record
	January 15,  2013		30-Jan-13	$	0.08		$	24,772
	15-Feb-13		27-Feb-13	$	0.08		24,773
	15-Mar-13		27-Mar-13	$	0.08		30,284
	15-Apr-13		29-Apr-13	$	0.07		26,313
	15-May-13		30-May-13	$	0.07		26,313
	14-Jun-13		27-Jun-13	$	0.07		26,088
	15-Jul-13		30-Jul-13	$	0.07		26,074
	15-Aug-13		29-Aug-13	$	0.07		26,074
	16-Sep-13		27-Sep-13	$	0.07		26,079
	15-Oct-13		28-Oct-13	$	0.05		18,624
	15-Nov-13		27-Nov-13	$	0.05		18,624
	16-Dec-13		27-Dec-13	$	0.05		18,574
	Total dividends paid						$	292,592
	December 31, 2012
	Record Date		Payment Date	Rate per common share			Aggregate amount paid to holders of record
	January 15,  2012		30-Jan-12	$	0.11		$	11,659
	15-Feb-12		28-Feb-12	$	0.11		15,329
	15-Mar-12		29-Mar-12	$	0.11		19,768
	16-Apr-12		27-Apr-12	$	0.1		17,840
	15-May-12		30-May-12	$	0.1		18,105
	15-Jun-12		28-Jun-12	$	0.1		18,667
	16-Jul-12		30-Jul-12	$	0.1		23,498
	15-Aug-12		30-Aug-12	$	0.1		29,958
	14-Sep-12		27-Sep-12	$	0.1		30,973
	15-Oct-12		30-Oct-12	$	0.09		27,868
	15-Nov-12		29-Nov-12	$	0.09		27,869
	14-Dec-12		28-Dec-12	$	0.09		27,969
	Total dividends paid						$	269,503
	The following tables present our Series A Preferred Stock dividend transactions for the years ended December 31, 2014, December 31, 2013 and December 31, 2012.
	December 31, 2014
	Record Date		Payment Date	Rate per			Aggregate
				Series A			amount paid to
				Preferred			holders of record
				Share
	15-Jan-14		27-Jan-14	$	0.17		$	374.8
	15-Feb-14		27-Feb-14	$	0.17		374.8
	15-Mar-14		27-Mar-14	$	0.17		374.8
	15-Apr-14		28-Apr-14	$	0.17		374.8
	15-May-14		27-May-14	$	0.17		374.8
	15-Jun-14		27-Jun-14	$	0.17		374.8
	15-Jul-14		28-Jul-14	$	0.17		374.8
	15-Aug-14		27-Aug-14	$	0.17		374.8
15-Sep-14		29-Sep-14	$	0.17		374.8
15-Oct-14		27-Oct-14	$	0.17		374.8
15-Nov-14		28-Nov-14	$	0.17		374.8
15-Dec-14		29-Dec-14	$	0.17		374.8
Total dividends paid						$	4,497.60
December 31, 2013
Record Date		Payment Date	Rate per Series A Preferred share			Aggregate amount paid to holders of record
January 15,  2013		28-Jan-13	$	0.17		$	357.6
15-Feb-13		26-Feb-13	$	0.17		374.8
15-Mar-13		26-Mar-13	$	0.17		374.8
15-Apr-13		29-Apr-13	$	0.17		374.8
15-May-13		27-May-13	$	0.17		374.8
14-Jun-13		27-Jun-13	$	0.17		374.8
15-Jul-13		29-Jul-13	$	0.17		374.8
15-Aug-13		27-Aug-13	$	0.17		374.8
15-Sep-13		27-Sep-13	$	0.17		374.8
15-Oct-13		28-Oct-13	$	0.17		374.8
15-Nov-13		27-Nov-13	$	0.17		374.8
15-Dec-13		27-Dec-13	$	0.17		374.8
Total dividends paid						$	4,480.40
December 31, 2012
Record Date		Payment Date	Rate per Series A Preferred share			Aggregate amount paid to holders of record
July 13, 2012 (1)		27-Jul-12	$	0.29		$	401
15-Aug-12		27-Aug-12	$	0.17		272
14-Sep-12		27-Sep-12	$	0.17		292
15-Oct-12		29-Oct-12	$	0.17		315
15-Nov-12		27-Nov-12	$	0.17		339
14-Dec-12		27-Dec-12	$	0.17		344.6
Total dividends paid						$	1,963.60
(1)This amount included $160 paid to holders of record on July 13, 2012 for the period of June 7, 2012 through June 30, 2012.
The following tables present our Series B Preferred Stock dividend transactions for the years ended December 31, 2014 and December 31, 2013. There were no Series B Preferred Stock dividend transactions for the year ended December 31, 2012.
December 31, 2014
Record Date		Payment Date	Rate per			Aggregate
			Series B			amount paid to
			Preferred			holders of record
			Share
15-Jan-14		27-Jan-14	$	0.16		$	926.9
15-Feb-14		27-Feb-14	$	0.16		$	926.9
15-Mar-14		27-Mar-14	$	0.16		$	926.9
15-Apr-14		28-Apr-14	$	0.16		$	926.9
15-May-14		27-May-14	$	0.16		$	926.9
15-Jun-14		27-Jun-14	$	0.16		$	926.9
15-Jul-14		28-Jul-14	$	0.16		$	926.9
15-Aug-14		27-Aug-14	$	0.16		$	926.9
15-Sep-14		29-Sep-14	$	0.16		$	926.9
15-Oct-14		27-Oct-14	$	0.16		$	926.9
15-Nov-14		28-Nov-14	$	0.16		$	926.9
15-Dec-14		29-Dec-14	$	0.16		$	926.9
Total dividends paid						$	11,122.80
December 31, 2013
Record Date		Payment Date	Rate per Series B Preferred share			Aggregate amount paid to holders of record
15-Mar-13		27-Mar-13	$	0.25		$	1,391.00
15-Apr-13		29-Apr-13	$	0.16		926.9
15-May-13		27-May-13	$	0.16		926.9
14-Jun-13		27-Jun-13	$	0.16		926.9
15-Jul-13		29-Jul-13	$	0.16		926.9
15-Aug-13		27-Aug-13	$	0.16		926.9
15-Sep-13		27-Sep-13	$	0.16		926.9
15-Oct-13		28-Oct-13	$	0.16		926.9
15-Nov-13		27-Nov-13	$	0.16		926.9
15-Dec-13		27-Dec-13	$	0.16		926.9
Total dividends paid						$	9,733.10
Equity Capital Raising Activities
The following tables present our equity transactions for the years ended December 31, 2014, December 31, 2013 and December 31, 2012.
December 31, 2014
Transaction Type		Completion Date	Number of		Per Share			Net Proceeds
			Shares		price (1)
Common stock dividend reinvestment program		January 27, 2014 through December 30, 2014	66		$	4.12		$	269
-1	Weighted average price
December 31, 2013
Transaction Type		Completion Date	Number of		Per Share price (1)			Net Proceeds
			Shares
Series A Preferred equity distribution agreements		January 2, 2013 to January 30, 2013	175		$	25.51		$	4,380
Common stock dividend reinvestment program		January 25, 2013 to December 27, 2013	67		$	4.83		$	—
Series B Preferred initial offering		20-Feb-13	5,650		$	25		$	136,553
Common stock follow-on public offering		20-Feb-13	65,000		$	6.75		$	438,582
(1)  Weighted average price
December 31, 2012
Transaction Type		Completion Date	Number of		Per Share price (1)			Net Proceeds
			Shares
Follow-on public offering		13-Jan-12	10,350		$	6.8		$	70,179
Follow-on public offering		8-Feb-12	29,900		$	6.8		$	203,033
Equity distribution agreement		29-Feb-12	1,287		$	7.06		$	8,902
Follow-on public offering		14-Mar-12	35,650		$	6.72		$	239,168
Issuance of Series A Preferred Stock		7-Jun-12	1,400		$	25		$	33,780
Follow-on public offering		13-Jul-12	46,000		$	7.06		$	324,474
Follow-on public offering		8-Aug-12	63,250		$	7.3		$	461,435
Common equity distribution agreements		January 18, 2012 to September 11, 2012	19,750		$	7.14		$	138,159
Preferred equity distribution agreements		July 16, 2012 to December 27, 2012	606		$	25.54		$	15,014
Dividend Reinvestment and Stock Purchase Plan		January 25, 2012 to December 28, 2012	7,286		$	7.28		$	52,888
(1)  Weighted average price
Common Stock Repurchases
The following tables present our common stock repurchases for the year ended December 31, 2014 and December 31, 2013. We did not have any common stock repurchases for the year ended December 31, 2012.
December 31, 2014
Transaction Type		Completion Date	Number of		Per Share price (1)			Net Cost
			Shares
Repurchased common shares		March 12, 2014 through December 31, 2014	4,804		$	3.82		$	18,362
-1	Weighted average price
December 31, 2013
Transaction Type		Completion Date	Number of		Per Share price (1)			Net Cost
			Shares
Repurchased common shares		May 15, 2013 to May 17, 2013	3,396		$	5.94		$	20,259
Repurchased common shares		December 11, 2013 to December 31, 2013	13,375		$	3.89		$	52,435
(1)  Weighted average price

Income_Loss_per_Common_Share

Income (Loss) per Common Share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Income (Loss) per Common Share	Income (Loss) per Common Share
	The following table presents a reconciliation of net income (loss) and the shares used in calculating weighted average basic and diluted earnings per common share for the years ended December 31, 2014, December 31, 2013 and December 31, 2012.
		For the Year Ended
		31-Dec-14			31-Dec-13			December 31, 2012
	Net Income (loss)	$	(179,048	)	$	(187,044	)	$	222,306
	Less: Preferred dividends	(15,620		)	(14,213		)	(1,964		)
	Net income (loss) available (related) to common stockholders	$	(194,668	)	$	(201,257	)	$	220,342
	Weighted average common shares outstanding – basic	357,233			362,830			223,627
	Add: Effect of dilutive non-vested awards, assumed vested	—			—			636
	Weighted average common shares outstanding – diluted	357,233			362,830			224,263

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes
	The following table reconciles our GAAP net income to estimated REIT taxable income for the years ended December 31, 2014, December 31, 2013 and December 31, 2012.
		For the Year Ended
		31-Dec-14			31-Dec-13			December 31, 2012
	GAAP net income (loss)	$	(179,048	)	$	(187,044	)	$	222,306
	Book to tax differences:
	Changes in interest rate contracts	439,312			(551,359		)	58,774
	(Gains) Losses on Security Sales	(54,082		)	579,322			—
	Other than temporary loss on Agency Securities	—			401,541			—
	Amortization of deferred hedging costs	(1,174		)	(2,030		)	—
	Net premium amortization differences	(5,609		)	—			—
	Other	21			18			94
	Estimated taxable income	$	199,420		$	240,448		$	281,174
	Interest rate contracts are treated as hedging transactions for tax purposes. Unrealized gains and losses on open interest rate contracts are not included in the determination of taxable income. Realized gains and losses on interest rate contracts terminated before their maturity are deferred and amortized over the remainder of the original term of the contract.
	Net capital losses realized in 2013 and 2014 totaling $(579,322) and $(341,850) will be available to offset future capital gains realized through 2018 and 2019, respectively.
	The aggregate tax basis of our assets and liabilities was less than our total Stockholders’ Equity at December 31, 2014 by approximately $91,976, or approximately $0.26 per common share (based on the 353,159 common shares then outstanding).
	We are required and intend to timely distribute substantially all of our REIT taxable income in order to maintain our REIT status under the Code. Total dividend payments to stockholders were $230,783, $306,805 and $271,467 for the years ended December 31, 2014, December 31, 2013 and December 31, 2012, respectively. Our estimated REIT taxable income available to pay dividends was $199,420, $240,448 and $281,174 for the year ended December 31, 2014, December 31, 2013 and December 31, 2012, respectively. Realized losses on derivatives for the year ended December 31, 2014 include realized gains on swaptions of $23,318. Realized losses on derivatives for the year ended December 31, 2013 include realized gains on interest rate swap contracts of $25,686. There were no realized gains on interest rate swap contracts or swaptions for the year ended December 31, 2012. These are amortized for tax purposes over the 10 year terms of the referenced interest rate swap/swaption contract. Our taxable REIT income and dividend requirements to maintain our REIT status are determined on an annual basis. Dividends paid in excess of taxable REIT income for the year (including amounts carried forward from prior years) will generally not be taxable to common stockholders.
	Our management is responsible for determining whether tax positions taken by us are more likely than not to be sustained on their merits. We have no material unrecognized tax benefits or material uncertain tax positions.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions
	We are externally managed by ACM pursuant to the Management Agreement. All of our executive officers are also employees of ACM. ACM manages our day-to-day operations, subject to the direction and oversight of the Board. The Management Agreement runs through June 18, 2022 and is thereafter automatically renewed for an additional five-year term unless terminated under certain circumstances. Either party must provide 180 days prior written notice of any such termination.
	Under the terms of the Management Agreement, ACM is responsible for costs incident to the performance of its duties, such as compensation of its employees and various overhead expenses. ACM is responsible for the following primary roles:
	•	Advising us with respect to, arranging for and managing the acquisition, financing, management and disposition of, elements of our investment portfolio;
	•	Evaluating the duration risk and prepayment risk within the investment portfolio and arranging borrowing and hedging strategies;
	•	Coordinating capital raising activities;
	•	Advising us on the formulation and implementation of operating strategies and policies, arranging for the acquisition of assets, monitoring the performance of those assets  and providing administrative and managerial services in connection with our day-to-day operations; and
	•	Providing executive and administrative personnel, office space and other appropriate services required in rendering management services to us.
	In accordance with the Management Agreement, we incurred $27,857, $28,141 and $19,459 in management fees for the year ended December 31, 2014, December 31, 2013 and December 31, 2012.
	We are required to take actions as may be reasonably required to enable ACM to carry out its duties and obligations. We are also responsible for any costs and expenses that ACM incurred solely on our behalf other than the various overhead expenses specified in the terms of the Management Agreement. For the years ended December 31, 2014, December 31, 2013 and December 31, 2012 we reimbursed ACM $2,204, $1,550 and $52, respectively for other expenses incurred on our behalf. In consideration of our 2012 results, in 2013, we also elected to make a restricted stock award to our executive officers and other ACM employees through ACM. The award vests through 2017 and resulted in our recognizing stock based compensation expense of $900 and $1,097 for the years ended December 31, 2014 and December 31, 2013. There was no stock based compensation for the year ended December 31, 2012.
	Pursuant to a Sub-Management Agreement between ARMOUR, ACM and Staton Bell Blank Check LLC (“SBBC”), ACM is responsible for the monthly payment of a sub-management fee to SBBC in an amount equal to 25% of the monthly management fee earned by ACM, net of expenses. In October 2014, SBBC elected to continue to act as sub-managers for ACM. As part of the Company’s founding in 2009, SBBC had the option to relinquish its sub-management agreement in exchange for a lump sum cash payment from us in November 2014. The option formula would have resulted in ARMOUR paying SBBC $33,559 in cash and receiving the ongoing sub-management fee. SBBC allowed the option to expire unexercised. In connection with the conversion, SBBC became substantially wholly owned by ACM, effective January 1, 2015.

Interest_Rate_Risk

Interest Rate Risk	12 Months Ended
	Dec. 31, 2014
Interest Rate Risk [Abstract]
Interest Rate Risk	Interest Rate Risk
	Our primary market risk is interest rate risk. Interest rates are highly sensitive to many factors, including governmental monetary and tax policies, domestic and international economic and political considerations and other factors beyond our control. Changes in the general level of interest rates can affect net interest income, which is the difference between the interest income earned and the interest expense incurred in connection with the liabilities, by affecting the spread between the interest-earning assets and interest-bearing liabilities. Changes in the level of interest rates also can affect the value of Agency Securities and our ability to realize gains from the sale of these assets. A decline in the value of the Agency Securities pledged as collateral for borrowings under repurchase agreements could result in the counterparties demanding additional collateral pledges or liquidation of some of the existing collateral to reduce borrowing levels.

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events
	On January 27, 2015, a cash dividend of $0.17 per outstanding share of Series A Preferred Stock, or $375 in the aggregate, and $0.16 per outstanding share of Series B Preferred Stock, or $927 in the aggregate, was paid to holders of record on January 15, 2015. We have also declared cash dividends of $0.17 and $0.16 per outstanding share of Series A Preferred Stock and Series B Preferred Stock, respectively, payable February 27, 2015 to holders of record on February 15, 2015 and payable March 15, 2015 to holders of record on March 27, 2015.
	On January 27, 2015, a cash dividend of $0.04 per outstanding common share, or $14,126 in the aggregate, was paid to holders of record on January 15, 2015. We have also declared cash dividends of $0.04 per outstanding common share payable February 27, 2015 to holders of record on February 13, 2015 and payable March 27, 2015 to holders of record on March 13, 2015.

Quarterly_Financial_Data_unaud

Quarterly Financial Data (unaudited)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Data (unaudited)	Quarterly Financial Data (unaudited)
	The following tables are a comparative breakdown of our unaudited quarterly financial results for the immediately preceding eight quarters.
		Quarter Ended
		March 31,			June 30,			September 30,			December 31,
		2014			2014			2014			2014
	Interest income, net of premium amortization	$	123,082		$	113,892		$	107,481		$	106,472
	Interest expense- repurchase agreements	(14,747		)	(14,979		)	(15,006		)	(14,830		)
	Interest expense- U.S. Treasury Securities sold short	—			(4,263		)	(160		)	(1,128		)
	Net Interest Income	$	108,335		$	94,650		$	92,315		$	90,514
	Realized gain (loss) on sale of Agency Securities (reclassified from Other comprehensive income (loss))	69,869			11,167			(12,390		)	124
	Gain (loss) on short sale of U.S. Treasury Securities	—			(15,781		)	3,086			(1,993		)
	Realized loss on derivatives (1)	(11,739		)	(34,498		)	(34,655		)	(37,824		)
	Unrealized gain (loss) on derivatives	(176,355		)	(116,273		)	14,708			(184,710		)
	Expenses	(9,888		)	(9,455		)	(8,972		)	(9,283		)
	Income tax benefit (expense)	—			—			—			—
	Net Income (Loss)	$	(19,778	)	$	(70,190	)	$	54,092		$	(143,172	)
	Dividends declared on preferred stock	(3,905		)	(3,905		)	(3,905		)	(3,905		)
	Net Income (Loss) available (related) to common stockholders	$	(23,683	)	$	(74,095	)	$	50,187		$	(147,077	)
	Net income (loss) available (related) per share to common stockholders – Basic	$	(0.07	)	$	(0.21	)	$	0.14		$	(0.41	)
	Net income (loss) available (related) per share to common stockholders – Diluted	$	(0.07	)	$	(0.21	)	$	0.14		$	(0.41	)
	Dividends declared per common share	$	0.15		$	0.15		$	0.15		$	0.15
	Weighted average common shares outstanding – Basic	357,496			357,111			357,196			357,134
	Weighted average common shares outstanding – Diluted	357,496			357,111			358,357			357,134
	(1) Interest expense related to our interest rate swap contracts is recorded in realized loss on derivatives on the consolidated statements of operations
		Quarter Ended
		March 31,			June 30,			September 30,			December 31,
		2013			2013			2013			2013
	Interest income, net of premium amortization	$	130,637		$	141,159		$	112,418		$	121,229
	Interest expense- repurchase agreements	(25,475		)	(23,578		)	(17,811		)	(16,249		)
	Interest expense- U.S. Treasury Securities sold short	—			(17		)	(1,420		)	—
	Net Interest Income	$	105,162		$	117,564		$	93,187		$	104,980
	Realized gain (loss) on sale of Agency Securities (reclassified from Other comprehensive income (loss))	18,514			20,876			(300,960		)	(331,929		)
	Other than temporary impairment of Agency Securities	—			—			—			(401,541		)
	Gain (loss) on short sale of U.S. Treasury Securities	—			(21,078		)	36,587			—
	Realized loss on derivatives (1)	(29,053		)	(38,858		)	(37,262		)	(30,735		)
	Unrealized gain (loss) on derivatives	16,301			412,183			(11,821		)	127,980
	Expenses	(8,634		)	(9,302		)	(9,684		)	(9,531		)
	Income tax benefit	—			—			10			—
	Net Income (Loss)	$	102,290		$	481,385		$	(229,943	)	$	(540,776	)
	Dividends declared on preferred stock	(2,497		)	(3,905		)	(3,905		)	(3,906		)
	Net Income (Loss) available (related) to common stockholders	$	99,793		$	477,480		$	(233,848	)	$	(544,682	)
	Net income (loss) available (related) per share to common stockholders – Basic	$	0.3		$	1.28		$	(0.63	)	$	(1.47	)
	Net income (loss) available (related) per share to common stockholders – Diluted	$	0.29		$	1.28		$	(0.63	)	$	(1.47	)
	Dividends declared per common share	$	0.24		$	0.21		$	0.21		$	0.15
	Weighted average common shares outstanding – Basic	337,935			372,591			370,818			369,543
	Weighted average common shares outstanding – Diluted	339,722			374,135			372,256			369,543
	(1) Interest expense related to our interest rate swap contracts is recorded in realized loss on derivatives on the consolidated statements of operations.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Basis of Presentation	The accompanying consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the U.S. (“GAAP”). The consolidated financial statements include the accounts of ARMOUR Residential REIT, Inc. and its subsidiary. All intercompany accounts and transactions have been eliminated. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Significant estimates affecting the accompanying consolidated financial statements include the valuation of Agency Securities (as defined below) and derivative instruments.
Cash	Cash
	Cash includes cash on deposit with financial institutions. We may maintain deposits in federally insured financial institutions in excess of federally insured limits. However, management believes we are not exposed to significant credit risk due to the financial position and creditworthiness of the depository institutions in which those deposits are held.
Cash Collateral Posted/Held	Cash Collateral Posted To/By Counterparties
	Cash collateral posted to/by counterparties represents cash posted by us to counterparties or posted by counterparties to us as collateral for our interest rate swap contracts (including swaptions), Eurodollar Futures Contracts (“Futures Contracts”) and repurchase agreements on our Agency Securities.
Agency Securities, at Fair Value	Agency Securities, Available For Sale
	We generally intend to hold most of our Agency Securities for extended periods of time. We may, from time to time, sell any of our Agency Securities as part of the overall management of our securities portfolio. Management determines the appropriate classifications of the securities at the time they are acquired and evaluates the appropriateness of such classifications at each balance sheet date. At December 31, 2014 and December 31, 2013, all of our Agency Securities were classified as available for sale securities. Agency Securities classified as available for sale are reported at their estimated fair values with unrealized gains and losses excluded from earnings and reported as part of the consolidated statements of comprehensive income (loss).
Receivables and Payable for Unsettled Sales and Purchases	Receivables and Payables for Unsettled Sales and Purchases
	We account for purchases and sales of securities on the trade date, including purchases and sales for forward settlement. Receivables and payables for unsettled trades represent the agreed trade price times the outstanding balance of the securities at the balance sheet date.
Accrued Interest Receivable and Payable	Accrued Interest Receivable and Payable
	Accrued interest receivable includes interest accrued between payment dates on Agency Securities. Accrued interest payable includes interest payable on our repurchase agreements and may, at certain times, contain interest payable on U.S. Treasury Securities sold short.
Repurchase Agreements	Repurchase Agreements
	We finance the acquisition of our Agency Securities through the use of repurchase agreements. Our repurchase agreements are secured by our Agency Securities and bear interest rates that have historically moved in close relationship to the Federal Funds Rate and the London Interbank Offered Rate (“LIBOR”). Under these repurchase agreements, we sell Agency Securities to a lender and agree to repurchase the same Agency Securities in the future for a price that is higher than the original sales price. The difference between the sales price that we receive and the repurchase price that we pay represents interest paid to the lender. A repurchase agreement operates as a financing arrangement under which we pledge our Agency Securities as collateral to secure a loan which is equal in value to a specified percentage of the estimated fair value of the pledged collateral. We retain beneficial ownership of the pledged collateral.  At the maturity of a repurchase agreement, we are required to repay the loan and concurrently receive back our pledged collateral from the lender or, with the consent of the lender, we may renew such agreement at the then prevailing interest rate. The repurchase agreements may require us to pledge additional assets to the lender in the event the estimated fair value of the existing pledged collateral declines.
	In addition to the repurchase agreement financing discussed above, at certain times we have entered into reverse repurchase agreements with certain of our repurchase agreement counterparties. Under a typical reverse repurchase agreement, we purchase U.S. Treasury Securities from a borrower in exchange for cash and agree to sell the same securities in the future in exchange for a price that is higher than the original purchase price. The difference between the purchase price originally paid and the sale price represents interest received from the borrower. Reverse repurchase agreement receivables and repurchase agreement liabilities are presented net when they meet certain criteria, including being with the same counterparty, being governed by the same master repurchase agreement ("MRA"), settlement through the same brokerage or clearing account and maturing on the same day.
Obligations to Return Securities Received as Collateral, at Fair Value	Obligations to Return Securities Received as Collateral, at Fair Value
	At certain times, we also sell to third parties the U.S. Treasury Securities received as collateral for reverse repurchase agreements and recognize the resulting obligation to return said U.S. Treasury Securities as a liability on our consolidated balance sheets. Interest is recorded on the repurchase agreements, reverse repurchase agreements and U.S. Treasury Securities sold short on an accrual basis and presented as interest expense. Both parties to the transaction have the right to make daily margin calls based on changes in the fair value of the collateral received and/or pledged.
Derivatives, at Fair Value	Derivatives, at Fair Value
	We recognize all derivatives as either assets or liabilities at fair value on our consolidated balance sheets. All changes in the fair values of our derivatives are reflected in our consolidated statements of operations. We designate derivatives as hedges for tax purposes and any unrealized derivative gains or losses would not affect our distributable net taxable income.
Preferred Stock and Common Stock	Preferred Stock
	At December 31, 2014, we were authorized to issue up to 50,000 shares of preferred stock, par value $0.001 per share, with such designations, voting and other rights and preferences as may be determined from time to time by our Board of Directors (“Board”) or a committee thereof. We have designated 9,610 shares as 8.250% Series A Preferred Stock and 6,210 shares as 7.875% Series B Preferred Stock. At December 31, 2014, a total of 34,180 shares of our authorized preferred stock remain available for designation as future series.
	Series A Cumulative Preferred Shares (“Series A Preferred Stock”
	At December 31, 2014 and December 31, 2013, we had 2,181 shares of Series A Preferred Stock issued and outstanding with a par value of $0.001 per share and a liquidation preference of $25.00 per share, or $54,514 in the aggregate. Shares designated as Series A Preferred Stock but unissued totaled 7,429 at December 31, 2014. At December 31, 2014 and December 31, 2013, there were no accrued or unpaid dividends on the Series A Preferred Stock. The Series A Preferred Stock is entitled to a dividend at a rate of 8.250% per year based on the $25.00 per share liquidation preference before the common stock is entitled to receive any dividends. The Series A Preferred Stock is redeemable at $25.00 per share plus accrued and unpaid dividends exclusively at our option commencing on June 7, 2017 (subject to our right under limited circumstances to redeem the Series A Preferred Stock earlier in order to preserve our qualification as a REIT). The Series A Preferred Stock is senior to our common stock and therefore in the event of liquidation, dissolution or winding up, the Series A Preferred Stock will receive a liquidation preference of $25.00 per share plus accumulated and unpaid dividends before distributions are paid to holders of our common stock, with no right or claim to any of our remaining assets thereafter. The Series A Preferred Stock generally does not have voting rights, except if we fail to pay dividends on the Series A Preferred Stock for eighteen months, whether or not consecutive. Under such circumstances, the Series A Preferred Stock will be entitled to vote to elect two additional directors to the Board, until all unpaid dividends have been paid or declared and set aside for payment. The Series A Preferred Stock has no stated maturity, is not subject to any sinking fund or mandatory redemption and will remain outstanding indefinitely unless repurchased or redeemed by us or converted into our common stock in connection with a change of control by the holders of Series A Preferred Stock.
	Series B Cumulative Preferred Shares (“Series B Preferred Stock”)
	At December 31, 2014 and December 31, 2013, we had 5,650 shares of Series B Preferred Stock issued and outstanding with a par value of $0.001 per share and a liquidation preference of $25.00 per share, or $141,250 in the aggregate. Shares designated as Series B Preferred Stock but unissued totaled 560 at December 31, 2014. At December 31, 2014 and December 31, 2013, there were no accrued or unpaid dividends on the Series B Preferred Stock. The Series B Preferred Stock is entitled to a dividend at a rate of 7.875% per year based on the $25.00 per share liquidation preference before the common stock is entitled to receive any dividends. The Series B Preferred Stock is redeemable at $25.00 per share plus accrued and unpaid dividends exclusively at our option commencing on February 12, 2018 (subject to our right under limited circumstances to redeem the Series A Preferred Stock earlier in order to preserve our qualification as a REIT). The Series B Preferred Stock is senior to our common stock and rank on parity with the Series A Preferred Stock. In the event of liquidation, dissolution or winding up, the Series B Preferred Stock will receive a liquidation preference of $25.00 per share plus accumulated and unpaid dividends before distributions are paid to holders of our common stock, with no right or claim to any of our remaining assets thereafter. The Series B Preferred Stock generally does not have voting rights, except if we fail to pay dividends on the Series B Preferred Stock for eighteen months, whether or not consecutive. Under such circumstances, the Series B Preferred Stock will be entitled to vote to elect two additional directors to the Board, until all unpaid dividends have been paid or declared and set aside for payment. The Series B Preferred Stock has no stated maturity, is not subject to any sinking fund or mandatory redemption and will remain outstanding indefinitely unless repurchased or redeemed by us or converted into our common stock in connection with a change of control by the holders of Series B Preferred Stock.
	Common Stock
	Common Stock
	At December 31, 2014, we were authorized to issue up to 1,000,000 shares of common stock, par value $0.001 per share, with such designations, voting and other rights and preferences as may be determined from time to time by our Board. We had 353,159 shares of common stock issued and outstanding at December 31, 2014 and 357,613 shares of common stock issued and outstanding at December 31, 2013.
	Common Stock Repurchased
	On March 5, 2014, our Board increased the authorization under our common stock repurchase program (the "Repurchase Program") to 50,000 shares of our common stock outstanding. Under the Repurchase Program, shares may be purchased in the open market, including block trades, through privately negotiated transactions, or pursuant to a trading plan separately adopted in the future. The timing, manner, price and amount of any repurchases will be at our discretion, subject to the requirements of the Securities Exchange Act of 1934, as amended, and related rules. We are not required to repurchase any shares under the Repurchase Program and it may be modified, suspended or terminated at any time for any reason. We do not intend to purchase shares from our Board or other affiliates. Under Maryland law, such repurchased shares are treated as authorized but unissued. For the year ended December 31, 2014, we repurchased 4,804 shares of our common stock under the Repurchase Program for an aggregate cost of $18,362. At December 31, 2014, there were 45,196 remaining shares authorized for repurchase under our Repurchase Program.
Revenue Recognition	Revenue Recognition
	Interest income is earned and recognized on Agency Securities based on their unpaid principal amounts and their contractual terms. Premiums and discounts associated with the purchase of Multi-Family MBS, which are generally not subject to prepayment, are amortized or accreted into interest income over the contractual lives of the securities using a level yield method. Premiums and discounts associated with the purchase of other Agency Securities are amortized or accreted into interest income over the actual lives of the securities, reflecting actual prepayments as they occur.
Fair Value of Agency Securities	Fair Value of Agency Securities: We invest in Agency Securities representing interests in or obligations backed by pools of fixed rate, hybrid adjustable rate and adjustable rate mortgage loans. The authoritative literature requires us to classify our investments as either trading, available for sale or held to maturity securities. Management determines the appropriate classifications of the securities at the time they are acquired and evaluates the appropriateness of such classifications at each balance sheet date. We currently classify all of our Agency Securities as available for sale. Agency Securities classified as available for sale are reported at their estimated fair values with unrealized gains and losses excluded from earnings and reported as part of the statements of comprehensive income (loss).
	Security purchase and sale transactions, including purchase of "when issued" securities, are recorded on the trade date. Gains or losses realized from the sale of securities are included in income and are determined using the specific identification method.
Impairment of Assets	Impairment of Assets: We evaluate Agency Securities for other than temporary impairment at least on a quarterly basis and more frequently when economic or market concerns warrant such evaluation. We consider an impairment to be other than temporary if we (1) have the intent to sell the Agency Securities, (2) believe it is more likely than not that we will be required to sell the securities before recovery (for example, because of liquidity requirements or contractual obligations) or (3) a credit loss exists. Impairment losses recognized establish a new cost basis for the related Agency Securities.
Comprehensive Income (Loss)	Comprehensive Income (Loss)
	Comprehensive income (loss) refers to changes in equity during a period from transactions and other events and circumstances from non-owner sources. It includes all changes in equity during a period, except those resulting from investments by owners and distributions to owners.
Reclassification	Reclassification
	Interest expense amounts on U.S. Treasury Securities sold short have been presented separately in the December 31, 2013 consolidated statements of operations to conform to the current presentation. Gain (loss) on short sale of U.S. Treasury Securities have been adjusted for this change in the consolidated statements of operations and the consolidated statements of cash flows to conform to current presentation. No other reclassifications have been made to previously reported amounts.

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
		Quoted Prices		Significant		Significant		Balance at December 31, 2013
		in Active		Observable		Unobservable
		Markets for		Inputs		Inputs
		Identical Assets		(Level 2)		(Level 3)
		(Level 1)
	Assets at Fair Value:
	Agency Securities, available for sale	$	—	$	14,648,178	$	—	$	14,648,178
	Derivatives	$	—	$	508,988	$	—	$	508,988
	Liabilities at Fair Value:
	Derivatives	$	1,503	$	101,292	$	—	$	102,795
	The following tables provide a summary of our assets and liabilities that are measured at fair value on a recurring basis at December 31, 2014 and December 31, 2013.
		Quoted Prices		Significant		Significant		Balance at December 31, 2014
		in Active		Observable		Unobservable
		Markets for		Inputs		Inputs
		Identical Assets		(Level 2)		(Level 3)
		(Level 1)
	Assets at Fair Value:
	Agency Securities, available for sale	$	—	$	15,297,529	$	—	$	15,297,529
	Derivatives	$	—	$	60,518	$	—	$	60,518
	Liabilities at Fair Value:
	Derivatives	$	180	$	137,213	$	—	$	137,393
Carrying Values and Fair Values of Financial Assets and Liabilities	The following tables provide a summary of the carrying values and fair values of our financial assets and liabilities not carried at fair value but for which fair value is required to be disclosed at December 31, 2014 and December 31, 2013.
	31-Dec-14					Fair Value Measurements using:
		Carrying Value		Fair		Quoted Prices		Significant		Significant
				Value		in Active		Observable		Unobservable
						Markets for		Inputs		Inputs
						Identical Assets		(Level 2)		(Level 3)
						(Level 1)
	Financial Assets:
	Cash	$	494,561	$	494,561	$	494,561	$	—	$	—
	Cash collateral posted to counterparties	$	129,004	$	129,004	$	—	$	129,004	$	—
	Receivable for unsettled sales	$	260,598	$	260,598	$	—	$	260,598	$	—
	Principal payments receivable	$	93	$	93	$	—	$	93	$	—
	Accrued interest receivable	$	41,915	$	41,915	$	—	$	41,915	$	—
	Financial Liabilities:
	Repurchase agreements	$	13,881,921	$	13,881,921	$	—	$	13,881,921	$	—
	Cash collateral posted by counterparties	$	48,240	$	48,240	$	—	$	48,240	$	—
	Payable for unsettled purchases	$	445,292	$	445,292	$	—	$	445,292	$	—
	Accrued interest payable- repurchase agreements	$	7,012	$	7,012	$	—	$	7,012	$	—
	31-Dec-13					Fair Value Measurements using:
		Carrying Value		Fair		Quoted Prices		Significant		Significant
				Value		in Active		Observable		Unobservable
						Markets for		Inputs		Inputs
						Identical Assets		(Level 2)		(Level 3)
						(Level 1)
	Financial Assets:
	Cash	$	496,478	$	496,478	$	496,478	$	—	$	—
	Cash collateral posted to counterparties	$	35,917	$	35,917	$	—	$	35,917	$	—
	Principal payments receivable	$	70	$	70	$	—	$	70	$	—
	Accrued interest receivable	$	42,034	$	42,034	$	—	$	42,034	$	—
	Financial Liabilities:
	Repurchase agreements	$	13,151,504	$	13,151,504	$	—	$	13,151,504	$	—
	Cash collateral posted by counterparties	$	387,845	$	387,845	$	—	$	387,845	$	—
	Payable for unsettled purchases	$	159,159	$	159,159	$	—	$	159,159	$	—
	Accrued interest payable- repurchase agreements	$	6,629	$	6,629	$	—	$	6,629	$	—

Agency_Securities_Available_fo1

Agency Securities, Available for Sale (Tables)	12 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Available-for-sale Securities	At December 31, 2013, we had the following securities in an unrealized gain or loss position as presented below. The components of the carrying value of our Agency Securities at December 31, 2013 are also presented below. Our Agency Securities had a weighted average coupon of 3.52% at December 31, 2013.
	December 31, 2013	Amortized Cost		Gross Unrealized Loss			Gross Unrealized Gain		Fair Value			Percent of Total
	Fannie Mae
	ARMs&Hybrids	$	55,266	$	(48	)	$	1,174	$	56,392		0.4	%
	10 Year Fixed	1,144		—			25		1,169			0.01
	15 Year Fixed	2,556,986		(20,420		)	2,257		2,538,823			17.33
	20 Year Fixed	2,876,743		(104,357		)	56		2,772,442			18.93
	25 Year Fixed	207,946		—			—		207,946			1.42
	30 Year Fixed	5,230,008		—			—		5,230,008			35.7
	Total Fannie Mae	$	10,928,093	$	(124,825	)	$	3,512	$	10,806,780		73.79	%
	Freddie Mac
	ARMs&Hybrids	17,281		(29		)	428		17,680			0.12
	10 Year Fixed	406		(6		)	2		402			0
	15 Year Fixed	295,357		(3,287		)	1,560		293,630			2
	20 Year Fixed	2,093,482		(69,617		)	694		2,024,559			13.82
	25 Year Fixed	67,436		—			—		67,436			0.46
	30 Year Fixed	1,290,623		—			—		1,290,623			8.81
	Total Freddie Mac	$	3,764,585	$	(72,939	)	$	2,684	$	3,694,330		25.21	%
	Ginnie Mae
	ARMs&Hybrids	145,558		(64		)	1,129		146,623			1
	15 Year Fixed	422		—			23		445			0
	Total Ginnie Mae	$	145,980	$	(64	)	$	1,152	$	147,068		1	%
	Total Agency Securities	$	14,838,658	$	(197,828	)	$	7,348	$	14,648,178		100	%
	At December 31, 2014, we had the following Agency Securities in an unrealized gain or loss position as presented below. The components of the carrying value of our Agency Securities at December 31, 2014 are also presented below. Our Agency Securities had a weighted average coupon of 3.47% at December 31, 2014.
	December 31, 2014	Amortized Cost		Gross Unrealized Loss			Gross Unrealized Gain		Fair Value				Percent of Total
	Fannie Mae
	ARMs & Hybrids	$	40,410	$	(119	)	$	729	$	41,020			0.27	%
	Multi-Family MBS	1,239,227		—			22,676		1,261,903				8.25
	10 Year Fixed	5,336		(3		)	201		5,534				0.04
	15 Year Fixed	7,394,694		(539		)	54,041		7,448,196				48.69
	20 Year Fixed	3,050,676		(13,867		)	16,756		3,053,565				19.96
	25 Year Fixed	21,194		(55		)	—		21,139				0.14
	30 Year Fixed	1,249,696		(227		)	5,765		1,255,234				8.21
	Total Fannie Mae	$	13,001,233	$	(14,810	)	$	100,168	$	13,086,591			85.56	%
	Freddie Mac
	ARMs & Hybrids	14,049		(33		)	246		14,262				0.09
	10 Year Fixed	600		(3		)	8		605				0
	15 Year Fixed	239,438		(315		)	2,499		241,622				1.58
	20 Year Fixed	1,881,496		(12,258		)	8,346		1,877,584				12.27
	Total Freddie Mac	$	2,135,583	$	(12,609	)	$	11,099	$	2,134,073			13.94	%
	Ginnie Mae
	ARMs & Hybrids	75,962		(187		)	665		76,440				0.5
	15 Year Fixed	397		—			28		425				0
	Total Ginnie Mae	$	76,359	$	(187	)	$	693	$	76,865			0.5	%
	Total Agency Securities	$	15,213,175	$	(27,606	)	$	111,960	$	15,297,529			100	%
Investments Classified by Contractual Maturity Date	The following table summarizes the weighted average lives of our Agency Securities at December 31, 2014 and December 31, 2013.
		December 31, 2014					December 31, 2013
	Weighted Average Life of all Agency Securities	Fair Value		Amortized			Fair Value		Amortized
				Cost					Cost
	Less than one year	$	—	$	—		$	2	$	2
	Greater than or equal to one year and less than three years	48,298		47,929			20,289		20,127
	Greater than or equal to three years and less than five years	10,712,331		10,667,135			3,809,418		3,837,530
	Greater than or equal to five years	4,536,900		4,498,111			10,818,469		10,980,999
	Total Agency Securities	$	15,297,529	$	15,213,175		$	14,648,178	$	14,838,658
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	The following table presents the unrealized losses and estimated fair value of our Agency Securities by length of time that such securities have been in a continuous unrealized loss position at December 31, 2014 and December 31, 2013.
		Unrealized Loss Position For:
		Less than 12 Months					12 Months or More						Total
		Fair Value		Unrealized			Fair Value		Unrealized				Fair Value		Unrealized
				Losses					Losses						Losses
	December 31, 2014	$	895,382	$	(2,324	)	$	2,463,523	$	(25,282	)		$	3,358,905	$	(27,606	)
	December 31, 2013	$	7,175,317	$	(197,536	)	$	17,737	$	(292	)		$	7,193,054	$	(197,828	)

Repurchase_Agreements_net_Tabl

Repurchase Agreements, net (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure of Repurchase Agreements [Abstract]
Schedule of Repurchase Agreements	The following table represents the contractual repricing regarding our repurchase agreements to finance Agency Security purchases at December 31, 2014 and December 31, 2013.
			31-Dec-14					31-Dec-13
			Repurchase Agreements			Weighted Average Contractual Rate		Repurchase Agreements		Weighted Average Contractual Rate
	Within 30 days		$	3,994,656		0.36	%	$	3,990,434	0.41	%
	31 days to 60 days		5,631,858			0.37	%	7,098,298		0.41	%
	61 days to 90 days		2,348,839			0.39	%	1,226,694		0.44	%
	Greater than 90 days		1,906,568			0.44	%	836,078		0.43	%
	Total or Weighted Average		$	13,881,921		0.38	%	$	13,151,504	0.42	%
	The following table represents the MRAs and other information regarding our repurchase agreements to finance Agency Security purchases at December 31, 2014 and December 31, 2013.
			31-Dec-14		31-Dec-13
	Number of MRAs		40		35
	Number of counterparties with repurchase agreements outstanding		28		27
	Weighted average maturity in days		60		45
	Haircut for repurchase agreements (1)		4.81	%	4.96	%
	-1	The Haircut represents the weighted average margin requirement, or the percentage amount by which the collateral value must exceed the loan amount. Among other things, it is a measure of our unsecured credit risk to our lenders.

Derivatives_Tables

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2014
Derivative [Line Items]
Schedule of Derivative Instruments	The following tables present information about interest rate swap contracts, interest rate swaptions and Futures Contracts which are included in derivatives on the accompanying consolidated balance sheets at December 31, 2014 and December 31, 2013.
	December 31, 2014
	Derivative Type		Remaining / Underlying Term		Weighted Average Remaining Swap / Option Term (Months)		Weighted Average Rate			Notional Amount				Asset Fair Value (1)				Liability Fair Value (1)
	Interest rate swap contracts		0-12 Months		5		1.13	%		$	920,000			$	—			$	(9,349	)
	Interest rate swap contracts		13-24 Months		16		1.23	%		2,900,000				—				(54,396		)
	Interest rate swap contracts		25-36 Months		31		0.63	%		350,000				2,083				—
	Interest rate swap contracts		37-48 Months		37		1	%		300,000				2,090				—
	Interest rate swap contracts		49-60 Months		59		1.56	%		2,000,000				—				(7,414		)
	Interest rate swap contracts		61-72 Months		61		1.48	%		300,000				2,921				—
	Interest rate swap contracts		73-84 Months		0		0	%		—				—				—
	Interest rate swap contracts		85-96 Months		91		1.47	%		2,450,000				50,650				—
	Interest rate swap contracts		97-108 Months		98		2.08	%		2,800,000				2,774				(7,534		)
	Interest rate swap contracts		109-120 Months		0		0	%		—				—				—
	Interest rate swap contracts		121-132 Months		120		2.66	%		1,000,000				—				(58,520		)
	Futures Contracts		0-15 Months		9		2.11	%		10,000				—				(180		)
	Total or Weighted Average				63		1.6	%		$	13,030,000			$	60,518			$	(137,393	)
	-1	See Note 5, “Fair Value of Financial Instruments” for additional discussion.
	December 31, 2013
	Derivative Type		Remaining / Underlying Term		Weighted Average Remaining Swap / Option Term (Months)		Weighted Average Rate			Notional Amount				Asset Fair Value (1)				Liability Fair Value (1)
	Interest rate swap contracts		0-12 Months		2		1.14	%		$	200,000			$	—			$	(2,089	)
	Interest rate swap contracts		13-24 Months		17		1.13	%		920,000				—				(18,095		)
	Interest rate swap contracts		25-36 Months		28		1.23	%		2,900,000				—				(81,108		)
	Interest rate swap contracts		37-48 Months		43		0.63	%		350,000				2,614				—
	Interest rate swap contracts		49-60 Months		49		1	%		300,000				3,817				—
	Interest rate swap contracts		61-72 Months		0		0	%		—				—				—
	Interest rate swap contracts		73-84 Months		73		1.48	%		300,000				11,112				—
	Interest rate swap contracts		85-96 Months		0		0	%		—				—				—
	Interest rate swap contracts		97-108 Months		103		1.47	%		2,450,000				195,221				—
	Interest rate swap contracts		109-120 Months		110		2.08	%		2,800,000				184,456				—
	Futures Contracts		0-21 Months		13		1.97	%		55,000				—				(1,503		)
	Interest rate swaptions		60 Months		9		2.73	%		4,000,000				35,937				—
	Interest rate swaptions		120 Months		6		3.16	%		1,750,000				75,831				—
	Total or Weighted Average				47		1.98	%		$	16,025,000			$	508,988			$	(102,795	)
	-1	See Note 5, “Fair Value of Financial Instruments” for additional discussion.
Derivative Instruments, Gain (Loss)	The following table represents the location and information regarding our derivatives which are included in Other Income (Loss) in the accompanying consolidated statements of operations for the years ended December 31, 2014, December 31, 2013 and December 31, 2012.
					Income (Loss) Recognized
					For the Year Ended
	Derivatives		Location on consolidated statements of operations		December 31, 2014				December 31, 2013				December 31, 2012
	Interest rate swap contracts:
	Realized gain		Realized loss on derivatives		$	—			$	25,686			$	—
	Interest income		Realized loss on derivatives		14,213				17,180				8,882
	Interest expense		Realized loss on derivatives		(154,874		)		(158,465		)		(69,479		)
	Changes in fair value		Unrealized gain (loss) on derivatives		(371,266		)		499,193				(39,278		)
					$	(511,927	)		$	383,594			$	(99,875	)
	Interest rate swaptions:
	Realized gain		Realized loss on derivatives		23,318				(17,778		)		—
	Changes in fair value		Unrealized gain (loss) on derivatives		(92,687		)		43,034				(20,869		)
					$	(69,369	)		$	25,256			$	(20,869	)
	Futures Contracts:
	Realized loss		Realized loss on derivatives		(1,373		)		(2,531		)		(2,442		)
	Changes in fair value		Unrealized gain (loss) on derivatives		1,323				2,416				1,373
					$	(50	)		$	(115	)		$	(1,069	)
	Totals				$	(581,346	)		$	408,735			$	(121,813	)
Derivative
Derivative [Line Items]
Offsetting Assets	The following tables present information about interest rate swap contracts, interest rate swaptions and Futures Contracts and the potential effects of netting if we were to offset the assets and liabilities of these financial instruments on the accompanying consolidated balance sheets. Currently, we present these financial instruments at their gross amounts and they are included in derivatives, at fair value on the accompanying consolidated balance sheet at December 31, 2013.
	31-Dec-13						Gross Amounts Not Offset in the Consolidated Balance Sheet
	Assets		Gross and Net Amounts of Assets Presented in the Consolidated				Financial				Cash Collateral				Net Amount
			Balance Sheet				Instruments
	Interest rate swap contracts		$	397,219			$	(101,292	)		$	(313,229	)		$	(17,302	)
	Interest rate swaptions		111,769				—				—				111,769
	Totals		$	508,988			$	(101,292	)		$	(313,229	)		$	94,467
	The following tables present information about interest rate swap contracts, interest rate swaptions and Futures Contracts and the potential effects of netting if we were to offset the assets and liabilities of these financial instruments on the accompanying consolidated balance sheets. Currently, we present these financial instruments at their gross amounts and they are included in derivatives, at fair value on the accompanying consolidated balance sheet at December 31, 2014.
	31-Dec-14						Gross Amounts Not Offset in the Consolidated Balance Sheet
	Assets		Gross and Net Amounts of Assets Presented in the Consolidated Balance Sheet				Financial				Cash Collateral				Net Amount
							Instruments
	Interest rate swap contracts		$	60,518			$	(137,213	)		$	119,561			$	42,866
	Totals		$	60,518			$	(137,213	)		$	119,561			$	42,866
Offsetting Liabilities
	31-Dec-14						Gross Amounts Not Offset in the Consolidated Balance Sheet
	Liabilities		Gross and Net Amounts of Liabilities Presented in the Consolidated Balance Sheet				Financial				Cash Collateral				Net Amount
							Instruments
	Interest rate swap contracts		$	(137,213	)		$	137,213			$	—			$	—
	Futures Contracts		(180		)		—				227				47
	Totals		$	(137,393	)		$	137,213			$	227			$	47
	31-Dec-13						Gross Amounts Not Offset in the Consolidated Balance Sheet
	Liabilities		Gross and Net Amounts of Liabilities Presented in the Consolidated Balance Sheet				Financial				Cash Collateral				Net Amount
							Instruments
	Interest rate swap contracts		$	(101,292	)		$	101,292			$	—			$	—
	Futures Contracts		(1,503		)		—				1,599				96
	Totals		$	(102,795	)		$	101,292			$	1,599			$	96

Stock_Based_Compensation_Table

Stock Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Nonvested Restricted Stock Units Activity	Transactions related to awards for the year ended December 31, 2014 are summarized below:
		December 31, 2014
		Number of		Weighted
		Awards		Average Grant
				Date Fair Value
				per Award
	Unvested Awards Outstanding beginning of period	1,329		$	6.94
	Awards issued upon stockholders' approval of Plan amendment	150		$	3.74
	Vested	(424	)	$	7.07
	Unvested Awards Outstanding end of period	1,055		$	6.47

Shareholders_Equity_Tables

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Dividends Transactions	The following tables present our common stock dividend transactions for the years ended December 31, 2014, December 31, 2013 and December 31, 2012.
	December 31, 2014
	Record Date		Payment Date	Rate per common share			Aggregate
							amount paid to
							holders of record
	15-Jan-14		30-Jan-14	$	0.05		$	17,954
	14-Feb-14		27-Feb-14	$	0.05		17,954
	17-Mar-14		28-Mar-14	$	0.05		17,945
	15-Apr-14		29-Apr-14	$	0.05		17,925
	15-May-14		29-May-14	$	0.05		17,924
	16-Jun-14		27-Jun-14	$	0.05		17,924
	15-Jul-14		30-Jul-14	$	0.05		17,923
	15-Aug-14		29-Aug-14	$	0.05		17,923
	15-Sep-14		29-Sep-14	$	0.05		17,923
	15-Oct-14		30-Oct-14	$	0.05		17,923
	17-Nov-14		26-Nov-14	$	0.05		17,923
	15-Dec-14		30-Dec-14	$	0.05		17,922
	Total dividends paid						$	215,163
	December 31, 2013
	Record Date		Payment Date	Rate per common share			Aggregate amount paid to holders of record
	January 15,  2013		30-Jan-13	$	0.08		$	24,772
	15-Feb-13		27-Feb-13	$	0.08		24,773
	15-Mar-13		27-Mar-13	$	0.08		30,284
	15-Apr-13		29-Apr-13	$	0.07		26,313
	15-May-13		30-May-13	$	0.07		26,313
	14-Jun-13		27-Jun-13	$	0.07		26,088
	15-Jul-13		30-Jul-13	$	0.07		26,074
	15-Aug-13		29-Aug-13	$	0.07		26,074
	16-Sep-13		27-Sep-13	$	0.07		26,079
	15-Oct-13		28-Oct-13	$	0.05		18,624
	15-Nov-13		27-Nov-13	$	0.05		18,624
	16-Dec-13		27-Dec-13	$	0.05		18,574
	Total dividends paid						$	292,592
	December 31, 2012
	Record Date		Payment Date	Rate per common share			Aggregate amount paid to holders of record
	January 15,  2012		30-Jan-12	$	0.11		$	11,659
	15-Feb-12		28-Feb-12	$	0.11		15,329
	15-Mar-12		29-Mar-12	$	0.11		19,768
	16-Apr-12		27-Apr-12	$	0.1		17,840
	15-May-12		30-May-12	$	0.1		18,105
	15-Jun-12		28-Jun-12	$	0.1		18,667
	16-Jul-12		30-Jul-12	$	0.1		23,498
	15-Aug-12		30-Aug-12	$	0.1		29,958
	14-Sep-12		27-Sep-12	$	0.1		30,973
	15-Oct-12		30-Oct-12	$	0.09		27,868
	15-Nov-12		29-Nov-12	$	0.09		27,869
	14-Dec-12		28-Dec-12	$	0.09		27,969
	Total dividends paid						$	269,503
	The following tables present our Series A Preferred Stock dividend transactions for the years ended December 31, 2014, December 31, 2013 and December 31, 2012.
	December 31, 2014
	Record Date		Payment Date	Rate per			Aggregate
				Series A			amount paid to
				Preferred			holders of record
				Share
	15-Jan-14		27-Jan-14	$	0.17		$	374.8
	15-Feb-14		27-Feb-14	$	0.17		374.8
	15-Mar-14		27-Mar-14	$	0.17		374.8
	15-Apr-14		28-Apr-14	$	0.17		374.8
	15-May-14		27-May-14	$	0.17		374.8
	15-Jun-14		27-Jun-14	$	0.17		374.8
	15-Jul-14		28-Jul-14	$	0.17		374.8
	15-Aug-14		27-Aug-14	$	0.17		374.8
	15-Sep-14		29-Sep-14	$	0.17		374.8
	15-Oct-14		27-Oct-14	$	0.17		374.8
15-Nov-14		28-Nov-14	$	0.17		374.8
15-Dec-14		29-Dec-14	$	0.17		374.8
Total dividends paid						$	4,497.60
December 31, 2013
Record Date		Payment Date	Rate per Series A Preferred share			Aggregate amount paid to holders of record
January 15,  2013		28-Jan-13	$	0.17		$	357.6
15-Feb-13		26-Feb-13	$	0.17		374.8
15-Mar-13		26-Mar-13	$	0.17		374.8
15-Apr-13		29-Apr-13	$	0.17		374.8
15-May-13		27-May-13	$	0.17		374.8
14-Jun-13		27-Jun-13	$	0.17		374.8
15-Jul-13		29-Jul-13	$	0.17		374.8
15-Aug-13		27-Aug-13	$	0.17		374.8
15-Sep-13		27-Sep-13	$	0.17		374.8
15-Oct-13		28-Oct-13	$	0.17		374.8
15-Nov-13		27-Nov-13	$	0.17		374.8
15-Dec-13		27-Dec-13	$	0.17		374.8
Total dividends paid						$	4,480.40
December 31, 2012
Record Date		Payment Date	Rate per Series A Preferred share			Aggregate amount paid to holders of record
July 13, 2012 (1)		27-Jul-12	$	0.29		$	401
15-Aug-12		27-Aug-12	$	0.17		272
14-Sep-12		27-Sep-12	$	0.17		292
15-Oct-12		29-Oct-12	$	0.17		315
15-Nov-12		27-Nov-12	$	0.17		339
14-Dec-12		27-Dec-12	$	0.17		344.6
Total dividends paid						$	1,963.60
(1)This amount included $160 paid to holders of record on July 13, 2012 for the period of June 7, 2012 through June 30, 2012.
The following tables present our Series B Preferred Stock dividend transactions for the years ended December 31, 2014 and December 31, 2013. There were no Series B Preferred Stock dividend transactions for the year ended December 31, 2012.
December 31, 2014
Record Date		Payment Date	Rate per			Aggregate
			Series B			amount paid to
			Preferred			holders of record
			Share
15-Jan-14		27-Jan-14	$	0.16		$	926.9
15-Feb-14		27-Feb-14	$	0.16		$	926.9
15-Mar-14		27-Mar-14	$	0.16		$	926.9
15-Apr-14		28-Apr-14	$	0.16		$	926.9
15-May-14		27-May-14	$	0.16		$	926.9
15-Jun-14		27-Jun-14	$	0.16		$	926.9
15-Jul-14		28-Jul-14	$	0.16		$	926.9
15-Aug-14		27-Aug-14	$	0.16		$	926.9
15-Sep-14		29-Sep-14	$	0.16		$	926.9
15-Oct-14		27-Oct-14	$	0.16		$	926.9
15-Nov-14		28-Nov-14	$	0.16		$	926.9
15-Dec-14		29-Dec-14	$	0.16		$	926.9
Total dividends paid						$	11,122.80
December 31, 2013
Record Date		Payment Date	Rate per Series B Preferred share			Aggregate amount paid to holders of record
15-Mar-13		27-Mar-13	$	0.25		$	1,391.00
15-Apr-13		29-Apr-13	$	0.16		926.9
15-May-13		27-May-13	$	0.16		926.9
14-Jun-13		27-Jun-13	$	0.16		926.9
15-Jul-13		29-Jul-13	$	0.16		926.9
15-Aug-13		27-Aug-13	$	0.16		926.9
15-Sep-13		27-Sep-13	$	0.16		926.9
15-Oct-13		28-Oct-13	$	0.16		926.9
15-Nov-13		27-Nov-13	$	0.16		926.9
15-Dec-13		27-Dec-13	$	0.16		926.9
Total dividends paid						$	9,733.10
Schedule of Stockholders Equity	The following tables present our equity transactions for the years ended December 31, 2014, December 31, 2013 and December 31, 2012.
	December 31, 2014
	Transaction Type		Completion Date	Number of		Per Share			Net Proceeds
				Shares		price (1)
	Common stock dividend reinvestment program		January 27, 2014 through December 30, 2014	66		$	4.12		$	269
	-1	Weighted average price
	December 31, 2013
	Transaction Type		Completion Date	Number of		Per Share price (1)			Net Proceeds
				Shares
	Series A Preferred equity distribution agreements		January 2, 2013 to January 30, 2013	175		$	25.51		$	4,380
	Common stock dividend reinvestment program		January 25, 2013 to December 27, 2013	67		$	4.83		$	—
	Series B Preferred initial offering		20-Feb-13	5,650		$	25		$	136,553
	Common stock follow-on public offering		20-Feb-13	65,000		$	6.75		$	438,582
	(1)  Weighted average price
	December 31, 2012
	Transaction Type		Completion Date	Number of		Per Share price (1)			Net Proceeds
				Shares
	Follow-on public offering		13-Jan-12	10,350		$	6.8		$	70,179
	Follow-on public offering		8-Feb-12	29,900		$	6.8		$	203,033
	Equity distribution agreement		29-Feb-12	1,287		$	7.06		$	8,902
	Follow-on public offering		14-Mar-12	35,650		$	6.72		$	239,168
	Issuance of Series A Preferred Stock		7-Jun-12	1,400		$	25		$	33,780
	Follow-on public offering		13-Jul-12	46,000		$	7.06		$	324,474
	Follow-on public offering		8-Aug-12	63,250		$	7.3		$	461,435
	Common equity distribution agreements		January 18, 2012 to September 11, 2012	19,750		$	7.14		$	138,159
	Preferred equity distribution agreements		July 16, 2012 to December 27, 2012	606		$	25.54		$	15,014
	Dividend Reinvestment and Stock Purchase Plan		January 25, 2012 to December 28, 2012	7,286		$	7.28		$	52,888
	(1)  Weighted average price
	The following tables present our common stock repurchases for the year ended December 31, 2014 and December 31, 2013. We did not have any common stock repurchases for the year ended December 31, 2012.
	December 31, 2014
	Transaction Type		Completion Date	Number of		Per Share price (1)			Net Cost
				Shares
	Repurchased common shares		March 12, 2014 through December 31, 2014	4,804		$	3.82		$	18,362
	-1	Weighted average price
	December 31, 2013
	Transaction Type		Completion Date	Number of		Per Share price (1)			Net Cost
				Shares
	Repurchased common shares		May 15, 2013 to May 17, 2013	3,396		$	5.94		$	20,259
	Repurchased common shares		December 11, 2013 to December 31, 2013	13,375		$	3.89		$	52,435
	(1)  Weighted average price

Income_Loss_per_Common_Share_T

Income (Loss) per Common Share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Schedule of Weighted Average Number of Shares	The following table presents a reconciliation of net income (loss) and the shares used in calculating weighted average basic and diluted earnings per common share for the years ended December 31, 2014, December 31, 2013 and December 31, 2012.
		For the Year Ended
		31-Dec-14			31-Dec-13			December 31, 2012
	Net Income (loss)	$	(179,048	)	$	(187,044	)	$	222,306
	Less: Preferred dividends	(15,620		)	(14,213		)	(1,964		)
	Net income (loss) available (related) to common stockholders	$	(194,668	)	$	(201,257	)	$	220,342
	Weighted average common shares outstanding – basic	357,233			362,830			223,627
	Add: Effect of dilutive non-vested awards, assumed vested	—			—			636
	Weighted average common shares outstanding – diluted	357,233			362,830			224,263

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Effective Income Tax Rate Reconciliation	The following table reconciles our GAAP net income to estimated REIT taxable income for the years ended December 31, 2014, December 31, 2013 and December 31, 2012.
		For the Year Ended
		31-Dec-14			31-Dec-13			December 31, 2012
	GAAP net income (loss)	$	(179,048	)	$	(187,044	)	$	222,306
	Book to tax differences:
	Changes in interest rate contracts	439,312			(551,359		)	58,774
	(Gains) Losses on Security Sales	(54,082		)	579,322			—
	Other than temporary loss on Agency Securities	—			401,541			—
	Amortization of deferred hedging costs	(1,174		)	(2,030		)	—
	Net premium amortization differences	(5,609		)	—			—
	Other	21			18			94
	Estimated taxable income	$	199,420		$	240,448		$	281,174

Quarterly_Financial_Data_unaud1

Quarterly Financial Data (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	The following tables are a comparative breakdown of our unaudited quarterly financial results for the immediately preceding eight quarters.
		Quarter Ended
		March 31,			June 30,			September 30,			December 31,
		2014			2014			2014			2014
	Interest income, net of premium amortization	$	123,082		$	113,892		$	107,481		$	106,472
	Interest expense- repurchase agreements	(14,747		)	(14,979		)	(15,006		)	(14,830		)
	Interest expense- U.S. Treasury Securities sold short	—			(4,263		)	(160		)	(1,128		)
	Net Interest Income	$	108,335		$	94,650		$	92,315		$	90,514
	Realized gain (loss) on sale of Agency Securities (reclassified from Other comprehensive income (loss))	69,869			11,167			(12,390		)	124
	Gain (loss) on short sale of U.S. Treasury Securities	—			(15,781		)	3,086			(1,993		)
	Realized loss on derivatives (1)	(11,739		)	(34,498		)	(34,655		)	(37,824		)
	Unrealized gain (loss) on derivatives	(176,355		)	(116,273		)	14,708			(184,710		)
	Expenses	(9,888		)	(9,455		)	(8,972		)	(9,283		)
	Income tax benefit (expense)	—			—			—			—
	Net Income (Loss)	$	(19,778	)	$	(70,190	)	$	54,092		$	(143,172	)
	Dividends declared on preferred stock	(3,905		)	(3,905		)	(3,905		)	(3,905		)
	Net Income (Loss) available (related) to common stockholders	$	(23,683	)	$	(74,095	)	$	50,187		$	(147,077	)
	Net income (loss) available (related) per share to common stockholders – Basic	$	(0.07	)	$	(0.21	)	$	0.14		$	(0.41	)
	Net income (loss) available (related) per share to common stockholders – Diluted	$	(0.07	)	$	(0.21	)	$	0.14		$	(0.41	)
	Dividends declared per common share	$	0.15		$	0.15		$	0.15		$	0.15
	Weighted average common shares outstanding – Basic	357,496			357,111			357,196			357,134
	Weighted average common shares outstanding – Diluted	357,496			357,111			358,357			357,134
	(1) Interest expense related to our interest rate swap contracts is recorded in realized loss on derivatives on the consolidated statements of operations
		Quarter Ended
		March 31,			June 30,			September 30,			December 31,
		2013			2013			2013			2013
	Interest income, net of premium amortization	$	130,637		$	141,159		$	112,418		$	121,229
	Interest expense- repurchase agreements	(25,475		)	(23,578		)	(17,811		)	(16,249		)
	Interest expense- U.S. Treasury Securities sold short	—			(17		)	(1,420		)	—
	Net Interest Income	$	105,162		$	117,564		$	93,187		$	104,980
	Realized gain (loss) on sale of Agency Securities (reclassified from Other comprehensive income (loss))	18,514			20,876			(300,960		)	(331,929		)
	Other than temporary impairment of Agency Securities	—			—			—			(401,541		)
	Gain (loss) on short sale of U.S. Treasury Securities	—			(21,078		)	36,587			—
	Realized loss on derivatives (1)	(29,053		)	(38,858		)	(37,262		)	(30,735		)
	Unrealized gain (loss) on derivatives	16,301			412,183			(11,821		)	127,980
	Expenses	(8,634		)	(9,302		)	(9,684		)	(9,531		)
	Income tax benefit	—			—			10			—
	Net Income (Loss)	$	102,290		$	481,385		$	(229,943	)	$	(540,776	)
	Dividends declared on preferred stock	(2,497		)	(3,905		)	(3,905		)	(3,906		)
	Net Income (Loss) available (related) to common stockholders	$	99,793		$	477,480		$	(233,848	)	$	(544,682	)
	Net income (loss) available (related) per share to common stockholders – Basic	$	0.3		$	1.28		$	(0.63	)	$	(1.47	)
	Net income (loss) available (related) per share to common stockholders – Diluted	$	0.29		$	1.28		$	(0.63	)	$	(1.47	)
	Dividends declared per common share	$	0.24		$	0.21		$	0.21		$	0.15
	Weighted average common shares outstanding – Basic	337,935			372,591			370,818			369,543
	Weighted average common shares outstanding – Diluted	339,722			374,135			372,256			369,543
	(1) Interest expense related to our interest rate swap contracts is recorded in realized loss on derivatives on the consolidated statements of operations.

Organization_and_Nature_of_Bus1

Organization and Nature of Business Operations (Details) (Portfolio Concentration Risk, Available-for-sale Securities)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Portfolio Concentration Risk | Available-for-sale Securities
Concentration Risk [Line Items]
Percentage of portfolio invested in agency securities	100.00%	100.00%
Expected percentage of portfolio invested in agency securities	100.00%

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Details) (USD $)	0 Months Ended	1 Months Ended	10 Months Ended	12 Months Ended
In Thousands, except Share data, unless otherwise specified	17-May-13	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Mar. 05, 2014
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)		50,000,000	50,000,000	50,000,000	50,000,000
Preferred stock, par value (in dollars per share)		$0.00	$0.00	$0.00	$0.00
Preferred stock, undesignated shares authorized			34,180,000	34,180,000
Common stock, shares authorized (in Shares)		1,000,000,000	1,000,000,000	1,000,000,000	1,000,000,000
Common stock, par value (in Dollars per share)		$0.00	$0.00	$0.00	$0.00
Common stock, shares issued (in Shares)		357,613,000	353,159,000	353,159,000	357,613,000
Common stock, shares outstanding (in Shares)		357,613,000	353,159,000	353,159,000	357,613,000
Stock repurchase program, shares authorized (in Shares)						50,000,000
Common stock repurchased (in Shares)	3,396,000	13,375,000	4,804,000
Common stock repurchased	$20,259	$52,435	$18,362	$18,362	$72,694
Stock repurchase program, remaining authorized (in Shares)			45,196,000	45,196,000
Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)			9,610,000	9,610,000
Preferred stock, par value (in dollars per share)		$0.00	$0.00	$0.00	$0.00
Preferred stock, dividend rate				8.25%	8.25%
Preferred stock, shares issued		2,181,000	2,181,000	2,181,000	2,181,000
Preferred stock, shares outstanding		2,181,000	2,181,000	2,181,000	2,181,000
Preferred stock, liquidation preference per share (in dollars per share)		$25	$25	$25	$25
Preferred stock, aggregate liquidation preference		54,514	54,514	54,514	54,514
Preferred stock, designated but unissued shares authorized			7,429,000	7,429,000
Preferred stock, redemption price per share (in dollars per share)			$25	$25
Period stock receives voting rights if dividends are not paid				18
Number of additional directors elected				2
Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)			6,210,000	6,210,000
Preferred stock, par value (in dollars per share)		$0.00	$0.00	$0.00	$0.00
Preferred stock, dividend rate				7.88%	7.88%
Preferred stock, shares issued		5,650,000	5,650,000	5,650,000	5,650,000
Preferred stock, shares outstanding		5,650,000	5,650,000	5,650,000	5,650,000
Preferred stock, liquidation preference per share (in dollars per share)		$25	$25	$25	$25
Preferred stock, aggregate liquidation preference		141,250	141,250	141,250	141,250
Preferred stock, designated but unissued shares authorized			560,000	560,000
Preferred stock, redemption price per share (in dollars per share)			$25	$25
Period stock receives voting rights if dividends are not paid				18
Number of additional directors elected				2
Common Stock
Class of Stock [Line Items]
Common stock repurchased (in Shares)				4,804,000	16,771,000
Common stock repurchased				$5	$17

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments Fair Value of Financial Instruments (Details) - Additional Information	12 Months Ended
	Dec. 31, 2014
	dealer
Fair Value Disclosures [Abstract]
Number of dealers received quotes from	3

Fair_Value_of_Financial_Instru3

Fair Value of Financial Instruments (Details) - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets at Fair Value:
Derivatives	$60,518	$508,988
Liabilities at Fair Value:
Derivatives	137,393	102,795
Fair Value, Measurements, Recurring
Assets at Fair Value:
Agency Securities, available for sale	15,297,529	14,648,178
Derivatives	60,518	508,988
Liabilities at Fair Value:
Derivatives	137,393	102,795
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Liabilities at Fair Value:
Derivatives	180	1,503
Fair Value, Measurements, Recurring | Significant Observable Inputs (Level 2)
Assets at Fair Value:
Agency Securities, available for sale	15,297,529	14,648,178
Derivatives	60,518	508,988
Liabilities at Fair Value:
Derivatives	$137,213	$101,292

Fair_Value_of_Financial_Instru4

Fair Value of Financial Instruments (Details) - Carrying Values and Fair Values of Financial Assets and Liabilities (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financial Liabilities:
Payable for unsettled purchases	$445,527	$158,850
Carrying Value
Financial Assets:
Cash	494,561	496,478
Cash collateral posted to counterparties	129,004	35,917
Receivable for unsettled sales	260,598
Principal payments receivable	93	70
Accrued interest receivable	41,915	42,034
Financial Liabilities:
Repurchase agreements	13,881,921	13,151,504
Cash collateral posted by counterparties	48,240	387,845
Payable for unsettled purchases	445,292	159,159
Accrued interest payable- repurchase agreements	7,012	6,629
Fair Value
Financial Assets:
Cash	494,561	496,478
Cash collateral posted to counterparties	129,004	35,917
Receivable for unsettled sales	260,598
Principal payments receivable	93	70
Accrued interest receivable	41,915	42,034
Financial Liabilities:
Repurchase agreements	13,881,921	13,151,504
Cash collateral posted by counterparties	48,240	387,845
Payable for unsettled purchases	445,292	159,159
Accrued interest payable- repurchase agreements	7,012	6,629
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets:
Cash	494,561	496,478
Significant Observable Inputs (Level 2)
Financial Assets:
Cash collateral posted to counterparties	129,004	35,917
Receivable for unsettled sales	260,598
Principal payments receivable	93	70
Accrued interest receivable	41,915	42,034
Financial Liabilities:
Repurchase agreements	13,881,921	13,151,504
Cash collateral posted by counterparties	48,240	387,845
Payable for unsettled purchases	445,292	159,159
Accrued interest payable- repurchase agreements	$7,012	$6,629

Agency_Securities_Available_fo2

Agency Securities, Available for Sale (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Other than temporary impairment of Agency Securities					$401,541	$0	$0	$0	$0	$401,541	$0
Available-for-sale securities fair value	15,297,529				14,648,178				15,297,529	14,648,178
Weighted average coupon rate	3.47%				3.52%				3.47%	3.52%
Payable for unsettled purchases	445,292				159,159				445,292	159,159
Payable for unsettled purchases, fair value	445,527				158,850				445,527	158,850
Gross realized gains (losses) from sale proceeds									10,595,518	14,965,888	4,149,321
Realized gain (loss) on sale of Agency Securities	124	-12,390	11,167	69,869	-331,929	-300,960	20,876	18,514	68,770	-593,498	40,627
25-Year and 30-Year Fixed Rate Agency Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities fair value					$6,800,000					$6,800,000
Available-for-sale Securities | Portfolio Concentration Risk
Schedule of Available-for-sale Securities [Line Items]
Percentage of portfolio invested in agency securities									100.00%	100.00%

Agency_Securities_Available_fo3

Agency Securities, Available for Sale (Details) - Unrealized Gain or Loss Position and Components of Carrying Value of Available for Sale Agency Securities (June 30, 2013) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	15,213,175	14,838,658
Gross Unrealized Loss	-27,606	-197,828
Gross Unrealized Gain	111,960	7,348
Fair Value	15,297,529	14,648,178
Portfolio Concentration Risk | Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Percentage of concentration risk	100.00%	100.00%
Fannie Mae
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,001,233	10,928,093
Gross Unrealized Loss	-14,810	-124,825
Gross Unrealized Gain	100,168	3,512
Fair Value	13,086,591	10,806,780
Fannie Mae | Portfolio Concentration Risk | Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Percentage of concentration risk	85.56%	73.79%
Fannie Mae | ARMs & Hybrids
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	40,410	55,266
Gross Unrealized Loss	-119	-48
Gross Unrealized Gain	729	1,174
Fair Value	41,020	56,392
Fannie Mae | ARMs & Hybrids | Portfolio Concentration Risk | Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Percentage of concentration risk	0.27%	0.40%
Fannie Mae | Multi-Family MBS
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,239,227
Gross Unrealized Loss	0
Gross Unrealized Gain	22,676
Fair Value	1,261,903
Fannie Mae | Multi-Family MBS | Portfolio Concentration Risk | Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Percentage of concentration risk	8.25%
Fannie Mae | 10 Year Fixed
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,336	1,144
Gross Unrealized Loss	-3	0
Gross Unrealized Gain	201	25
Fair Value	5,534	1,169
Fannie Mae | 10 Year Fixed | Portfolio Concentration Risk | Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Percentage of concentration risk	0.04%	0.01%
Fannie Mae | 15 Year Fixed
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,394,694	2,556,986
Gross Unrealized Loss	-539	-20,420
Gross Unrealized Gain	54,041	2,257
Fair Value	7,448,196	2,538,823
Fannie Mae | 15 Year Fixed | Portfolio Concentration Risk | Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Percentage of concentration risk	48.69%	17.33%
Fannie Mae | 20 Year Fixed
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,050,676	2,876,743
Gross Unrealized Loss	-13,867	-104,357
Gross Unrealized Gain	16,756	56
Fair Value	3,053,565	2,772,442
Fannie Mae | 20 Year Fixed | Portfolio Concentration Risk | Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Percentage of concentration risk	19.96%	18.93%
Fannie Mae | 25 Year Fixed
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,194	207,946
Gross Unrealized Loss	-55	0
Gross Unrealized Gain	0	0
Fair Value	21,139	207,946
Fannie Mae | 25 Year Fixed | Portfolio Concentration Risk | Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Percentage of concentration risk	0.14%	1.42%
Fannie Mae | 30 Year Fixed
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,249,696	5,230,008
Gross Unrealized Loss	-227	0
Gross Unrealized Gain	5,765	0
Fair Value	1,255,234	5,230,008
Fannie Mae | 30 Year Fixed | Portfolio Concentration Risk | Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Percentage of concentration risk	8.21%	35.70%
Freddie Mac
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,135,583	3,764,585
Gross Unrealized Loss	-12,609	-72,939
Gross Unrealized Gain	11,099	2,684
Fair Value	2,134,073	3,694,330
Freddie Mac | Portfolio Concentration Risk | Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Percentage of concentration risk	13.94%	25.21%
Freddie Mac | ARMs & Hybrids
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,049	17,281
Gross Unrealized Loss	-33	-29
Gross Unrealized Gain	246	428
Fair Value	14,262	17,680
Freddie Mac | ARMs & Hybrids | Portfolio Concentration Risk | Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Percentage of concentration risk	0.09%	0.12%
Freddie Mac | 10 Year Fixed
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	600	406
Gross Unrealized Loss	-3	-6
Gross Unrealized Gain	8	2
Fair Value	605	402
Freddie Mac | 10 Year Fixed | Portfolio Concentration Risk | Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Percentage of concentration risk	0.00%	0.00%
Freddie Mac | 15 Year Fixed
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	239,438	295,357
Gross Unrealized Loss	-315	-3,287
Gross Unrealized Gain	2,499	1,560
Fair Value	241,622	293,630
Freddie Mac | 15 Year Fixed | Portfolio Concentration Risk | Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Percentage of concentration risk	1.58%	2.00%
Freddie Mac | 20 Year Fixed
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,881,496	2,093,482
Gross Unrealized Loss	-12,258	-69,617
Gross Unrealized Gain	8,346	694
Fair Value	1,877,584	2,024,559
Freddie Mac | 20 Year Fixed | Portfolio Concentration Risk | Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Percentage of concentration risk	12.27%	13.82%
Freddie Mac | 25 Year Fixed
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		67,436
Gross Unrealized Loss		0
Gross Unrealized Gain		0
Fair Value		67,436
Freddie Mac | 25 Year Fixed | Portfolio Concentration Risk | Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Percentage of concentration risk		0.46%
Freddie Mac | 30 Year Fixed
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,290,623
Gross Unrealized Loss		0
Gross Unrealized Gain		0
Fair Value		1,290,623
Freddie Mac | 30 Year Fixed | Portfolio Concentration Risk | Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Percentage of concentration risk		8.81%
Ginnie Mae
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	76,359	145,980
Gross Unrealized Loss	-187	-64
Gross Unrealized Gain	693	1,152
Fair Value	76,865	147,068
Ginnie Mae | Portfolio Concentration Risk | Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Percentage of concentration risk	0.50%	1.00%
Ginnie Mae | ARMs & Hybrids
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	75,962	145,558
Gross Unrealized Loss	-187	-64
Gross Unrealized Gain	665	1,129
Fair Value	76,440	146,623
Ginnie Mae | ARMs & Hybrids | Portfolio Concentration Risk | Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Percentage of concentration risk	0.50%	1.00%
Ginnie Mae | 15 Year Fixed
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	397	422
Gross Unrealized Loss	0	0
Gross Unrealized Gain	28	23
Fair Value	425	445
Ginnie Mae | 15 Year Fixed | Portfolio Concentration Risk | Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Percentage of concentration risk	0.00%	0.00%

Agency_Securities_Available_fo4

Agency Securities, Available for Sale (Details) - Summary of Weighted Average Lives of Agency Securities (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value
Less than one year	$0	$2
Greater than or equal to one year and less than three years	48,298	20,289
Greater than or equal to three years and less than five years	10,712,331	3,809,418
Greater than or equal to five years	4,536,900	10,818,469
Total Agency Securities	15,297,529	14,648,178
Amortized Cost
Less than one year	0	2
Greater than or equal to one year and less than three years	47,929	20,127
Greater than or equal to three years and less than five years	10,667,135	3,837,530
Greater than or equal to five years	4,498,111	10,980,999
Amortized Cost	$15,213,175	$14,838,658

Agency_Securities_Available_fo5

Agency Securities, Available for Sale (Details) - Gross Unrealized Losses and Estimated Fair Value of Agency Securities (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value
Less than 12 Months	$895,382	$7,175,317
12 Months or More	2,463,523	17,737
Total	3,358,905	7,193,054
Unrealized Losses
Less than 12 Months	-2,324	-197,536
Unrealized Losses	-25,282	-292
Unrealized Losses	($27,606)	($197,828)

Repurchase_Agreements_net_Deta

Repurchase Agreements, net (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Concentration Risk [Line Items]
Proceeds from short sales of U.S. Treasury Securities									$2,005,363	$2,783,711	$0
Purchases of U.S. Treasury Securities									2,020,051	2,768,203	0
Gain (loss) on short sale of U.S. Treasury Securities	($1,993)	$3,086	($15,781)	$0	$0	$36,587	($21,078)	$0	($14,688)	$15,508	$0
Counterparty Concentration Risk | Repurchase Agreement Borrowings
Concentration Risk [Line Items]
Number of counterparties	7								7
Percentage of concentration risk									48.11%
Counterparty Concentration Risk | Repurchase Agreement Borrowings | Minimum
Concentration Risk [Line Items]
Percentage of concentration risk									5.00%
Counterparty Concentration Risk | Repurchase Agreement Borrowings | Maximum
Concentration Risk [Line Items]
Percentage of concentration risk									10.00%

Repurchase_Agreements_net_Deta1

Repurchase Agreements, net (Details) - Contractual Repricing, Master Repurchase Agreement and Other Information Regarding Repurchase Agreements (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
	agreement	counterparty
	counterparty	agreement
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	$13,881,921	$13,151,504
Weighted Average Contractual Rate	0.38%	0.42%
Number of MRAs	40	35
Number of counterparties with repurchase agreements outstanding	28	27
Weighted average maturity in days	60 days	45 days
Haircut for repurchase agreements	4.81%	4.96%
Maturity up to 30 days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	3,994,656	3,990,434
Weighted Average Contractual Rate	0.36%	0.41%
Maturity 31 to 60 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	5,631,858	7,098,298
Weighted Average Contractual Rate	0.37%	0.41%
Maturity 61 to 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	2,348,839	1,226,694
Weighted Average Contractual Rate	0.39%	0.44%
Maturity over 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	$1,906,568	$836,078
Weighted Average Contractual Rate	0.44%	0.43%

Derivatives_Details_Interest_R

Derivatives (Details) - Interest Rate Swap Contracts, Swaptions and Futures Contracts (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Weighted Average Remaining Swap / Option Term (Months)	63 months	47 months
Weighted Average Rate	1.60%	1.98%
Notional Amount	$13,030,000,000	$16,025,000,000
Asset Fair Value	60,518,000	508,988,000
Liability Fair Value	-137,393,000	-102,795,000
Swap | Interest Rate Swap 0-12 Months
Derivative [Line Items]
Remaining / Underlying Term-Minimum	0 months	0 months
Remaining / Underlying Term-Maximum	12 months	12 months
Weighted Average Remaining Swap / Option Term (Months)	5 months	2 months
Weighted Average Rate	1.13%	1.14%
Notional Amount	920,000,000	200,000,000
Asset Fair Value	0	0
Liability Fair Value	-9,349,000	-2,089,000
Swap | Interest Rate Swap 13-24 Months
Derivative [Line Items]
Remaining / Underlying Term-Minimum	13 months	13 months
Remaining / Underlying Term-Maximum	24 months	24 months
Weighted Average Remaining Swap / Option Term (Months)	16 months	17 months
Weighted Average Rate	1.23%	1.13%
Notional Amount	2,900,000,000	920,000,000
Asset Fair Value	0	0
Liability Fair Value	-54,396,000	-18,095,000
Swap | Interest Rate Swap 25-36 Months
Derivative [Line Items]
Remaining / Underlying Term-Minimum	25 months	25 months
Remaining / Underlying Term-Maximum	36 months	36 months
Weighted Average Remaining Swap / Option Term (Months)	31 months	28 months
Weighted Average Rate	0.63%	1.23%
Notional Amount	350,000,000	2,900,000,000
Asset Fair Value	2,083,000	0
Liability Fair Value	0	-81,108,000
Swap | Interest Rate Swap 37-48 Months
Derivative [Line Items]
Remaining / Underlying Term-Minimum	37 months	37 months
Remaining / Underlying Term-Maximum	48 months	48 months
Weighted Average Remaining Swap / Option Term (Months)	37 months	43 months
Weighted Average Rate	1.00%	0.63%
Notional Amount	300,000,000	350,000,000
Asset Fair Value	2,090,000	2,614,000
Liability Fair Value	0	0
Swap | Interest Rate Swap 49-60 Months
Derivative [Line Items]
Remaining / Underlying Term-Minimum	49 months	49 months
Remaining / Underlying Term-Maximum	60 months	60 months
Weighted Average Remaining Swap / Option Term (Months)	59 months	49 months
Weighted Average Rate	1.56%	1.00%
Notional Amount	2,000,000,000	300,000,000
Asset Fair Value	0	3,817,000
Liability Fair Value	-7,414,000	0
Swap | Interest Rate Swap 61-72 Months
Derivative [Line Items]
Remaining / Underlying Term-Minimum	61 months	61 months
Remaining / Underlying Term-Maximum	72 months	72 months
Weighted Average Remaining Swap / Option Term (Months)	61 months	0 months
Weighted Average Rate	1.48%	0.00%
Notional Amount	300,000,000	0
Asset Fair Value	2,921,000	0
Liability Fair Value	0	0
Swap | Interest Rate Swap 73-84 Months
Derivative [Line Items]
Remaining / Underlying Term-Minimum	73 months	73 months
Remaining / Underlying Term-Maximum	84 months	84 months
Weighted Average Remaining Swap / Option Term (Months)	0 months	73 months
Weighted Average Rate	0.00%	1.48%
Notional Amount	0	300,000,000
Asset Fair Value	0	11,112,000
Liability Fair Value	0	0
Swap | Interest Rate Swap 85-96 Months
Derivative [Line Items]
Remaining / Underlying Term-Minimum	85 months	85 months
Remaining / Underlying Term-Maximum	96 months	96 months
Weighted Average Remaining Swap / Option Term (Months)	91 months	0 months
Weighted Average Rate	1.47%	0.00%
Notional Amount	2,450,000,000	0
Asset Fair Value	50,650,000	0
Liability Fair Value	0	0
Swap | Interest Rate Swap 97-108 Months
Derivative [Line Items]
Remaining / Underlying Term-Minimum	97 months	97 months
Remaining / Underlying Term-Maximum	108 months	108 months
Weighted Average Remaining Swap / Option Term (Months)	98 months	103 months
Weighted Average Rate	2.08%	1.47%
Notional Amount	2,800,000,000	2,450,000,000
Asset Fair Value	2,774,000	195,221,000
Liability Fair Value	-7,534,000	0
Swap | Interest Rate Swap 109-120 Months
Derivative [Line Items]
Remaining / Underlying Term-Minimum	109 months	109 months
Remaining / Underlying Term-Maximum	120 months	120 months
Weighted Average Remaining Swap / Option Term (Months)	0 months	110 months
Weighted Average Rate	0.00%	2.08%
Notional Amount	0	2,800,000,000
Asset Fair Value	0	184,456,000
Liability Fair Value	0	0
Swap | Interest Rate Swap 121-132 Months
Derivative [Line Items]
Remaining / Underlying Term-Minimum	121 months
Remaining / Underlying Term-Maximum	132 months
Weighted Average Remaining Swap / Option Term (Months)	120 months
Weighted Average Rate	2.66%
Notional Amount	1,000,000,000
Asset Fair Value	0
Liability Fair Value	-58,520,000
Swap | Interest Rate Swaptions 60 Months
Derivative [Line Items]
Remaining / Underlying Term-Minimum		60 months
Swap | Interest Rate Swaptions 120 Months
Derivative [Line Items]
Remaining / Underlying Term-Minimum		120 months
Future | Futures Contracts
Derivative [Line Items]
Remaining / Underlying Term-Minimum	0 months	0 months
Remaining / Underlying Term-Maximum	15 months	21 months
Weighted Average Remaining Swap / Option Term (Months)	9 months	13 months
Weighted Average Rate	2.11%	1.97%
Notional Amount	10,000,000	55,000,000
Asset Fair Value	0	0
Liability Fair Value	-180,000	-1,503,000
Swaption | Interest Rate Swaptions 60 Months
Derivative [Line Items]
Weighted Average Remaining Swap / Option Term (Months)		9 months
Weighted Average Rate		2.73%
Notional Amount		4,000,000,000
Asset Fair Value		35,937,000
Liability Fair Value		0
Swaption | Interest Rate Swaptions 120 Months
Derivative [Line Items]
Weighted Average Remaining Swap / Option Term (Months)		6 months
Weighted Average Rate		3.16%
Notional Amount		1,750,000,000
Asset Fair Value		75,831,000
Liability Fair Value		$0

Derivatives_Details_Offsetting

Derivatives (Details) - Offsetting Assets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Offsetting Assets [Line Items]
Gross Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	$60,518	$508,988
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet	60,518	508,988
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Financial Instruments	-137,213	-101,292
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Net Cash Collateral Held	119,561	-313,229
Net Amount	42,866	94,467
Interest rate swap contracts
Offsetting Assets [Line Items]
Gross Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	60,518	397,219
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet	60,518	397,219
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Financial Instruments	-137,213	-101,292
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Net Cash Collateral Held	119,561	-313,229
Net Amount	42,866	-17,302
Interest rate swaptions
Offsetting Assets [Line Items]
Gross Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0	111,769
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet		111,769
Net Amount		$111,769

Derivatives_Details_Offsetting1

Derivatives (Details) - Offsetting Liabilities (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Offsetting Liabilities [Line Items]
Gross Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet	($137,393)	($102,795)
Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet	-137,393	-102,795
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Financial Instruments	137,213	101,292
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Cash Collateral Posted	227	1,599
Net Amount	47	96
Interest rate swap contracts
Offsetting Liabilities [Line Items]
Gross Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet	-137,213	-101,292
Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet	-137,213	-101,292
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Financial Instruments	137,213	101,292
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Cash Collateral Posted	0	0
Net Amount	0	0
Futures Contracts
Offsetting Liabilities [Line Items]
Gross Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet	-180	-1,503
Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet	-180	-1,503
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Cash Collateral Posted	227	1,599
Net Amount	$47	$96

Derivatives_Details_Location_a

Derivatives (Details) - Location and Information of Derivatives (USD $)	3 Months Ended									12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Realized gain (loss)	($37,824)	[1]	($34,655)	($34,498)	($11,739)	($30,735)	($37,262)	($38,858)	($29,053)	($118,716)	[1]	($135,908)	[1]	($63,039)	[1]
Unrealized gain (loss) on derivatives	-184,710		14,708	-116,273	-176,355	127,980	-11,821	412,183	16,301	-462,630		544,643		-58,774
Total										-581,346		408,735		-121,813
Interest rate swap contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total										-511,927		383,594		-99,875
Interest rate swap contracts | Realized loss on derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Realized gain (loss)										0		25,686		0
Interest income										14,213		17,180		8,882
Interest expense										-154,874		-158,465		-69,479
Interest rate swap contracts | Unrealized gain (loss) on derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives										-371,266		499,193		-39,278
Interest rate swaptions
Derivative Instruments, Gain (Loss) [Line Items]
Total										-69,369		25,256		-20,869
Interest rate swaptions | Realized loss on derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Realized gain (loss)										23,318		-17,778		0
Interest rate swaptions | Unrealized gain (loss) on derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives										-92,687		43,034		-20,869
Futures Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total										-50		-115		-1,069
Futures Contracts | Realized loss on derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Realized gain (loss)										-1,373		-2,531		-2,442
Futures Contracts | Unrealized gain (loss) on derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives										$1,323		$2,416		$1,373
[1]	Interest expense related to our interest rate swap contracts is recorded as realized loss on derivatives on the consolidated statements of operations. For additional information, see Note 8 to the consolidated financial statements.

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)	Dec. 31, 2014	Feb. 25, 2014
In Thousands, unless otherwise specified
Other Commitments [Line Items]
Monthly percentage of effective management fee percentage	8.33%
Gross equity raised	2,697,223
ARRM
Other Commitments [Line Items]
Percentage of gross equity raised used in calculation of management fee up to 1 Billion		1.50%
Percentage of gross equity raised used in calculation of management fee in excess of 1 Billion		0.75%
Effective management fee	1.03%

Stock_Based_Compensation_Detai

Stock Based Compensation (Details) (The 2009 Stock Incentive Plan, USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	8-May-14	7-May-14
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized		15,000,000	2,000,000
Compensation cost not yet recognized	$3,883
Share price (in Dollars per share)	$3.68
Period for recognition for compensation cost not yet recognized	1 year 10 months
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards issued upon stockholders' approval of Plan amendment	150,000

Stock_Based_Compensation_Detai1

Stock Based Compensation (Details) - Restricted Shares (The 2009 Stock Incentive Plan, Restricted Stock, USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014
The 2009 Stock Incentive Plan | Restricted Stock
Number of Awards
Unvested Awards Outstanding beginning of period	1,329
Awards issued upon stockholders' approval of Plan amendment	150
Vested	-424
Unvested Awards Outstanding end of period	1,055
Weighted Average Grant Date Fair Value per Award
Unvested Awards Outstanding beginning of period	$6.94
Awards issued upon stockholders' approval of Plan amendment	$3.74
Vested	$7.07
Unvested Awards Outstanding end of period	$6.47

Shareholders_Equity_Details_Di

Shareholders' Equity (Details) - Dividend Transactions (USD $)	0 Months Ended																																																																3 Months Ended								12 Months Ended			0 Months Ended
	Dec. 30, 2014	Dec. 15, 2014	Nov. 26, 2014	Nov. 17, 2014	Oct. 30, 2014	Oct. 15, 2014	Sep. 29, 2014	Sep. 15, 2014	Aug. 29, 2014	Aug. 15, 2014	Jul. 30, 2014	Jul. 15, 2014	Jun. 27, 2014	Jun. 16, 2014	29-May-14	15-May-14	Apr. 29, 2014	Apr. 15, 2014	Mar. 28, 2014	Mar. 17, 2014	Feb. 27, 2014	Feb. 14, 2014	Jan. 30, 2014	Jan. 15, 2014	Dec. 27, 2013	Dec. 16, 2013	Nov. 27, 2013	Nov. 15, 2013	Oct. 28, 2013	Oct. 15, 2013	Sep. 27, 2013	Sep. 16, 2013	Aug. 29, 2013	Aug. 15, 2013	Jul. 30, 2013	Jul. 15, 2013	Jun. 27, 2013	Jun. 14, 2013	30-May-13	15-May-13	Apr. 29, 2013	Apr. 15, 2013	Mar. 27, 2013	Mar. 15, 2013	Feb. 27, 2013	Feb. 15, 2013	Jan. 30, 2013	Jan. 15, 2013	Dec. 28, 2012	Dec. 14, 2012	Nov. 29, 2012	Nov. 15, 2012	Oct. 30, 2012	Oct. 15, 2012	Sep. 27, 2012	Sep. 14, 2012	Aug. 30, 2012	Aug. 15, 2012	Jul. 30, 2012	Jul. 16, 2012	Jun. 28, 2012	Jun. 15, 2012	30-May-12	15-May-12	Apr. 27, 2012	Apr. 16, 2012	Mar. 29, 2012	Mar. 15, 2012	Feb. 28, 2012	Feb. 15, 2012	Jan. 30, 2012	Jan. 15, 2012	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 29, 2014	Nov. 28, 2014	Nov. 15, 2014	Oct. 27, 2014	Aug. 27, 2014	Jul. 28, 2014	Jun. 15, 2014	27-May-14	Apr. 28, 2014	Mar. 27, 2014	Mar. 15, 2014	Feb. 15, 2014	Jan. 27, 2014	Dec. 15, 2013	Sep. 15, 2013	Aug. 27, 2013	Jul. 29, 2013	27-May-13	Mar. 26, 2013	Feb. 26, 2013	Jan. 28, 2013	Dec. 27, 2012	Nov. 27, 2012	Oct. 29, 2012	Aug. 27, 2012	Jul. 27, 2012	Jul. 13, 2012
Class of Stock [Line Items]
Common stock dividends declared per common share (in usd per share)		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.07		$0.07		$0.07		$0.07		$0.07		$0.07		$0.08		$0.08		$0.08		$0.09		$0.09		$0.09		$0.10		$0.10		$0.10		$0.10		$0.10		$0.10		$0.11		$0.11		$0.11	$0.15	$0.15	$0.15	$0.15	$0.15	$0.21	$0.21	$0.24	$0.60	$0.81	$1.20
Common stock dividends cash paid (in dollars per share)	$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.07		$0.07		$0.07		$0.07		$0.07		$0.07		$0.08		$0.08		$0.08		$0.09		$0.09		$0.09		$0.10		$0.10		$0.10		$0.10		$0.10		$0.10		$0.11		$0.11		$0.11
Aggregate amount paid to holders of record (in dollars)	$17,922,000		$17,923,000		$17,923,000		$17,923,000		$17,923,000		$17,923,000		$17,924,000		$17,924,000		$17,925,000		$17,945,000		$17,954,000		$17,954,000		$18,574,000		$18,624,000		$18,624,000		$26,079,000		$26,074,000		$26,074,000		$26,088,000		$26,313,000		$26,313,000		$30,284,000		$24,773,000		$24,772,000		$27,969,000		$27,869,000		$27,868,000		$30,973,000		$29,958,000		$23,498,000		$18,667,000		$18,105,000		$17,840,000		$19,768,000		$15,329,000		$11,659,000										$215,163,000	$292,592,000	$269,503,000
Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock dividends declared (in usd per share)		$0.17				$0.17		$0.17		$0.17		$0.17				$0.17		$0.17						$0.17				$0.17		$0.17				$0.17		$0.17		$0.17		$0.17		$0.17		$0.17		$0.17		$0.17		$0.17		$0.17		$0.17		$0.17		$0.17																												$0.17				$0.17				$0.17	$0.17		$0.17	$0.17												$0.29
Preferred stock dividends cash paid (in dollars per share)							$0.17						$0.17								$0.17				$0.17		$0.17		$0.17		$0.17						$0.17				$0.17														$0.17																													$0.17	$0.17		$0.17	$0.17	$0.17		$0.17	$0.17	$0.17			$0.17			$0.17	$0.17	$0.17	$0.17	$0.17	$0.17	$0.17	$0.17	$0.17	$0.17	$0.29
Aggregate amount paid to holders of record (in dollars)							374,800						374,800								374,800				374,800		374,800		374,800		374,800						374,800				374,800														292,000																										4,497,000	4,480,000	1,964,000	374,800	374,800		374,800	374,800	374,800		374,800	374,800	374,800			374,800			374,800	374,800	374,800	374,800	374,800	357,600	344,600	339,000	315,000	272,000	401,000
Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock dividends declared (in usd per share)		$0.16				$0.16		$0.16		$0.16		$0.16				$0.16		$0.16						$0.16				$0.16		$0.16				$0.16		$0.16		$0.16		$0.16		$0.16		$0.25																																										$0.16				$0.16				$0.16	$0.16		$0.16	$0.16
Preferred stock dividends cash paid (in dollars per share)							$0.16						$0.16								$0.16				$0.16		$0.16		$0.16		$0.16						$0.16				$0.16		$0.25																																									$0.16	$0.16		$0.16	$0.16	$0.16		$0.16	$0.16	$0.16			$0.16			$0.16	$0.16	$0.16
Aggregate amount paid to holders of record (in dollars)							926,900						926,900								926,900				926,900		926,900		926,900		926,900						926,900				926,900		1,391,000																																						11,123,000	9,733,000	0	926,900	926,900		926,900	926,900	926,900		926,900	926,900	926,900			926,900			926,900	926,900	926,900
Dividends Paid for Previous Holding Period | Series A Preferred Stock
Class of Stock [Line Items]
Aggregate amount paid to holders of record (in dollars)																																																																																																													$160,000

Shareholders_Equity_Details_Eq

Shareholders' Equity (Details) - Equity Transactions (USD $)

8 Months Ended

11 Months Ended

12 Months Ended

0 Months Ended

6 Months Ended

1 Months Ended

11 Months Ended

12 Months Ended

8 Months Ended

In Thousands, except Per Share data, unless otherwise specified

Sep. 29, 2014

Dec. 28, 2012

Dec. 31, 2013

Dec. 31, 2012

Feb. 20, 2013

Jun. 07, 2012

Aug. 08, 2012

Jul. 13, 2012

Mar. 14, 2012

Feb. 08, 2012

Jan. 13, 2012

Feb. 29, 2012

Dec. 27, 2012

Jan. 30, 2013

Dec. 27, 2013

Dec. 31, 2014

Sep. 11, 2012

Dividend Reinvestment Plan

Number of shares (in shares)

66

Net Proceeds (in Dollars)

$269

$438,582

$1,498,238

Dividend Reinvestment Plan and Stock Purchase Plan [Abstract]

Number of Shares (in shares)

7,286

Net proceeds (in dollars)

52,888

Series B Preferred Stock

Other Sale of Stock Transactions

Net proceeds (in dollars)

136,553

Series A Preferred Stock

Other Sale of Stock Transactions

Net proceeds (in dollars)

4,380

48,794

Weighted Average

Dividend Reinvestment Plan

Price per share (in usd per share)

$4.12

Dividend Reinvestment Plan and Stock Purchase Plan [Abstract]

Per share price (in usd per share)

$7.28

IPO | Series B Preferred Stock

Other Sale of Stock Transactions

Number of Shares (in shares)

5,650

Per share price (in usd per share)

$25

Net proceeds (in dollars)

136,553

IPO | Series A Preferred Stock

Other Sale of Stock Transactions

Number of Shares (in shares)

1,400

Net proceeds (in dollars)

33,780

IPO | Weighted Average | Series A Preferred Stock

Other Sale of Stock Transactions

Per share price (in usd per share)

$25

Follow-On Public Offering

Other Sale of Stock Transactions

Number of Shares (in shares)

63,250

46,000

35,650

29,900

10,350

Net proceeds (in dollars)

461,435

324,474

239,168

203,033

70,179

Follow-On Public Offering | Weighted Average

Other Sale of Stock Transactions

Per share price (in usd per share)

$7.30

$7.06

$6.72

$6.80

$6.80

Equity Distribution Agreement

Other Sale of Stock Transactions

Number of Shares (in shares)

1,287

606

Net proceeds (in dollars)

8,902

15,014

Equity Distribution Agreement | Series A Preferred Stock

Other Sale of Stock Transactions

Number of Shares (in shares)

175

Per share price (in usd per share)

$25.51

Net proceeds (in dollars)

4,380

Equity Distribution Agreement | Weighted Average

Other Sale of Stock Transactions

Per share price (in usd per share)

$7.06

$25.54

Common Stock

Dividend Reinvestment Plan

Number of shares (in shares)

65,067

213,473

67

66

Net Proceeds (in Dollars)

65

213

0

269

Common Stock | Weighted Average

Dividend Reinvestment Plan

Price per share (in usd per share)

$4.83

Common Stock | Follow-On Public Offering

Other Sale of Stock Transactions

Number of Shares (in shares)

65,000

Per share price (in usd per share)

$6.75

Net proceeds (in dollars)

438,582

Common Stock | Equity Distribution Agreement

Other Sale of Stock Transactions

Number of Shares (in shares)

19,750

Net proceeds (in dollars)

$138,159

Common Stock | Equity Distribution Agreement | Weighted Average

Other Sale of Stock Transactions

Per share price (in usd per share)

$7.14

Shareholders_Equity_Details_Co

Shareholders' Equity (Details) - Common Stock Repurchased (Details) (USD $)	0 Months Ended	1 Months Ended	10 Months Ended	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	17-May-13	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Common stock repurchased (in Shares)	3,396	13,375	4,804
Common stock repurchased (in usd per share)	$5.94	$3.89	$3.82
Repurchase of Common Stock (in Dollars)	$20,259	$52,435	$18,362	$18,362	$72,694

Income_Loss_per_Common_Share_D

Income (Loss) per Common Share (Details) - Reconciliation of Net Income (Loss) and Shares Used in Calculating Basic and Diluted Earnings Per Share (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net Income (Loss)	($143,172)	$54,092	($70,190)	($19,778)	($540,776)	($229,943)	$481,385	$102,290	($179,048)	($187,044)	$222,306
Less: Preferred dividends	-3,905	-3,905	-3,905	-3,905	-3,906	-3,905	-3,905	-2,497	-15,620	-14,213	-1,964
Net Income (Loss) available (related) to common stockholders	($147,077)	$50,187	($74,095)	($23,683)	($544,682)	($233,848)	$477,480	$99,793	($194,668)	($201,257)	$220,342
Weighted average common shares outstanding – basic	357,134	357,196	357,111	357,496	369,543	370,818	372,591	337,935	357,233	362,830	223,627
Add: Effect of dilutive non-vested awards, assumed vested									0	0	636
Weighted average common shares outstanding – diluted	357,134	358,357	357,111	357,496	369,543	372,256	374,135	339,722	357,233	362,830	224,263

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended									12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Tax Credit Carryforward [Line Items]
Aggregate tax basis of stockholders' equity in excess of assets and liabilities	$91,976									$91,976
Aggregate tax basis of stockholders' equity in excess of assets and liabilities (dollars per share)	$0.26									$0.26
Common Stock, Shares, Issued	353,159					357,613				353,159		357,613
Common stock, shares outstanding (in Shares)	353,159					357,613				353,159		357,613
Payment of dividends										230,783		306,805		271,467
Estimated REIT Taxable Income										199,420		240,448		281,174
Realized gain (loss)	-37,824	[1]	-34,655	-34,498	-11,739	-30,735	-37,262	-38,858	-29,053	-118,716	[1]	-135,908	[1]	-63,039	[1]
Capital Loss Carryforward
Tax Credit Carryforward [Line Items]
Tax credit carryforward	-341,850					-579,322				-341,850		-579,322
Interest rate swaptions
Tax Credit Carryforward [Line Items]
Amortization period for tax purposes on unrealized losses on derivatives										10 years
Interest rate swaptions | Realized loss on derivatives
Tax Credit Carryforward [Line Items]
Realized gain (loss)										23,318		-17,778		0
Interest rate swap contracts | Realized loss on derivatives
Tax Credit Carryforward [Line Items]
Realized gain (loss)										$0		$25,686		$0
[1]	Interest expense related to our interest rate swap contracts is recorded as realized loss on derivatives on the consolidated statements of operations. For additional information, see Note 8 to the consolidated financial statements.

Income_Taxes_Details_Reconcili

Income Taxes (Details) - Reconciliation of GAAP Net Income to Estimated REIT Taxable Income (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
GAAP net income (loss)	($143,172)	$54,092	($70,190)	($19,778)	($540,776)	($229,943)	$481,385	$102,290	($179,048)	($187,044)	$222,306
Book to tax differences:
Changes in interest rate contracts									439,312	-551,359	58,774
(Gains) Losses on Security Sales									-54,082	579,322	0
Other than temporary loss on Agency Securities									0	401,541	0
Amortization of deferred hedging costs									-1,174	-2,030	0
Net premium amortization differences									-5,609	0	0
Other									21	18	94
Estimated taxable income									$199,420	$240,448	$281,174

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Management fee	$27,857,000	$28,141,000	$19,459,000
Lump sum cash payment option	33,559,000
ARRM
Related Party Transaction [Line Items]
Automatic renewal period of management agreement	5 years
Period of written notice of termination	180 days
Management fee	27,857,000	28,141,000	19,459,000
ARRM | Other Expense
Related Party Transaction [Line Items]
Management fee	2,204,000	1,550,000	52,000
ARRM | Stock Based Compensation Expense
Related Party Transaction [Line Items]
Management fee	$900,000	$1,097,000	$0
Armour Capital Management LP | Sub-Manager | Sub-Management Agreement
Related Party Transaction [Line Items]
Fee payable percent of monthly management fee earned	25.00%

Subsequent_Events_Details

Subsequent Events (Details) (USD $)	0 Months Ended																																																																3 Months Ended								12 Months Ended			0 Months Ended
	Dec. 30, 2014	Dec. 15, 2014	Nov. 26, 2014	Nov. 17, 2014	Oct. 30, 2014	Oct. 15, 2014	Sep. 29, 2014	Sep. 15, 2014	Aug. 29, 2014	Aug. 15, 2014	Jul. 30, 2014	Jul. 15, 2014	Jun. 27, 2014	Jun. 16, 2014	29-May-14	15-May-14	Apr. 29, 2014	Apr. 15, 2014	Mar. 28, 2014	Mar. 17, 2014	Feb. 27, 2014	Feb. 14, 2014	Jan. 30, 2014	Jan. 15, 2014	Dec. 27, 2013	Dec. 16, 2013	Nov. 27, 2013	Nov. 15, 2013	Oct. 28, 2013	Oct. 15, 2013	Sep. 27, 2013	Sep. 16, 2013	Aug. 29, 2013	Aug. 15, 2013	Jul. 30, 2013	Jul. 15, 2013	Jun. 27, 2013	Jun. 14, 2013	30-May-13	15-May-13	Apr. 29, 2013	Apr. 15, 2013	Mar. 27, 2013	Mar. 15, 2013	Feb. 27, 2013	Feb. 15, 2013	Jan. 30, 2013	Jan. 15, 2013	Dec. 28, 2012	Dec. 14, 2012	Nov. 29, 2012	Nov. 15, 2012	Oct. 30, 2012	Oct. 15, 2012	Sep. 27, 2012	Sep. 14, 2012	Aug. 30, 2012	Aug. 15, 2012	Jul. 30, 2012	Jul. 16, 2012	Jun. 28, 2012	Jun. 15, 2012	30-May-12	15-May-12	Apr. 27, 2012	Apr. 16, 2012	Mar. 29, 2012	Mar. 15, 2012	Feb. 28, 2012	Feb. 15, 2012	Jan. 30, 2012	Jan. 15, 2012	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 27, 2015	Dec. 29, 2014	Nov. 28, 2014	Oct. 27, 2014	Aug. 27, 2014	Jul. 28, 2014	27-May-14	Apr. 28, 2014	Mar. 27, 2014	Jan. 27, 2014	Aug. 27, 2013	Jul. 29, 2013	27-May-13	Mar. 26, 2013	Feb. 26, 2013	Jan. 28, 2013	Dec. 27, 2012	Nov. 27, 2012	Oct. 29, 2012	Aug. 27, 2012	Jul. 27, 2012
Subsequent Event [Line Items]
Common stock dividends cash paid (in dollars per share)	$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.07		$0.07		$0.07		$0.07		$0.07		$0.07		$0.08		$0.08		$0.08		$0.09		$0.09		$0.09		$0.10		$0.10		$0.10		$0.10		$0.10		$0.10		$0.11		$0.11		$0.11
Aggregate amount paid to holders of record (in dollars)	$17,922,000		$17,923,000		$17,923,000		$17,923,000		$17,923,000		$17,923,000		$17,924,000		$17,924,000		$17,925,000		$17,945,000		$17,954,000		$17,954,000		$18,574,000		$18,624,000		$18,624,000		$26,079,000		$26,074,000		$26,074,000		$26,088,000		$26,313,000		$26,313,000		$30,284,000		$24,773,000		$24,772,000		$27,969,000		$27,869,000		$27,868,000		$30,973,000		$29,958,000		$23,498,000		$18,667,000		$18,105,000		$17,840,000		$19,768,000		$15,329,000		$11,659,000										$215,163,000	$292,592,000	$269,503,000
Dividends declared per common share (in usd per share)		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.05		$0.07		$0.07		$0.07		$0.07		$0.07		$0.07		$0.08		$0.08		$0.08		$0.09		$0.09		$0.09		$0.10		$0.10		$0.10		$0.10		$0.10		$0.10		$0.11		$0.11		$0.11	$0.15	$0.15	$0.15	$0.15	$0.15	$0.21	$0.21	$0.24	$0.60	$0.81	$1.20
Subsequent Event
Subsequent Event [Line Items]
Common stock dividends cash paid (in dollars per share)																																																																																				$0.04
Aggregate amount paid to holders of record (in dollars)																																																																																				14,126,000
Dividends declared per common share (in usd per share)																																																																																				$0.04
Series A Preferred Stock
Subsequent Event [Line Items]
Preferred stock dividends cash paid (in dollars per share)							$0.17						$0.17								$0.17				$0.17		$0.17		$0.17		$0.17						$0.17				$0.17														$0.17																														$0.17	$0.17	$0.17	$0.17	$0.17	$0.17	$0.17	$0.17	$0.17	$0.17	$0.17	$0.17	$0.17	$0.17	$0.17	$0.17	$0.17	$0.17	$0.17	$0.29
Aggregate amount paid to holders of record (in dollars)							374,800						374,800								374,800				374,800		374,800		374,800		374,800						374,800				374,800														292,000																										4,497,000	4,480,000	1,964,000		374,800	374,800	374,800	374,800	374,800	374,800	374,800	374,800	374,800	374,800	374,800	374,800	374,800	374,800	357,600	344,600	339,000	315,000	272,000	401,000
Series A Preferred Stock | Subsequent Event
Subsequent Event [Line Items]
Preferred stock dividends cash paid (in dollars per share)																																																																																				$0.17
Aggregate amount paid to holders of record (in dollars)																																																																																				375,000
Preferred Stock, Dividends Per Share, Declared																																																																																				$0.17
Series B Preferred Stock
Subsequent Event [Line Items]
Preferred stock dividends cash paid (in dollars per share)							$0.16						$0.16								$0.16				$0.16		$0.16		$0.16		$0.16						$0.16				$0.16		$0.25																																										$0.16	$0.16	$0.16	$0.16	$0.16	$0.16	$0.16	$0.16	$0.16	$0.16	$0.16	$0.16
Aggregate amount paid to holders of record (in dollars)							926,900						926,900								926,900				926,900		926,900		926,900		926,900						926,900				926,900		1,391,000																																						11,123,000	9,733,000	0		926,900	926,900	926,900	926,900	926,900	926,900	926,900	926,900	926,900	926,900	926,900	926,900
Series B Preferred Stock | Subsequent Event
Subsequent Event [Line Items]
Preferred stock dividends cash paid (in dollars per share)																																																																																				$0.16
Aggregate amount paid to holders of record (in dollars)																																																																																				$927,000
Preferred Stock, Dividends Per Share, Declared																																																																																				$0.16

Quarterly_Financial_Data_unaud2

Quarterly Financial Data (unaudited) (Details) (USD $)	0 Months Ended																																				3 Months Ended									12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 15, 2014	Nov. 17, 2014	Oct. 15, 2014	Sep. 15, 2014	Aug. 15, 2014	Jul. 15, 2014	Jun. 16, 2014	15-May-14	Apr. 15, 2014	Mar. 17, 2014	Feb. 14, 2014	Jan. 15, 2014	Dec. 16, 2013	Nov. 15, 2013	Oct. 15, 2013	Sep. 16, 2013	Aug. 15, 2013	Jul. 15, 2013	Jun. 14, 2013	15-May-13	Apr. 15, 2013	Mar. 15, 2013	Feb. 15, 2013	Jan. 15, 2013	Dec. 14, 2012	Nov. 15, 2012	Oct. 15, 2012	Sep. 14, 2012	Aug. 15, 2012	Jul. 16, 2012	Jun. 15, 2012	15-May-12	Apr. 16, 2012	Mar. 15, 2012	Feb. 15, 2012	Jan. 15, 2012	Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Interest income, net of premium amortization																																					$106,472		$107,481	$113,892	$123,082	$121,229	$112,418	$141,159	$130,637	$450,927		$505,443		$388,994
Interest expense- repurchase agreements																																					-14,830		-15,006	-14,979	-14,747	-16,249	-17,811	-23,578	-25,475	-59,562		-83,113		-61,195
Interest expense- U.S. Treasury Securities sold short																																					-1,128		-160	-4,263	0	0	-1,420	-17	0	-5,551		-1,437		0
Net Interest Income																																					90,514		92,315	94,650	108,335	104,980	93,187	117,564	105,162	385,814		420,893		327,799
Realized gain (loss) on sale of Agency Securities (reclassified from Other comprehensive income (loss))																																					124		-12,390	11,167	69,869	-331,929	-300,960	20,876	18,514	68,770		-593,498		40,627
Other than temporary impairment of Agency Securities (reclassified from Other comprehensive income (loss))																																										-401,541	0	0	0	0		-401,541		0
Gain (loss) on short sale of U.S. Treasury Securities																																					-1,993		3,086	-15,781	0	0	36,587	-21,078	0	-14,688		15,508		0
Realized loss on derivatives																																					-37,824	[1]	-34,655	-34,498	-11,739	-30,735	-37,262	-38,858	-29,053	-118,716	[1]	-135,908	[1]	-63,039	[1]
Unrealized gain (loss) on derivatives																																					-184,710		14,708	-116,273	-176,355	127,980	-11,821	412,183	16,301	-462,630		544,643		-58,774
Expenses																																					-9,283		-8,972	-9,455	-9,888	-9,531	-9,684	-9,302	-8,634	-37,598		-37,151		-25,374
Income tax benefit (expense)																																					0		0	0	0	0	10	0	0	0		10		24
Net Income (Loss)																																					-143,172		54,092	-70,190	-19,778	-540,776	-229,943	481,385	102,290	-179,048		-187,044		222,306
Dividends declared on preferred stock																																					-3,905		-3,905	-3,905	-3,905	-3,906	-3,905	-3,905	-2,497	-15,620		-14,213		-1,964
Net Income (Loss) available (related) to common stockholders																																					($147,077)		$50,187	($74,095)	($23,683)	($544,682)	($233,848)	$477,480	$99,793	($194,668)		($201,257)		$220,342
Basic (in usd per share)																																					($0.41)		$0.14	($0.21)	($0.07)	($1.47)	($0.63)	$1.28	$0.30	($0.54)		($0.55)		$0.99
Diluted (in usd per share)																																					($0.41)		$0.14	($0.21)	($0.07)	($1.47)	($0.63)	$1.28	$0.29	($0.54)		($0.55)		$0.98
Dividends declared per common share (in usd per share)	$0.05	$0.05	$0.05	$0.05	$0.05	$0.05	$0.05	$0.05	$0.05	$0.05	$0.05	$0.05	$0.05	$0.05	$0.05	$0.07	$0.07	$0.07	$0.07	$0.07	$0.07	$0.08	$0.08	$0.08	$0.09	$0.09	$0.09	$0.10	$0.10	$0.10	$0.10	$0.10	$0.10	$0.11	$0.11	$0.11	$0.15		$0.15	$0.15	$0.15	$0.15	$0.21	$0.21	$0.24	$0.60		$0.81		$1.20
Basic (in shares)																																					357,134		357,196	357,111	357,496	369,543	370,818	372,591	337,935	357,233		362,830		223,627
Diluted (in shares)																																					357,134		358,357	357,111	357,496	369,543	372,256	374,135	339,722	357,233		362,830		224,263
[1]	Interest expense related to our interest rate swap contracts is recorded as realized loss on derivatives on the consolidated statements of operations. For additional information, see Note 8 to the consolidated financial statements.