10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2017

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from              to             

Commission File Number: 001-34374

ARLINGTON ASSET INVESTMENT CORP.

(Exact name of Registrant as specified in its charter)

Virginia	54-1873198
(State or Other Jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification No.)

1001 Nineteenth Street North Arlington, VA	22209
(Address of Principal Executive Offices)	(Zip Code)

(703) 373-0200

(Registrant’s Telephone Number, Including Area Code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (Sec. 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☐	Accelerated filer	☒
Non-accelerated filer	☐  (Do not check if a small reporting company)	Small reporting company	☐
Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act):Yes ☐ No ☒

Number of shares outstanding of each of the registrant’s classes of common stock, as of October 31, 2017:

Title	Outstanding
Class A Common Stock	28,140,721 shares

ARLINGTON ASSET INVESTMENT CORP.

FORM 10-Q

FOR THE QUARTER ENDED SEPTEMBER 30, 2017

INDEX

			Page
PART I — FINANCIAL INFORMATION
	Item 1.	Consolidated Financial Statements and Notes — (unaudited)	1
		Consolidated Balance Sheets — September 30, 2017 and December 31, 2016	1
		Consolidated Statements of Comprehensive Income — Three and Nine Months Ended September 30, 2017 and 2016	2
		Consolidated Statements of Changes in Equity — Nine Months Ended September 30, 2017 and Year Ended December 31, 2016	3
		Consolidated Statements of Cash Flows — Nine Months Ended September 30, 2017 and 2016	4
		Notes to Consolidated Financial Statements	5
	Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	30
	Item 3.	Quantitative and Qualitative Disclosures about Market Risk	48
	Item 4.	Controls and Procedures	52
PART II — OTHER INFORMATION
	Item 1.	Legal Proceedings	53
	Item 1A.	Risk Factors	53
	Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	53
	Item 3.	Defaults Upon Senior Securities	53
	Item 4.	Mine Safety Disclosures	53
	Item 5.	Other Information	53
	Item 6.	Exhibits	53
		Signatures	56

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PART I

FINANCIAL INFORMATION

Item 1. Financial Statements

ARLINGTON ASSET INVESTMENT CORP.

CONSOLIDATED BALANCE SHEETS

(Dollars in thousands)

(Unaudited)

	September 30, 2017			December 31, 2016
ASSETS
Cash and cash equivalents	$	26,368		$	54,794
Interest receivable		12,428			11,646
Sold securities receivable		92,882			—
Mortgage-backed securities, at fair value
Agency		3,994,515			3,911,375
Private-label		54			1,266
Derivative assets, at fair value		4,177			74,889
Deferred tax assets, net		23,453			48,829
Deposits, net		59,317			11,149
Other assets		2,405			3,003
Total assets	$	4,215,599		$	4,116,951
LIABILITIES AND STOCKHOLDERS’ EQUITY
Liabilities:
Repurchase agreements	$	3,694,838		$	3,649,102
Interest payable		2,813			3,434
Accrued compensation and benefits		4,210			5,406
Dividend payable		17,044			15,739
Derivative liabilities, at fair value		7,146			9,554
Purchased securities payable		21,962			—
Other liabilities		1,190			1,247
Long-term unsecured debt		73,824			73,656
Total liabilities		3,823,027			3,758,138
Commitments and contingencies
Stockholders’ Equity:
Preferred stock, $0.01 par value, 25,000,000 shares authorized, 294,993 and -0- shares    issued and outstanding, respectively (liquidation preference of $7,375 and $-0-,    respectively)		6,904			—
Class A common stock, $0.01 par value, 450,000,000 shares authorized, 28,038,275    and 23,607,111 shares issued and outstanding, respectively		280			236
Class B common stock, $0.01 par value, 100,000,000 shares authorized, -0- and    20,256 shares issued and outstanding, respectively		—			—
Additional paid-in capital		1,972,463			1,910,284
Accumulated deficit		(1,587,075	)		(1,551,707	)
Total stockholders’ equity		392,572			358,813
Total liabilities and stockholders’ equity	$	4,215,599		$	4,116,951

See notes to consolidated financial statements.

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ARLINGTON ASSET INVESTMENT CORP.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Dollars in thousands, except per share data)

(Unaudited)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Interest income
Agency mortgage-backed securities	$	28,771		$	23,917		$	90,454		$	72,980
Private-label mortgage-backed securities		2			1,655			82			7,437
Other		62			82			103			342
Total interest income		28,835			25,654			90,639			80,759
Interest expense
Short-term secured debt		12,748			6,193			32,921			17,202
Long-term unsecured debt		1,220			1,197			3,641			3,584
Total interest expense		13,968			7,390			36,562			20,786
Net interest income		14,867			18,264			54,077			59,973
Investment gain (loss), net
Gain on trading investments, net		13,996			2,468			25,632			81,083
(Loss) gain from derivative instruments, net		(572	)		15,196			(29,945	)		(119,945	)
Realized gain on sale of available-for-sale investments,   net		—			2,439			—			1,846
Other-than-temporary impairment charges		—			—			—			(1,737	)
Other, net		(56	)		619			(51	)		638
Total investment gain (loss), net		13,368			20,722			(4,364	)		(38,115	)
General and administrative expenses
Compensation and benefits		3,449			3,430			9,698			8,750
Other general and administrative expenses		1,095			1,200			3,925			7,887
Total general and administrative expenses		4,544			4,630			13,623			16,637
Income before income taxes		23,691			34,356			36,090			5,221
Income tax provision		823			15,543			25,896			5,132
Net income		22,868			18,813			10,194			89
Dividend on preferred stock		(83	)		—			(118	)		—
Net income available to common stock	$	22,785		$	18,813		$	10,076		$	89
Basic earnings per common share	$	0.86		$	0.82		$	0.41		$	—
Diluted earnings per common share	$	0.85		$	0.81		$	0.40		$	—
Weighted-average common shares outstanding (in   thousands)
Basic		26,377			23,038			24,793			23,011
Diluted		26,856			23,349			25,143			23,154
Other comprehensive income (loss), net of taxes
Unrealized losses on available-for-sale securities (net of     taxes of $-0-, $(141), $-0- and $(3,946), respectively)	$	—		$	(221	)	$	—		$	(6,197	)
Reclassification
Included in investment gain (loss), net, related to sales    of available-for-sale securities (net of taxes of $-0-,    $(639), $-0-, and $(783), respectively)		—			(2,324	)		—			(2,550	)
Included in investment gain (loss), net, related to    other-than-temporary impairment charges on    available-for-sale securities (net of taxes of    $-0-, $-0-, $-0- and $676, respectively)		—			—			—			1,061
Comprehensive income (loss)	$	22,868		$	16,268		$	10,194		$	(7,597	)

See notes to consolidated financial statements.

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ARLINGTON ASSET INVESTMENT CORP.

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY

(Dollars in thousands)

(Unaudited)

	Preferred Stock (#)		Preferred Amount ($)		Class A Common Stock (#)			Class A Amount ($)		Class B Common Stock (#)			Class B Amount ($)			Additional Paid-In Capital			Accumulated Other Comprehensive Income			Accumulated Deficit			Total
Balances, December 31, 2015		—	$	—		22,874,819		$	229		102,216		$	1		$	1,898,085		$	12,371		$	(1,451,258	)	$	459,428
Net loss		—		—		—			—		—			—			—			—			(41,347	)		(41,347	)
Conversion of Class B common stock to   Class A common stock		—		—		81,960			1		(81,960	)		(1	)		—			—			—			—
Issuance of Class A common stock		—		—		595,342			6		—			—			9,669			—			—			9,675
Issuance of Class A common stock under   stock-based compensation plans		—		—		73,457			—		—			—			—			—			—			—
Repurchase of Class A common stock   under stock-based compensation plans		—		—		(18,467	)		—		—			—			(269	)		—			—			(269	)
Stock-based compensation		—		—		—			—		—			—			2,974			—			—			2,974
Income tax provision from stock-based   compensation		—		—		—			—		—			—			(175	)		—			—			(175	)
Other comprehensive loss		—		—		—			—		—			—			—			(12,371	)		—			(12,371	)
Dividends declared		—		—		—			—		—			—			—			—			(59,102	)		(59,102	)
Balances, December 31, 2016		—		—		23,607,111			236		20,256			—			1,910,284			—			(1,551,707	)		358,813
Net income		—		—		—			—		—			—			—			—			10,194			10,194
Conversion of Class B common stock to   Class A common stock		—		—		20,256			—		(20,256	)		—			—			—			—			—
Issuance of Class A common stock		—		—		4,369,637			44		—			—			59,869			—			—			59,913
Issuance of Class A common stock under   stock-based compensation plans		—		—		74,000			—		—			—			—			—			—			—
Issuance of Series B preferred stock		294,993		6,904		—			—		—			—			—			—			—			6,904
Repurchase of Class A common stock   under stock-based compensation plans		—		—		(32,729	)		—		—			—			(437	)		—			—			(437	)
Stock-based compensation		—		—		—			—		—			—			2,747			—			—			2,747
Dividends declared		—		—		—			—		—			—			—			—			(45,562	)		(45,562	)
Balances, September 30, 2017		294,993	$	6,904		28,038,275		$	280	$	—		$	—		$	1,972,463		$	—		$	(1,587,075	)	$	392,572

See notes to consolidated financial statements.

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ARLINGTON ASSET INVESTMENT CORP.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Dollars in thousands)

(Unaudited)

	Nine Months Ended September 30,
	2017			2016
Cash flows from operating activities:
Net income	$	10,194		$	89
Adjustments to reconcile net income to net cash provided by operating activities
Investment loss, net		4,364			38,115
Net premium amortization on mortgage-backed securities		24,767			19,647
Deferred tax provision		25,376			4,692
Other		2,314			1,913
Changes in operating assets
Interest receivable		(782	)		1,253
Other assets		412			2,246
Changes in operating liabilities
Interest payable and other liabilities		(506	)		(2,786	)
Accrued compensation and benefits		(1,196	)		(855	)
Net cash provided by operating activities		64,943			64,314
Cash flows from investing activities:
Purchases of private-label mortgage-backed securities		—			(5,357	)
Purchases of agency mortgage-backed securities		(2,140,604	)		(2,051,425	)
Proceeds from sales of private-label mortgage-backed securities		1,268			106,052
Proceeds from sales of agency mortgage-backed securities		1,629,698			1,950,728
Receipt of principal payments on private-label mortgage-backed securities		14			490
Receipt of principal payments on agency mortgage-backed securities		357,643			351,871
Payments for derivatives and deposits, net		(9,809	)		(138,402	)
Other		129			15,891
Net cash (used in) provided by investing activities		(161,661	)		229,848
Cash flows from financing activities:
Proceeds from repurchase agreements, net		45,736			542,118
Repayments of Federal Home Loan Bank advances		—			(786,900	)
Proceeds from issuance of common stock		59,913			—
Proceeds from issuance of preferred stock		6,904			—
Excess tax benefits associated with stock-based awards		—			(243	)
Dividends paid		(44,261	)		(43,363	)
Net cash provided by (used in) financing activities		68,292			(288,388	)
Net (decrease) increase in cash and cash equivalents		(28,426	)		5,774
Cash and cash equivalents, beginning of period		54,794			36,987
Cash and cash equivalents, end of period	$	26,368		$	42,761
Supplemental cash flow information:
Cash payments for interest	$	37,015		$	21,605
Cash payments for taxes	$	—		$	205
Non-cash investing activity:
Receipt of non-public equity securities upon dissolution of investee fund	$	—		$	619

See notes to consolidated financial statements.

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ARLINGTON ASSET INVESTMENT CORP.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands, except per share data)

(Unaudited)

Note 1. Organization and Basis of Presentation

Arlington Asset Investment Corp. (“Arlington Asset”) and its consolidated subsidiaries (unless the context otherwise provides, collectively, the “Company”) is an investment firm that acquires and holds residential mortgage-related assets, primarily comprised of residential mortgage-backed securities (“MBS”). The Company’s investments in residential MBS include (i) residential mortgage pass-through certificates for which the principal and interest payments are guaranteed by a government-sponsored enterprise (“GSE”) such as the Federal National Mortgage Association (“Fannie Mae”) or the Federal Home Loan Mortgage Corporation (“Freddie Mac”), which are collectively referred to as “agency MBS,” and (ii) residential MBS issued by private institutions for which the principal and interest payments are not guaranteed by a GSE, which are referred to as “private-label MBS” or “non-agency MBS.”

The unaudited interim consolidated financial statements are prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and pursuant to the requirements for reporting on Form 10-Q and Article 10 of Regulation S-X. The Company’s unaudited interim consolidated financial statements and notes thereto should be read in conjunction with the Company’s audited annual consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016.  

The Company’s consolidated financial statements include the accounts of Arlington Asset and all other entities in which the Company has a controlling financial interest. All intercompany accounts and transactions have been eliminated in consolidation.

The preparation of financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect amounts reported in the consolidated financial statements. Although the Company bases these estimates and assumptions on historical experience and all other reasonably available information that the Company believes to be relevant under the circumstances, such estimates frequently require management to exercise significant subjective judgment about matters that are inherently uncertain. Actual results may differ from these estimates.

Certain amounts in the consolidated financial statements and notes for prior periods have been reclassified to conform to the current year’s presentation. These reclassifications had no impact on the previously reported net income, other comprehensive income, total assets or total liabilities.

Note 2. Summary of Significant Accounting Policies

Cash Equivalents

Cash equivalents include demand deposits with banks, money market accounts and highly liquid investments with original maturities of three months or less. As of September 30, 2017 and December 31, 2016, approximately 98% and 99%, respectively, of the Company’s cash equivalents were invested in money market funds that invest primarily in U.S. Treasuries and other securities backed by the U.S. government.

Investment Security Purchases and Sales

Purchases and sales of investment securities are recorded on the settlement date of the transfer unless the trade qualifies as a “regular-way” trade and the associated commitment qualifies for an exemption from the accounting guidance applicable to derivative instruments. A regular-way trade is an investment security purchase or sale transaction that is expected to settle within the period of time following the trade date that is prevalent or traditional for that specific type of security. Any amounts payable or receivable for unsettled security trades are recorded as “sold securities receivable” or “purchased securities payable” in the consolidated balance sheets.

Interest Income Recognition for Investments in Agency MBS

The Company recognizes interest income for its investments in agency MBS by applying the “interest method” permitted by GAAP, whereby purchase premiums and discounts are amortized and accreted, respectively, as an adjustment to contractual interest income accrued at each security’s stated coupon rate. The interest method is applied at the individual security level based upon each security’s effective interest rate. The Company calculates each security’s effective interest rate at the time of purchase by solving for

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the discount rate that equates the present value of that security's remaining contractual cash flows (assuming no principal prepayments) to its purchase price. Because each security’s effective interest rate does not reflect an estimate of future prepayments, the Company refers to this manner of applying the interest method as the “contractual effective interest method.” When applying the contractual effective interest method to its investments in agency MBS, as principal prepayments occur, a proportional amount of the unamortized premium or discount is recognized in interest income such that the effective interest rate on the remaining security balance is unaffected.

Interest Income Recognition for Investments in Private-Label MBS

The Company’s investments in private-label MBS were generally acquired at significant discounts to their par values due in large part to an expectation that the Company will be unable to collect all of the contractual cash flows of the securities. Investments in private-label MBS acquired prior to 2015 were classified as available-for-sale, all of which had been sold as of December 31, 2016. The Company has elected to classify its investments in private-label MBS acquired in 2015 or later as trading securities. Interest income from investments in private-label MBS is recognized using a prospective level-yield methodology which is based upon each security’s effective interest rate. The amount of periodic interest income recognized is determined by applying the security’s effective interest rate to its amortized cost basis or reference amount. At the time of acquisition, the security’s effective interest rate is calculated by solving for the single discount rate that equates the present value of the Company’s best estimate of the amount and timing of the cash flows expected to be collected from the security to its purchase price. To prepare its best estimate of cash flows expected to be collected, the Company develops a number of assumptions about the future performance of the pool of mortgage loans that serve as collateral for its investment, including assumptions about the timing and amount of prepayments and credit losses.

In each subsequent quarterly reporting period, the amount and timing of cash flows expected to be collected from the security are re-estimated based upon current information and events. The following table provides a description of how periodic changes in the estimate of cash flows expected to be collected affect interest income recognition prospectively for investments in private-label MBS that are classified as available-for-sale and trading securities, respectively:

	Effect on Interest Income Recognition for Investments in Private-Label MBS Classified as:
Scenario:	Available-for-Sale	Trading
A positive change in cash flows occurs. Actual cash flows exceed prior estimates and/or a positive change occurs in the estimate of expected remaining cash flows.	If the positive change in cash flows is deemed significant, a revised effective interest rate is calculated and applied prospectively such that the positive change is recognized as incremental interest income over the remaining life of the security. This revised effective interest rate is also used in subsequent periods to determine if any declines in the fair value of that security are other-than-temporary.	A revised effective interest rate is calculated and applied prospectively such that the positive change in cash flows is recognized as incremental interest income over the remaining life of the security.
An adverse change in cash flows occurs. Actual cash flows fall short of prior estimates and/or an adverse change occurs in the estimate of expected remaining cash flows.	The security’s effective interest rate is unaffected. If an adverse change in cash flows occurs for a security that is impaired (that is, its fair value is less than its amortized cost basis), the impairment is considered other-than-temporary due to the occurrence of a credit loss. If a credit loss occurs, the Company writes-down the amortized cost basis of the security to an amount equal to the present value of cash flows expected to be collected, discounted at the security’s existing effective interest rate, and recognizes a corresponding other-than-temporary impairment charge in earnings as a component of “investment gain (loss), net.”	The amount of periodic interest income recognized over the remaining life of the security will be reduced accordingly. Specifically, if an adverse change in cash flows occurs for a security that is impaired (that is, its fair value is less than its reference amount), the reference amount to which the security’s existing effective interest rate will be prospectively applied will be reduced to the present value of cash flows expected to be collected, discounted at the security’s existing effective interest rate. If an adverse change in cash flows occurs for a security that is not impaired, the security’s effective interest rate will be reduced accordingly and applied on a prospective basis.

Other Comprehensive Income

Comprehensive income includes net income as currently reported by the Company on the consolidated statements of comprehensive income adjusted for other comprehensive income. Other comprehensive income for the Company represents periodic unrealized holding gains and losses related to the Company’s investments in MBS classified as available-for-sale. Accumulated unrealized holding gains and losses for available-for-sale MBS are reclassified into net income as a component of “investment gain

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(loss), net” upon (i) sale or realization, or (ii) the occurrence of an other-than-temporary impairment. As of December 31, 2016 all of the Company’s investments in MBS are classified as trading securities. Accordingly, all unrealized gains and losses related to the Company’s investments in MBS during 2017 have been recognized in net income.

Other Significant Accounting Policies

Certain of the Company’s other significant accounting policies are summarized in the following notes:

Investments in agency MBS, subsequent measurement	Note 3
Investments in private-label MBS, subsequent measurement	Note 4
Borrowings	Note 5
To-be-announced agency MBS transactions, including “dollar rolls”	Note 6
Derivative instruments	Note 6
Balance sheet offsetting	Note 7
Fair value measurements	Note 8

Refer to the Company’s 2016 Annual Report on Form 10-K for a complete inventory and summary of the Company’s significant accounting policies.

Recent Accounting Pronouncements

The following table provides a brief description of recently issued accounting pronouncements and their actual or expected effect on the Company’s consolidated financial statements:

Standard	Description	Date of Adoption	Effect on the Consolidated Financial Statements
Recently Adopted Accounting Guidance
ASU No. 2016-07, Simplifying the Transition to the Equity Method of Accounting (Topic 323)	This amendment eliminates the requirement that when an investment qualifies for use of the equity method as a result of an increase in the level of ownership interest or degree of influence, an investor must adjust the investment, results of operations, and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods that the investment had been held.	January 1, 2017	The adoption of ASU No. 2016-07 did not impact the Company’s consolidated financial statements.
ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting (Topic 718)	This amendment was issued with the objective of simplifying several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. Some of the areas for simplification apply only to nonpublic entities.	January 1, 2017	The adoption of ASU No. 2016-07 did not have a material impact on the Company’s consolidated financial statements.
Recently Issued Accounting Guidance Not Yet Adopted
ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date	This amendment defers the effective date of ASU No. 2014-09 for all entities by one year. ASU No. 2014-09 requires entities to recognize revenue to depict the transfer of promised goods or services to customers in amounts that reflect the consideration to which the entity expects to be entitled in exchange for those goods or services. Revenue recognition with respect to financial instruments is not within the scope of ASU No. 2014-09.	January 1, 2018	The Company does not expect that the adoption of ASU No. 2015-14 will have a material impact on its consolidated financial statements.

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Standard	Description	Date of Adoption	Effect on the Consolidated Financial Statements
ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (Subtopic 825-10)	This amendment makes targeted changes to certain aspects of guidance applicable to financial assets and financial liabilities. The amendment primarily affects accounting for certain equity investments, financial liabilities measured under the fair value option, and certain financial instrument presentation and disclosure requirements. Accounting for investments in debt securities and financial liabilities not measured under the fair value option is largely unaffected by this amendment.	January 1, 2018	ASU No. 2016-01 requires entities to measure investments in equity securities at fair value, unless fair value measurement is impractical, with changes in fair value recognized in current period earnings.  Upon the adoption of ASU No. 2016-01, the Company will recognize the difference between the fair value of its investments in equity securities currently carried at their historical cost (net of impairments) and the securities’ fair value in net income.  As of September 30, 2017, the Company’s investments in equity securities measured at cost have a balance sheet carrying value of $1,257 and an estimated fair value of $5,761.
ASU No. 2016-02, Leases (Topic 842)	This amendment replaces the existing lease accounting model with a revised model.  The primary change effectuated by the revised lease accounting model is the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases.	January 1, 2019	The Company is currently evaluating the impact of this amendment on its consolidated financial statements.

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Standard	Description	Date of Adoption	Effect on the Consolidated Financial Statements
ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 606)	The amendments in this update require financial assets measured at amortized cost as well as available-for-sale debt securities to be measured for impairment on the basis of the net amount expected to be collected.  Credit losses are to be recognized through an allowance for credit losses, which differs from the direct write-down of the amortized cost basis currently required for other-than-temporary impairments of investments in debt securities.  This update also makes substantial changes to the manner in which interest income is to be recognized for financial assets acquired with a more-than-insignificant amount of credit deterioration since origination. This update will not affect the accounting for investments in debt securities that are classified as trading securities.	January 1, 2019	As of September 30, 2017, all of the Company’s investments in debt securities are classified as trading securities. Accordingly, the Company does not expect ASU No. 2016-13 to have a material impact on its consolidated financial statements.
ASU No. 2016-15, Classification of Certain Cash Receipts and Cash Payments (Topic 230)	This amendment was issued to reduce diversity in practice with respect to eight various statement of cash flow reporting issues for which existing GAAP is either unclear or does not provide specific guidance.	January 1, 2018	The Company does not expect that the adoption of ASU No. 2016-15 will have a material impact on the classification of cash inflows or outflows within its consolidated statement of cash flows.
ASU No. 2017-08, Premium Amortization of Purchased Callable Debt Securities (Subtopic 310-20)	This amendment requires purchase premiums for investments in debt securities that are noncontingently callable by the issuer (at a fixed price and preset date) to be amortized to the earliest call date. Previously, purchase premiums for such investments were permitted to be amortized to the instrument’s maturity date.	January 1, 2020	Investments in prepayable financial assets, such as residential MBS, for which the embedded call options are not held by the issuer are not within the scope of ASU No. 2017-08. Accordingly, the Company does not expect the adoption of ASU No. 2017-08 to have a material effect on its consolidated financial statements.

Note 3. Investments in Agency MBS

The Company’s investments in agency MBS are reported in the accompanying consolidated balance sheets at fair value. As of September 30, 2017 and December 31, 2016, the Company had $3,994,515 and $3,911,375, respectively, of fair value in agency MBS classified as trading securities.  

As of September 30, 2017 all of the Company’s investments in agency MBS represent undivided (or “pass-through”) beneficial interests in specified pools of fixed-rate mortgage loans. As of December 31, 2016, the Company’s portfolio of investments in agency MBS also included investments in inverse interest-only agency MBS with an aggregate fair value of $1,923. The Company’s investments in inverse interest-only agency MBS represented beneficial interests in a portion of the interest cash flows of an underlying pool of pass-through agency MBS collateralized by adjustable-rate mortgage loans.

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All periodic changes in the fair value of trading agency MBS that are not attributed to interest income are recognized as a component of “investment gain (loss), net” in the accompanying consolidated statements of comprehensive income. The following table provides additional information about the gains and losses recognized as a component of “investment gain (loss), net” in the Company’s consolidated statements of comprehensive income for the periods indicated with respect to investments in agency MBS classified as trading securities:

	Three Months Ended September 30,					Nine Months Ended September 30,
	2017		2016			2017		2016
Net gains (losses) recognized in earnings for:
Agency MBS still held at period end	$	12,715	$	2,960		$	22,178	$	56,079
Agency MBS sold during the period		1,296		(428	)		3,421		25,195
Total	$	14,011	$	2,532		$	25,599	$	81,274

The Company also invests in and finances fixed-rate agency MBS on a generic pool basis through sequential series of to-be-announced security transactions commonly referred to as “dollar rolls.” Dollar rolls are accounted for as a sequential series of derivative instruments. Refer to “Note 6. Derivative Instruments” for further information about dollar rolls.

Note 4. Investments in Private-Label MBS

The Company’s investments in private-label MBS are reported in the accompanying consolidated balance sheets at fair value. Investments in private-label MBS acquired prior to 2015 were classified as available-for-sale, all of which had been sold as of December 31, 2016. The Company has elected to classify its investments in private-label MBS acquired in 2015 or later as trading securities. As of September 30, 2017 and December 31, 2016, the Company held investments in private-label MBS with a fair value of $54 and $1,266, respectively, all of which were classified as trading securities.

Available-for-Sale Private-Label MBS

Periodic changes in the fair value of the Company’s available-for-sale private-label MBS that are not attributed to interest income or other-than-temporary impairments represent unrealized holding gains and losses. Unrealized holding gains and losses are accumulated in other comprehensive income until the securities are sold. As of September 30, 2017 and December 31, 2016, the Company had no available-for-sale private-label MBS.

Upon the sale of available-for-sale private-label MBS, any gains or losses accumulated in other comprehensive income are recognized in earnings as a component of “investment gain (loss), net.” The Company uses the specific identification method to determine the realized gain or loss that is recognized in earnings upon the sale of an available-for-sale private-label MBS.

The following table presents the results of sales of available-for-sale private-label MBS for the periods indicated:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Proceeds from sales	$	—	$	67,761	$	—	$	96,171
Gross realized gains		—		2,440		—		2,466
Gross realized losses		—		1		—		620

Accretable Yield

The excess of the Company’s estimate of undiscounted future cash flows expected to be collected over the security’s amortized cost basis represents that security’s accretable yield. The accretable yield is expected to be recognized as interest income over the remaining life of the security on a level-yield basis. The difference between undiscounted future contractual cash flows and undiscounted future expected cash flows represents the non-accretable difference. Based on actual payments received and/or changes in the estimate of future cash flows expected to be collected, the accretable yield and the non-accretable difference can change over time. Actual cash collections that exceed prior estimates and/or positive changes in the Company’s periodic estimate of expected future cash flows result in a reclassification of non-accretable difference to accretable yield. Conversely, actual cash collections that fall short of prior estimates and/or adverse changes in the Company’s periodic estimate of expected future cash flows result in a reclassification of accretable yield to non-accretable difference.

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The following table presents the changes in the accretable yield solely for available-for-sale private-label MBS for the periods indicated:

	Three Months Ended September 30,					Nine Months Ended September 30,
	2017		2016			2017		2016
Beginning balance	$	—	$	48,199		$	—	$	85,052
Accretion		—		(1,449	)		—		(6,470	)
Reclassifications, net		—		24			—		(11,853	)
Eliminations in consolidation		—		—			—		(3,515	)
Sales		—		(37,346	)		—		(53,786	)
Ending balance	$	—	$	9,428		$	—	$	9,428

Other-than-Temporary Impairments

The Company evaluates available-for-sale MBS for other-than-temporary impairment on a quarterly basis. When the fair value of an available-for-sale security is less than its amortized cost at the quarterly reporting date, the security is considered impaired. Impairments determined to be other-than-temporary are recognized as a direct write-down to the security’s amortized cost basis with a corresponding charge recognized in earnings as a component of “investment gain (loss), net.” An impairment is considered other-than-temporary when (i) the Company intends to sell the impaired security, (ii) the Company more-likely-than not will be required to sell the impaired security prior to the recovery of its amortized cost basis, or (iii) a credit loss exists. A credit loss exists when the present value of the Company’s estimate of the cash flows expected to be collected from the security, discounted at the security’s existing effective interest rate, is less than the security’s amortized cost basis.

If the Company intends to sell an impaired security or it more-likely-than-not will be required to sell an impaired security before recovery of its amortized cost basis, the Company writes-down the amortized cost basis of the security to an amount equal to the security’s fair value and recognizes a corresponding other-than-temporary impairment charge in earnings as a component of “investment gain (loss), net.” If a credit loss exists for an impaired security that the Company does not intend to sell nor will it likely be required to sell prior to recovery, the Company writes-down the amortized cost basis of the security to an amount equal to the present value of cash flows expected to be collected, discounted at the security’s existing effective interest rate, and recognizes a corresponding other-than-temporary impairment charge in earnings as a component of “investment gain (loss), net.”

For the three and nine months ended September 30, 2016, the Company recorded credit related other-than-temporary impairment charges of $-0- and $1,737 as a component of “investment gain (loss), net” on the consolidated statements of comprehensive income on certain available-for-sale private-label MBS. The Company recorded no other-than-temporary impairment charges on available-for-sale private-label MBS during the three and nine months ended September 30, 2017. The following table presents a summary of cumulative credit related other-than-temporary impairment charges recognized on the available-for-sale private-label MBS held as of the dates indicated:

	Three Months Ended September 30,					Nine Months Ended September 30,
	2017		2016			2017		2016
Cumulative credit related other-than-temporary    impairments, beginning balance	$	—	$	15,754		$	—	$	14,017
Additions for:
Securities for which other-than-temporary    impairments have not previously occurred		—		—			—		1,737
Securities with previously recognized other-than-    temporary impairments		—		—			—		—
Reductions for sold or matured securities		—		(2,035	)		—		(2,035	)
Cumulative credit related other-than-temporary    impairments, ending balance	$	—	$	13,719		$	—	$	13,719

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Trading Private-Label MBS

Periodic changes in the fair value of investments in trading private-label MBS that are not attributable to interest income are recognized as a component of “investment gain (loss), net” in the Company’s consolidated statements of comprehensive income. The following table provides additional information about the net gains and losses recognized as a component of “investment gain (loss), net” for the periods indicated with respect to investments in private-label MBS classified as trading securities:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Net gains (losses) recognized in earnings for:
Private-label MBS still held at period end	$	(15	)	$	(64	)	$	(24	)	$	(280	)
Private-label MBS sold during the period		—			—			57			89
Total	$	(15	)	$	(64	)	$	33		$	(191	)

Note 5. Borrowings

Repurchase Agreements

The Company finances the purchase of MBS through repurchase agreements, which are accounted for as collateralized borrowing arrangements. In a repurchase transaction, the Company sells MBS to a counterparty under a master repurchase agreement in exchange for cash and concurrently agrees to repurchase the same security at a future date in an amount equal to the cash initially exchanged plus an agreed-upon amount of interest. MBS sold under agreements to repurchase remain on the Company’s consolidated balance sheets because the Company maintains effective control over such securities throughout the duration of the arrangement. Throughout the contractual term of a repurchase agreement, the Company recognizes a “repurchase agreement” liability on its consolidated balance sheets to reflect the obligation to repay to the counterparty the proceeds received upon the initial transfer of the MBS. The difference between the proceeds received by the Company upon the initial transfer of the MBS and the contractually agreed-upon repurchase price is recognized as interest expense over the term of the repurchase arrangement on a level-yield basis.

Amounts borrowed pursuant to repurchase agreements are equal in value to a specified percentage of the fair value of the pledged collateral. The Company retains beneficial ownership of the pledged collateral throughout the term of the repurchase agreement. The counterparty to the repurchase agreements may require that the Company pledge additional securities or cash as additional collateral to secure borrowings when the value of the collateral declines.

As of September 30, 2017 and December 31, 2016, the Company had no amount at risk with a single repurchase agreement counterparty or lender greater than 10% of equity. The following table provides information regarding the Company’s outstanding repurchase agreement borrowings as of the dates indicated:

	September 30, 2017			December 31, 2016
Pledged with agency MBS:
Repurchase agreements outstanding	$	3,694,838		$	3,649,102
Agency MBS collateral, at fair value		3,873,154			3,851,269
Net amount (1)		178,316			202,167
Weighted-average rate		1.33	%		0.96	%
Weighted-average term to maturity	11.9 days			19.3 days

⁽¹⁾ Net amount represents the value of collateral in excess of corresponding repurchase obligation. The amount of collateral at-risk is limited to the outstanding repurchase obligation and not the entire collateral balance.

The following table provides information regarding the Company’s outstanding repurchase agreement borrowings during the three and nine months ended September 30, 2017 and 2016:

	September 30, 2017			September 30, 2016
Weighted-average outstanding balance during the three months ended	$	3,819,095		$	3,519,719
Weighted-average rate during the three months ended		1.31	%		0.69	%
Weighted-average outstanding balance during the nine months ended	$	3,956,579		$	3,345,259
Weighted-average rate during the nine months ended		1.10	%		0.67	%

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Long-Term Unsecured Debt

As of September 30, 2017 and December 31, 2016, the Company had $73,824 and $73,656, respectively, of outstanding long-term unsecured debentures, net of unamortized debt issuance costs of $1,476 and $1,644, respectively. The Company’s long-term debentures consisted of the following as of the dates indicated:

	September 30, 2017									December 31, 2016
	Senior Notes Due 2025			Senior Notes Due 2023			Trust Preferred Debt			Senior Notes Due 2025			Senior Notes Due 2023			Trust Preferred Debt
Outstanding Principal	$	35,300		$	25,000		$	15,000		$	35,300		$	25,000		$	15,000
Annual Interest Rate		6.75	%		6.625	%	LIBOR+ 2.25 - 3.00 %				6.75	%		6.625	%	LIBOR+ 2.25 - 3.00 %
Interest Payment Frequency	Quarterly			Quarterly			Quarterly			Quarterly			Quarterly			Quarterly
Weighted-Average Interest Rate		6.75	%		6.625	%		4.05	%		6.75	%		6.625	%		3.63	%
Maturity	March 15, 2025			May 1, 2023			2033 - 2035			March 15, 2025			May 1, 2023			2033 - 2035
Early Redemption Date	March 15, 2018			May 1, 2016			2008 - 2010			March 15, 2018			May 1, 2016			2008 - 2010

The Senior Notes due 2023 and the Senior Notes due 2025 are publicly traded on the New York Stock Exchange under the ticker symbols “AIW” and “AIC,” respectively. The Senior Notes due 2023 and Senior Notes due 2025 may be redeemed in whole or in part at any time and from time to time at the Company’s option on or after May 1, 2016 and March 15, 2018, respectively, at a redemption price equal to the principal amount plus accrued and unpaid interest. The indenture governing these Senior Notes contains certain covenants, including limitations on the Company’s ability to merge or consolidate with other entities or sell or otherwise dispose of all or substantially all of the Company’s assets.

Note 6. Derivative Instruments

In the normal course of its operations, the Company is a party to financial instruments that are accounted for as derivative instruments. Derivative instruments are recorded at fair value as either “derivative assets” or “derivative liabilities” in the consolidated balance sheets, with all periodic changes in fair value reflected as a component of “investment gain (loss), net” in the consolidated statements of comprehensive income. Cash receipts or payments related to derivative instruments are classified as investing activities within the consolidated statements of cash flows.

Types and Uses of Derivative Instruments

Interest Rate Derivatives

Most of the Company’s derivative instruments are interest rate derivatives that are intended to economically hedge changes, attributable to changes in benchmark interest rates, in certain MBS fair values and future interest cash flows on the Company’s short-term financing arrangements. Interest rate derivatives include centrally cleared interest rate swaps, exchange-traded instruments, such as Eurodollar futures, interest rate swap futures, U.S. Treasury note futures and options on futures, and nonexchange-traded instruments such as options on agency MBS. While the Company uses its interest rate derivatives to economically hedge a portion of its interest rate risk, it has not designated such contracts as hedging instruments for financial reporting purposes.

The Company exchanges cash “variation margin” with the counterparties to its interest rate derivative instruments at least on a daily basis based upon daily changes in fair value as measured by the Chicago Mercantile Exchange (“CME”), the central clearinghouse through which those derivatives are cleared. In addition, the CME requires market participants to deposit and maintain an “initial margin” amount which is determined by the CME and is generally intended to be set at a level sufficient to protect the CME from the maximum estimated single-day price movement in that market participant’s contracts.

Receivables recognized for the right to reclaim cash initial margin posted in respect of interest rate derivative instruments are included in the line item “deposits, net” in the accompanying consolidated balance sheets. Prior to January 1, 2017, the daily exchange of variation margin associated with centrally cleared derivative instruments was considered a pledge of collateral. For these prior periods, receivables recognized for the right to reclaim cash variation margin posted in respect of interest rate derivative instruments are included in the line item “deposits, net” in the accompanying consolidated balance sheets. The Company elected to offset any payables recognized for the obligation to return cash variation margin received from an interest rate derivative instrument counterparty against receivables recognized for the right to reclaim cash initial margin posted by the Company to that same counterparty.

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Beginning on January 1, 2017, as a result of a CME amendment to their rule book which governs their central clearing activities, the daily exchange of variation margin associated with a centrally cleared derivative instrument is legally characterized as the daily settlement of the derivative instrument itself, as opposed to a pledge of collateral. Accordingly, beginning in 2017, the Company accounts for the daily receipt or payment of variation margin associated with its centrally cleared interest rate swaps as a direct reduction to the carrying value of the interest rate swap derivative asset or liability, respectively. Beginning in 2017, the carrying amount of centrally cleared interest rate swaps reflected in the Company’s consolidated balance sheets is equal to the unsettled fair value of such instruments; because variation margin is exchanged on a one-day lag, the unsettled fair value of such instruments represents the change in fair value that occurred on the last day of the reporting period.

To-Be-Announced Agency MBS Transactions, Including “Dollar Rolls”

In addition to interest rate derivatives that are used for interest rate risk management, the Company is a party to derivative instruments that economically serve as investments, such as forward contracts to purchase fixed-rate “pass-through” agency MBS on a non-specified pool basis, which are known as to-be-announced (“TBA”) contracts. A TBA contract is a forward contract for the purchase or sale of a fixed-rate agency MBS at a predetermined price, face amount, issuer, coupon, and stated maturity for settlement on an agreed upon future date. The specific agency MBS that will be delivered to satisfy the TBA trade is not known at the inception of the trade. The Company accounts for TBA contracts as derivative instruments because the Company cannot assert that it is probable at inception and throughout the term of an individual TBA contract that its settlement will result in physical delivery of the underlying agency MBS, or the individual TBA contract will not settle in the shortest time period possible.

The Company’s agency MBS investment portfolio includes net purchase (or “net long”) positions in TBA securities, which are primarily the result of executing sequential series of “dollar roll” transactions. The Company executes dollar roll transactions as a means of investing in and financing non-specified fixed-rate agency MBS. Such transactions involve effectively delaying (or “rolling”) the settlement of a forward purchase of a TBA agency MBS by entering into an offsetting sale prior to the settlement date, net settling the “paired-off” positions in cash, and contemporaneously entering another forward purchase of a TBA agency MBS of the same characteristics for a later settlement date. TBA securities purchased for a forward settlement month are generally priced at a discount relative to TBA securities sold for settlement in the current month. This discount, often referred to as the dollar roll “price drop,” reflects compensation for the net interest income (interest income less financing costs) that is foregone as a result of relinquishing beneficial ownership of the MBS for the duration of the dollar roll (also known as “dollar roll income”). By executing a sequential series of dollar roll transactions, the Company is able to create the economic experience of investing in an agency MBS, financed with a repurchase agreement, over a period of time. Forward purchases and sales of TBA securities are accounted for as derivative instruments in the Company’s financial statements. Accordingly, dollar roll income is recognized as a component of “investment gain (loss), net” along with all other periodic changes in the fair value of TBA commitments.

In addition to transacting in net long positions in TBA securities for investment purposes, the Company may also, from time to time, transact in net sale (or “net short”) positions in TBA securities for the purpose of economically hedging a portion of the sensitivity of the fair value of the Company’s investments in agency MBS to changes in interest rates.

Receivables recognized for the right to reclaim cash collateral posted by the Company in respect of TBA transactions is included in the line item “deposits, net” in the accompanying consolidated balance sheets. Liabilities recognized for the obligation to return cash collateral received by the Company in respect of TBA transactions is included in the line item “other liabilities” in the accompanying consolidated balance sheets.

In addition to TBA transactions, the Company may, from time to time, enter into commitments to purchase or sell specified agency MBS that do not qualify as regular-way security trades. Such commitments are also accounted for as derivative instruments.

Derivative Instrument Population and Fair Value

The following table presents the fair value of the Company’s derivative instruments as of the dates indicated:

	September 30, 2017					December 31, 2016
	Assets		Liabilities			Assets		Liabilities
Interest rate swaps	$	3,348	$	—		$	63,315	$	(1,949	)
10-year U.S. Treasury note futures		820		—			—		—
Options on 10-year U.S. Treasury note futures		1		—			4,289		(3,906	)
Options on agency MBS		8		—			—		—
TBA commitments		—		(7,146	)		7,285		(3,699	)
Total	$	4,177	$	(7,146	)	$	74,889	$	(9,554	)

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Interest Rate Swaps

The Company’s interest rate swap agreements represent agreements to make semiannual interest payments based upon a fixed interest rate and receive quarterly variable interest payments based upon the prevailing three-month LIBOR on the date of reset.

The following table presents information about the Company’s interest rate swap agreements that were in effect as of September 30, 2017:

			Weighted-average:
	Notional Amount		Fixed Pay Rate			Variable Receive Rate			Net Receive (Pay) Rate			Remaining Life (Years)		Fair Value
Years to maturity:
Less than 3 years	$	1,300,000		1.26	%		1.32	%		0.06	%		1.7	$	447
3 to less than 7 years		700,000		1.87	%		1.32	%		(0.55	)%		4.1		844
7 to 10 years		1,600,000		1.90	%		1.32	%		(0.58	)%		8.5		1,963
Total / weighted-average	$	3,600,000		1.66	%		1.32	%		(0.34	)%		5.2	$	3,254

The following table presents information about the Company’s forward-starting interest rate swap agreements that had yet to take effect as of September 30, 2017:

			Weighted-average:
	Notional Amount		Fixed Pay Rate			Term After Effective Date (Years)		Fair Value
Effective in October 2017	$	250,000		1.12	%		2.0	$	94

The following table presents information about the Company’s interest rate swap agreements that were in effect as of December 31, 2016:

			Weighted-average:
	Notional Amount		Fixed Pay Rate			Variable Receive Rate			Net (Pay) Rate			Remaining Life (Years)		Fair Value
Years to maturity:
Less than 3 years	$	1,375,000		1.10	%		0.97	%		(0.13	)%		1.7	$	6,470
3 to less than 7 years		350,000		1.84	%		1.00	%		(0.84	)%		3.7		(769	)
7 to 10 years		1,600,000		1.93	%		0.96	%		(0.97	)%		9.2		50,511
Total / weighted-average	$	3,325,000		1.58	%		0.97	%		(0.61	)%		5.5	$	56,212

The following table presents information about the Company’s forward-starting interest rate swap agreements that had yet to take effect as of December 31, 2016:

			Weighted-average:
	Notional Amount		Fixed Pay Rate			Term After Effective Date (Years)		Fair Value
Effective in September / October 2017	$	375,000		1.13	%		2.0	$	5,154

10-year U.S. Treasury Note Futures

The Company’s 10-year U.S. Treasury note futures held as of September 30, 2017, are short positions with an aggregate notional amount of $350,000 that mature in December 2017. Upon the maturity date of these futures contracts, the Company has the option to either net settle each contract in cash in an amount equal to the difference between the then-current fair value of the

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underlying 10-year U.S. Treasury note and the contractual sale price inherent to the futures contract, or to physically settle the contract by delivering the underlying 10-year U.S. Treasury note.

Options on 10-year U.S. Treasury Note Futures

The Company purchases and sells exchange-traded options on 10-year U.S. Treasury note futures contracts with the objective of economically hedging a portion of the sensitivity of its investments in agency MBS to significant changes in interest rates. The Company may purchase put options which provide the Company with the right to sell 10-year U.S. Treasury note futures to a counterparty, and the Company may also write call options that provide a counterparty with the option to buy 10-year U.S. Treasury note futures from the Company. In order to limit its exposure on its interest rate derivative instruments from a significant decline in long-term interest rates, the Company may also purchase contracts that provide the Company with the option to buy, or call, 10-year U.S. Treasury note futures from a counterparty. The options may be exercised at any time prior to their expiry, and if exercised, may be net settled in cash or through physical receipt or delivery of the underlying futures contracts. Information about the Company’s outstanding options on 10-year U.S. Treasury note futures contracts as of September 30, 2017 is as follows:

	Notional Amount		Weighted-average Strike Price		Implied Strike Rate (1)			Net Fair Value
Purchased call options:
October 2017 expiration	$	150,000		133.0		1.49	%	$	1

(1) The implied strike rate is estimated based upon the weighted average strike price per contract and the price of an equivalent 10-year U.S. Treasury note futures contract.

Information about the Company’s outstanding options on 10-year U.S. Treasury note futures contracts as of December 31, 2016 is as follows:

	Notional Amount			Weighted-average Strike Price		Implied Strike Rate (1)			Net Fair Value
Purchased put options:
January 2017 expiration	$	950,000			120.8		2.87	%	$	539
February 2017 expiration		700,000			122.6		2.64	%		3,281
Total / weighted average for purchased put options	$	1,650,000			121.6		2.77	%	$	3,820
Sold call options:
January 2017 expiration	$	(100,000	)		126.0		2.25	%	$	(141	)
February 2017 expiration		(900,000	)		126.0		2.24	%		(3,765	)
Total / weighted average for sold call options	$	(1,000,000	)		126.0		2.24	%	$	(3,906	)
Purchased call options:
January 2017 expiration	$	1,000,000			127.1		2.12	%	$	469
									$	383

(1) The implied strike rate is estimated based upon the weighted average strike price per contract and the price of an equivalent 10-year U.S. Treasury note futures contract.

Options on Agency MBS

The Company may purchase put options which provide the Company with the right to sell TBA-eligible agency MBS to a counterparty at a fixed price in the event that agency MBS prices decline. The options can only be exercised at their expiry, and if exercised, may be net settled in cash or through physical delivery of the underlying agency MBS. Information about the Company’s outstanding options on agency MBS as of September 30, 2017 is as follows:

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	Notional Amount		Weighted-average Strike Price		Underlying Agency MBS Coupon			Net Fair Value
Purchased put options:
October 2017 expiration	$	500,000		102.5		4.00	%	$	-
November 2017 expiration		200,000		103.5		4.00	%		8
Total / weighted average for purchased put options	$	700,000		102.8		4.00	%	$	8

TBA Commitments

The following tables present information about the Company’s TBA commitments as of the dates indicated:

	September 30, 2017
	Notional Amount: Net Purchase (Sale) Commitment			Contractual Forward Price			Market Price			Fair Value
Dollar roll positions:
3.0% coupon purchase commitments	$	200,000		$	202,258		$	200,563		$	(1,695	)
3.5% coupon purchase commitments		1,005,000			1,040,762			1,036,092			(4,670	)
4.0% coupon purchase commitments		250,000			263,929			263,164			(765	)
4.0% coupon sale commitments		(100,000	)		(105,250	)		(105,266	)		(16	)
Total TBA commitments, net	$	1,355,000		$	1,401,699		$	1,394,553		$	(7,146	)

	December 31, 2016
	Notional Amount: Net Purchase (Sale) Commitment			Contractual Forward Price			Market Price			Fair Value
Dollar roll positions:
3.0% coupon purchase commitments	$	725,000		$	718,887		$	720,027		$	1,140
3.5% coupon purchase commitments		25,000			25,586			25,613			27
3.5% coupon sale commitments		(25,000	)		(25,602	)		(25,613	)		(11	)
Total dollar roll positions, net		725,000			718,871			720,027			1,156
TBA commitments serving as economic hedges:
3.5% coupon purchase commitments		600,000			608,601			614,719			6,118
3.5% coupon sale commitments		(600,000	)		(611,031	)		(614,719	)		(3,688	)
Total economic hedges, net		—			(2,430	)		—			2,430
Total TBA commitments, net	$	725,000		$	716,441		$	720,027		$	3,586

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Derivative Instrument Gains and Losses

The following tables provide information about the derivative gains and losses recognized within the periods indicated:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Interest rate derivatives:
Interest rate swaps:
Net interest expense (1)	$	(4,198	)	$	(5,126	)	$	(14,900	)	$	(13,499	)
Unrealized gains (losses), net		10,833			15,426			(7,991	)		(65,519	)
Losses realized upon early termination		(14,137	)		(300	)		(13,441	)		(300	)
Total interest rate swap (losses) gains, net		(7,502	)		10,000			(36,332	)		(79,318	)
U.S. Treasury note futures, net		(133	)		—			(2,174	)		(63,285	)
Options on U.S. Treasury note futures, net		(147	)		(1,631	)		(6,300	)		(7,880	)
Other, net		(221	)		—			(221	)		(25	)
Total interest rate derivative (losses) gains, net		(8,003	)		8,369			(45,027	)		(150,508	)
TBA and specified agency MBS commitments:
TBA dollar roll income (2)		6,424			5,321			14,120			12,835
Other gains on agency MBS commitments, net		1,007			1,506			962			17,728
Total gains on agency MBS commitments, net		7,431			6,827			15,082			30,563
Total derivative (losses) gains, net	$	(572	)	$	15,196		$	(29,945	)	$	(119,945	)

(1) Represents the periodic net interest settlement incurred during the period (often referred to as “net interest carry”). Beginning in 2017, also includes “price alignment interest” income earned or expense incurred on cumulative variation margin paid or received, respectively, associated with centrally cleared interest rate swap agreements.

(2) Represents the price discount of forward-settling TBA purchases relative to a contemporaneously executed “spot” TBA sale, which economically equates to net interest income that is earned ratably over the period beginning on the settlement date of the sale and ending on the settlement date of the forward-settling purchase.

Derivative Instrument Activity

The following tables summarize the volume of activity, in terms of notional amount, related to derivative instruments for the periods indicated:

	For the Three Months Ended September 30, 2017
	Beginning of Period		Additions		Scheduled Settlements			Early Terminations			End of Period
Interest rate swaps	$	3,850,000	$	500,000	$	—		$	(500,000	)	$	3,850,000
10-year U.S. Treasury note futures		350,000		351,000		(351,000	)		—			350,000
Purchased call options on 10-year U.S. Treasury note   futures		700,000		950,000		(1,500,000	)		—			150,000
Purchased put options on agency MBS		—		700,000		—			—			700,000
Commitments to purchase (sell) MBS, net		1,110,000		4,160,000		(3,915,000	)		—			1,355,000

	For the Three Months Ended September 30, 2016
	Beginning of Period		Additions		Scheduled Settlements			Early Terminations			End of Period
Interest rate swaps	$	2,250,000	$	1,250,000	$	—		$	(375,000	)	$	3,125,000
10-year U.S. Treasury note futures		—		15,000		(15,000	)		—			—
Purchased put options on 10-year U.S. Treasury note   futures		2,000,000		2,100,000		(3,500,000	)		—			600,000
Sold call options on 10-year U.S. Treasury note futures		—		1,000,000		(400,000	)		—			600,000
Purchased call options on 10-year U.S. Treasury note   futures		—		500,000		(200,000	)		—			300,000
Commitments to purchase (sell) MBS, net		875,441		2,675,000		(2,425,441	)		—			1,125,000

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	For the Nine Months Ended September 30, 2017
	Beginning of Period		Additions		Scheduled Settlements			Early Terminations			End of Period
Interest rate swaps	$	3,700,000	$	1,275,000	$	—		$	(1,125,000	)	$	3,850,000
10-year U.S. Treasury note futures		—		1,196,100		(846,100	)		—			350,000
Purchased put options on 10-year U.S. Treasury note   futures		1,650,000		2,540,000		(4,190,000	)		—			—
Sold call options on 10-year U.S. Treasury note futures		1,000,000		2,450,000		(3,450,000	)		—			—
Purchased call options on 10-year U.S. Treasury note   futures		1,000,000		3,350,000		(4,200,000	)		—			150,000
Purchased put options on agency MBS		—		700,000		—			—			700,000
Commitments to purchase (sell) MBS, net		725,000		8,475,000		(7,845,000	)		—			1,355,000

	For the Nine Months Ended September 30, 2016
	Beginning of Period		Additions		Scheduled Settlements			Early Terminations			End of Period
Interest rate swaps	$	1,500,000	$	2,000,000	$	—		$	(375,000	)	$	3,125,000
10-year U.S. Treasury note futures		1,335,000		1,386,000		(2,133,500	)		(587,500	)		—
Purchased put options on 10-year U.S. Treasury note   futures		—		8,100,000		(7,500,000	)		—			600,000
Sold call options on 10-year U.S. Treasury note futures		—		1,000,000		(400,000	)		—			600,000
Purchased call options on 10-year U.S. Treasury note   futures		—		500,000		(200,000	)		—			300,000
Put options on Eurodollar futures		4,000,000		—		(4,000,000	)		—			—
Commitments to purchase (sell) MBS, net		375,000		6,225,441		(5,475,441	)		—			1,125,000

Cash Collateral Posted and Received for Derivative and Other Financial Instruments

The following table presents information about the cash collateral posted and received by the Company in respect of its derivative and other financial instruments, which is included in the line item “deposits, net” in the accompanying consolidated balance sheets, for the dates indicated:

	September 30, 2017		December 31, 2016
Cash collateral posted for:
Interest rate swaps (cash initial margin)	$	49,518	$	65,728
U.S. Treasury note futures and options on U.S. Treasury note   futures (cash initial margin)		4,035		5,314
Unsettled MBS trades and TBA commitments, net		5,764		1,474
Total cash collateral posted		59,317		72,516
Cash collateral received for interest rate swaps (1)		—		(61,367	)
Total cash collateral posted, net	$	59,317	$	11,149

(1) Beginning in 2017, the Company accounts for the daily receipt or payment of cash variation margin associated with centrally cleared interest rate swaps as a legal settlement of the derivative instrument itself, as opposed to a pledge of collateral.

Note 7. Offsetting of Financial Assets and Liabilities

The agreements that govern certain of the Company’s derivative instruments and collateralized short-term financing arrangements provide for a right of setoff in the event of default or bankruptcy with respect to either party to such transactions. The Company presents derivative assets and liabilities as well as collateralized short-term financing arrangements on a gross basis.

Receivables recognized for the right to reclaim cash initial margin posted in respect of interest rate derivative instruments are included in the line item “deposits, net” in the accompanying consolidated balance sheets. Prior to January 1, 2017, the daily exchange

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of variation margin associated with centrally cleared derivative instruments was considered a pledge of collateral. For these prior periods, receivables recognized for the right to reclaim cash variation margin posted in respect of interest rate derivative instruments are included in the line item “deposits, net” in the accompanying consolidated balance sheets. The Company elected to offset any payables recognized for the obligation to return cash variation margin received from an interest rate derivative instrument counterparty against receivables recognized for the right to reclaim cash initial margin posted by the Company to that same counterparty.

Beginning on January 1, 2017, as a result of a CME amendment to their rule book which governs their central clearing activities, the daily exchange of variation margin associated with a centrally cleared derivative instrument is legally characterized as the daily settlement of the derivative instrument itself, as opposed to a pledge of collateral. Accordingly, beginning in 2017, the Company accounts for the daily receipt or payment of variation margin associated with its centrally cleared interest rate swaps as a direct reduction to the carrying value of the interest rate swap derivative asset or liability, respectively. Beginning in 2017, the carrying amount of centrally cleared interest rate swaps reflected in the Company’s consolidated balance sheets is equal to the unsettled fair value of such instruments; because variation margin is exchanged on a one-day lag, the unsettled fair value of such instruments represents the change in fair value that occurred on the last day of the reporting period.

The following tables present information, as of the dates indicated, about the Company’s derivative instruments, short-term borrowing arrangements, and associated collateral, including those subject to master netting (or similar) arrangements:

	As of September 30, 2017
	Gross Amount Recognized		Amount Offset in the Consolidated Balance Sheets		Net Amount Presented in the Consolidated Balance Sheets		Gross Amount Not Offset in the Consolidated Balance Sheets						Net Amount
							Financial Instruments (1)			Cash Collateral (2)
Assets:
Derivative instruments:
Options on U.S. Treasury note futures	$	1	$	—	$	1	$	—		$	—		$	1
U.S. Treasury note futures		820		—		820		—			(820	)		—
Interest rate swaps		3,348		—		3,348		—			(3,348	)		—
Options on agency MBS		8		—		8		—			—			8
Total derivative instruments		4,177		—		4,177		—			(4,168	)		9
Total assets	$	4,177	$	—	$	4,177	$	—		$	(4,168	)	$	9
Liabilities:
Unsettled MBS trades and TBA   commitments, net (3)	$	7,146	$	—	$	7,146	$	—		$	(5,764	)	$	1,382
Repurchase agreements		3,694,838		—		3,694,838		(3,694,838	)		—			—
Total liabilities	$	3,701,984	$	—	$	3,701,984	$	(3,694,838	)	$	(5,764	)	$	1,382

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	As of December 31, 2016
	Gross Amount Recognized		Amount Offset in the Consolidated Balance Sheets			Net Amount Presented in the Consolidated Balance Sheets		Gross Amount Not Offset in the Consolidated Balance Sheets						Net Amount
								Financial Instruments (1)			Cash Collateral (2)
Assets:
Derivative instruments:
Options on U.S. Treasury note futures	$	4,289	$	—		$	4,289	$	(3,906	)	$	—		$	383
Interest rate swaps		63,315		—			63,315		(1,949	)		(61,366	)		—
TBA commitments		7,285		—			7,285		—			—			7,285
Total derivative instruments		74,889		—			74,889		(5,855	)		(61,366	)		7,668
Deposits, net		72,516		(61,367	)		11,149		—			—			11,149
Total assets	$	147,405	$	(61,367	)	$	86,038	$	(5,855	)	$	(61,366	)	$	18,817
Liabilities:
Derivative instruments:
Options on U.S. Treasury note futures	$	3,906	$	—		$	3,906	$	(3,906	)	$	—		$	—
Interest rate swaps		1,949		—			1,949		(1,949	)		—			—
TBA commitments		3,699		—			3,699		—			(1,474	)		2,225
Total derivative instruments		9,554		—			9,554		(5,855	)		(1,474	)		2,225
Deposits, net		61,367		(61,367	)		—		—			—			—
Repurchase agreements		3,649,102		—			3,649,102		(3,649,102	)		—			—
Total liabilities	$	3,720,023	$	(61,367	)	$	3,658,656	$	(3,654,957	)	$	(1,474	)	$	2,225

⁽¹⁾ Does not include the fair value amount of financial instrument collateral pledged in respect of repurchase agreements that exceeds the associated liability presented in the consolidated balance sheets.

⁽²⁾ Does not include the amount of cash collateral pledged in respect of derivative instruments that exceeds the associated derivative liability presented in the consolidated balance sheets.

⁽³⁾ The “Gross Amount Recognized” and “Net Amount Presented in the Consolidated Balances Sheets” excludes the fair value of unsettled agency MBS purchases and sales recognized on their respective trade dates.

Note 8. Fair Value Measurements

Fair Value of Financial Instruments

The accounting principles related to fair value measurements define fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Financial Accounting Standards Board Accounting Standards Codification Topic 820, Fair Value Measurements and Disclosures, establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels, giving the highest priority to quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3) as described below:

Level 1 Inputs -  Unadjusted quoted prices in active markets for identical assets or liabilities that are accessible by the Company at the measurement date;

Level 2 Inputs -  Quoted prices in markets that are not active or financial instruments for which all significant inputs are observable, either directly or indirectly; and

Level 3 Inputs -  Unobservable inputs for the asset or liability, including significant judgments made by the Company about the assumptions that a market participant would use.

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The Company measures the fair value of the following assets and liabilities:

Mortgage-backed securities

Agency MBS - The Company’s investments in agency MBS are classified within Level 2 of the fair value hierarchy. Inputs to fair value measurements of the Company’s investments in agency MBS include price estimates obtained from third-party pricing services. In determining fair value, third-party pricing services use a market approach. The inputs used in the fair value measurements performed by the third-party pricing services are based upon readily observable transactions for securities with similar characteristics (such as issuer/guarantor, coupon rate, stated maturity, and collateral pool characteristics) occurring on the measurement date. The Company makes inquiries of the third-party pricing sources to understand the significant inputs and assumptions used to determine prices. The Company reviews the various third-party fair value estimates and performs procedures to validate their reasonableness, including comparison to recent trading activity for similar securities and an overall review for consistency with market conditions observed as of the measurement date.

Private-label MBS - The Company’s investments in private-label MBS are classified within Level 3 of the fair value hierarchy as private-label MBS trade infrequently and, therefore, the measurement of their fair value requires the use of significant unobservable inputs. In determining fair value, the Company primarily uses an income approach as well as market approaches. The Company utilizes present value techniques based on the estimated future cash flows of the instrument taking into consideration various assumptions derived by management based on their observations of assumptions used by market participants. These assumptions are corroborated by evidence such as historical collateral performance data, evaluation of historical collateral performance data for other securities with comparable or similar risk characteristics, and observed completed or pending transactions in similar instruments, when available. The significant inputs to the Company’s valuation process include collateral default, loss severity, prepayment, and discount rates (i.e., the rate of return demanded by market participants as of the measurement date). In general, significant increases (decreases) in default, loss severity, or discount rate assumptions, in isolation, would result in a significantly lower (higher) fair value measurement. However, significant increases (decreases) in prepayment rate assumptions, in isolation, may result in a significantly higher (lower) fair value measurement depending upon the instrument’s specific characteristics and the overall payment structure of the issuing securitization vehicle. It is difficult to generalize the interrelationships between these significant inputs as the actual results could differ considerably on an individual security basis. Therefore, each significant input is closely analyzed to ascertain its reasonableness for the Company’s purposes of fair value measurement.

Measuring fair value is inherently subjective given the volatile and sometimes illiquid markets for these private-label MBS and requires management to make a number of judgments about the assumptions that a market participant would use, including assumptions about the timing and amount of future cash flows as well as the rate of return required by market participants. The assumptions the Company applies are specific to each security. Although the Company relies on its internal calculations to estimate the fair value of these private-label MBS, the Company considers indications of value from actual sales of similar private-label MBS to assist in the valuation process and to calibrate the Company’s models.

Derivative instruments

Exchange-traded derivative instruments - Exchange-traded derivative instruments, which include Eurodollar futures, U.S. Treasury note futures, interest rate swap futures, and options on futures, are classified within Level 1 of the fair value hierarchy as they are measured using quoted prices for identical instruments in liquid markets.

Interest rate swaps - Interest rate swaps are classified within Level 2 of the fair value hierarchy. The fair values of the Company’s centrally cleared interest rate swaps are measured using the daily valuations reported by the clearinghouse through which the instrument was cleared. In performing its end-of-day valuations, the clearinghouse constructs forward interest rate curves (for example, three-month LIBOR forward rates) from its specific observations of that day’s trading activity. The clearinghouse uses the applicable forward interest rate curve to develop a market-based forecast of future remaining contractually required cash flows for each interest rate swap. Each market-based cash flow forecast is then discounted using the overnight index swap rate curve (sourced from the Federal Reserve Bank of New York) to determine a net present value amount which represents the instrument’s fair value. The Company reviews the valuations reported by the clearinghouse on an ongoing basis and performs procedures using readily available market data to independently verify their reasonableness.

Forward-settling purchases and sales of TBA securities – Forward-settling purchases and sales of TBA securities are classified within Level 2 of the fair value hierarchy. The fair value of each forward-settling TBA contract is measured using price estimates obtained from a third-party pricing service, which are based upon readily observable transaction prices occurring on the measurement date for forward-settling contracts to buy or sell TBA securities with the same guarantor, contractual maturity, and coupon rate for delivery on the same forward settlement date as the contract under measurement.

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Other

Long-term unsecured debt - As of September 30, 2017 and December 31, 2016, the carrying value of the Company’s long-term unsecured debt was $73,824 and $73,656, respectively, net of unamortized debt issuance costs, and consists of Senior Notes and trust preferred debt issued by the Company. The Company’s estimate of the fair value of long-term unsecured debt is $71,152 and $66,489 as of September 30, 2017 and December 31, 2016, respectively. The Company’s Senior Notes, which are publicly traded on the New York Stock Exchange, are classified within Level 1 of the fair value hierarchy. Trust preferred debt is classified within Level 2 of the fair value hierarchy as the fair value is estimated based on the quoted prices of the Company’s publicly traded Senior Notes.

Investments in equity securities of non-public companies and investment funds - As of September 30, 2017 and December 31, 2016, the Company had investments in equity securities and investment funds with a carrying amount of $1,701 and $1,918, respectively, which are included in the line item “other assets” in the accompanying consolidated balance sheets.  As of September 30, 2017 and December 31, 2016, $444 and $533, respectively, of these investments represent securities for which the Company elected the “fair value option” at the time that the securities were initially recognized on the Company’s consolidated balance sheets; the Company measures the fair value of these securities on a recurring basis, recognizing the periodic change in fair value in earnings. The remaining $1,257 and $1,385 in investments in equity securities of non-public companies and investment funds as of September 30, 2017 and December 31, 2016, respectively, were measured at cost, net of impairments. The Company’s estimate of the fair value of investments in equity securities and investment funds is $6,205 and $6,034 as of September 30, 2017 and December 31, 2016, respectively. Investments in equity securities and investment funds are classified within Level 3 of the fair value hierarchy. The fair values of the Company’s investments in equity securities and investment funds are not readily determinable. Accordingly, for its investments in equity securities, the Company estimates fair value by estimating the enterprise value of the investee and then waterfalls the enterprise value over the investee’s securities in the order of their preference relative to one another. To estimate the enterprise value of the investee, the Company uses traditional valuation methodologies, including the consideration of recent investments in, or tender offers for, the equity securities of the investee. For its investments in investment funds, the Company estimates fair value based upon the investee’s net asset value per share.

Financial assets and liabilities for which carrying value approximates fair value - Cash and cash equivalents, deposits, receivables, repurchase agreements, payables, and other assets and liabilities are reflected in the consolidated balance sheets at their cost, which, due to the short-term nature of these instruments and their limited inherent credit risk, approximates fair value.

Fair Value Hierarchy

Financial Instruments Measured at Fair Value on a Recurring Basis

The following tables set forth financial instruments measured at fair value by level within the fair value hierarchy as of September 30, 2017 and December 31, 2016. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.

	September 30, 2017
	Total			Level 1		Level 2			Level 3
MBS
Trading:
Agency MBS	$	3,994,515		$	—	$	3,994,515		$	—
Private-label MBS		54			—		—			54
Total MBS		3,994,569			—		3,994,515			54
Derivative assets		4,177			821		3,356			—
Derivative liabilities		(7,146	)		—		(7,146	)		—
Other assets		444			—		—			444
Total	$	3,992,044		$	821	$	3,990,725		$	498

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	December 31, 2016
	Total			Level 1			Level 2			Level 3
MBS
Trading:
Agency MBS	$	3,911,375		$	—		$	3,911,375		$	—
Private-label MBS		1,266			—			—			1,266
Total MBS		3,912,641			—			3,911,375			1,266
Derivative assets		74,889			4,289			70,600			—
Derivative liabilities		(9,554	)		(3,906	)		(5,648	)		—
Other assets		533			—			—			533
Total	$	3,978,509		$	383		$	3,976,327		$	1,799

There were no transfers of financial instruments into or out of Levels 1, 2 or 3 during the three and nine months ended September 30, 2017 or the year ended December 31, 2016.

Level 3 Financial Assets and Liabilities

The following table provides information about the significant unobservable inputs used to measure the fair value of the Company’s private-label MBS as of the dates indicated:

	September 30, 2017				December 31, 2016
	Weighted- average (1)		Range		Weighted- average (1)			Range
Discount rate		—		—		6.50	%	6.50 - 6.50 %
Default rate		—		—		2.25	%	2.25 - 2.25 %
Loss severity rate		—		—		45.00	%	45.00 - 45.00 %
Total prepayment rate (including defaults)		—		—		10.25	%	10.25 - 10.25 %

⁽¹⁾Based on face value.

The table below sets forth an attribution of the change in the fair value of the Company’s Level 3 investments that are measured at fair value on a recurring basis for the periods indicated:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Beginning balance	$	618		$	89,186		$	1,799		$	130,553
Total net gains (losses)
Included in investment gain (loss), net		(116	)		2,994			(55	)		537
Included in other comprehensive income		—			(3,325	)		—			(11,739	)
Purchases		—			—			—			5,357
Sales		—			(67,761	)		(1,268	)		(106,052	)
Payments, net		(6	)		(826	)		(60	)		(4,170	)
Accretion of discount		2			1,655			82			7,437
Ending balance	$	498		$	21,923		$	498		$	21,923
Net unrealized gains (losses) included in earnings for the    period for Level 3 assets still held at the reporting date	$	(116	)	$	(64	)	$	(113	)	$	(280	)

Note 9. Income Taxes

Arlington Asset is subject to taxation as a corporation under Subchapter C of the Internal Revenue Code of 1986, as amended (the “Code”).  As of September 30, 2017, the Company had estimated net operating loss (“NOL”) carry-forwards of $69,720 that can be used to offset future taxable ordinary income.  The Company’s NOL carry-forwards begin to expire in 2027.  As of September 30, 2017, the Company had estimated net capital loss (“NCL”) carry-forwards of $309,751 that can be used to offset future net capital gains.  The scheduled expirations of the Company’s NCL carry-forwards are $136,505 in 2019, $102,927 in 2020, and $70,319 in 2021.  The Company is subject to federal alternative minimum tax (“AMT”) and state and local taxes on its taxable income and gains

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that are not offset by its NOL and NCL carry-forwards.  As of September 30, 2017, the Company had estimated AMT credit carry-forwards of $8,952 that can be used to offset future taxable ordinary income.  The AMT credit carry-forwards do not expire.

Income taxes are provided for using the asset and liability method.  Deferred tax assets and liabilities reflect the impact of temporary differences between the carrying amount of assets and liabilities pursuant to the application of GAAP and their respective tax bases and are stated at tax rates expected to be in effect when the taxes are actually paid or recovered.  Deferred tax assets are also recognized for NOL carry-forwards, NCL carry-forwards and any tax credit carry-forwards.  

A valuation allowance is provided against the deferred tax asset if, based upon the Company’s evaluation, it is more-likely-than-not that some or all of the deferred tax assets will not be realized.  All available evidence, both positive and negative, is incorporated into the determination of whether a valuation allowance for deferred tax assets is appropriate.  Items considered in the valuation allowance determination include expectations of future earnings of the appropriate tax character, recent historical financial results, tax planning strategies, the length of statutory carry-forward periods and the expected timing of the reversal of temporary differences.  As of September 30, 2017, the Company determined that it should record a full valuation allowance against its deferred tax assets that are capital in nature, which consists of its NCL carry-forwards and temporary GAAP to tax differences that are expected to result in capital losses in future periods.  As of September 30, 2017, the Company determined that it should not record any valuation allowance against its deferred tax assets that are ordinary in nature, which consists of its NOL carry-forwards, tax credit carry-forwards and temporary GAAP to tax differences that are expected to result in deductions from ordinary income in future periods. For the three months ended September 30, 2017, the Company recorded a decrease to its valuation allowance of $8,417, and for the nine months ended September 30, 2017, the Company recorded an increase to its valuation allowance of $11,541.

Deferred tax assets and liabilities consisted of the following as of the dates indicated:

	September 30, 2017			December 31, 2016
Ordinary deferred tax assets:
NOL carry-forward	$	27,121		$	37,238
AMT credit carry-forward		8,952			8,427
Deferred net loss on designated derivatives		6,717			1,386
Stock-based compensation		2,563			2,426
Other, net		137			208
Total ordinary deferred tax assets		45,490			49,685
Ordinary deferred tax liabilities:
Net unrealized gain on designated derivatives		(22,037	)		(25,145	)
Ordinary deferred tax assets, net		23,453			24,540
Capital deferred tax assets:
NCL carry-forward		120,493			120,939
Net unrealized loss on investments		31,951			44,253
Valuation allowance		(152,444	)		(140,903	)
Total capital deferred tax assets, net		—			24,289
Total deferred tax assets, net	$	23,453		$	48,829

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Note 10. Earnings (Loss) Per Share

Basic earnings per share includes no dilution and is computed by dividing net income or loss applicable to common stock by the weighted-average number of common shares outstanding for the respective period. Diluted earnings per share includes the impact of dilutive securities such as unvested shares of restricted stock and performance share units. The following tables present the computations of basic and diluted earnings (loss) per share for the periods indicated:

	Three Months Ended September 30,				Nine Months Ended September 30,
(Shares in thousands)	2017		2016		2017		2016
Basic weighted-average common shares outstanding		26,377		23,038		24,793		23,011
Performance share units and unvested restricted stock		479		311		350		143
Diluted weighted-average common shares outstanding		26,856		23,349		25,143		23,154
Net income attributable to common stock	$	22,785	$	18,813	$	10,076	$	89
Basic earnings per common share	$	0.86	$	0.82	$	0.41	$	-
Diluted earnings per common share	$	0.85	$	0.81	$	0.40	$	-

Note 11. Stockholders’ Equity

Common Stock

The Company has authorized share capital of 450,000,000 shares of Class A common stock, par value $0.01 per share, and 100,000,000 shares of Class B common stock, par value $0.01 per share.  Holders of the Class A and Class B common stock are entitled to one vote and three votes per share, respectively, on all matters voted upon by the shareholders. Shares of Class B common stock are convertible into shares of Class A common stock on a one-for-one basis at the option of the Company in certain circumstances including either (i) upon sale or other transfer, or (ii) at the time the holder of such shares of Class B common stock ceases to be employed by the Company.  

During the nine months ended September 30, 2017 and during the year ended December 31, 2016, holders of the Company's Class B common stock converted an aggregate of 20,256 and 81,960 shares of Class B common stock into 20,256 and 81,960 shares of Class A common stock, respectively.  As of September 30, 2017, all remaining shares of Class B common stock had been exchanged for shares of the Company’s Class A common stock.

Preferred Stock

The Company has authorized share capital of 2,000,000 shares of 7.00% Series B Cumulative Perpetual Redeemable Preferred Stock (the “Series B Preferred Stock”), par value of $.01 per share, and 100,000 authorized and unissued shares designated as Series A Preferred Stock, and 22,900,000 shares of undesignated preferred stock. The Company’s Board of Directors has the authority, without further action by the shareholders, to issue additional preferred stock in one or more series and to fix the terms and rights of the preferred stock.

In May 2017, the Company completed a public offering in which 135,000 shares of its Series B Preferred Stock were issued to the public at a public offering price of $24.00 per share for proceeds net of underwriting discounts and commissions and expenses of $3,018.  The Series B Preferred Stock is publicly traded on the New York Stock Exchange under the ticker symbol “AI PrB.”

The Series B Preferred Stock has no stated maturity, is not subject to any sinking fund and will remain outstanding indefinitely unless repurchased or redeemed by the Company. Holders of Series B Preferred Stock have no voting rights, except under limited conditions, and are entitled to receive a cumulative cash dividend at a rate of 7.00% per annum of their $25.00 per share liquidation preference before holders of common stock are entitled to receive any dividends. Shares of Series B Preferred Stock are redeemable at $25.00 per share, plus accumulated and unpaid dividends (whether or not authorized or declared) exclusively at our option commencing on May 12, 2022 or earlier upon the occurrence of a change in control. Dividends are payable quarterly in arrears on the 30th day of each December, March, June and September. As of September 30, 2017, we had declared and paid all required quarterly dividends on our Series B Preferred Stock.

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Common Stock Dividends

Pursuant to the Company’s variable dividend policy for its common stock, the Board of Directors evaluates common stock dividends on a quarterly basis and, in its sole discretion, approves the payment of dividends. The Company’s common stock dividend payments, if any, may vary significantly from quarter to quarter. The Board of Directors has approved and the Company has declared and paid the following dividends on its common stock to date in 2017:

Quarter Ended	Dividend Amount		Declaration Date	Record Date	Pay Date
September 30	$	0.550	September 14	September 29	October 31
June 30		0.550	June 16	June 30	July 31
March 31		0.625	March 14	March 31	April 28

The Board of Directors approved and the Company declared and paid the following dividends for 2016:

Quarter Ended	Dividend Amount		Declaration Date	Record Date	Pay Date
December 31	$	0.625	December 16	December 30	January 31, 2017
September 30		0.625	September 15	September 30	October 31
June 30		0.625	June 17	June 30	July 29
March 31		0.625	March 15	March 31	April 29

Equity Distribution Agreements

On May 24, 2013, the Company entered into separate equity distribution agreements (the “Prior Equity Distribution Agreements”) with each of RBC Capital Markets, LLC, JMP Securities LLC, Ladenburg Thalmann & Co. Inc. and MLV & Co. LLC (the “Prior Equity Sales Agents”), pursuant to which the Company may offer and sell, from time to time, up to 1,750,000 shares of the Company’s Class A common stock. Pursuant to the Prior Equity Distribution Agreements, shares of the Company’s common stock may be offered and sold through the Prior Equity Sales Agents in transactions that are deemed to be “at the market” offerings as defined in Rule 415 under the Securities Act of 1933, including sales made directly on the NYSE or sales made to or through a market maker other than on an exchange or, subject to the terms of a written notice from the Company, in privately negotiated transactions.  

During the three months ended March 31, 2017, the Company issued 800 shares of Class A common stock at a weighted average public offering price of $15.16 per share for proceeds net of underwriting discounts and commissions and expenses of $12 under the Prior Equity Distribution Agreements.  On February 23, 2017, the Company terminated the Prior Equity Distribution Agreements.

On February 22, 2017, the Company entered into new separate equity distribution agreements (the “New Equity Distribution Agreements”) with each of JMP Securities LLC, FBR Capital Markets & Co., JonesTrading Institutional Services LLC and Ladenburg Thalmann & Co. Inc. (the “New Equity Sales Agents”), pursuant to which the Company may offer and sell, from time to time, up to 6,000,000 shares of the Company’s Class A common stock. Pursuant to the New Equity Distribution Agreements, shares of the Company’s common stock may be offered and sold through the New Equity Sales Agents in transactions that are deemed to be “at the market” offerings as defined in Rule 415 under the Securities Act of 1933, including sales made directly on the NYSE or sales made to or through a market maker other than on an exchange or, subject to the terms of a written notice from the Company, in privately negotiated transactions.

The following table provides information about the issuances of common stock under the New Equity Distribution Agreements:

Class A Common Stock Issuances	Three Months Ended September 30, 2017		Nine Months Ended September 30, 2017
Shares issued		2,037,348		4,368,837
Weighted average public offering price	$	13.21	$	13.90
Net proceeds (1)	$	26,567	$	59,901

(1) Net of selling commissions and expenses.

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As of September 30, 2017, the Company had 1,631,163 shares of Class A common stock available for sale under the New Equity Distribution Agreements.

On May 16, 2017, the Company entered into an equity distribution agreement (the “Series B Preferred Equity Distribution Agreement”) with JonesTrading Institutional Services LLC (the “Series B Preferred Equity Agent”), pursuant to which the Company may offer and sell, from time to time, up to 1,865,000 shares of the Company’s Series B Preferred Stock. Pursuant to the Series B Preferred Equity Distribution Agreement, shares of the Company’s Series B Preferred stock may be offered and sold through the Series B Preferred Equity Sales Agent in transactions that are deemed to be “at the market” offerings as defined in Rule 415 under the Securities Act of 1933, including sales made directly on the NYSE or sales made to or through a market maker other than on an exchange or, subject to the terms of a written notice from the Company, in privately negotiated transactions.

The following table provides information about the issuances of preferred stock under the Series B Preferred Equity Distribution Agreement:

Series B Preferred Stock Issuances	Three Months Ended September 30, 2017		Nine Months Ended September 30, 2017
Shares issued		138,683		159,993
Weighted average public offering price	$	25.03	$	24.95
Net proceeds (1)	$	3,404	$	3,886

(1) Net of selling commissions and expenses.

As of September 30, 2017, the Company had 1,705,007 shares of Series B Preferred stock available for sale under the Series B Preferred Equity Distribution Agreement.

Share Repurchase Program

The Company’s Board of Directors authorized a share repurchase program pursuant to which the Company may repurchase up to 2,000,000 shares of Class A common stock (the “Repurchase Program”). Repurchases under the Repurchase Program may be made from time to time on the open market and in private transactions at management’s discretion in accordance with applicable federal securities laws. The timing of repurchases and the exact number of shares of Class A common stock to be repurchased will depend upon market conditions and other factors. The Repurchase Program is funded using the Company’s cash on hand and cash generated from operations. The Repurchase Program has no expiration date and may be suspended or terminated at any time without prior notice. As of September 30, 2017, there remain available for repurchase 1,951,305 shares of Class A common stock under the Repurchase Program.

Shareholder Rights Agreement

The Board of Directors adopted and the Company’s shareholders approved a shareholder rights agreement (“Rights Plan”). Under the terms of the Rights Plan, in general, if a person or group acquires or commences a tender or exchange offer for beneficial ownership of 4.9% or more of the outstanding shares of our Class A common stock upon a determination by our Board of Directors (an “Acquiring Person”), all of our other Class A and Class B common shareholders will have the right to purchase securities from us at a discount to such securities’ fair market value, thus causing substantial dilution to the Acquiring Person.

The Board of Directors adopted the Rights Plan in an effort to protect against a possible limitation on the Company’s ability to use its NOL carry-forwards, NCL carry-forwards, and built-in losses under Sections 382 and 383 of the Code. The Company’s ability to use its NOLs, NCLs and built-in losses would be limited if it experienced an “ownership change” under Section 382 of the Code. In general, an “ownership change” would occur if there is a cumulative change in the ownership of the Company’s common stock of more than 50% by one or more “5% shareholders” during a three-year period. The Rights Plan was adopted to dissuade any person or group from acquiring 4.9% or more of the Company’s outstanding Class A common stock, each, an Acquiring Person, without the approval of the Board of Directors and triggering an “ownership change” as defined by Section 382.

The Rights Plan and any outstanding rights will expire at the earliest of (i) June 4, 2019, (ii) the time at which the rights are redeemed or exchanged pursuant to the Rights Plan, (iii) the repeal of Section 382 and 383 of the Code or any successor statute if the

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Board of Directors determines that the Rights Plan is no longer necessary for the preservation of the applicable tax benefits, and (iv) the beginning of a taxable year to which the Board of Directors determines that no applicable tax benefits may be carried forward.

Note 12. Revisions to Previously Reported Financial Statements

During the second quarter of 2017, the Company concluded that the previously reported deferred tax assets, net, and accumulated deficit were incorrect for the three months ended March 31, 2017 and for the five fiscal years ended December 31, 2016 with a corresponding effect on the previously reported income tax benefit and net income for the fiscal year ended December 31, 2012. Although the impact of this change was not material to the consolidated financial statements for the five fiscal years ended December 31, 2016 and for the three months ended March 31, 2017, the Company has revised its previously reported consolidated financial statements for those periods to reflect the cumulative impact of the errors. The following tables set forth the affected line items within the Company’s previously reported consolidated financial statements for the periods indicated:

	As of March 31, 2017
	As Previously Reported			Adjustment			As Revised
Consolidated Balance Sheets:
Deferred tax assets, net	$	65,149		$	(24,603	)	$	40,546
Total assets		4,720,492			(24,603	)		4,695,889
Accumulated deficit		(1,536,949	)		(24,603	)		(1,561,552	)
Total stockholders' equity		374,481			(24,603	)		349,878
Total liabilities and stockholders' equity		4,720,492			(24,603	)		4,695,889

	As of December 31, 2016
	As Previously Reported			Adjustment			As Revised
Consolidated Balance Sheets:
Deferred tax assets, net	$	73,432		$	(24,603	)	$	48,829
Total assets		4,141,554			(24,603	)		4,116,951
Accumulated deficit		(1,527,104	)		(24,603	)		(1,551,707	)
Total stockholders' equity		383,416			(24,603	)		358,813
Total liabilities and stockholders' equity		4,141,554			(24,603	)		4,116,951

	As of December 31, 2015
	As Previously Reported			Adjustment			As Revised
Consolidated Balance Sheets:
Deferred tax assets, net	$	97,530		$	(24,603	)	$	72,927
Total assets		4,202,939			(24,603	)		4,178,336
Accumulated deficit		(1,426,655	)		(24,603	)		(1,451,258	)
Total stockholders' equity		484,031			(24,603	)		459,428
Total liabilities and stockholders' equity		4,202,939			(24,603	)		4,178,336

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Unless the context otherwise requires or provides, references in this Quarterly Report on Form 10-Q to “we,” “us,” “our” and the “Company” refer to Arlington Asset Investment Corp. (“Arlington Asset”) and its subsidiaries. This discussion and analysis should be read in conjunction with our financial statements and accompanying notes included in Item 1 of this Quarterly Report on Form 10-Q, as well as our audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2016.

The discussion of our consolidated financial condition and results of operations below may contain forward-looking statements. These statements, which reflect management’s beliefs and expectations, are subject to risks and uncertainties that may cause actual results to differ materially. For a discussion of the risks and uncertainties that may affect our future results, please see “Cautionary Statement About Forward-Looking Information” in Item 3 of Part I of this Quarterly Report on Form 10-Q and the risk factors included in Item 1A of Part I of our Annual Report on Form 10-K for the year ended December 31, 2016.

Our Company

We are a principal investment firm that currently acquires and holds a levered portfolio of residential mortgage-backed securities (“MBS”), consisting of agency MBS and private-label MBS. Agency MBS include residential mortgage pass-through certificates for which the principal and interest payments are guaranteed by a U.S. government agency or government sponsored enterprise (“GSE”), such as the Federal National Mortgage Association (“Fannie Mae”) and the Federal Home Loan Mortgage Corporation (“Freddie Mac”). Private-label MBS, or non-agency MBS, include residential MBS that are not guaranteed by a GSE or the U.S. government. As of September 30, 2017, nearly all of our investment capital was allocated to agency MBS.

We leverage prudently our investment portfolio so as to increase potential returns to our shareholders. We fund our investments primarily through short-term financing arrangements, principally through repurchase agreements.  We enter into various hedging transactions to mitigate the interest rate sensitivity of our cost of borrowing and the value of our MBS portfolio.

We are a Virginia corporation and taxed as a C corporation for U.S. federal tax purposes. We are an internally managed company and do not have an external investment advisor.

Factors that Affect our Results of Operations and Financial Condition

Our business is materially affected by a variety of industry and economic factors, including:

• conditions in the global financial markets and economic conditions generally;

• changes in interest rates and prepayment rates;

• conditions in the residential real estate and mortgage markets;

• actions taken by the U.S. government, U.S. Federal Reserve, the U.S. Treasury and foreign central banks;

• changes in laws and regulations and industry practices; and

• other market developments.

Current Market Conditions and Trends

Up until mid-September 2017, weakening inflation expectations, waning likelihood of potential pro-economic growth policies, rising geopolitical risks from North Korea and uncertainty of the economic impact from hurricane damage contributed to market participants lowering their expectations that the Federal Reserve would be able to raise interest rates one more time this calendar year, which collectively led to a bond market rally. Although the Federal Reserve kept the target federal funds rate unchanged following its September 20 meeting, the markets generally viewed the Federal Reserve’s commentary as hawkish based on the Federal Reserve’s commitment to raising the target federal funds rate in the near future and beginning its balance sheet normalization policy in October, which drove interest rates higher following the meeting with significantly increased expectations for an additional rate hike.  Subsequent to September 30, 2017, a U.S. congressional path towards potential income tax reform has raised economic growth expectations driving interest rates higher.

During the third quarter of 2017, the 10-year U.S. Treasury rate rallied to a low of 2.04% in early September before ending at 2.33% as of September 30, 2017, a two basis point increase from June 30, 2017.  The U.S. Treasury rate curve continued to flatten during the third quarter as the spread between the 2-year and 10-year U.S. Treasury rate narrowed eight basis points.  The spread

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between 10-year U.S. Treasury rates and interest rate swaps tightenedmodestly by one basis point during the third quarter of 2017 with the 10-year swap rate ending at 2.29% on September 30, 2017. In this environment, the price of agency MBS outperformed U.S. Treasuries and interest rate swaps resulting in spread tightening.

On September 20, 2017, the Federal Open Market Committee (“FOMC”) announced that it was maintaining the target federal funds rate range at 1.00% to 1.25%.  The FOMC commented that recent storm-related disruptions and rebuilding will affect economic activity in the near term, but past experiences suggest that the storms are unlikely to materially alter the course of the national economy over the medium term.  In its September 20, 2017 statement, the FOMC stated that it continues to expect that, with gradual adjustments in the stance of monetary policy, economic activity will expand at a moderate pace, and labor market conditions will strengthen somewhat further.  The FOMC also stated that it continues to expect inflation to remain somewhat below 2% in the near term but to stabilize around 2% over the medium term.  The FOMC commented further that it expects that economic conditions will evolve in a manner that will warrant only gradual increases in the federal funds rate, and will likely remain, for some time, below levels that are expected to prevail in the longer run.  Based on federal fund futures prices, market participants currently believe that there is a greater than 80% chance that the FOMC will raise the targeted federal funds rate by 25 basis points in December 2017.  In its September 20, 2017 statement, the FOMC also commented that beginning in October 2017 it will initiate its previously announced balance sheet normalization program of gradually reducing its reinvestment of principal payments of U.S. Treasury securities and agency MBS. Under its balance sheet normalization policy, principal payments received by the Federal Reserve would be reinvested only to the extent they exceed gradually rising caps until the FOMC determines that the Federal Reserve is holding no more securities than necessary to implement monetary policy efficiently and effectively.  

The Chair of the Board of Governors of the Federal Reserve System has significant influence over monetary policy and is appointed by the U.S. President subject to confirmation by the U.S. Senate. The four-year term of the current Chair, Janet L. Yellen, ends on February 3, 2018.  By the end of the calendar year, President Trump is expected to nominate a Chair for a new four-year term and is considering several candidates, including Ms. Yellen.  The selection of the Chair is being carefully watched by the market, particularly as it relates to policy rate path and balance sheet normalization pace.  

Prepayment speeds in the residential mortgage market during the third quarter increased from the prior quarter driven by several periods of interest rate rallies over the last couple of quarters as well as continued home price appreciation and wage growth.  Looking forward, near term prepayment speeds are expected to moderate due to the current interest rate environment and normal seasonal impact.  

Housing prices continue to improve as evidenced by the S&P CoreLogic Case-Shiller U.S. National Home Price NSA index reporting a 5.9% annual gain in July 2017 and the overall index reaching a historical high.  Housing prices continue to rise faster than inflation as the demand for homes has exceeded the supply of homes driven by low inventories of new or existing homes for sale as well as affordable available financing from historically low mortgage rates.  Looking forward, housing prices are expected to face two contradicting challenges in the near future.  Rebuilding following hurricanes across Texas, Florida and other parts of the south are expected to lead to further housing supply pressures while Federal Reserve balance sheet normalization policies may push mortgage rates upwards.

The following table presents certain key market data as of the dates indicated:

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		September 30, 2016			December 31, 2016			March 31, 2017			June 30, 2017			September 30, 2017			Change - Third Quarter 2017
30-Year FNMA Fixed Rate MBS (1)
	3.0%	$	103.98		$	99.20		$	99.23		$	99.83		$	100.27		$	0.44
	3.5%		105.55			102.33			102.36			102.67			103.05			0.38
	4.0%		107.42			104.98			104.95			105.14			105.27			0.13
	4.5%		109.55			107.39			107.30			107.27			107.33			0.06
U.S. Treasury Rates (UST)
2-year UST			0.76	%		1.19	%		1.26	%		1.38	%		1.48	%		0.10	%
3-year UST			0.88	%		1.45	%		1.49	%		1.55	%		1.62	%		0.07	%
5-year UST			1.15	%		1.93	%		1.92	%		1.89	%		1.94	%		0.05	%
7-year UST			1.42	%		2.25	%		2.21	%		2.14	%		2.17	%		0.03	%
10-year UST			1.60	%		2.45	%		2.39	%		2.31	%		2.33	%		0.02	%
2-year UST to 10-year UST spread			0.84	%		1.26	%		1.13	%		0.93	%		0.85	%		(0.08	)%
Interest Rate Swap Rates
2-year swap			1.01	%		1.45	%		1.62	%		1.62	%		1.74	%		0.12	%
3-year swap			1.07	%		1.69	%		1.81	%		1.75	%		1.86	%		0.11	%
5-year swap			1.18	%		1.98	%		2.05	%		1.96	%		2.00	%		0.04	%
7-year swap			1.30	%		2.16	%		2.22	%		2.11	%		2.14	%		0.03	%
10-year swap			1.46	%		2.34	%		2.38	%		2.28	%		2.29	%		0.01	%
2-year swap to 2-year UST spread			0.25	%		0.26	%		0.36	%		0.24	%		0.26	%		0.02	%
10-year swap to 10-year UST spread			(0.14	)%		(0.11	)%		(0.01	)%		(0.03	)%		(0.04	)%		(0.01	)%
London Interbank Offered Rates (LIBOR)
1-month LIBOR			0.53	%		0.77	%		0.98	%		1.22	%		1.23	%		0.01	%
3-month LIBOR			0.85	%		1.00	%		1.15	%		1.30	%		1.33	%		0.03	%

⁽¹⁾ Generic 30-year FNMA TBA price information, sourced from Bloomberg, provided for illustrative purposes only and is not meant to be reflective of the fair value of securities held by the Company.

Recent Government Activity

Uncertainty over the new administration’s policies, together with questions regarding the administration’s ability to work with Congress in order to implement such policies, are likely to increase market and credit volatility over the remainder of 2017 and into 2018.  We expect vigorous debate and discussion in a number of areas, including residential housing and mortgage reform, taxation, fiscal policy, monetary policy and healthcare, to continue over the next few years; however, we cannot be certain if or when any specific proposal or policy might be announced, emerge from committee or be approved by Congress, and if so, what the effects on us may be.

Executive Summary

As of September 30, 2017, the Company’s book value was $13.71 per common share, an increase of 1.7% from $13.48 per common share as of June 30, 2017. The Company’s tangible book value, which is calculated as shareholders’ equity less the Company’s net deferred tax asset and the liquidation preference of all issued and outstanding shares of preferred stock, was $12.88 per common share as of September 30, 2017, an increase of 2.6% from $12.55 per common share as of June 30, 2017.  For the quarter ended September 30, 2017, the Company declared a dividend of $0.55 per common share, resulting in an annualized economic return of 28.0% measured as the change in tangible book value plus dividends declared during the quarter.

For the third quarter of 2017, the Company had net income of $0.85 per diluted common share compared to a net loss of $0.74 per diluted common share in the prior quarter.  The Company had non-GAAP core operating income of $0.52 per diluted common share for the third quarter of 2017 compared to $0.58 per diluted common share in the prior quarter. The third quarter 2017 net interest income and non-GAAP core operating income were impacted by higher prepayment speeds resulting in lower asset yields, lower weighted-average leverage and investment volumes and higher net funding costs.  For further information on the use of non-GAAP core operating income, see “Management’s Discussion and Analysis of Financial Condition and Results of Operation – Non-GAAP Core Operating Income.”

Since the Company’s fixed-rate agency MBS have generally been purchased at a premium to par value, high prepayments can have a negative impact on the Company’s asset yields and interest income, while slow prepayments can have a positive impact. The actual constant prepayment rate (“CPR”) for the Company’s agency MBS increased to 10.29% for the third quarter of 2017 from

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9.03% in the prior quarter.  The average agency MBS yield was 2.80% for the third quarter of 2017 compared to 2.85% for the second quarter of 2017.

The Company’s average cost of repurchase agreement funding during the quarter ended September 30, 2017 was 1.31%, an increase of 23 basis points from the prior quarter attributable primarily to the increase in benchmark short-term rates driven by the Federal Reserve 25 basis point rate increase in June 2017.  

As of September 30, 2017, the Company’s agency investment portfolio totaled $5,389 million, comprised of $3,994 million of specified agency MBS and $1,395 million of net long TBA agency MBS. During the third quarter of 2017, the Company increased its net long TBA agency MBS position while reducing its specified agency MBS position as the implied net interest rate spread return opportunity of TBA dollar rolls was moderately higher than the net spread returns of specified agency MBS financed with repurchase agreements.  During the third quarter of 2017, the Company lowered its allocation of agency MBS investments in 4.0% coupon securities while increasing its allocation towards lower 3.0% and 3.5% coupon securities to take advantage of higher expected return opportunities.  

The Company continues to maintain a substantial hedge position with the intent to protect the Company’s capital and earnings potential against increased interest rates over the long-term. As of September 30, 2017, the Company’s interest rate hedge position consisted primarily of interest rate swaps along with 10-year U.S. Treasury note futures.  The Company’s average notional of its interest rate swaps and 10-year U.S. Treasury futures as a percentage of its average repurchase agreement financing and TBA commitments increased to 78% for the quarter ended September 30, 3017 compared to 74% for the quarter ended June 30, 2017.  The Company’s weighted average net pay rate of its interest rate swap agreements was 0.47% during the third quarter of 2017 compared to 0.62% during the second quarter of 2017.

We believe our hedging strategy will continue to enable the Company to maintain an attractive return on its agency MBS portfolio in order to produce resilient and predictable net interest income and non-GAAP core operating income that supports attractive dividends to our shareholders. In a volatile interest rate and wider spread environment, this hedging strategy will likely result in a temporary decline in book value. However, the Company would expect temporary declines in book value to be recovered over time either through higher future spread earnings if spreads remain wide, or through a reversal of temporary declines in book value if future interest rate volatility is low and spreads narrow.  The consistent execution of our hedging strategy may also result in an increase in leverage during periods of temporary declines in book value or decreases in leverage during periods of temporary increases in book value.

The Company continues to utilize its tax benefits afforded to it as a C-corporation that allow it to shield substantially all of its income from the payment of cash taxes.  As of September 30, 2017, the Company had estimated NOL carry-forwards of $69.7 million, NCL carry-forwards of $309.8 million and alternative minimum tax (“AMT”) credit carry-forwards of $9.0 million.  From a GAAP accounting perspective, the Company had a net deferred tax asset of $23.5 million, or $0.83 per share, as of September 30, 2017.  As of September 30, 2017, the valuation allowance reflects a full valuation allowance against its deferred tax assets that are expected to be capital in tax nature while its remaining unreserved net deferred tax asset represents its deferred tax assets that are expected to be ordinary in tax nature.  

Portfolio Overview

The following table summarizes our MBS investment portfolio at fair value as of September 30, 2017 and December 31, 2016 (dollars in thousands):

	September 30, 2017		December 31, 2016
Specified agency MBS	$	3,994,515	$	3,909,452
Inverse interest-only agency MBS		—		1,923
Total agency MBS		3,994,515		3,911,375
Net long agency TBA dollar roll positions (1)		1,394,553		720,027
Total agency investment portfolio		5,389,068		4,631,402
Private-label MBS		—		1,173
Private-label interest-only MBS		54		93
Total private-label investment portfolio		54		1,266
Total MBS investment portfolio	$	5,389,122	$	4,632,668

⁽¹⁾ Represents the fair value of the agency MBS which underlie our TBA forward purchase and sale commitments executed as dollar roll transactions. In accordance with GAAP, our TBA forward purchase and sale commitments are reflected on the

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consolidated balance sheets as a component of “derivative assets, at fair value” and “derivative liabilities, at fair value,” with a collective net liability carrying value of $7,146and a net asset carrying value of $1,156 as of September 30, 2017 and December 31, 2016, respectively.

Agency MBS Investment Portfolio

Our specified agency MBS consisted of the following as of September 30, 2017 (dollars in thousands):

	Unpaid Principal Balance		Net Unamortized Purchase Premiums		Amortized Cost Basis		Net Unrealized Gain (Loss)			Fair Value		Market Price		Coupon			Weighted Average Expected Remaining Life
30-year fixed rate:
3.5%	$	1,276,307	$	61,850	$	1,338,157	$	(17,101	)	$	1,321,056	$	103.51		3.50	%		6.9
4.0%		2,379,630		137,540		2,517,170		6,242			2,523,412		106.04		4.00	%		6.1
4.5%		139,128		10,668		149,796		230			150,026		107.83		4.50	%		4.5
5.5%		20		—		20		1			21		111.73		5.50	%		5.6
Total/weighted-average	$	3,795,085	$	210,058	$	4,005,143	$	(10,628	)	$	3,994,515		105.25		3.85	%		6.3

	Unpaid Principal Balance		Net Unamortized Purchase Premiums		Amortized Cost Basis		Net Unrealized Gain (Loss)			Fair Value		Market Price		Coupon			Weighted Average Expected Remaining Life
Fannie Mae	$	1,853,391	$	102,395	$	1,955,786	$	(9,994	)	$	1,945,792	$	104.99		3.80	%	6.3
Freddie Mac		1,941,694		107,663		2,049,357		(634	)		2,048,723		105.51		3.90	%	6.3
Total/weighted-average	$	3,795,085	$	210,058	$	4,005,143	$	(10,628	)	$	3,994,515		105.25		3.85	%	6.3

The actual CPR for the Company’s agency MBS was 10.29% for the three months ended September 30, 2017. As of September 30, 2017, the Company’s agency MBS was comprised of securities specifically selected for their relatively lower propensity for prepayment, which includes approximately 90% in specified pools of low balance loans while the remainder includes specified pools of loans originated in certain geographical areas, loans refinanced through the U.S. Government sponsored Home Affordable Refinance Program (“HARP”) or with other characteristics selected for their relatively lower propensity for prepayment.

Our agency MBS investment portfolio also includes net long TBA positions, which are primarily the result of executing sequential series of “dollar roll” transactions that are settled on a net basis. In accordance with GAAP, we account for our net long TBA positions as derivative instruments.  Information about the Company’s net long TBA positions as of September 30, 2017 is as follows (dollars in thousands):

	Notional Amount:
	Net Long (Short)			Implied			Implied			Net Carrying
	Position (1)			Cost Basis (2)			Fair Value (3)			Amount (4)
3.0% coupon purchase commitments	$	200,000		$	202,258		$	200,563		$	(1,695	)
3.5% coupon purchase commitments		1,005,000			1,040,762			1,036,092			(4,670	)
4.0% coupon purchase commitments		250,000			263,929			263,164			(765	)
4.0% coupon sale commitments		(100,000	)		(105,250	)		(105,266	)		(16	)
Total net long agency TBA dollar roll positions	$	1,355,000		$	1,401,699		$	1,394,553		$	(7,146	)

⁽¹⁾ “Notional amount” represents the unpaid principal balance of the underlying agency MBS.

⁽²⁾ “Implied cost basis” represents the contractual forward price for the underlying agency MBS.

⁽³⁾ “Implied fair value” represents the current fair value of the underlying agency MBS.

⁽⁴⁾ “Net carrying amount” represents the difference between the implied cost basis and the current fair value of the underlying MBS. This amount is reflected on the Company’s consolidated balance sheets as a component of “derivative assets, at fair value” and “derivative liabilities, at fair value.”

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Economic Hedging Instruments

The Company attempts to hedge a portion of its exposure to interest rate fluctuations associated with its agency MBS primarily through the use of interest rate derivatives. Specifically, these interest rate derivatives are intended to economically hedge changes, attributable to changes in benchmark interest rates, in agency MBS fair values and future interest cash flows on the Company’s short-term financing arrangements. As of September 30, 2017, the interest rate derivative instruments primarily used by the Company were centrally cleared interest rate swap agreements, exchange-traded 10-year U.S. Treasury note futures and options on 10-year U.S. Treasury note futures, and options on agency MBS.

The Company’s interest rate swap agreements represent agreements to make semiannual interest payments based upon a fixed interest rate and receive quarterly variable interest payments based upon the prevailing three-month LIBOR on the date of reset. Information about the Company’s outstanding interest rate swap agreements in effect as of September 30, 2017 is as follows (dollars in thousands):

			Weighted-average:
	Notional Amount		Fixed Pay Rate			Variable Receive Rate			Net Receive (Pay) Rate			Remaining Life (Years)		Fair Value
Years to maturity:
Less than 3 years	$	1,300,000		1.26	%		1.32	%		0.06	%		1.7	$	447
3 to less than 7 years		700,000		1.87	%		1.32	%		(0.55	)%		4.1		844
7 to 10 years		1,600,000		1.90	%		1.32	%		(0.58	)%		8.5		1,963
Total / weighted-average	$	3,600,000		1.66	%		1.32	%		(0.34	)%		5.2	$	3,254

The Company also has forward-starting interest rate swap agreements as of September 30, 2017 which have effective dates in early October 2017 and mature two years from their respective effective dates. The effective dates of these forward-starting interest rate swap agreements were set to occur within reasonable proximity to the maturity dates of certain of the Company’s existing interest rate swap agreements, economically extending the life of the maturing instruments. Information about the Company’s forward-starting interest rate swap agreements as of September 30, 2017 is as follows (dollars in thousands):

			Weighted-average:
	Notional Amount		Fixed Pay Rate			Term After Effective Date (Years)		Fair Value
Effective in October 2017	$	250,000		1.12	%		2.0	$	94

In addition to interest rate swap agreements, the Company also has exchange-traded 10-year U.S. Treasury note futures that are short positions that mature on a quarterly basis. Upon the maturity date of these futures contracts in December 2017, the Company has the option to either net settle each contract in cash in an amount equal to the difference between the current fair value of the underlying 10-year U.S. Treasury note and the contractual sale price inherent to the futures contract, or to physically settle the contract by delivering the underlying 10-year U.S. Treasury note. Information about the Company’s outstanding 10-year U.S. Treasury note futures contracts as of September 30, 2017 is as follows (dollars in thousands):

Maturity Date	Notional Amount		Net Fair Value
December 2017	$	350,000	$	820

In addition to exchange-traded 10-year U.S. Treasury note futures, the Company purchases and sells exchange-traded options on 10-year U.S. Treasury note futures contracts with the objective of economically hedging a portion of the sensitivity of its investments in agency MBS to significant changes in interest rates.  The Company may purchase put options which provide the Company with the right to sell 10-year U.S. Treasury note futures to a counterparty, and the Company may also write call options that provide a counterparty with the option to buy 10-year U.S. Treasury note futures from the Company.  In order to limit its exposure on its interest rate derivative instruments from a significant decline in long-term interest rates, the Company may also purchase contracts that provide the Company with the option to buy, or call, 10-year U.S. Treasury note futures from a counterparty.  The options may be exercised at any time prior to their expiry, and if exercised, may be net settled in cash or through physical receipt or delivery of the underlying futures contracts. 

Information about the Company’s outstanding options on 10-year U.S. Treasury note futures contracts as of September 30, 2017 is as follows (dollars in thousands):

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	Notional Amount		Weighted-average Strike Price		Implied Strike Rate (1)			Net Fair Value
Purchased call options:
October 2017 expiration	$	150,000		133.0		1.49	%	$	1

⁽¹⁾ The implied strike rate is estimated based upon the weighted average strike price per option contract and the price of an equivalent 10-year U.S. Treasury note futures contract.

The Company may purchase put options which provide the Company with the right to sell TBA-eligible agency MBS to a counterparty at a fixed price in the event that agency MBS prices decline. The options can only be exercised at their expiry, and if exercised, may be net settled in cash or through physical delivery of the underlying agency MBS. Information about the Company’s outstanding options on agency MBS as of September 30, 2017 is as follows:

	Notional Amount		Weighted-average Strike Price		Underlying Agency MBS Coupon			Net Fair Value
Purchased put options:
October 2017 expiration	$	500,000		102.5		4.00	%	$	-
November 2017 expiration		200,000		103.5		4.00	%		8
Total / weighted average for purchased put options	$	700,000		102.8		4.00	%	$	8

Results of Operations

Net Interest Income

Net interest income determined in accordance with GAAP primarily represents the interest income recognized from our investments in specified agency MBS and private-label MBS (including the amortization of purchase premiums and accretion of purchase discounts), net of the interest expense incurred from repurchase agreement financing arrangements or other short- and long-term borrowing transactions. 

Net interest income determined in accordance with GAAP does not include TBA agency MBS dollar roll income, which we believe represents the economic equivalent of net interest income generated from our investments in non-specified fixed-rate agency MBS, nor does it include the implied net interest income or expense of our interest rate swap agreements, which are not designated as hedging instruments for financial reporting purposes. In our consolidated statements of comprehensive income prepared in accordance with GAAP, TBA agency MBS dollar roll income and the implied net interest income or expense incurred from our interest rate swap agreements are reported as a component of the overall periodic change in the fair value of derivative instruments within the line item “gain (loss) from derivative instruments, net” of the “investment gain (loss), net” section.

Investment Gain (Loss), Net

“Investment gain (loss), net” primarily consists of periodic changes in the fair value (whether realized or unrealized) of investments in MBS classified as trading securities, periodic changes in the fair value (whether realized or unrealized) of derivative instruments, gains (losses) realized upon the sale of investments in MBS classified as available-for-sale, and other-than-temporary impairment charges for investments in MBS classified as available-for-sale.

General and Administrative Expenses

“Compensation and benefits expense” includes base salaries, annual cash incentive compensation, and non-cash stock-based compensation. Annual cash incentive compensation is based on meeting estimated annual performance measures and discretionary components. Non-cash stock-based compensation includes expenses associated with stock-based awards granted to employees, including the Company’s performance share units to named executive officers that are earned only upon the attainment of Company performance measures over the relevant measurement period.

“Other general and administrative expenses” primarily consists of the following:

• professional services expenses, including accounting, legal, and consulting fees;

• insurance expenses, including liability and property insurance;

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• occupancy and equipment expense, including rental costs for our facilities, and depreciation and amortization of equipment and software;

• fees and commissions related to transactions in interest rate derivative instruments;

• Board of Director fees; and

• other operating expenses, including information technology expenses, business development costs, public company reporting expenses, proxy solicitation expenses, business licenses and taxes, office supplies and other miscellaneous expenses.

Three and nine months ended September 30, 2017 compared to the three and nine months ended September 30, 2016

The following table presents the net income available to common stock reported for the three and nine months ended September 30, 2017 and 2016, respectively (dollars in thousands, except per share amounts):

	Three Months Ended September 30,					Nine Months Ended September 30,
	2017			2016		2017			2016
Interest income	$	28,835		$	25,654	$	90,639		$	80,759
Interest expense		13,968			7,390		36,562			20,786
Net interest income		14,867			18,264		54,077			59,973
Investment gain (loss), net		13,368			20,722		(4,364	)		(38,115	)
General and administrative expenses		4,544			4,630		13,623			16,637
Income before income taxes		23,691			34,356		36,090			5,221
Income tax provision		823			15,543		25,896			5,132
Net income		22,868			18,813		10,194			89
Dividend on preferred stock		(83	)		—		(118	)		—
Net income available to common stock	$	22,785		$	18,813	$	10,076		$	89
Diluted earnings per common share	$	0.85		$	0.81	$	0.40		$	—
Weighted-average diluted common shares   outstanding		26,856			23,349		25,143			23,154

GAAP Net Interest Income

Net interest income determined in accordance with GAAP (“GAAP net interest income”) decreased $3.4 million, or 18.6%, from $18.3 million for the three months ended September 30, 2016 to $14.9 million for the three months ended September 30, 2017 and decreased $5.9 million, or 9.8%, from $60.0 million for the nine months ended September 30, 2016 to $54.1 million for the nine months ended September 30, 2017. The decrease from the comparative periods is primarily attributable to 62 and 43 basis point increases for the three and nine months ended September 30, 2017, respectively, in the average interest costs of our short-term secured financing arrangements due primarily to an increase in prevailing benchmark short-term interest rates, partially offset by an increase in the average balance and asset yields of our specified agency MBS.

The components of GAAP net interest income from our MBS portfolio, excluding interest expense on long-term unsecured debt, are summarized in the following tables for the periods indicated (dollars in thousands):

	Three Months Ended September 30,
	2017								2016
	Average		Income			Yield			Average		Income			Yield
	Balance		(Expense)			(Cost)			Balance		(Expense)			(Cost)
Agency MBS	$	4,104,083	$	28,771			2.80	%	$	3,683,418	$	23,917			2.60	%
Private-label MBS		127		2			6.20	%		57,240		1,655			11.57	%
Other		—		62						—		82
	$	4,104,210		28,835			2.81	%	$	3,740,658		25,654			2.74	%
Short-term secured debt	$	3,819,095		(12,748	)		(1.31	)%	$	3,519,719		(6,193	)		(0.69	)%
Net interest income/spread			$	16,087			1.50	%			$	19,461			2.05	%
Net interest margin							1.57	%							2.08	%

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	Nine Months Ended September 30,
	2017								2016
	Average		Income			Yield			Average		Income			Yield
	Balance		(Expense)			(Cost)			Balance		(Expense)			(Cost)
Agency MBS	$	4,253,432	$	90,454			2.84	%	$	3,537,307	$	72,980			2.75	%
Private-label MBS		1,009		82			10.78	%		96,983		7,437			10.22	%
Other		—		103						—		342
	$	4,254,441		90,639			2.84	%	$	3,634,290		80,759			2.96	%
Short-term secured debt	$	3,956,579		(32,921	)		(1.10	)%	$	3,392,078		(17,202	)		(0.67	)%
Net interest income/spread			$	57,718			1.74	%			$	63,557			2.29	%
Net interest margin							1.81	%							2.33	%

The effects of changes in the composition of our investments on our GAAP net interest income from our MBS investment activities are summarized below (dollars in thousands):

	Three Months Ended September 30, 2017									Nine Months Ended September 30, 2017
	vs.									vs.
	Three Months Ended September 30, 2016									Nine Months Ended September 30, 2016
	Rate			Volume			Total Change			Rate			Volume			Total Change
Agency MBS	$	2,123		$	2,731		$	4,854		$	2,700		$	14,774		$	17,474
Private-label MBS		(2	)		(1,651	)		(1,653	)		4			(7,359	)		(7,355	)
Other		(20	)		—			(20	)		(239	)		—			(239	)
Short-term secured debt		(6,028	)		(527	)		(6,555	)		(12,856	)		(2,863	)		(15,719	)
	$	(3,927	)	$	553		$	(3,374	)	$	(10,391	)	$	4,552		$	(5,839	)

Economic Net Interest Income

Economic net interest income, a non-GAAP financial measure, represents the interest income earned net of the interest expense incurred from all of our interest bearing financial instruments as well as the agency MBS which underlie, and are implicitly financed through, our TBA dollar roll transactions. Economic net interest income is comprised of the following: (i) net interest income determined in accordance with GAAP, (ii) TBA agency MBS “dollar roll” income, and (iii) net interest income or expense incurred from interest rate swap agreements. We believe that economic net interest income assists investors in understanding and evaluating the financial performance of the Company’s long-term-focused, net interest spread-based investment strategy, prior to the deduction of core general and administrative expenses. A full description of each of the three aforementioned components of economic net interest income is included within the “Non-GAAP Core Operating Income” section of this document.

The components of our economic net interest income are summarized in the following tables for the periods indicated (dollars in thousands):

	Three Months Ended September 30,
	2017								2016
	Average		Income			Yield			Average		Income			Yield
	Balance		(Expense)			(Cost)			Balance		(Expense)			(Cost)
Agency MBS	$	4,104,083	$	28,771			2.80	%	$	3,683,418	$	23,917			2.60	%
TBA dollar rolls (1)		1,225,131		6,424			2.10	%		861,686		5,321			2.47	%
Private-label MBS		127		2			6.20	%		57,240		1,655			11.57	%
Other		—		62						—		82
Short-term secured debt		3,819,095		(12,748	)		(1.31	)%		3,519,719		(6,193	)		(0.69	)%
Interest rate swaps (2)		3,561,667		(4,198	)		(0.47	)%		2,303,030		(5,126	)		(0.89	)%
Long-term unsecured debt		73,796		(1,220	)		(6.61	)%		73,573		(1,197	)		(6.51	)%
Economic net interest income/margin (3)			$	17,093			1.37	%			$	18,459			1.73	%

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	Nine Months Ended September 30,
	2017								2016
	Average		Income			Yield			Average		Income			Yield
	Balance		(Expense)			(Cost)			Balance		(Expense)			(Cost)
Agency MBS	$	4,253,432	$	90,454			2.84	%	$	3,537,307	$	72,980			2.75	%
TBA dollar rolls (1)		830,389		14,120			2.27	%		688,671		12,835			2.48	%
Private-label MBS		1,009		82			10.78	%		96,983		7,437			10.22	%
Other		—		103						—		342
Short-term secured debt		3,956,579		(32,921	)		(1.10	)%		3,392,078		(17,202	)		(0.67	)%
Interest rate swaps (2)		3,372,028		(14,900	)		(0.59	)%		1,876,106		(13,499	)		(0.96	)%
Long-term unsecured debt		73,749		(3,641	)		(6.58	)%		73,526		(3,584	)		(6.50	)%
Economic net interest income/margin (3)			$	53,297			1.49	%			$	59,309			1.98	%

(1) TBA dollar roll average balance (average cost basis) is based upon the contractual price of the initial TBA purchase trade of each individual series of dollar roll transactions.  TBA dollar roll income is net of implied financing costs.

(2) Interest rate swap cost represents the weighted average net pay rate in effect for the period.

(3) Economic net interest margin rate excludes interest on long-term unsecured debt.

The effects of changes in the composition of our investments on our economic net interest income from our MBS investment and related funding and hedging activities are summarized below (dollars in thousands):

	Three Months Ended September 30, 2017									Nine Months Ended September 30, 2017
	vs.									vs.
	Three Months Ended September 30, 2016									Nine Months Ended September 30, 2016
	Rate			Volume			Total Change			Rate			Volume			Total Change
Agency MBS	$	2,123		$	2,731		$	4,854		$	2,700		$	14,774		$	17,474
TBA dollar rolls		(1,141	)		2,244			1,103			(1,357	)		2,642			1,285
Private-label MBS		(2	)		(1,651	)		(1,653	)		4			(7,359	)		(7,355	)
Other		(20	)		—			(20	)		(239	)		—			(239	)
Short-term secured debt		(6,028	)		(527	)		(6,555	)		(12,856	)		(2,863	)		(15,719	)
Interest rate swaps		3,730			(2,802	)		928			9,362			(10,763	)		(1,401	)
Long-term unsecured debt		(19	)		(4	)		(23	)		(46	)		(11	)		(57	)
	$	(1,357	)	$	(9	)	$	(1,366	)	$	(2,432	)	$	(3,580	)	$	(6,012	)

Economic net interest income for the three and nine months ended September 30, 2017 decreased relative to the comparative periods from the prior year due primarily to:

• Higher financing costs of our short-term secured financing arrangements and implied TBA financing driven primarily by an increase in prevailing benchmark short-term interest rates, partially offset by higher variable leg receive rates on our interest rate swap agreements; and

• A higher ratio of the weighted average notional amount of interest rate swap agreements relative to the weighted average of our short-term secured borrowings and implied TBA financing balances within those periods (71% and 70% for the three and nine months ended September 30, 2017, respectively, as compared to 53% and 46% for the three and nine months ended September 30, 2016, respectively).  Within the 2016 periods, a greater proportion of our overall hedging instrument population was allocated to instruments other than interest rate swaps, such as 10-year U.S. Treasury note futures. The economic cost or benefit of hedging instruments other than interest rate swap agreements do not affect the computation of economic net interest income; accordingly, economic net interest income computed for the 2017 periods is not directly comparable to the amount computed for the 2016 periods.

Investment Gain (Loss), Net

As prevailing longer-term interest rates increase (decrease), the fair value of our investments in fixed rate agency MBS and TBA commitments generally decreases (increases).  Conversely, the fair value of our interest rate derivative hedging instruments increases (decreases) in response to increases (decreases) in prevailing interest rates.  While our interest rate derivative hedging instruments are designed to mitigate the sensitivity of the fair value of our agency MBS portfolio to fluctuations in interest rates, they are not generally designed to mitigate the sensitivity of our net book value to spread risk, which is the risk of an increase of the market spread between

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the yield on our agency MBS and the benchmark yield on U.S. Treasury securities or interest rate swaps.  Accordingly, irrespective of fluctuations in interest rates, an increase (decrease) in MBS spreads will generally result in the underperformance (outperformance) of agency MBS relative to interest rate hedging instruments.

The following table presents information about the gains and losses recognized due to the changes in the fair value of our agency MBS, TBA transactions, and interest rate derivative instruments for the periods indicated (dollars in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Gains on trading investments, net	$	13,996		$	2,468		$	25,632		$	81,083
TBA and specified agency MBS commitments, net:
TBA dollar roll income		6,424			5,321			14,120			12,835
Other gains from TBA and specified agency MBS    commitments, net		1,007			1,506			962			17,728
Total gains on TBA and specified agency MBS    commitments, net		7,431			6,827			15,082			30,563
Interest rate derivatives:
Net interest expense on interest rate swaps		(4,198	)		(5,126	)		(14,900	)		(13,499	)
Other (losses) gains from interest rate derivative   instruments, net		(3,805	)		13,495			(30,127	)		(137,009	)
Total (losses) gains on interest rate derivatives, net		(8,003	)		8,369			(45,027	)		(150,508	)
Realized gains on sale of available-for-sale investments, net		—			2,439			—			1,846
OTTI charges on available-for-sale securities		—			—			—			(1,737	)
Other, net		(56	)		619			(51	)		638
Investment gain (loss), net	$	13,368		$	20,722		$	(4,364	)	$	(38,115	)

During the three months ended September 30, 2017 and 2016, MBS spreads narrowed which resulted in the outperformance of our investments in agency MBS and TBA commitments relative to our interest rate hedging instruments.  During the nine months ended September 30, 2017 and 2016, MBS spreads widened which resulted in the underperformance of our investments in agency MBS and TBA commitments relative to our interest rate hedging instruments.  

General and Administrative Expenses

General and administrative expenses decreased by $0.1 million, or 2.2%, from $4.6 million for the three months ended September 30, 2016 to $4.5 million for the three months ended September 30, 2017. General and administrative expenses decreased by $3.0 million, or 18.1%, from $16.6 million for the nine months ended September 30, 2016 to $13.6 million for the nine months ended September 30, 2017.

Compensation and benefits expenses remained unchanged at $3.4 million for both the three months ended September 30, 2016 and 2017. Compensation and benefits expenses increased by $0.9 million, or 10.3%, from $8.8 million for the nine months ended September 30, 2016, to $9.7 million for the nine months ended September 30, 2017. The increase in compensation and benefits expenses for the nine months ended September 30, 2017 is mostly attributable to an increase in long-term performance oriented stock-based compensation.

Other general and administrative expenses decreased by $0.1 million, or 8.3%, from $1.2 million for the three months ended September 30, 2016 to $1.1 million for the three months ended September 30, 2017. Other general and administrative expenses decreased by $4.0 million, or 50.6%, from $7.9 million for the nine months ended September 30, 2016 to $3.9 million for the nine months ended September 30, 2017. The decrease in other general and administrative expenses for the nine months ended September 30, 2017 is attributable primarily to $4.0 million of non-recurring expenses incurred during the nine months ended September 30, 2016 stemming from the 2016 proxy contest that were in excess of the level of expenses normally incurred for an annual meeting of shareholders.

Income Tax Provision

We recognized an income tax provision of $0.8 million and $15.5 million for the three months ended September 30, 2017 and 2016, respectively. The income tax provision for the three months ended September 30, 2017 includes the effect of a decrease in the valuation allowance against the deferred tax assets of $8.4 million. We recognized an income tax provision of $25.9 million and $5.1 million for the nine months ended September 30, 2017 and 2016, respectively. The income tax provision for the nine months ended

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September 30, 2017 includes the effect of anincrease in the valuation allowance against the deferred tax assets of $11.5 million. As of September 30, 2017,the Company determined that it should record a full valuation allowance against its deferred tax assets that are capital in nature consisting of its NCL carry-forwards and temporary GAAP to tax differences thatare expected to result in capital losses in future periods.

A valuation allowance is provided against the deferred tax asset if, based on our evaluation, it is more-likely-than-not that some or all of the deferred tax assets will not be realized. All available evidence, both positive and negative, is considered in our determination for whether a valuation allowance for deferred tax assets is needed. Items considered in determining our valuation allowance include expectations of future earnings of the appropriate tax character, recent historical financial results, tax planning strategies, the length of statutory carry-forward periods and the expected timing of the reversal of temporary differences.

Non-GAAP Core Operating Income

In addition to the results of operations determined in accordance with generally accepted accounting principles as consistently applied in the United States (“GAAP”), we reported “non-GAAP core operating income.” We define core operating income as “economic net interest income” less “core general and administrative expenses.”

Economic Net Interest Income

Economic net interest income, a non-GAAP financial measure, represents the interest income earned net of the interest expense incurred from all of our interest bearing financial instruments as well as the agency MBS which underlie, and are implicitly financed through, our TBA dollar roll transactions. Economic net interest income is comprised of the following: periodic (i) net interest income determined in accordance with GAAP, (ii) TBA agency MBS “dollar roll” income, and (iii) net interest income or expense incurred from interest rate swap agreements.

We believe that economic net interest income assists investors in understanding and evaluating the financial performance of the Company’s long-term-focused, net interest spread-based investment strategy, prior to the deduction of core general and administrative expenses.

• Net interest income determined in accordance with GAAP.  Net interest income determined in accordance with GAAP primarily represents the interest income recognized from our investments in specified agency MBS and private-label MBS (including the amortization of purchase premiums and accretion of purchase discounts), net of the interest expense incurred from repurchase agreement financing arrangements or other short- and long-term borrowing transactions.

• TBA agency MBS dollar roll income.  Dollar roll income represents the economic equivalent of net interest income (implied interest income net of financing costs) generated from our investments in non-specified fixed-rate agency MBS, executed through sequential series of forward-settling purchase and sale transactions that are settled on a net basis (known as “dollar roll” transactions). Dollar roll income is generated as a result of delaying, or “rolling,” the settlement of a forward-settling purchase of a TBA agency MBS by entering into an offsetting “spot” sale prior to the settlement date, net settling the “paired-off” positions in cash, and contemporaneously entering another forward-settling purchase of a TBA agency MBS of the same essential characteristics for a later settlement date at a price discount relative to the spot sale. The price discount of the forward-settling purchase relative to the contemporaneously executed spot sale reflects compensation for the interest income (inclusive of expected prepayments) that, at the time of sale, is expected to be foregone as a result of relinquishing beneficial ownership of the MBS from the settlement date of the spot sale until the settlement date of the forward purchase, net of implied repurchase financing costs. We calculate dollar roll income as the excess of the spot sale price over the forward-settling purchase price, and recognize this amount ratably over the period beginning on the settlement date of the sale and ending on the settlement date of the forward purchase. In our consolidated statements of comprehensive income prepared in accordance with GAAP, TBA agency MBS dollar roll income is reported as a component of the overall periodic change in the fair value of TBA forward commitments within the line item “gain (loss) from derivative instruments, net” of the “investment gain (loss), net” section.

• Net interest income earned or expense incurred from interest rate swap agreements. We utilize interest rate swap agreements to economically hedge a portion of our exposure to variability in future interest cash flows, attributable to changes in benchmark interest rates, associated with future roll-overs of our short-term financing arrangements. Accordingly, the net interest income earned or expense incurred (commonly referred to as “net interest carry”) from our interest rate swap agreements in combination with interest expense recognized in accordance with GAAP represents our effective “economic interest expense.” In our consolidated statements of comprehensive income prepared in accordance with GAAP, the net interest income earned or expense incurred from interest rate swap agreements is reported as a component of the overall

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periodic change in the fair value of derivative instruments within the line item “gain (loss) from derivative instruments, net” of the “investment gain (loss), net” section.

Core General and Administrative Expenses

Core general and administrative expenses are non-interest expenses reported within the line item “total general and administrative expenses” of the consolidated statements of comprehensive income less stock-based compensation expense. For the nine months ended September 30, 2016, core general and administrative expenses also exclude non-recurring expenses related to the 2016 proxy contest that are in excess of those normally incurred for an annual meeting of shareholders.

Non-GAAP Core Operating Income

The following table presents our computation of non-GAAP core operating income for the three and nine months ended September 30, 2017 and 2016 (amounts in thousands, except per share amounts):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
GAAP net interest income	$	14,867		$	18,264		$	54,077		$	59,973
TBA dollar roll income		6,424			5,321			14,120			12,835
Interest rate swap net interest expense		(4,198	)		(5,126	)		(14,900	)		(13,499	)
Economic net interest income		17,093			18,459			53,297			59,309
Core general and administrative expenses		(3,171	)		(3,612	)		(10,876	)		(10,476	)
Preferred stock dividend		(83	)		—			(118	)		—
Non-GAAP core operating income	$	13,839		$	14,847		$	42,303		$	48,833
Non-GAAP core operating income per diluted    common share	$	0.52		$	0.64		$	1.68		$	2.11
Weighted average diluted common shares    outstanding		26,856			23,349			25,143			23,154

The following table provides a reconciliation of GAAP pre-tax net income (loss) to non-GAAP core operating income for the three and nine months ended September 30, 2017 and 2016 (amounts in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
GAAP income before income taxes	$	23,691		$	34,356		$	36,090		$	5,221
Less:
Total investment (gain) loss, net		(13,368	)		(20,722	)		4,364			38,115
Stock-based compensation expense		1,373			1,018			2,747			2,182
Non-recurring proxy contest related expenses		—			—			—			3,979
Preferred stock dividend		(83	)		—			(118	)		—
Add back:
TBA dollar roll income		6,424			5,321			14,120			12,835
Interest rate swap net interest expense		(4,198	)		(5,126	)		(14,900	)		(13,499	)
Non-GAAP core operating income	$	13,839		$	14,847		$	42,303		$	48,833

Non-GAAP core operating income is used by management to evaluate the financial performance of the Company’s long-term-focused, net interest spread-based investment strategy and core business activities over periods of time as well as assist with the determination of the appropriate level of periodic dividends to common stockholders. In addition, we believe that non-GAAP core operating income assists investors in understanding and evaluating the financial performance of the Company’s long-term-focused, net interest spread-based investment strategy and core business activities over periods of time as well as its earnings capacity.

Periodic fair value gains and losses recognized with respect to our investments in MBS and our economic hedging instruments, which are reported in line item “total investment gain (loss), net” of our consolidated statements of comprehensive income, are excluded from the computation of non-GAAP core operating income as such gains on losses are not reflective of the economic interest income earned or interest expense incurred from our interest-bearing financial assets and liabilities during the indicated reporting period.  Because our long-term-focused investment strategy for our agency MBS investment portfolio is to generate a net interest

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spread on the leveraged assets while prudently hedging periodic changes in the fair value of those assets attributable to changes in benchmark interest rates, we generally expect the fluctuations in the fair value of our agency MBS investments and our economic hedging instruments to largely offset one another over time.

A limitation of utilizing this non-GAAP financial measure is that the effect of accounting for “non-core” events or transactions in accordance with GAAP does, in fact, reflect the financial results of our business and these effects should not be ignored when evaluating and analyzing our financial results. For example, the economic cost or benefit of hedging instruments other than interest rate swap agreements, such as U.S. Treasury note futures or options, do not affect the computation of non-GAAP core operating income. Therefore, we believe that non-GAAP core operating income should be considered as a supplement to, and in conjunction with, net income and comprehensive income determined in accordance with GAAP.

Liquidity and Capital Resources

Liquidity is a measurement of our ability to meet potential cash requirements including ongoing commitments to repay borrowings, fund investments, meet margin calls on our short-term borrowings and hedging instruments, and for other general business purposes. Our primary sources of funds for liquidity consist of existing cash balances, short-term borrowings (for example, repurchase agreements), principal and interest payments from our investments in MBS, and proceeds from sales of MBS. Other sources of liquidity include proceeds from the offering of common stock, preferred stock, debt securities, or other securities registered pursuant to our effective shelf registration statement filed with the Securities and Exchange Commission (“SEC”).

Liquidity, or ready access to funds, is essential to our business. Perceived liquidity issues may affect our counterparties’ willingness to engage in transactions with us. Our liquidity could be impaired due to circumstances that we may be unable to control, such as a general market disruption or an operational problem that affects us or third parties. Further, our ability to sell assets may be impaired if other market participants are seeking to sell similar assets at the same time. If we cannot obtain funding from third parties or from our subsidiaries, our results of operations could be negatively impacted.

As of September 30, 2017, our debt-to-equity leverage ratio was 9.6 to 1 measured as the ratio of the sum of our total debt to our shareholders’ equity as reported on our consolidated balance sheet.  In evaluating our liquidity and leverage ratios, we also monitor our “at risk” short-term financing to investable capital ratio. Our “at risk” short-term financing to investable capital ratio is measured as the ratio of the sum of our short-term recourse financing (i.e. repurchase agreement financing), net payable or receivable for unsettled securities, net contractual forward price of our TBA commitments less our cash and cash equivalents compared to our investable capital.  Our investable capital is calculated as the sum of our tangible stockholders’ equity and long-term unsecured debt. Tangible stockholders’ equity is measured as our stockholders’ equity less our net deferred tax asset, and our long-term unsecured debt is measured as our long-term unsecured debt excluding any unamortized issuance costs.  As of September 30, 2017, our “at risk” short-term recourse financing to investable capital ratio was 11.2 to 1.  

Cash Flows

As of September 30, 2017, our cash and cash equivalents totaled $26.4 million, representing a net decrease of $28.4 million from $54.8 million as of December 31, 2016. Cash provided by operating activities of $64.9 million during the nine months ended September 30, 2017 was attributable primarily to net interest income less our general and administrative expenses. Cash used in investing activities of $161.6 million during the nine months ended September 30, 2017 was primarily generated by purchases of new agency MBS and payments for settlements and deposits for margin calls on our interest rate derivative instruments, partially offset by sales of agency MBS and the receipt of principal payments from agency MBS. Cash provided by financing activities of $68.3 million during the nine months ended September 30, 2017 relates primarily to net proceeds obtained from repurchase agreements used to finance a portion of our MBS investment portfolio and proceeds received from issuance of common and preferred stock, partially offset by dividend payments to stockholders.

Sources of Funding

We believe that our existing cash balances, net investments in MBS, cash flows from operations, borrowing capacity, and other sources of liquidity will be sufficient to meet our cash requirements for at least the next twelve months. We may, however, seek debt or equity financings, in public or private transactions, to provide capital for corporate purposes and/or strategic business opportunities, including possible acquisitions, joint ventures, alliances or other business arrangements which could require substantial capital outlays. Our policy is to evaluate strategic business opportunities, including acquisitions and divestitures, as they arise. There can be no assurance that we will be able to generate sufficient funds from future operations, or raise sufficient debt or equity on acceptable terms, to take advantage of investment opportunities that become available. Should our needs ever exceed these sources of liquidity,

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we believe that most of our investments could be sold, in most circumstances, to provide cash. However, we may be required to sell our assets in such instances at depressed prices.

As of September 30, 2017, liquid assets consisted primarily of cash and cash equivalents of $26.4 million and net investments in MBS of $370.7 million. Cash equivalents consist primarily of money market funds invested in debt obligations of the U.S. government. The Company’s net investments in MBS is calculated as the sum of the Company’s total MBS investments at fair value and receivable for sold MBS, less the sum of the repurchase agreements outstanding and payable for purchased MBS.

Debt Capital

Long-Term Unsecured Debt

As of September 30, 2017, we had $73.8 million of total long-term unsecured debt, net of unamortized debt issuance costs of $1.5 million. Our trust preferred debt obligations with an aggregate principal amount of $15.0 million outstanding as of September 30, 2017 accrue and require the payment of interest quarterly at three-month LIBOR plus 2.25% to 3.00% and mature between 2033 and 2035. Our 6.625% Senior Notes due 2023 with a principal amount of $25.0 million outstanding as of September 30, 2017 accrue and require payment of interest quarterly at an annual rate of 6.625% and mature on May 1, 2023. Our 6.75% Senior Notes due 2025 with a principal amount of $35.3 million outstanding as of September 30, 2017 accrue and require payment of interest quarterly at an annual rate of 6.75% and mature on March 15, 2025.

Repurchase Agreements

We have short-term financing facilities that are structured as repurchase agreements with various financial institutions to fund our investments in MBS. We have obtained, and believe we will be able to continue to obtain, short-term financing in amounts and at interest rates consistent with our financing objectives. Funding for MBS through repurchase agreements continues to be available to us at rates we consider to be attractive from multiple counterparties.

Our repurchase agreements include provisions contained in the standard master repurchase agreement as published by the Securities Industry and Financial Markets Association (“SIFMA”) and may be amended and supplemented in accordance with industry standards for repurchase facilities. Our repurchase agreements include financial covenants, with which the failure to comply would constitute an event of default under the applicable repurchase agreement. Similarly, each repurchase agreement includes events of insolvency and events of default on other indebtedness as similar financial covenants. As provided in the standard master repurchase agreement as typically amended, upon the occurrence of an event of default or termination, the applicable counterparty has the option to terminate all repurchase transactions under such counterparty’s repurchase agreement and to demand immediate payment of any amount due from us to the counterparty.

Under our repurchase agreements, we may be required to pledge additional assets to our repurchase agreement counterparties in the event the estimated fair value of the existing pledged collateral under such agreements declines and such lenders demand additional collateral (commonly referred to as a “margin call”), which may take the form of additional securities or cash. Margin calls on repurchase agreements collateralized by our MBS investments primarily result from events such as declines in the value of the underlying mortgage collateral caused by factors such as rising interest rates or prepayments. Our repurchase agreements generally provide that valuations for MBS securing our repurchase agreements are to be obtained from a generally recognized source agreed to by both parties.  However, in certain circumstances and under certain of our repurchase agreements, our lenders have the sole discretion to determine the value of the MBS securing our repurchase agreements. In such instances, our lenders are required to act in good faith in making determinations of value. Our repurchase agreements generally provide that in the event of a margin call, we must provide additional securities or cash on the same business day that the margin call is made if the lender provides us notice prior to the margin notice deadline on such day.

To date, we have not had any margin calls on our repurchase agreements that we were not able to satisfy with either cash or additional pledged collateral. However, should we encounter increases in interest rates or prepayments, margin calls on our repurchase agreements could result in a material adverse change in our liquidity position.

Our repurchase agreements generally mature within 30 to 60 days, but may have maturities as short as one day and as long as one year. In the event that market conditions are such that we are unable to continue to obtain repurchase agreement financing for our investments in MBS in amounts and at interest rates consistent with our financing objectives, we may liquidate such investments and may incur significant losses on any such sales of MBS.

In the event that market conditions are such that we are unable to obtain financing for our investments in MBS in amounts and at interest rates consistent with our financing objectives, to the extent deemed appropriate, we may use cash to finance our investments

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or we may liquidate such investments. Accordingly, depending upon market conditions, we may incur significant losses on any such sales of MBS.

The following table provides information regarding our outstanding repurchase agreement borrowings as of dates and periods indicated (dollars in thousands):

	September 30, 2017			December 31, 2016
Pledged with agency MBS:
Repurchase agreements outstanding	$	3,694,838		$	3,649,102
Agency MBS collateral, at fair value		3,873,154			3,851,269
Net amount (1)		178,316			202,167
Weighted-average rate		1.33	%		0.96	%
Weighted-average term to maturity	11.9 days			19.3 days
Maximum amount outstanding at any month-end    during the period	$	4,292,755		$	3,653,114

⁽¹⁾ Net amount represents the value of collateral in excess of corresponding repurchase obligation. The amount of collateral at-risk is limited to the outstanding repurchase obligation and not the entire collateral balance.

To limit our exposure to counterparty risk, we diversify our repurchase agreement funding across multiple counterparties and by counterparty region. As of September 30, 2017, we had outstanding repurchase agreement balances with 16 counterparties and have master repurchase agreements in place with a total of 19 counterparties located throughout North America, Europe and Asia. As of September 30, 2017, no more than 5.3% of our stockholders’ equity was at risk with any one counterparty, with the top five counterparties representing approximately 21.6% of our stockholders’ equity. The table below includes a summary of our repurchase agreement funding by number of counterparties and counterparty region as of September 30, 2017 (dollars in thousands):

	Number of		Percentage of Repurchase
	Counterparties		Agreement Funding
North America		11		71.8	%
Europe		1		7.9	%
Asia		4		20.3	%
		16		100.0	%

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Derivative Instruments

In the normal course of our operations, we are a party to financial instruments that are accounted for as derivative financial instruments including (i) interest rate derivative instruments such as interest rate swaps, Eurodollar futures, interest rate swap futures, U.S. Treasury note futures, put and call options on U.S. Treasury note futures, and options on agency MBS, and (ii) derivative instruments that economically serve as investments such as TBA contracts.

Interest Rate Derivative Instruments

We exchange cash variation margin with the counterparties to our interest rate derivative instruments at least on a daily basis based upon daily changes in fair value as measured by the central clearinghouse through which those derivatives are cleared. In addition, the central clearinghouse requires market participants to deposit and maintain an “initial margin” amount which is determined by the clearinghouse and is generally intended to be set at a level sufficient to protect the clearinghouse from the maximum estimated single-day price movement in that market participant’s contracts. The clearing exchanges have the sole discretion to determine the value of derivative instruments.  In the event of a margin call, we must generally provide additional collateral on the same business day. To date, we have not had any margin calls on our derivative agreements that we were not able to satisfy. However, if we encounter significant decreases in long-term interest rates, margin calls on our derivative agreements could result in a material adverse change in our liquidity position.

As of September 30, 2017, we had outstanding interest rate swaps, 10-year U.S. Treasury note futures, and options on 10-year U.S. Treasury note futures with the following aggregate notional amount, net fair value and corresponding margin held in collateral deposit with the custodian (in thousands):

	September 30, 2017
	Notional		Net Fair		Collateral
	Amount		Value		Deposit
Interest rate swaps (1)	$	3,850,000	$	3,348	$	49,518
U.S. Treasury note futures and options on U.S. Treasury note futures		500,000		821		4,035

⁽¹⁾ Beginning in 2017, the Company accounts for the daily receipt or payment of cash variation margin associated with centrally cleared interest rate swaps as a legal settlement of the derivative instrument itself, as opposed to the pledge of collateral.

TBA Dollar Roll Transactions

TBA dollar roll transactions represent a form of off-balance sheet financing accounted for as derivative instruments.  In a TBA dollar roll transaction, we do not intend to take physical delivery of the underlying agency MBS and will generally enter into an offsetting position and net settle the paired off position in cash.  However, under certain market conditions, it may be uneconomical for us to roll our TBA contracts into future months and we may need to take or make physical delivery of the underlying securities. If we were required to take physical delivery to settle a long TBA contract, we would have to fund our total purchase commitment with cash or other financing sources and our liquidity position could be negatively impacted.

Our TBA contracts and, beginning in the latter half of 2017 as a result of amended regulatory requirements provided by the Financial Industry Regulatory Authority, our commitments to purchase and sell specified agency MBS are subject to master securities forward transaction agreements published by SIFMA as well as supplemental terms and conditions with each counterparty.  Under the terms of these agreements, we may be required to pledge collateral to our counterparty in the event the fair value of our agency MBS commitments decline and such counterparty demands collateral through a margin call.  Margin calls on agency MBS commitments are generally caused by factors such as rising interest rates or prepayments.  Our agency MBS commitments provide that valuations for our commitments and any pledged collateral are to be obtained from a generally recognized source agreed to by both parties.  However, in certain circumstances, our counterparties have the sole discretion to determine the value of the agency MBS commitment and any pledged collateral. In such instances, our counterparties are required to act in good faith in making determinations of value.  In the event of a margin call, we must generally provide additional collateral on the same business day.

Equity Capital

Preferred Stock

In May 2017, the Company completed a public offering in which 135,000 shares of its 7.00% Series B Cumulative Perpetual Redeemable Preferred Stock (the “Series B Preferred Stock”) were issued to the public at a public offering price of $24.00 per share

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for proceeds net of underwriting discounts and commissions and expenses of $3.0 million.  The Series B Preferred Stock is publicly traded on the New York Stock Exchange under the ticker symbol “AI PrB”.

The Series B Preferred Stock has no stated maturity, is not subject to any sinking fund and will remain outstanding indefinitely unless repurchased or redeemed by the Company. Holders of Series B Preferred Stock have no voting rights, except under limited conditions, and are entitled to receive a cumulative cash dividend at a rate of 7.00% per annum of their $25.00 per share liquidation preference before holders of common stock are entitled to receive any dividends. Shares of Series B Preferred Stock are redeemable at $25.00 per share, plus accumulated and unpaid dividends (whether or not authorized or declared) exclusively at our option commencing on May 12, 2022 or earlier upon the occurrence of a change in control. Dividends are payable quarterly in arrears on the 30th day of each December, March, June and September. As of September 30, 2017, we had declared and paid all required quarterly dividends on our Series B Preferred Stock.

Equity Distribution Agreements

On May 24, 2013, we entered into separate equity distribution agreements (the “Prior Equity Distribution Agreements”) with each of RBC Capital Markets, LLC, JMP Securities LLC, Ladenburg Thalmann & Co. Inc. and MLV & Co. LLC (the “Prior Equity Sales Agents”), pursuant to which we may offer and sell, from time to time, up to 1,750,000 shares of our Class A common stock. Pursuant to the Prior Equity Distribution Agreements, shares of our common stock may be offered and sold through the Prior Equity Sales Agents in transactions that are deemed to be “at the market” offerings as defined in Rule 415 under the Securities Act of 1933 as amended (the “Securities Act”), including sales made directly on the NYSE or sales made to or through a market maker other than on an exchange or, subject to the terms of a written notice from us, in privately negotiated transactions.  

During the three months ended March 31, 2017, we issued 800 shares of Class A common stock at a weighted average public offering price of $15.16 per share for proceeds net of underwriting discounts and commissions and expenses of $12 thousand under the Prior Equity Distribution Agreements.  On February 23, 2017, we terminated the Prior Equity Distribution Agreements.

On February 22, 2017, we entered into new separate equity distribution agreements (the “New Equity Distribution Agreements”) with each of JMP Securities LLC, FBR Capital Markets & Co., JonesTrading Institutional Services LLC and Ladenburg Thalmann & Co. Inc. (the “New Equity Sales Agents”), pursuant to which we may offer and sell, from time to time, up to 6,000,000 shares of our Class A common stock. Pursuant to the New Equity Distribution Agreements, shares of our common stock may be offered and sold through the New Equity Sales Agents in transactions that are deemed to be “at the market” offerings as defined in Rule 415 under the Securities Act, including sales made directly on the NYSE or sales made to or through a market maker other than on an exchange or, subject to the terms of a written notice from us, in privately negotiated transactions. During the nine months ended September 30, 2017, we issued 4,368,837 shares of Class A common stock at a weighted average public offering price of $13.90 per share for proceeds net of selling commissions and expenses of $59.9 million under the New Equity Distribution Agreements.

As of September 30, 2017, we had 1,631,163 shares of Class A common stock available for sale under the New Equity Distribution Agreements.

On May 16, 2017, we entered into a new separate equity distribution agreement (the “Series B Preferred Equity Distribution Agreement”) with JonesTrading Institutional Services LLC (the “Series B Preferred Equity Agent”), pursuant to which we may offer and sell, from time to time, up to 1,865,000 shares of our Series B Preferred Stock. Pursuant to the Series B Preferred Equity Distribution Agreement, shares of our Series B Preferred stock may be offered and sold through the Series B Preferred Equity Sales Agent in transactions that are deemed to be “at the market” offerings as defined in Rule 415 under the Securities Act of 1933, including sales made directly on the NYSE or sales made to or through a market maker other than on an exchange or, subject to the terms of a written notice from us, in privately negotiated transactions. During the nine months ended September 30, 2017, we issued 159,993 shares of Series B Preferred stock at a weighted average public offering price of $24.95 per share for proceeds net of selling commissions and expenses of $3.9 million under the Series B Preferred Equity Distribution Agreement.

As of September 30, 2017, we had 1,705,007 shares of Series B Preferred stock available for sale under the Series B Preferred Equity Distribution Agreement

Share Repurchase Program

The Company’s Board of Directors authorized a share repurchase program pursuant to which the Company may repurchase up to 2.0 million shares of its Class A common stock. As of September 30, 2017, 1,951,305 shares of Class A common stock remained available for repurchase under the repurchase program.  

Off-Balance Sheet Arrangements

As of September 30, 2017 and December 31, 2016, we did not have any relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance, or special purpose or variable interest entities (“VIEs”),

47

established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes. Our economic interests held in unconsolidated VIEs are limited in nature to those of a passive holder of MBS issued by a securitization trust. As of September 30, 2017 and December 31, 2016, we had not consolidated for financial reporting purposes any securitization trusts as we do not have the power to direct the activities that most significantly impact the economic performance of such entities. Further, as of September 30, 2017 and December 31, 2016, we had not guaranteed any obligations of unconsolidated entities or entered into any commitment or intent to provide funding to any such entities.

Item 3. Quantitative and Qualitative Disclosures about Market Risk

Market risk is the exposure to loss resulting from changes in market factors such as interest rates, foreign currency exchange rates, commodity prices, equity prices and other market changes that affect market risk sensitive instruments. The primary market risks that we are exposed to are interest rate risk, prepayment risk, extension risk, credit risk, spread risk, liquidity risk and regulatory risk. See “Item 1 — Business” in our Annual Report on Form 10-K for the year ended December 31, 2016 for a description of our risk management strategies.

Interest Rate Risk

We are exposed to interest rate risk in our MBS portfolio. Our investments in MBS are financed with short-term borrowing facilities such as repurchase agreements, which are interest rate sensitive financial instruments. Our exposure to interest rate risk fluctuates based upon changes in the level and volatility of interest rates, mortgage prepayments, and in the shape and slope of the yield curve, among other factors. Through the use of interest rate derivative instruments, we attempt to economically hedge a portion of our exposure to changes, attributable to changes in benchmark interest rates, in certain MBS fair values and future interest cash flows on our short-term financing arrangements. Our primary interest rate derivatives include interest rate swaps as well as U.S. Treasury note futures, options on U.S. Treasury note futures, and options on agency MBS. Historically, we have also utilized Eurodollar futures and interest rate swap futures.

Changes in both short- and long-term interest rates affect us in several ways, including our financial position. As interest rates increase, the fair value of fixed-rate agency MBS may be expected to decline, prepayment rates may be expected to decrease and duration may be expected to extend. However, an increase in interest rates results in an increase in the fair value of our interest rate derivative instruments. Conversely, if interest rates decline, the fair value of fixed-rate agency MBS is generally expected to increase while the fair value of our interest rate derivatives is expected to decline.

The tables that follow illustrate the estimated change in fair value for our current investments in agency MBS and derivative instruments under several hypothetical scenarios of interest rate movements. For the purposes of this illustration, interest rates are defined by the U.S. Treasury yield curve. Changes in fair value are measured as percentage changes from their respective fair values presented in the column labeled “Value.” Our estimate of the change in the fair value of agency MBS is based upon the same assumptions we use to manage the impact of interest rates on the portfolio. The interest rate sensitivity of our agency MBS and TBA commitments is derived from The Yield Book, a third-party model. Actual results could differ significantly from these estimates. The effective durations are based on observed fair value changes, as well as our own estimate of the effect of interest rate changes on the fair value of the investments, including assumptions regarding prepayments based, in part, on age and interest rate of the mortgages underlying the MBS, prior exposure to refinancing opportunities, and an overall analysis of historical prepayment patterns under a variety of historical interest rate conditions.

The interest rate sensitivity analyses illustrated by the tables that follow have certain limitations, most notably the following:

• The 50 and 100 basis point upward and downward shocks to interest rates that are applied in the analyses represent parallel shocks to the forward yield curve. The analyses do not consider the sensitivity of stockholders’ equity to changes in the shape or slope of the forward yield curve.

• The analyses assume that spreads remain constant and, therefore, do not reflect an estimate of the impact that changes in spreads would have on the value of our MBS investments or our LIBOR-based derivative instruments, such as our interest rate swap agreements.

• The analyses assume a static portfolio and do not reflect activities and strategic actions that management may take in the future to manage interest rate risk in response to significant changes in interest rates or other market conditions.

• The yield curve that results from applying an instantaneous parallel 100 basis point decrease in interest rates may reflect an interest rate of less than 0% in certain portions of the curve. The results of the analysis included in the applicable tables to follow reflect the effect of these negative interest rates.

• The analyses do not reflect any estimated changes in the fair value of our investments in private-label MBS.

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• The analyses do not reflect any changes in the value of our net deferred tax asset, including any changes to the assumptions that would be incorporated into the determination of the deferred tax asset valuation allowance.

These analyses are not intended to provide a precise forecast. Actual results could differ materially from these estimates (dollars in thousands, except per share amounts):

	September 30, 2017
				Value			Value
				with 50			with 50
				Basis Point			Basis Point
				Increase in			Decrease in
	Value			Interest Rates			Interest Rates
Agency MBS	$	3,994,515		$	3,902,198		$	4,059,237
TBA commitments		(7,146	)		(42,697	)		16,030
10-year U.S. Treasury note futures		820			14,521			(12,883	)
Interest rate swaps		3,348			89,780			(83,086	)
Options on MBS		8			4,235			—
Options on U.S. Treasury note futures		1			—			107
Equity available to common stock		385,197			361,690			373,057
Book value per common share	$	13.71		$	12.87		$	13.28
Book value per common share percent change					(6.10	)%		(3.15	)%

	September 30, 2017
				Value			Value
				with 100			with 100
				Basis Point			Basis Point
				Increase in			Decrease in
	Value			Interest Rates			Interest Rates
Agency MBS	$	3,994,515		$	3,791,400		$	4,096,513
TBA commitments		(7,146	)		(84,987	)		28,435
10-year U.S. Treasury note futures		820			28,222			(26,584	)
Interest rate swaps		3,348			176,213			(169,519	)
Options on MBS		8			17,266			—
Options on U.S. Treasury note futures		1			—			1,430
Equity available to common stock		385,197			321,767			323,928
Book value per common share	$	13.71		$	11.45		$	11.53
Book value per common share percent change					(16.47	)%		(15.91	)%

Spread Risk

Our investments in MBS expose us to “spread risk.”  Spread risk, also known as “basis risk,” is the risk of an increase in the spread between market participants’ required rate of return (or “market yield”) on our MBS and prevailing benchmark interest rates, such as the U.S. Treasury or interest rate swap rates.

The spread risk inherent to our investments in agency MBS and the resulting fluctuations in fair value of these securities can occur independent of changes in prevailing benchmark interest rates and may relate to other factors impacting the mortgage and fixed income markets, such as actual or anticipated monetary policy actions by the U. S. Federal Reserve, liquidity, or changes in market participants’ required rates of return on different assets. While we use interest rate derivative instruments to attempt to mitigate the sensitivity of our net book value to changes in prevailing benchmark interest rates, such instruments are generally not designed to mitigate spread risk inherent to our investment in agency MBS. Consequently, the value of our agency MBS and, in turn, our net book value, could decline independent of changes in interest rates.

The tables that follow illustrate the estimated change in fair value for our investments in agency MBS and TBA commitments under several hypothetical scenarios of agency MBS spread movements. Changes in fair value are measured as percentage changes from their respective fair values presented in the column labeled “Value.” The sensitivity of our agency MBS and TBA commitments to changes in MBS spreads is derived from The Yield Book, a third-party model. The analysis to follow reflects an assumed spread duration for our investment in agency MBS of 5.4 years, which is a model-based assumption that is dependent upon the size and composition of our investment portfolio as well as economic conditions present as of September 30, 2017.

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These analyses are not intended to provide a precise forecast. Actual results could differ materially from these estimates (dollars in thousands, except per share amounts).

	September 30, 2017
				Value with			Value with
				10 Basis Point			10 Basis Point
				Increase in			Decrease In
				Agency MBS			Agency MBS
	Value			Spreads			Spreads
Agency MBS	$	3,994,515		$	3,972,950		$	4,016,080
TBA commitments, net		(7,146	)		(14,754	)		461
Options on Agency MBS		8			1,670			—
Equity available to common stock		385,197			357,686			414,361
Book value per common share	$	13.71		$	12.73		$	14.75
Book value per common share percent change					(7.14	)%		7.57	%

	September 30, 2017
				Value with			Value with
				25 Basis Point			25 Basis Point
				Increase in			Decrease In
				Agency MBS			Agency MBS
	Value			Spreads			Spreads
Agency MBS	$	3,994,515		$	3,940,602		$	4,048,428
TBA commitments, net		(7,146	)		(26,165	)		11,872
Options on Agency MBS		8			2,585			—
Equity available to common stock		385,197			314,842			458,120
Book value per common share	$	13.71		$	11.21		$	16.31
Book value per common share percent change					(18.26	)%		18.93	%

Inflation

Virtually all of our assets and liabilities are interest rate sensitive in nature. As a result, interest rates and other factors influence our performance far more than inflation. Changes in interest rates do not necessarily correlate with inflation rates or changes in inflation rates. Our financial statements are prepared in accordance with GAAP and our distributions are determined by our Board of Directors in its sole discretion pursuant to our variable dividend policy; in each case, our activities and balance sheet are measured with reference to fair value without considering inflation.

Cautionary Statement About Forward-Looking Information

When used in this Quarterly Report on Form 10-Q, in future filings with the Securities and Exchange Commission (“SEC”) or in press releases or other written or oral communications, statements which are not historical in nature, including those containing words such as “believe,” “expect,” “anticipate,” “estimate,” “plan,” “continue,” “intend,” “should,” “may” or similar expressions, are intended to identify “forward-looking statements” within the meaning of Section 27A of the Securities Act and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and, as such, may involve known and unknown risks, uncertainties and assumptions. The forward-looking statements we make in this Quarterly Report on Form 10-Q include, but are not limited to, statements about the following:

• the availability and terms of, and our ability to deploy, capital and our ability to grow our business through our current strategy focused on acquiring primarily residential mortgage-backed securities (“MBS”) that are either issued by U.S. government agencies or guaranteed as to principal and interest by U.S. government agencies or U.S. government sponsored agencies (“agency MBS”), and MBS issued by private organizations (“private-label MBS”);

• our ability to forecast our tax attributes, which are based upon various facts and assumptions, and our ability to protect and use our net operating losses (“NOLs”) and net capital losses (“NCLs”) to offset future taxable income, including whether our shareholder rights plan (“Rights Plan”) will be effective in preventing an ownership change that would significantly limit our ability to utilize such losses;

• our business, acquisition, leverage, asset allocation, operational, investment, hedging and financing strategies and the success of these strategies;

50

• the effect of changes in prepayment rates, interest rates and default rates on our portfolio;

• the effect of governmental regulation and actions on our business, including, without limitation, changes to monetary and fiscal policy and tax laws;

• our ability to quantify and manage risk;

• our ability to roll our repurchase agreements on favorable terms, if at all;

• our liquidity;

• our asset valuation policies;

• our decisions with respect to, and ability to make, future dividends;

• investing in assets other than MBS or pursuing business activities other than investing in MBS;

• our ability to maintain our exclusion from the definition of “investment company” under the Investment Company Act of 1940, as amended (the “1940 Act”);

• our decision to not elect to be taxed as a real estate investment trust (“REIT”) under the Internal Revenue Code; and

• the effect of general economic conditions on our business.

Forward-looking statements are based on our beliefs, assumptions and expectations of our future performance, taking into account information currently in our possession. These beliefs, assumptions and expectations may change as a result of many possible events or factors, not all of which are known to us or are within our control. If a change occurs, the performance of our portfolio and our business, financial condition, liquidity and results of operations may vary materially from those expressed, anticipated or contemplated in our forward-looking statements. You should carefully consider these risks, along with the following factors that could cause actual results to vary from our forward-looking statements, before making an investment in our securities:

• the overall environment for interest rates, changes in interest rates, interest rate spreads, the yield curve and prepayment rates, including the timing of increases in the Federal Funds rate by the U.S. Federal Reserve;

• current conditions and further adverse developments in the residential mortgage market and the overall economy;

• potential risk attributable to our mortgage-related portfolios, including changes in fair value;

• our use of leverage and our dependence on repurchase agreements and other short-term borrowings to finance our mortgage-related holdings;

• the availability of certain short-term liquidity sources;

• competition for investment opportunities, including competition from the U.S. Department of Treasury (“U.S. Treasury”) and the U.S. Federal Reserve, for investments in agency MBS, as well as the effects of the termination by the U.S. Federal Reserve of its purchases of agency MBS;

• the federal conservatorship of the Federal National Mortgage Association (“Fannie Mae”) and the Federal Home Loan Mortgage Corporation (“Freddie Mac”) and related efforts, along with any changes in laws and regulations affecting the relationship between Fannie Mae and Freddie Mac and the federal government;

• mortgage loan prepayment activity, modification programs and future legislative action;

• changes in, and success of, our acquisition, hedging and leverage strategies, changes in our asset allocation and changes in our operational policies, all of which may be changed by us without shareholder approval;

• failure of sovereign or municipal entities to meet their debt obligations or a downgrade in the credit rating of such debt obligations;

• fluctuations of the value of our hedge instruments;

• fluctuating quarterly operating results;

• changes in laws and regulations and industry practices that may adversely affect our business;

• volatility of the securities markets and activity in the secondary securities markets in the United States and elsewhere;

• our ability to successfully expand our business into areas other than investing in MBS and our expectations of the returns of expanding into any such areas; and

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• the other important factors identified in this Quarterly Report on Form 10-Q and our Annual Report on Form 10-K for the year ended December 31, 2016 under the caption “Item 1A — Risk Factors”.

These and other risks, uncertainties and factors, including those described elsewhere in this Quarterly Report on Form 10-Q, could cause our actual results to differ materially from those projected in any forward-looking statements we make. All forward-looking statements speak only as of the date on which they are made. New risks and uncertainties arise over time and it is not possible to predict those events or how they may affect us. Except as required by law, we are not obligated to, and do not intend to, update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Item 4. Controls and Procedures

Conclusion Regarding the Effectiveness of Disclosure Controls and Procedures

As of the end of the period covered by this Quarterly Report on Form 10-Q, our management, with the participation of our Chief Executive Officer, J. Rock Tonkel, Jr., and our Chief Financial Officer, Richard E. Konzmann, carried out an evaluation of the effectiveness of our disclosure controls and procedures (as defined under Rule 13a-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) pursuant to Rule 13a-15(b) of the Exchange Act. Based upon that evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures are effective to ensure that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding disclosure.

Changes in Internal Control Over Financial Reporting

There have been no changes in our internal control over financial reporting that occurred during the quarter ended September 30, 2017 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II

OTHER INFORMATION

Item 1. Legal Proceedings

We are from time to time involved in civil lawsuits, legal proceedings and arbitration matters that we consider to be in the ordinary course of our business. There can be no assurance that these matters individually or in the aggregate will not have a material adverse effect on our financial condition or results of operations in a future period. We are also subject to the risk of litigation, including litigation that may be without merit. As we intend to actively defend such litigation, significant legal expenses could be incurred. An adverse resolution of any future litigation against us could materially affect our financial condition, results of operations and liquidity. Furthermore, we operate in highly-regulated markets that currently are under intense regulatory scrutiny, and we have received, and we expect in the future that we may receive, inquiries and requests for documents and information from various federal, state and foreign regulators. In addition, one or more of our subsidiaries have received requests to repurchase loans from various parties in connection with the former securitization business conducted by a subsidiary. We believe that the continued scrutiny of MBS, structured finance, and derivative market participants increases the risk of additional inquiries and requests from regulatory or enforcement agencies and other parties. We cannot provide any assurance that these inquiries and requests will not result in further investigation of or the initiation of a proceeding against us or that, if any such investigation or proceeding were to arise, it would not materially adversely affect our Company.

Item 1A. Risk Factors

None.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Purchases of Equity Securities by the Issuer

None.

Item 3. Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

Not applicable.

Item 5. Other Information

None.

Item 6. Exhibits

Exhibit Number	Exhibit Title
3.01	Amended and Restated Articles of Incorporation, as amended (incorporated by reference to Exhibit 3.1 to the Registrant’s Quarterly Report on Form 10-Q filed on November 9, 2009).
3.02	Articles of Amendment to the Amended and Restated Articles of Incorporation designating the shares of 7.00% Series B Cumulative Perpetual Redeemable Preferred Stock, $0.01 par value per share (incorporated by reference to Exhibit 3.2 to the Company’s Registration Statement on Form 8-A filed on May 9, 2017).
3.03	Amended and Restated Bylaws, as amended (incorporated by reference to Exhibit 3.1 to the Registrant’s Current Report on Form 8-K filed on July 28, 2011).
3.04	Amendment No. 1 to the Amended and Restated Bylaws (incorporated by reference to Exhibit 3.1 to the Registrant’s Current Report on Form 8-K filed on February 4, 2015).
3.05	Amendment No. 2 to the Amended and Restated Bylaws (incorporated by reference to Exhibit 3.1 to the Registrant’s Current Report on Form 8-K filed on October 26, 2016).

53

Exhibit Number	Exhibit Title
4.01	Form of Indenture governing the Senior Debt Securities by and between the Company and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 4.1 to the Company’s Registration Statement on Form S-3 (File No. 333-215384) filed on December 30, 2016).
4.02	Form of Indenture governing the Subordinated Debt Securities by and between the Company and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 4.2 to the Company’s Registration Statement on Form S-3 (File No. 333-215384) filed on December 30, 2016).
4.03	Indenture dated as of May 1, 2013 between the Company and Wells Fargo Bank, National Association, as trustee (incorporated by reference to Exhibit 4.1 of the Company’s Current Report on Form 8-K filed on May 1, 2013).
4.04	First Supplemental Indenture dated as of May 1, 2013 between the Company and Wells Fargo Bank, National Association, as trustee (incorporated by reference to Exhibit 4.2 of the Company’s Current Report on Form 8-K filed on May 1, 2013).
4.05	Form of Senior Note (incorporated by reference to Exhibit 4.5 to the Company’s Registration Statement on Form S-3 (File No. 333-215384) filed on December 30, 2016).
4.06	Form of Subordinated Note (incorporated by reference to Exhibit 4.6 to the Company’s Registration Statement on Form S-3 (File No. 333-215384) filed on December 30, 2016).
4.07	Form of 6.625% Senior Notes due 2023 (incorporated by reference to Exhibit 4.3 to Current Report on Form 8-K filed by the Company on May 1, 2013).
4.08	Form of Certificate for Class A common stock (incorporated by reference to Exhibit 4.01 of the Annual Report on Form 10-K filed with the SEC on February 24, 2010).
4.09	Shareholder Rights Agreement, dated June 5, 2009 (incorporated by reference to Exhibit 4.1 of the Current Report on Form 8-K filed with the SEC on June 5, 2009).
4.10	Second Supplemental Indenture, dated as of March 18, 2015, between the Company, Wells Fargo Bank, National Association, as Trustee and The Bank of New York Mellon, as Series Trustee (incorporated by reference to Exhibit 4.3 to the Company’s Form 8-A filed on March 18, 2015).
4.11	Form of 6.750% Notes due 2025 (incorporated by reference to Exhibit 4.3 to the Current Report on Form 8-K filed by the Company on March 17, 2015).
4.12	Form of specimen certificate representing the shares of 7.00% Series B Perpetual Redeemable Preferred Stock (incorporated by reference to Exhibit 4.1 to the Company’s Registration Statement of Form 8-A filed on May 9, 2017).
10.01	Equity Distribution Agreement, dated May 16, 2017, by and between the Company and JonesTrading Institutional Services LLC (incorporated by reference to Exhibit 1.1 of the Registrant’s Current Report on Form 8-K filed on May 17, 2017).
12.01	Computation of Ratio of Earnings to Fixed Charges and Ratio of Earnings to Combined Fixed Charges and Preferred Stock Dividends.*
31.01	Certification of Chief Executive Officer pursuant to Rule 13a-14(a)/15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.*
31.02	Certification of Chief Financial Officer pursuant to Rule 13a-14(a)/15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.*
32.01	Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.**
32.02	Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.**
101.INS	INSTANCE DOCUMENT***
101.SCH	SCHEMA DOCUMENT***
101.CAL	CALCULATION LINKBASE DOCUMENT***
101.LAB	LABELS LINKBASE DOCUMENT***

54

Exhibit Number	Exhibit Title
101.PRE	PRESENTATION LINKBASE DOCUMENT***
101.DEF	DEFINITION LINKBASE DOCUMENT***

* Filed herewith.

** Furnished herewith.

*** Submitted electronically herewith. Attached as Exhibit 101 are the following materials from the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2017, formatted in XBRL (eXtensible Business Reporting Language): (i) Consolidated Balance Sheets at September 30, 2017 and December 31, 2016; (ii) Consolidated Statements of Comprehensive Income for the Three and Nine Months Ended September 30, 2017 and 2016; (iii) Consolidated Statements of Changes in Equity for the Nine Months Ended September 30, 2017 and the Year Ended December 31, 2016; and (iv) Consolidated Statements of Cash Flows for the Nine Months Ended September 30, 2017 and 2016.

55

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	ARLINGTON ASSET INVESTMENT CORP.
	By:	/s/ RICHARD E. KONZMANN
		Richard E. Konzmann
		Executive Vice President, Chief Financial Officer and Treasurer
		(Principal Financial Officer)
Date: November 3, 2017

56

EX-12.01

Exhibit 12.01

Computation of Ratio of Earnings to Fixed Charges and Ratio of Earnings to Combined Fixed Charges and Preferred Stock Dividends

(dollars in thousands)

	Nine Months
	Ended
	September 30,		Year Ended December 31,
	2017		2016			2015			2014		2013		2012
Ratio of earnings to fixed charges:
Pre-tax income (loss) available (attributable) to    common stock adjusted to exclude income or    loss from equity investees	$	35,928	$	(14,512	)	$	(32,403	)	$	55,189	$	14,253	$	30,788
Distributed income of equity investees		173		809			1,628			413		90		384
Fixed charges:
Interest expense and amortization of debt discount    and premium on all indebtedness		36,562		29,222			18,889			11,391		8,529		4,965
Rentals		66		87			92			83		81		88
Total fixed charges	$	36,628	$	29,309		$	18,981		$	11,474	$	8,610	$	5,053
Pre-tax income (loss) available (attributable) to    common stock adjusted to exclude income or    loss from equity investees plus fixed charges    and distributed income of equity investees	$	72,729	$	15,606		$	(11,794	)	$	67,076	$	22,953	$	36,225
Ratio of earnings to fixed charges		2.0	(A)			(A)				5.8		2.7		7.2

	Nine Months
	Ended
	September 30,		Year Ended December 31,
	2017		2016			2015			2014		2013		2012
Ratio of earnings to combined fixed charges and    preferred stock dividends:
Pre-tax income (loss) available (attributable) to    common stock adjusted to exclude income or    loss from equity investees	$	35,928	$	(14,512	)	$	(32,403	)	$	55,189	$	14,253	$	30,788
Distributed income of equity investees		173		809			1,628			413		90		384
Preferred stock dividends		118		-			-			-		-		-
Fixed charges:
Interest expense and amortization of debt discount    and premium on all indebtedness		36,562		29,222			18,889			11,391		8,529		4,965
Rentals		66		87			92			83		81		88
Total fixed charges	$	36,628	$	29,309		$	18,981		$	11,474	$	8,610	$	5,053
Pre-tax income (loss) available (attributable) to    common stock adjusted to exclude income or    loss from equity investees plus fixed charges,    distributed income of equity investees and    dividends on preferred stock	$	72,847	$	15,606		$	(11,794	)	$	67,076	$	22,953	$	36,225
Ratio of earnings to fixed charges		2.0	(A)			(A)				5.8		2.7		7.2

(A) For the years ended December 31, 2016 and 2015, the ratio coverage in the period was less than 1:1. The Company would have had to generate additional earnings of $13,703 and $30,775, respectively, to achieve coverage of 1:1 in those periods.

EX-31.01

Exhibit 31.01

CERTIFICATION

I, J. Rock Tonkel, Jr., certify that:

1. I have reviewed this Quarterly Report on Form 10-Q for the quarter ended September 30, 2017 of Arlington Asset Investment Corp.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 3, 2017	/s/ J. ROCK TONKEL, JR.
	J. Rock Tonkel, Jr. President and Chief Executive Officer (Principal Executive Officer)

EX-31.02

Exhibit 31.02

CERTIFICATION

I, Richard E. Konzmann, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q for the quarter ended September 30, 2017 of Arlington Asset Investment Corp.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 3, 2017	/s/ RICHARD E. KONZMANN
	Richard E. Konzmann Executive Vice President, Chief Financial Officer and Treasurer (Principal Financial Officer)

EX-32.01

Exhibit 32.01

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Arlington Asset Investment Corp. (the “Company”) for the period ended September 30, 2017, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, J. Rock Tonkel, Jr., Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that:

(1) the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 3, 2017	/s/ J. ROCK TONKEL, JR.
	J. Rock Tonkel, Jr.
	President and Chief Executive Officer (Principal Executive Officer)

EX-32.02

Exhibit 32.02

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Arlington Asset Investment Corp. (the “Company”) for the period ended September 30, 2017, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Richard E. Konzmann, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that:

(1) the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 3, 2017	/s/ RICHARD E. KONZMANN
	Richard E. Konzmann
	Executive Vice President,
	Chief Financial Officer and Treasurer
	(Principal Financial Officer)

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Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 31, 2017
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Entity Registrant Name	Arlington Asset Investment Corp.
Entity Central Index Key	0001209028
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Trading Symbol	AI
Common Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		28,140,721

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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 26,368	$ 54,794
Interest receivable	12,428	11,646
Sold securities receivable	92,882
Derivative assets, at fair value	4,177	74,889
Deferred tax assets, net	23,453	48,829
Deposits, net	59,317	11,149
Other assets	2,405	3,003
Total assets	4,215,599	4,116,951
Liabilities:
Repurchase agreements	3,694,838	3,649,102
Interest payable	2,813	3,434
Accrued compensation and benefits	4,210	5,406
Dividend payable	17,044	15,739
Derivative liabilities, at fair value	7,146	9,554
Purchased securities payable	21,962
Other liabilities	1,190	1,247
Long-term unsecured debt	73,824	73,656
Total liabilities	3,823,027	3,758,138
Commitments and contingencies
Stockholders’ Equity:
Preferred stock, $0.01 par value, 25,000,000 shares authorized, 294,993 and -0- shares issued and outstanding, respectively (liquidation preference of $7,375 and $-0-, respectively)	6,904
Additional paid-in capital	1,972,463	1,910,284
Accumulated deficit	(1,587,075)	(1,551,707)
Total stockholders’ equity	392,572	358,813
Total liabilities and stockholders’ equity	4,215,599	4,116,951
Private-Label MBS
ASSETS
Mortgage-backed securities, at fair value	54	1,266
Agency MBS
ASSETS
Mortgage-backed securities, at fair value	3,994,515	3,911,375
Liabilities:
Repurchase agreements	3,694,838	3,649,102
Common Class A
Stockholders’ Equity:
Common stock	280	236
Common Class B
Stockholders’ Equity:
Common stock	$ 0	$ 0

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	25,000,000	25,000,000
Preferred stock, issued (in shares)	294,993	0
Preferred stock, outstanding (in shares)	294,993	0
Preferred stock, liquidation preference	$ 7,375	$ 0
Common Class A
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	450,000,000	450,000,000
Common stock, shares issued (in shares)	28,038,275	23,607,111
Common stock, shares outstanding (in shares)	28,038,275	23,607,111
Common Class B
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	0	20,256
Common stock, shares outstanding (in shares)	0	20,256

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest income
Other	$ 62	$ 82	$ 103	$ 342
Total interest income	28,835	25,654	90,639	80,759
Interest expense
Total interest expense	13,968	7,390	36,562	20,786
Net interest income	14,867	18,264	54,077	59,973
Investment gain (loss), net
Gain on trading investments, net	13,996	2,468	25,632	81,083
(Loss) gain from derivative instruments, net	(572)	15,196	(29,945)	(119,945)
Realized gain on sale of available-for-sale investments, net		2,439		1,846
Other-than-temporary impairment charges				(1,737)
Other, net	(56)	619	(51)	638
Total investment gain (loss), net	13,368	20,722	(4,364)	(38,115)
General and administrative expenses
Compensation and benefits	3,449	3,430	9,698	8,750
Other general and administrative expenses	1,095	1,200	3,925	7,887
Total general and administrative expenses	4,544	4,630	13,623	16,637
Income before income taxes	23,691	34,356	36,090	5,221
Income tax provision	823	15,543	25,896	5,132
Net income	22,868	18,813	10,194	89
Dividend on preferred stock	(83)		(118)
Net income available to common stock	$ 22,785	$ 18,813	$ 10,076	$ 89
Basic earnings per common share	$ 0.86	$ 0.82	$ 0.41
Diluted earnings per common share	$ 0.85	$ 0.81	$ 0.40
Weighted-average common shares outstanding (in thousands)
Basic	26,377	23,038	24,793	23,011
Diluted	26,856	23,349	25,143	23,154
Other comprehensive income (loss), net of taxes
Unrealized losses on available-for-sale securities (net of taxes of $-0-, $(141), $-0- and $(3,946), respectively)		$ (221)		$ (6,197)
Reclassification
Included in investment gain (loss), net, related to sales of available-for-sale securities (net of taxes of $-0-, $(639), $-0-, and $(783), respectively)		(2,324)		(2,550)
Included in investment gain (loss), net, related to other-than-temporary impairment charges on available-for-sale securities (net of taxes of $-0-, $-0-, $-0- and $676, respectively)				1,061
Comprehensive income (loss)	$ 22,868	16,268	$ 10,194	(7,597)
Unsecured Debt
Interest expense
Long-term debt	1,220	1,197	3,641	3,584
Secured Debt
Interest expense
Short-term debt	12,748	6,193	32,921	17,202
Agency MBS
Interest income
Mortgage-backed securities	28,771	23,917	90,454	72,980
Private-Label MBS
Interest income
Mortgage-backed securities	$ 2	$ 1,655	82	7,437
Investment gain (loss), net
Gain on trading investments, net			$ 57	$ 89

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Unrealized losses for the period on available-for-sale securities, taxes	$ 0	$ (141)	$ 0	$ (3,946)
Included in investment gain (loss), net, related to sales of available-for-sale securities, taxes	0	(639)	0	(783)
Included in investment gain (loss), net, related to other-than-temporary impairment charges on available-for-sale securities, taxes	$ 0	$ 0	$ 0	$ 676

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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Series B Preferred Stock	Common Class A	Preferred Stock Series B Preferred Stock	Common Stock Common Class A	Common Stock Common Class B	Additional Paid-in Capital	Additional Paid-in Capital Common Class A	Accumulated Other Comprehensive Income	Accumulated Deficit
Balances at Dec. 31, 2015	$ 459,428				$ 229	$ 1	$ 1,898,085		$ 12,371	$ (1,451,258)
Balances (in shares) at Dec. 31, 2015					22,874,819	102,216
Net Income (loss)	(41,347)									(41,347)
Conversion of Class B common stock to Class A common stock					$ 1	$ (1)
Conversion of Class B common stock to Class A common stock (in shares)					81,960	(81,960)
Issuance of stock			$ 9,675		$ 6			$ 9,669
Issuance of stock (in shares)					595,342
Issuance of Class A common stock under stock-based compensation plans (in shares)					73,457
Repurchase of Class A common stock under stock-based compensation plans	(269)						(269)
Repurchase of Class A common stock under stock-based compensation plans (in shares)					(18,467)
Stock-based compensation	2,974						2,974
Income tax provision from stock-based compensation	(175)						(175)
Other comprehensive loss	(12,371)								$ (12,371)
Dividends declared	(59,102)									(59,102)
Balances at Dec. 31, 2016	358,813				$ 236		1,910,284			(1,551,707)
Balances (in shares) at Dec. 31, 2016					23,607,111	20,256
Balances at Mar. 31, 2017	349,878
Balances at Dec. 31, 2016	358,813				$ 236		1,910,284			(1,551,707)
Balances (in shares) at Dec. 31, 2016					23,607,111	20,256
Net Income (loss)	10,194									10,194
Conversion of Class B common stock to Class A common stock (in shares)					20,256	(20,256)
Issuance of stock		$ 6,904	$ 59,913	$ 6,904	$ 44			$ 59,869
Issuance of stock (in shares)				294,993	4,369,637
Issuance of Class A common stock under stock-based compensation plans (in shares)					74,000
Repurchase of Class A common stock under stock-based compensation plans	(437)						(437)
Repurchase of Class A common stock under stock-based compensation plans (in shares)					(32,729)
Stock-based compensation	2,747						2,747
Dividends declared	(45,562)									(45,562)
Balances at Sep. 30, 2017	$ 392,572			$ 6,904	$ 280		$ 1,972,463			$ (1,587,075)
Balances (in shares) at Sep. 30, 2017				294,993	28,038,275

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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income	$ 10,194	$ 89
Adjustments to reconcile net income to net cash provided by operating activities
Investment loss, net	4,364	38,115
Net premium amortization on mortgage-backed securities	24,767	19,647
Deferred tax provision	25,376	4,692
Other	2,314	1,913
Changes in operating assets
Interest receivable	(782)	1,253
Other assets	412	2,246
Changes in operating liabilities
Interest payable and other liabilities	(506)	(2,786)
Accrued compensation and benefits	(1,196)	(855)
Net cash provided by operating activities	64,943	64,314
Cash flows from investing activities:
Proceeds from sales of private-label mortgage-backed securities	1,268	106,052
Proceeds from sales of agency mortgage-backed securities	1,629,698	1,950,728
Receipt of principal payments on private-label mortgage-backed securities	14	490
Receipt of principal payments on agency mortgage-backed securities	357,643	351,871
Payments for derivatives and deposits, net	(9,809)	(138,402)
Other	129	15,891
Net cash (used in) provided by investing activities	(161,661)	229,848
Cash flows from financing activities:
Proceeds from repurchase agreements, net	45,736	542,118
Repayments of Federal Home Loan Bank advances		(786,900)
Proceeds from issuance of common stock	59,913
Proceeds from issuance of preferred stock	6,904
Excess tax benefits associated with stock-based awards		(243)
Dividends paid	(44,261)	(43,363)
Net cash provided by (used in) financing activities	68,292	(288,388)
Net (decrease) increase in cash and cash equivalents	(28,426)	5,774
Cash and cash equivalents, beginning of period	54,794	36,987
Cash and cash equivalents, end of period	26,368	42,761
Supplemental cash flow information:
Cash payments for interest	37,015	21,605
Cash payments for taxes		205
Non-cash investing activity:
Receipt of non-public equity securities upon dissolution of investee fund		619
Private-Label MBS
Cash flows from investing activities:
Purchases of mortgage-backed securities		(5,357)
Agency MBS
Cash flows from investing activities:
Purchases of mortgage-backed securities	$ (2,140,604)	$ (2,051,425)

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Organization and Nature of Operations

9 Months Ended

Sep. 30, 2017

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Organization and Basis of Presentation

Note 1. Organization and Basis of Presentation

Arlington Asset Investment Corp. (“Arlington Asset”) and its consolidated subsidiaries (unless the context otherwise provides, collectively, the “Company”) is an investment firm that acquires and holds residential mortgage-related assets, primarily comprised of residential mortgage-backed securities (“MBS”). The Company’s investments in residential MBS include (i) residential mortgage pass-through certificates for which the principal and interest payments are guaranteed by a government-sponsored enterprise (“GSE”) such as the Federal National Mortgage Association (“Fannie Mae”) or the Federal Home Loan Mortgage Corporation (“Freddie Mac”), which are collectively referred to as “agency MBS,” and (ii) residential MBS issued by private institutions for which the principal and interest payments are not guaranteed by a GSE, which are referred to as “private-label MBS” or “non-agency MBS.”

The unaudited interim consolidated financial statements are prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and pursuant to the requirements for reporting on Form 10-Q and Article 10 of Regulation S-X. The Company’s unaudited interim consolidated financial statements and notes thereto should be read in conjunction with the Company’s audited annual consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016.  

The Company’s consolidated financial statements include the accounts of Arlington Asset and all other entities in which the Company has a controlling financial interest. All intercompany accounts and transactions have been eliminated in consolidation.

The preparation of financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect amounts reported in the consolidated financial statements. Although the Company bases these estimates and assumptions on historical experience and all other reasonably available information that the Company believes to be relevant under the circumstances, such estimates frequently require management to exercise significant subjective judgment about matters that are inherently uncertain. Actual results may differ from these estimates.

Certain amounts in the consolidated financial statements and notes for prior periods have been reclassified to conform to the current year’s presentation. These reclassifications had no impact on the previously reported net income, other comprehensive income, total assets or total liabilities.

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Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Note 2. Summary of Significant Accounting Policies

Cash Equivalents

Cash equivalents include demand deposits with banks, money market accounts and highly liquid investments with original maturities of three months or less. As of September 30, 2017 and December 31, 2016, approximately 98% and 99%, respectively, of the Company’s cash equivalents were invested in money market funds that invest primarily in U.S. Treasuries and other securities backed by the U.S. government.

Investment Security Purchases and Sales

Purchases and sales of investment securities are recorded on the settlement date of the transfer unless the trade qualifies as a “regular-way” trade and the associated commitment qualifies for an exemption from the accounting guidance applicable to derivative instruments. A regular-way trade is an investment security purchase or sale transaction that is expected to settle within the period of time following the trade date that is prevalent or traditional for that specific type of security. Any amounts payable or receivable for unsettled security trades are recorded as “sold securities receivable” or “purchased securities payable” in the consolidated balance sheets.

Interest Income Recognition for Investments in Agency MBS

The Company recognizes interest income for its investments in agency MBS by applying the “interest method” permitted by GAAP, whereby purchase premiums and discounts are amortized and accreted, respectively, as an adjustment to contractual interest income accrued at each security’s stated coupon rate. The interest method is applied at the individual security level based upon each security’s effective interest rate. The Company calculates each security’s effective interest rate at the time of purchase by solving for the discount rate that equates the present value of that security's remaining contractual cash flows (assuming no principal prepayments) to its purchase price. Because each security’s effective interest rate does not reflect an estimate of future prepayments, the Company refers to this manner of applying the interest method as the “contractual effective interest method.” When applying the contractual effective interest method to its investments in agency MBS, as principal prepayments occur, a proportional amount of the unamortized premium or discount is recognized in interest income such that the effective interest rate on the remaining security balance is unaffected.

Interest Income Recognition for Investments in Private-Label MBS

The Company’s investments in private-label MBS were generally acquired at significant discounts to their par values due in large part to an expectation that the Company will be unable to collect all of the contractual cash flows of the securities. Investments in private-label MBS acquired prior to 2015 were classified as available-for-sale, all of which had been sold as of December 31, 2016. The Company has elected to classify its investments in private-label MBS acquired in 2015 or later as trading securities. Interest income from investments in private-label MBS is recognized using a prospective level-yield methodology which is based upon each security’s effective interest rate. The amount of periodic interest income recognized is determined by applying the security’s effective interest rate to its amortized cost basis or reference amount. At the time of acquisition, the security’s effective interest rate is calculated by solving for the single discount rate that equates the present value of the Company’s best estimate of the amount and timing of the cash flows expected to be collected from the security to its purchase price. To prepare its best estimate of cash flows expected to be collected, the Company develops a number of assumptions about the future performance of the pool of mortgage loans that serve as collateral for its investment, including assumptions about the timing and amount of prepayments and credit losses.

In each subsequent quarterly reporting period, the amount and timing of cash flows expected to be collected from the security are re-estimated based upon current information and events. The following table provides a description of how periodic changes in the estimate of cash flows expected to be collected affect interest income recognition prospectively for investments in private-label MBS that are classified as available-for-sale and trading securities, respectively:

	Effect on Interest Income Recognition for Investments in Private-Label MBS Classified as:
Scenario:	Available-for-Sale	Trading
A positive change in cash flows occurs. Actual cash flows exceed prior estimates and/or a positive change occurs in the estimate of expected remaining cash flows.	If the positive change in cash flows is deemed significant, a revised effective interest rate is calculated and applied prospectively such that the positive change is recognized as incremental interest income over the remaining life of the security. This revised effective interest rate is also used in subsequent periods to determine if any declines in the fair value of that security are other-than-temporary.	A revised effective interest rate is calculated and applied prospectively such that the positive change in cash flows is recognized as incremental interest income over the remaining life of the security.
An adverse change in cash flows occurs. Actual cash flows fall short of prior estimates and/or an adverse change occurs in the estimate of expected remaining cash flows.	The security’s effective interest rate is unaffected. If an adverse change in cash flows occurs for a security that is impaired (that is, its fair value is less than its amortized cost basis), the impairment is considered other-than-temporary due to the occurrence of a credit loss. If a credit loss occurs, the Company writes-down the amortized cost basis of the security to an amount equal to the present value of cash flows expected to be collected, discounted at the security’s existing effective interest rate, and recognizes a corresponding other-than-temporary impairment charge in earnings as a component of “investment gain (loss), net.”	The amount of periodic interest income recognized over the remaining life of the security will be reduced accordingly. Specifically, if an adverse change in cash flows occurs for a security that is impaired (that is, its fair value is less than its reference amount), the reference amount to which the security’s existing effective interest rate will be prospectively applied will be reduced to the present value of cash flows expected to be collected, discounted at the security’s existing effective interest rate. If an adverse change in cash flows occurs for a security that is not impaired, the security’s effective interest rate will be reduced accordingly and applied on a prospective basis.

Other Comprehensive Income

Comprehensive income includes net income as currently reported by the Company on the consolidated statements of comprehensive income adjusted for other comprehensive income. Other comprehensive income for the Company represents periodic unrealized holding gains and losses related to the Company’s investments in MBS classified as available-for-sale. Accumulated unrealized holding gains and losses for available-for-sale MBS are reclassified into net income as a component of “investment gain (loss), net” upon (i) sale or realization, or (ii) the occurrence of an other-than-temporary impairment. As of December 31, 2016 all of the Company’s investments in MBS are classified as trading securities. Accordingly, all unrealized gains and losses related to the Company’s investments in MBS during 2017 have been recognized in net income.

Other Significant Accounting Policies

Certain of the Company’s other significant accounting policies are summarized in the following notes:

Investments in agency MBS, subsequent measurement	Note 3
Investments in private-label MBS, subsequent measurement	Note 4
Borrowings	Note 5
To-be-announced agency MBS transactions, including “dollar rolls”	Note 6
Derivative instruments	Note 6
Balance sheet offsetting	Note 7
Fair value measurements	Note 8

Refer to the Company’s 2016 Annual Report on Form 10-K for a complete inventory and summary of the Company’s significant accounting policies.

Recent Accounting Pronouncements

The following table provides a brief description of recently issued accounting pronouncements and their actual or expected effect on the Company’s consolidated financial statements:

Standard	Description	Date of Adoption	Effect on the Consolidated Financial Statements
Recently Adopted Accounting Guidance
ASU No. 2016-07, Simplifying the Transition to the Equity Method of Accounting (Topic 323)	This amendment eliminates the requirement that when an investment qualifies for use of the equity method as a result of an increase in the level of ownership interest or degree of influence, an investor must adjust the investment, results of operations, and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods that the investment had been held.	January 1, 2017	The adoption of ASU No. 2016-07 did not impact the Company’s consolidated financial statements.
ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting (Topic 718)	This amendment was issued with the objective of simplifying several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. Some of the areas for simplification apply only to nonpublic entities.	January 1, 2017	The adoption of ASU No. 2016-07 did not have a material impact on the Company’s consolidated financial statements.
Recently Issued Accounting Guidance Not Yet Adopted
ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date	This amendment defers the effective date of ASU No. 2014-09 for all entities by one year. ASU No. 2014-09 requires entities to recognize revenue to depict the transfer of promised goods or services to customers in amounts that reflect the consideration to which the entity expects to be entitled in exchange for those goods or services. Revenue recognition with respect to financial instruments is not within the scope of ASU No. 2014-09.	January 1, 2018	The Company does not expect that the adoption of ASU No. 2015-14 will have a material impact on its consolidated financial statements.
ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (Subtopic 825-10)	This amendment makes targeted changes to certain aspects of guidance applicable to financial assets and financial liabilities. The amendment primarily affects accounting for certain equity investments, financial liabilities measured under the fair value option, and certain financial instrument presentation and disclosure requirements. Accounting for investments in debt securities and financial liabilities not measured under the fair value option is largely unaffected by this amendment.	January 1, 2018	ASU No. 2016-01 requires entities to measure investments in equity securities at fair value, unless fair value measurement is impractical, with changes in fair value recognized in current period earnings.  Upon the adoption of ASU No. 2016-01, the Company will recognize the difference between the fair value of its investments in equity securities currently carried at their historical cost (net of impairments) and the securities’ fair value in net income.  As of September 30, 2017, the Company’s investments in equity securities measured at cost have a balance sheet carrying value of $1,257 and an estimated fair value of $5,761.
ASU No. 2016-02, Leases (Topic 842)	This amendment replaces the existing lease accounting model with a revised model.  The primary change effectuated by the revised lease accounting model is the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases.	January 1, 2019	The Company is currently evaluating the impact of this amendment on its consolidated financial statements.
ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 606)	The amendments in this update require financial assets measured at amortized cost as well as available-for-sale debt securities to be measured for impairment on the basis of the net amount expected to be collected.  Credit losses are to be recognized through an allowance for credit losses, which differs from the direct write-down of the amortized cost basis currently required for other-than-temporary impairments of investments in debt securities.  This update also makes substantial changes to the manner in which interest income is to be recognized for financial assets acquired with a more-than-insignificant amount of credit deterioration since origination. This update will not affect the accounting for investments in debt securities that are classified as trading securities.	January 1, 2019	As of September 30, 2017, all of the Company’s investments in debt securities are classified as trading securities. Accordingly, the Company does not expect ASU No. 2016-13 to have a material impact on its consolidated financial statements.
ASU No. 2016-15, Classification of Certain Cash Receipts and Cash Payments (Topic 230)	This amendment was issued to reduce diversity in practice with respect to eight various statement of cash flow reporting issues for which existing GAAP is either unclear or does not provide specific guidance.	January 1, 2018	The Company does not expect that the adoption of ASU No. 2016-15 will have a material impact on the classification of cash inflows or outflows within its consolidated statement of cash flows.
ASU No. 2017-08, Premium Amortization of Purchased Callable Debt Securities (Subtopic 310-20)	This amendment requires purchase premiums for investments in debt securities that are noncontingently callable by the issuer (at a fixed price and preset date) to be amortized to the earliest call date. Previously, purchase premiums for such investments were permitted to be amortized to the instrument’s maturity date.	January 1, 2020	Investments in prepayable financial assets, such as residential MBS, for which the embedded call options are not held by the issuer are not within the scope of ASU No. 2017-08. Accordingly, the Company does not expect the adoption of ASU No. 2017-08 to have a material effect on its consolidated financial statements.

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Investments in Agency MBS

9 Months Ended

Sep. 30, 2017

Agency MBS

Investments in MBS

Note 3. Investments in Agency MBS

The Company’s investments in agency MBS are reported in the accompanying consolidated balance sheets at fair value. As of September 30, 2017 and December 31, 2016, the Company had $3,994,515 and $3,911,375, respectively, of fair value in agency MBS classified as trading securities.  

As of September 30, 2017 all of the Company’s investments in agency MBS represent undivided (or “pass-through”) beneficial interests in specified pools of fixed-rate mortgage loans. As of December 31, 2016, the Company’s portfolio of investments in agency MBS also included investments in inverse interest-only agency MBS with an aggregate fair value of $1,923. The Company’s investments in inverse interest-only agency MBS represented beneficial interests in a portion of the interest cash flows of an underlying pool of pass-through agency MBS collateralized by adjustable-rate mortgage loans.

All periodic changes in the fair value of trading agency MBS that are not attributed to interest income are recognized as a component of “investment gain (loss), net” in the accompanying consolidated statements of comprehensive income. The following table provides additional information about the gains and losses recognized as a component of “investment gain (loss), net” in the Company’s consolidated statements of comprehensive income for the periods indicated with respect to investments in agency MBS classified as trading securities:

	Three Months Ended September 30,					Nine Months Ended September 30,
	2017		2016			2017		2016
Net gains (losses) recognized in earnings for:
Agency MBS still held at period end	$	12,715	$	2,960		$	22,178	$	56,079
Agency MBS sold during the period		1,296		(428	)		3,421		25,195
Total	$	14,011	$	2,532		$	25,599	$	81,274

The Company also invests in and finances fixed-rate agency MBS on a generic pool basis through sequential series of to-be-announced security transactions commonly referred to as “dollar rolls.” Dollar rolls are accounted for as a sequential series of derivative instruments. Refer to “Note 6. Derivative Instruments” for further information about dollar rolls.

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Investments in Private-Label MBS

9 Months Ended

Sep. 30, 2017

Private-Label MBS

Investments in MBS

Note 4. Investments in Private-Label MBS

The Company’s investments in private-label MBS are reported in the accompanying consolidated balance sheets at fair value. Investments in private-label MBS acquired prior to 2015 were classified as available-for-sale, all of which had been sold as of December 31, 2016. The Company has elected to classify its investments in private-label MBS acquired in 2015 or later as trading securities. As of September 30, 2017 and December 31, 2016, the Company held investments in private-label MBS with a fair value of $54 and $1,266, respectively, all of which were classified as trading securities.

Available-for-Sale Private-Label MBS

Periodic changes in the fair value of the Company’s available-for-sale private-label MBS that are not attributed to interest income or other-than-temporary impairments represent unrealized holding gains and losses. Unrealized holding gains and losses are accumulated in other comprehensive income until the securities are sold. As of September 30, 2017 and December 31, 2016, the Company had no available-for-sale private-label MBS.

Upon the sale of available-for-sale private-label MBS, any gains or losses accumulated in other comprehensive income are recognized in earnings as a component of “investment gain (loss), net.” The Company uses the specific identification method to determine the realized gain or loss that is recognized in earnings upon the sale of an available-for-sale private-label MBS.

The following table presents the results of sales of available-for-sale private-label MBS for the periods indicated:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Proceeds from sales	$	—	$	67,761	$	—	$	96,171
Gross realized gains		—		2,440		—		2,466
Gross realized losses		—		1		—		620

Accretable Yield

The excess of the Company’s estimate of undiscounted future cash flows expected to be collected over the security’s amortized cost basis represents that security’s accretable yield. The accretable yield is expected to be recognized as interest income over the remaining life of the security on a level-yield basis. The difference between undiscounted future contractual cash flows and undiscounted future expected cash flows represents the non-accretable difference. Based on actual payments received and/or changes in the estimate of future cash flows expected to be collected, the accretable yield and the non-accretable difference can change over time. Actual cash collections that exceed prior estimates and/or positive changes in the Company’s periodic estimate of expected future cash flows result in a reclassification of non-accretable difference to accretable yield. Conversely, actual cash collections that fall short of prior estimates and/or adverse changes in the Company’s periodic estimate of expected future cash flows result in a reclassification of accretable yield to non-accretable difference.

The following table presents the changes in the accretable yield solely for available-for-sale private-label MBS for the periods indicated:

	Three Months Ended September 30,					Nine Months Ended September 30,
	2017		2016			2017		2016
Beginning balance	$	—	$	48,199		$	—	$	85,052
Accretion		—		(1,449	)		—		(6,470	)
Reclassifications, net		—		24			—		(11,853	)
Eliminations in consolidation		—		—			—		(3,515	)
Sales		—		(37,346	)		—		(53,786	)
Ending balance	$	—	$	9,428		$	—	$	9,428

Other-than-Temporary Impairments

The Company evaluates available-for-sale MBS for other-than-temporary impairment on a quarterly basis. When the fair value of an available-for-sale security is less than its amortized cost at the quarterly reporting date, the security is considered impaired. Impairments determined to be other-than-temporary are recognized as a direct write-down to the security’s amortized cost basis with a corresponding charge recognized in earnings as a component of “investment gain (loss), net.” An impairment is considered other-than-temporary when (i) the Company intends to sell the impaired security, (ii) the Company more-likely-than not will be required to sell the impaired security prior to the recovery of its amortized cost basis, or (iii) a credit loss exists. A credit loss exists when the present value of the Company’s estimate of the cash flows expected to be collected from the security, discounted at the security’s existing effective interest rate, is less than the security’s amortized cost basis.

If the Company intends to sell an impaired security or it more-likely-than-not will be required to sell an impaired security before recovery of its amortized cost basis, the Company writes-down the amortized cost basis of the security to an amount equal to the security’s fair value and recognizes a corresponding other-than-temporary impairment charge in earnings as a component of “investment gain (loss), net.” If a credit loss exists for an impaired security that the Company does not intend to sell nor will it likely be required to sell prior to recovery, the Company writes-down the amortized cost basis of the security to an amount equal to the present value of cash flows expected to be collected, discounted at the security’s existing effective interest rate, and recognizes a corresponding other-than-temporary impairment charge in earnings as a component of “investment gain (loss), net.”

For the three and nine months ended September 30, 2016, the Company recorded credit related other-than-temporary impairment charges of $-0- and $1,737 as a component of “investment gain (loss), net” on the consolidated statements of comprehensive income on certain available-for-sale private-label MBS. The Company recorded no other-than-temporary impairment charges on available-for-sale private-label MBS during the three and nine months ended September 30, 2017. The following table presents a summary of cumulative credit related other-than-temporary impairment charges recognized on the available-for-sale private-label MBS held as of the dates indicated:

	Three Months Ended September 30,					Nine Months Ended September 30,
	2017		2016			2017		2016
Cumulative credit related other-than-temporary    impairments, beginning balance	$	—	$	15,754		$	—	$	14,017
Additions for:
Securities for which other-than-temporary    impairments have not previously occurred		—		—			—		1,737
Securities with previously recognized other-than-    temporary impairments		—		—			—		—
Reductions for sold or matured securities		—		(2,035	)		—		(2,035	)
Cumulative credit related other-than-temporary    impairments, ending balance	$	—	$	13,719		$	—	$	13,719

Trading Private-Label MBS

Periodic changes in the fair value of investments in trading private-label MBS that are not attributable to interest income are recognized as a component of “investment gain (loss), net” in the Company’s consolidated statements of comprehensive income. The following table provides additional information about the net gains and losses recognized as a component of “investment gain (loss), net” for the periods indicated with respect to investments in private-label MBS classified as trading securities:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Net gains (losses) recognized in earnings for:
Private-label MBS still held at period end	$	(15	)	$	(64	)	$	(24	)	$	(280	)
Private-label MBS sold during the period		—			—			57			89
Total	$	(15	)	$	(64	)	$	33		$	(191	)

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Borrowings

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Borrowings

Note 5. Borrowings

Repurchase Agreements

The Company finances the purchase of MBS through repurchase agreements, which are accounted for as collateralized borrowing arrangements. In a repurchase transaction, the Company sells MBS to a counterparty under a master repurchase agreement in exchange for cash and concurrently agrees to repurchase the same security at a future date in an amount equal to the cash initially exchanged plus an agreed-upon amount of interest. MBS sold under agreements to repurchase remain on the Company’s consolidated balance sheets because the Company maintains effective control over such securities throughout the duration of the arrangement. Throughout the contractual term of a repurchase agreement, the Company recognizes a “repurchase agreement” liability on its consolidated balance sheets to reflect the obligation to repay to the counterparty the proceeds received upon the initial transfer of the MBS. The difference between the proceeds received by the Company upon the initial transfer of the MBS and the contractually agreed-upon repurchase price is recognized as interest expense over the term of the repurchase arrangement on a level-yield basis.

Amounts borrowed pursuant to repurchase agreements are equal in value to a specified percentage of the fair value of the pledged collateral. The Company retains beneficial ownership of the pledged collateral throughout the term of the repurchase agreement. The counterparty to the repurchase agreements may require that the Company pledge additional securities or cash as additional collateral to secure borrowings when the value of the collateral declines.

As of September 30, 2017 and December 31, 2016, the Company had no amount at risk with a single repurchase agreement counterparty or lender greater than 10% of equity. The following table provides information regarding the Company’s outstanding repurchase agreement borrowings as of the dates indicated:

	September 30, 2017			December 31, 2016
Pledged with agency MBS:
Repurchase agreements outstanding	$	3,694,838		$	3,649,102
Agency MBS collateral, at fair value		3,873,154			3,851,269
Net amount (1)		178,316			202,167
Weighted-average rate		1.33	%		0.96	%
Weighted-average term to maturity	11.9 days			19.3 days

⁽¹⁾ Net amount represents the value of collateral in excess of corresponding repurchase obligation. The amount of collateral at-risk is limited to the outstanding repurchase obligation and not the entire collateral balance.

The following table provides information regarding the Company’s outstanding repurchase agreement borrowings during the three and nine months ended September 30, 2017 and 2016:

	September 30, 2017			September 30, 2016
Weighted-average outstanding balance during the three months ended	$	3,819,095		$	3,519,719
Weighted-average rate during the three months ended		1.31	%		0.69	%
Weighted-average outstanding balance during the nine months ended	$	3,956,579		$	3,345,259
Weighted-average rate during the nine months ended		1.10	%		0.67	%

Long-Term Unsecured Debt

As of September 30, 2017 and December 31, 2016, the Company had $73,824 and $73,656, respectively, of outstanding long-term unsecured debentures, net of unamortized debt issuance costs of $1,476 and $1,644, respectively. The Company’s long-term debentures consisted of the following as of the dates indicated:

	September 30, 2017									December 31, 2016
	Senior Notes Due 2025			Senior Notes Due 2023			Trust Preferred Debt			Senior Notes Due 2025			Senior Notes Due 2023			Trust Preferred Debt
Outstanding Principal	$	35,300		$	25,000		$	15,000		$	35,300		$	25,000		$	15,000
Annual Interest Rate		6.75	%		6.625	%	LIBOR+ 2.25 - 3.00 %				6.75	%		6.625	%	LIBOR+ 2.25 - 3.00 %
Interest Payment Frequency	Quarterly			Quarterly			Quarterly			Quarterly			Quarterly			Quarterly
Weighted-Average Interest Rate		6.75	%		6.625	%		4.05	%		6.75	%		6.625	%		3.63	%
Maturity	March 15, 2025			May 1, 2023			2033 - 2035			March 15, 2025			May 1, 2023			2033 - 2035
Early Redemption Date	March 15, 2018			May 1, 2016			2008 - 2010			March 15, 2018			May 1, 2016			2008 - 2010

The Senior Notes due 2023 and the Senior Notes due 2025 are publicly traded on the New York Stock Exchange under the ticker symbols “AIW” and “AIC,” respectively. The Senior Notes due 2023 and Senior Notes due 2025 may be redeemed in whole or in part at any time and from time to time at the Company’s option on or after May 1, 2016 and March 15, 2018, respectively, at a redemption price equal to the principal amount plus accrued and unpaid interest. The indenture governing these Senior Notes contains certain covenants, including limitations on the Company’s ability to merge or consolidate with other entities or sell or otherwise dispose of all or substantially all of the Company’s assets.

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Derivative Instruments

9 Months Ended

Sep. 30, 2017

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivative Instruments

Note 6. Derivative Instruments

In the normal course of its operations, the Company is a party to financial instruments that are accounted for as derivative instruments. Derivative instruments are recorded at fair value as either “derivative assets” or “derivative liabilities” in the consolidated balance sheets, with all periodic changes in fair value reflected as a component of “investment gain (loss), net” in the consolidated statements of comprehensive income. Cash receipts or payments related to derivative instruments are classified as investing activities within the consolidated statements of cash flows.

Types and Uses of Derivative Instruments

Interest Rate Derivatives

Most of the Company’s derivative instruments are interest rate derivatives that are intended to economically hedge changes, attributable to changes in benchmark interest rates, in certain MBS fair values and future interest cash flows on the Company’s short-term financing arrangements. Interest rate derivatives include centrally cleared interest rate swaps, exchange-traded instruments, such as Eurodollar futures, interest rate swap futures, U.S. Treasury note futures and options on futures, and nonexchange-traded instruments such as options on agency MBS. While the Company uses its interest rate derivatives to economically hedge a portion of its interest rate risk, it has not designated such contracts as hedging instruments for financial reporting purposes.

The Company exchanges cash “variation margin” with the counterparties to its interest rate derivative instruments at least on a daily basis based upon daily changes in fair value as measured by the Chicago Mercantile Exchange (“CME”), the central clearinghouse through which those derivatives are cleared. In addition, the CME requires market participants to deposit and maintain an “initial margin” amount which is determined by the CME and is generally intended to be set at a level sufficient to protect the CME from the maximum estimated single-day price movement in that market participant’s contracts.

Receivables recognized for the right to reclaim cash initial margin posted in respect of interest rate derivative instruments are included in the line item “deposits, net” in the accompanying consolidated balance sheets. Prior to January 1, 2017, the daily exchange of variation margin associated with centrally cleared derivative instruments was considered a pledge of collateral. For these prior periods, receivables recognized for the right to reclaim cash variation margin posted in respect of interest rate derivative instruments are included in the line item “deposits, net” in the accompanying consolidated balance sheets. The Company elected to offset any payables recognized for the obligation to return cash variation margin received from an interest rate derivative instrument counterparty against receivables recognized for the right to reclaim cash initial margin posted by the Company to that same counterparty.

Beginning on January 1, 2017, as a result of a CME amendment to their rule book which governs their central clearing activities, the daily exchange of variation margin associated with a centrally cleared derivative instrument is legally characterized as the daily settlement of the derivative instrument itself, as opposed to a pledge of collateral. Accordingly, beginning in 2017, the Company accounts for the daily receipt or payment of variation margin associated with its centrally cleared interest rate swaps as a direct reduction to the carrying value of the interest rate swap derivative asset or liability, respectively. Beginning in 2017, the carrying amount of centrally cleared interest rate swaps reflected in the Company’s consolidated balance sheets is equal to the unsettled fair value of such instruments; because variation margin is exchanged on a one-day lag, the unsettled fair value of such instruments represents the change in fair value that occurred on the last day of the reporting period.

To-Be-Announced Agency MBS Transactions, Including “Dollar Rolls”

In addition to interest rate derivatives that are used for interest rate risk management, the Company is a party to derivative instruments that economically serve as investments, such as forward contracts to purchase fixed-rate “pass-through” agency MBS on a non-specified pool basis, which are known as to-be-announced (“TBA”) contracts. A TBA contract is a forward contract for the purchase or sale of a fixed-rate agency MBS at a predetermined price, face amount, issuer, coupon, and stated maturity for settlement on an agreed upon future date. The specific agency MBS that will be delivered to satisfy the TBA trade is not known at the inception of the trade. The Company accounts for TBA contracts as derivative instruments because the Company cannot assert that it is probable at inception and throughout the term of an individual TBA contract that its settlement will result in physical delivery of the underlying agency MBS, or the individual TBA contract will not settle in the shortest time period possible.

The Company’s agency MBS investment portfolio includes net purchase (or “net long”) positions in TBA securities, which are primarily the result of executing sequential series of “dollar roll” transactions. The Company executes dollar roll transactions as a means of investing in and financing non-specified fixed-rate agency MBS. Such transactions involve effectively delaying (or “rolling”) the settlement of a forward purchase of a TBA agency MBS by entering into an offsetting sale prior to the settlement date, net settling the “paired-off” positions in cash, and contemporaneously entering another forward purchase of a TBA agency MBS of the same characteristics for a later settlement date. TBA securities purchased for a forward settlement month are generally priced at a discount relative to TBA securities sold for settlement in the current month. This discount, often referred to as the dollar roll “price drop,” reflects compensation for the net interest income (interest income less financing costs) that is foregone as a result of relinquishing beneficial ownership of the MBS for the duration of the dollar roll (also known as “dollar roll income”). By executing a sequential series of dollar roll transactions, the Company is able to create the economic experience of investing in an agency MBS, financed with a repurchase agreement, over a period of time. Forward purchases and sales of TBA securities are accounted for as derivative instruments in the Company’s financial statements. Accordingly, dollar roll income is recognized as a component of “investment gain (loss), net” along with all other periodic changes in the fair value of TBA commitments.

In addition to transacting in net long positions in TBA securities for investment purposes, the Company may also, from time to time, transact in net sale (or “net short”) positions in TBA securities for the purpose of economically hedging a portion of the sensitivity of the fair value of the Company’s investments in agency MBS to changes in interest rates.

Receivables recognized for the right to reclaim cash collateral posted by the Company in respect of TBA transactions is included in the line item “deposits, net” in the accompanying consolidated balance sheets. Liabilities recognized for the obligation to return cash collateral received by the Company in respect of TBA transactions is included in the line item “other liabilities” in the accompanying consolidated balance sheets.

In addition to TBA transactions, the Company may, from time to time, enter into commitments to purchase or sell specified agency MBS that do not qualify as regular-way security trades. Such commitments are also accounted for as derivative instruments.

Derivative Instrument Population and Fair Value

The following table presents the fair value of the Company’s derivative instruments as of the dates indicated:

	September 30, 2017					December 31, 2016
	Assets		Liabilities			Assets		Liabilities
Interest rate swaps	$	3,348	$	—		$	63,315	$	(1,949	)
10-year U.S. Treasury note futures		820		—			—		—
Options on 10-year U.S. Treasury note futures		1		—			4,289		(3,906	)
Options on agency MBS		8		—			—		—
TBA commitments		—		(7,146	)		7,285		(3,699	)
Total	$	4,177	$	(7,146	)	$	74,889	$	(9,554	)

Interest Rate Swaps

The Company’s interest rate swap agreements represent agreements to make semiannual interest payments based upon a fixed interest rate and receive quarterly variable interest payments based upon the prevailing three-month LIBOR on the date of reset.

The following table presents information about the Company’s interest rate swap agreements that were in effect as of September 30, 2017:

			Weighted-average:
	Notional Amount		Fixed Pay Rate			Variable Receive Rate			Net Receive (Pay) Rate			Remaining Life (Years)		Fair Value
Years to maturity:
Less than 3 years	$	1,300,000		1.26	%		1.32	%		0.06	%		1.7	$	447
3 to less than 7 years		700,000		1.87	%		1.32	%		(0.55	)%		4.1		844
7 to 10 years		1,600,000		1.90	%		1.32	%		(0.58	)%		8.5		1,963
Total / weighted-average	$	3,600,000		1.66	%		1.32	%		(0.34	)%		5.2	$	3,254

The following table presents information about the Company’s forward-starting interest rate swap agreements that had yet to take effect as of September 30, 2017:

			Weighted-average:
	Notional Amount		Fixed Pay Rate			Term After Effective Date (Years)		Fair Value
Effective in October 2017	$	250,000		1.12	%		2.0	$	94

The following table presents information about the Company’s interest rate swap agreements that were in effect as of December 31, 2016:

			Weighted-average:
	Notional Amount		Fixed Pay Rate			Variable Receive Rate			Net (Pay) Rate			Remaining Life (Years)		Fair Value
Years to maturity:
Less than 3 years	$	1,375,000		1.10	%		0.97	%		(0.13	)%		1.7	$	6,470
3 to less than 7 years		350,000		1.84	%		1.00	%		(0.84	)%		3.7		(769	)
7 to 10 years		1,600,000		1.93	%		0.96	%		(0.97	)%		9.2		50,511
Total / weighted-average	$	3,325,000		1.58	%		0.97	%		(0.61	)%		5.5	$	56,212

The following table presents information about the Company’s forward-starting interest rate swap agreements that had yet to take effect as of December 31, 2016:

			Weighted-average:
	Notional Amount		Fixed Pay Rate			Term After Effective Date (Years)		Fair Value
Effective in September / October 2017	$	375,000		1.13	%		2.0	$	5,154

10-year U.S. Treasury Note Futures

The Company’s 10-year U.S. Treasury note futures held as of September 30, 2017, are short positions with an aggregate notional amount of $350,000 that mature in December 2017. Upon the maturity date of these futures contracts, the Company has the option to either net settle each contract in cash in an amount equal to the difference between the then-current fair value of the underlying 10-year U.S. Treasury note and the contractual sale price inherent to the futures contract, or to physically settle the contract by delivering the underlying 10-year U.S. Treasury note.

Options on 10-year U.S. Treasury Note Futures

The Company purchases and sells exchange-traded options on 10-year U.S. Treasury note futures contracts with the objective of economically hedging a portion of the sensitivity of its investments in agency MBS to significant changes in interest rates. The Company may purchase put options which provide the Company with the right to sell 10-year U.S. Treasury note futures to a counterparty, and the Company may also write call options that provide a counterparty with the option to buy 10-year U.S. Treasury note futures from the Company. In order to limit its exposure on its interest rate derivative instruments from a significant decline in long-term interest rates, the Company may also purchase contracts that provide the Company with the option to buy, or call, 10-year U.S. Treasury note futures from a counterparty. The options may be exercised at any time prior to their expiry, and if exercised, may be net settled in cash or through physical receipt or delivery of the underlying futures contracts. Information about the Company’s outstanding options on 10-year U.S. Treasury note futures contracts as of September 30, 2017 is as follows:

	Notional Amount		Weighted-average Strike Price		Implied Strike Rate (1)			Net Fair Value
Purchased call options:
October 2017 expiration	$	150,000		133.0		1.49	%	$	1

(1) The implied strike rate is estimated based upon the weighted average strike price per contract and the price of an equivalent 10-year U.S. Treasury note futures contract.

Information about the Company’s outstanding options on 10-year U.S. Treasury note futures contracts as of December 31, 2016 is as follows:

	Notional Amount			Weighted-average Strike Price		Implied Strike Rate (1)			Net Fair Value
Purchased put options:
January 2017 expiration	$	950,000			120.8		2.87	%	$	539
February 2017 expiration		700,000			122.6		2.64	%		3,281
Total / weighted average for purchased put options	$	1,650,000			121.6		2.77	%	$	3,820
Sold call options:
January 2017 expiration	$	(100,000	)		126.0		2.25	%	$	(141	)
February 2017 expiration		(900,000	)		126.0		2.24	%		(3,765	)
Total / weighted average for sold call options	$	(1,000,000	)		126.0		2.24	%	$	(3,906	)
Purchased call options:
January 2017 expiration	$	1,000,000			127.1		2.12	%	$	469
									$	383

(1) The implied strike rate is estimated based upon the weighted average strike price per contract and the price of an equivalent 10-year U.S. Treasury note futures contract.

Options on Agency MBS

The Company may purchase put options which provide the Company with the right to sell TBA-eligible agency MBS to a counterparty at a fixed price in the event that agency MBS prices decline. The options can only be exercised at their expiry, and if exercised, may be net settled in cash or through physical delivery of the underlying agency MBS. Information about the Company’s outstanding options on agency MBS as of September 30, 2017 is as follows:

	Notional Amount		Weighted-average Strike Price		Underlying Agency MBS Coupon			Net Fair Value
Purchased put options:
October 2017 expiration	$	500,000		102.5		4.00	%	$	-
November 2017 expiration		200,000		103.5		4.00	%		8
Total / weighted average for purchased put options	$	700,000		102.8		4.00	%	$	8

TBA Commitments

The following tables present information about the Company’s TBA commitments as of the dates indicated:

	September 30, 2017
	Notional Amount: Net Purchase (Sale) Commitment			Contractual Forward Price			Market Price			Fair Value
Dollar roll positions:
3.0% coupon purchase commitments	$	200,000		$	202,258		$	200,563		$	(1,695	)
3.5% coupon purchase commitments		1,005,000			1,040,762			1,036,092			(4,670	)
4.0% coupon purchase commitments		250,000			263,929			263,164			(765	)
4.0% coupon sale commitments		(100,000	)		(105,250	)		(105,266	)		(16	)
Total TBA commitments, net	$	1,355,000		$	1,401,699		$	1,394,553		$	(7,146	)

	December 31, 2016
	Notional Amount: Net Purchase (Sale) Commitment			Contractual Forward Price			Market Price			Fair Value
Dollar roll positions:
3.0% coupon purchase commitments	$	725,000		$	718,887		$	720,027		$	1,140
3.5% coupon purchase commitments		25,000			25,586			25,613			27
3.5% coupon sale commitments		(25,000	)		(25,602	)		(25,613	)		(11	)
Total dollar roll positions, net		725,000			718,871			720,027			1,156
TBA commitments serving as economic hedges:
3.5% coupon purchase commitments		600,000			608,601			614,719			6,118
3.5% coupon sale commitments		(600,000	)		(611,031	)		(614,719	)		(3,688	)
Total economic hedges, net		—			(2,430	)		—			2,430
Total TBA commitments, net	$	725,000		$	716,441		$	720,027		$	3,586

Derivative Instrument Gains and Losses

The following tables provide information about the derivative gains and losses recognized within the periods indicated:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Interest rate derivatives:
Interest rate swaps:
Net interest expense (1)	$	(4,198	)	$	(5,126	)	$	(14,900	)	$	(13,499	)
Unrealized gains (losses), net		10,833			15,426			(7,991	)		(65,519	)
Losses realized upon early termination		(14,137	)		(300	)		(13,441	)		(300	)
Total interest rate swap (losses) gains, net		(7,502	)		10,000			(36,332	)		(79,318	)
U.S. Treasury note futures, net		(133	)		—			(2,174	)		(63,285	)
Options on U.S. Treasury note futures, net		(147	)		(1,631	)		(6,300	)		(7,880	)
Other, net		(221	)		—			(221	)		(25	)
Total interest rate derivative (losses) gains, net		(8,003	)		8,369			(45,027	)		(150,508	)
TBA and specified agency MBS commitments:
TBA dollar roll income (2)		6,424			5,321			14,120			12,835
Other gains on agency MBS commitments, net		1,007			1,506			962			17,728
Total gains on agency MBS commitments, net		7,431			6,827			15,082			30,563
Total derivative (losses) gains, net	$	(572	)	$	15,196		$	(29,945	)	$	(119,945	)

(1) Represents the periodic net interest settlement incurred during the period (often referred to as “net interest carry”). Beginning in 2017, also includes “price alignment interest” income earned or expense incurred on cumulative variation margin paid or received, respectively, associated with centrally cleared interest rate swap agreements.

(2) Represents the price discount of forward-settling TBA purchases relative to a contemporaneously executed “spot” TBA sale, which economically equates to net interest income that is earned ratably over the period beginning on the settlement date of the sale and ending on the settlement date of the forward-settling purchase.

Derivative Instrument Activity

The following tables summarize the volume of activity, in terms of notional amount, related to derivative instruments for the periods indicated:

	For the Three Months Ended September 30, 2017
	Beginning of Period		Additions		Scheduled Settlements			Early Terminations			End of Period
Interest rate swaps	$	3,850,000	$	500,000	$	—		$	(500,000	)	$	3,850,000
10-year U.S. Treasury note futures		350,000		351,000		(351,000	)		—			350,000
Purchased call options on 10-year U.S. Treasury note   futures		700,000		950,000		(1,500,000	)		—			150,000
Purchased put options on agency MBS		—		700,000		—			—			700,000
Commitments to purchase (sell) MBS, net		1,110,000		4,160,000		(3,915,000	)		—			1,355,000

	For the Three Months Ended September 30, 2016
	Beginning of Period		Additions		Scheduled Settlements			Early Terminations			End of Period
Interest rate swaps	$	2,250,000	$	1,250,000	$	—		$	(375,000	)	$	3,125,000
10-year U.S. Treasury note futures		—		15,000		(15,000	)		—			—
Purchased put options on 10-year U.S. Treasury note   futures		2,000,000		2,100,000		(3,500,000	)		—			600,000
Sold call options on 10-year U.S. Treasury note futures		—		1,000,000		(400,000	)		—			600,000
Purchased call options on 10-year U.S. Treasury note   futures		—		500,000		(200,000	)		—			300,000
Commitments to purchase (sell) MBS, net		875,441		2,675,000		(2,425,441	)		—			1,125,000

	For the Nine Months Ended September 30, 2017
	Beginning of Period		Additions		Scheduled Settlements			Early Terminations			End of Period
Interest rate swaps	$	3,700,000	$	1,275,000	$	—		$	(1,125,000	)	$	3,850,000
10-year U.S. Treasury note futures		—		1,196,100		(846,100	)		—			350,000
Purchased put options on 10-year U.S. Treasury note   futures		1,650,000		2,540,000		(4,190,000	)		—			—
Sold call options on 10-year U.S. Treasury note futures		1,000,000		2,450,000		(3,450,000	)		—			—
Purchased call options on 10-year U.S. Treasury note   futures		1,000,000		3,350,000		(4,200,000	)		—			150,000
Purchased put options on agency MBS		—		700,000		—			—			700,000
Commitments to purchase (sell) MBS, net		725,000		8,475,000		(7,845,000	)		—			1,355,000

	For the Nine Months Ended September 30, 2016
	Beginning of Period		Additions		Scheduled Settlements			Early Terminations			End of Period
Interest rate swaps	$	1,500,000	$	2,000,000	$	—		$	(375,000	)	$	3,125,000
10-year U.S. Treasury note futures		1,335,000		1,386,000		(2,133,500	)		(587,500	)		—
Purchased put options on 10-year U.S. Treasury note   futures		—		8,100,000		(7,500,000	)		—			600,000
Sold call options on 10-year U.S. Treasury note futures		—		1,000,000		(400,000	)		—			600,000
Purchased call options on 10-year U.S. Treasury note   futures		—		500,000		(200,000	)		—			300,000
Put options on Eurodollar futures		4,000,000		—		(4,000,000	)		—			—
Commitments to purchase (sell) MBS, net		375,000		6,225,441		(5,475,441	)		—			1,125,000

Cash Collateral Posted and Received for Derivative and Other Financial Instruments

The following table presents information about the cash collateral posted and received by the Company in respect of its derivative and other financial instruments, which is included in the line item “deposits, net” in the accompanying consolidated balance sheets, for the dates indicated:

	September 30, 2017		December 31, 2016
Cash collateral posted for:
Interest rate swaps (cash initial margin)	$	49,518	$	65,728
U.S. Treasury note futures and options on U.S. Treasury note   futures (cash initial margin)		4,035		5,314
Unsettled MBS trades and TBA commitments, net		5,764		1,474
Total cash collateral posted		59,317		72,516
Cash collateral received for interest rate swaps (1)		—		(61,367	)
Total cash collateral posted, net	$	59,317	$	11,149

(1) Beginning in 2017, the Company accounts for the daily receipt or payment of cash variation margin associated with centrally cleared interest rate swaps as a legal settlement of the derivative instrument itself, as opposed to a pledge of collateral.

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Offsetting of Financial Assets and Liabilities

9 Months Ended

Sep. 30, 2017

Offsetting [Abstract]

Offsetting of Financial Assets and Liabilities

Note 7. Offsetting of Financial Assets and Liabilities

The agreements that govern certain of the Company’s derivative instruments and collateralized short-term financing arrangements provide for a right of setoff in the event of default or bankruptcy with respect to either party to such transactions. The Company presents derivative assets and liabilities as well as collateralized short-term financing arrangements on a gross basis.

Receivables recognized for the right to reclaim cash initial margin posted in respect of interest rate derivative instruments are included in the line item “deposits, net” in the accompanying consolidated balance sheets. Prior to January 1, 2017, the daily exchange of variation margin associated with centrally cleared derivative instruments was considered a pledge of collateral. For these prior periods, receivables recognized for the right to reclaim cash variation margin posted in respect of interest rate derivative instruments are included in the line item “deposits, net” in the accompanying consolidated balance sheets. The Company elected to offset any payables recognized for the obligation to return cash variation margin received from an interest rate derivative instrument counterparty against receivables recognized for the right to reclaim cash initial margin posted by the Company to that same counterparty.

Beginning on January 1, 2017, as a result of a CME amendment to their rule book which governs their central clearing activities, the daily exchange of variation margin associated with a centrally cleared derivative instrument is legally characterized as the daily settlement of the derivative instrument itself, as opposed to a pledge of collateral. Accordingly, beginning in 2017, the Company accounts for the daily receipt or payment of variation margin associated with its centrally cleared interest rate swaps as a direct reduction to the carrying value of the interest rate swap derivative asset or liability, respectively. Beginning in 2017, the carrying amount of centrally cleared interest rate swaps reflected in the Company’s consolidated balance sheets is equal to the unsettled fair value of such instruments; because variation margin is exchanged on a one-day lag, the unsettled fair value of such instruments represents the change in fair value that occurred on the last day of the reporting period.

The following tables present information, as of the dates indicated, about the Company’s derivative instruments, short-term borrowing arrangements, and associated collateral, including those subject to master netting (or similar) arrangements:

	As of September 30, 2017
	Gross Amount Recognized		Amount Offset in the Consolidated Balance Sheets		Net Amount Presented in the Consolidated Balance Sheets		Gross Amount Not Offset in the Consolidated Balance Sheets						Net Amount
							Financial Instruments (1)			Cash Collateral (2)
Assets:
Derivative instruments:
Options on U.S. Treasury note futures	$	1	$	—	$	1	$	—		$	—		$	1
U.S. Treasury note futures		820		—		820		—			(820	)		—
Interest rate swaps		3,348		—		3,348		—			(3,348	)		—
Options on agency MBS		8		—		8		—			—			8
Total derivative instruments		4,177		—		4,177		—			(4,168	)		9
Total assets	$	4,177	$	—	$	4,177	$	—		$	(4,168	)	$	9
Liabilities:
Unsettled MBS trades and TBA   commitments, net (3)	$	7,146	$	—	$	7,146	$	—		$	(5,764	)	$	1,382
Repurchase agreements		3,694,838		—		3,694,838		(3,694,838	)		—			—
Total liabilities	$	3,701,984	$	—	$	3,701,984	$	(3,694,838	)	$	(5,764	)	$	1,382

	As of December 31, 2016
	Gross Amount Recognized		Amount Offset in the Consolidated Balance Sheets			Net Amount Presented in the Consolidated Balance Sheets		Gross Amount Not Offset in the Consolidated Balance Sheets						Net Amount
								Financial Instruments (1)			Cash Collateral (2)
Assets:
Derivative instruments:
Options on U.S. Treasury note futures	$	4,289	$	—		$	4,289	$	(3,906	)	$	—		$	383
Interest rate swaps		63,315		—			63,315		(1,949	)		(61,366	)		—
TBA commitments		7,285		—			7,285		—			—			7,285
Total derivative instruments		74,889		—			74,889		(5,855	)		(61,366	)		7,668
Deposits, net		72,516		(61,367	)		11,149		—			—			11,149
Total assets	$	147,405	$	(61,367	)	$	86,038	$	(5,855	)	$	(61,366	)	$	18,817
Liabilities:
Derivative instruments:
Options on U.S. Treasury note futures	$	3,906	$	—		$	3,906	$	(3,906	)	$	—		$	—
Interest rate swaps		1,949		—			1,949		(1,949	)		—			—
TBA commitments		3,699		—			3,699		—			(1,474	)		2,225
Total derivative instruments		9,554		—			9,554		(5,855	)		(1,474	)		2,225
Deposits, net		61,367		(61,367	)		—		—			—			—
Repurchase agreements		3,649,102		—			3,649,102		(3,649,102	)		—			—
Total liabilities	$	3,720,023	$	(61,367	)	$	3,658,656	$	(3,654,957	)	$	(1,474	)	$	2,225

⁽¹⁾ Does not include the fair value amount of financial instrument collateral pledged in respect of repurchase agreements that exceeds the associated liability presented in the consolidated balance sheets.

⁽²⁾ Does not include the amount of cash collateral pledged in respect of derivative instruments that exceeds the associated derivative liability presented in the consolidated balance sheets.

⁽³⁾ The “Gross Amount Recognized” and “Net Amount Presented in the Consolidated Balances Sheets” excludes the fair value of unsettled agency MBS purchases and sales recognized on their respective trade dates.

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Fair Value Measurements

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements

Note 8. Fair Value Measurements

Fair Value of Financial Instruments

The accounting principles related to fair value measurements define fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Financial Accounting Standards Board Accounting Standards Codification Topic 820, Fair Value Measurements and Disclosures, establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels, giving the highest priority to quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3) as described below:

Level 1 Inputs -  Unadjusted quoted prices in active markets for identical assets or liabilities that are accessible by the Company at the measurement date;

Level 2 Inputs -  Quoted prices in markets that are not active or financial instruments for which all significant inputs are observable, either directly or indirectly; and

Level 3 Inputs -  Unobservable inputs for the asset or liability, including significant judgments made by the Company about the assumptions that a market participant would use.

The Company measures the fair value of the following assets and liabilities:

Mortgage-backed securities

Agency MBS - The Company’s investments in agency MBS are classified within Level 2 of the fair value hierarchy. Inputs to fair value measurements of the Company’s investments in agency MBS include price estimates obtained from third-party pricing services. In determining fair value, third-party pricing services use a market approach. The inputs used in the fair value measurements performed by the third-party pricing services are based upon readily observable transactions for securities with similar characteristics (such as issuer/guarantor, coupon rate, stated maturity, and collateral pool characteristics) occurring on the measurement date. The Company makes inquiries of the third-party pricing sources to understand the significant inputs and assumptions used to determine prices. The Company reviews the various third-party fair value estimates and performs procedures to validate their reasonableness, including comparison to recent trading activity for similar securities and an overall review for consistency with market conditions observed as of the measurement date.

Private-label MBS - The Company’s investments in private-label MBS are classified within Level 3 of the fair value hierarchy as private-label MBS trade infrequently and, therefore, the measurement of their fair value requires the use of significant unobservable inputs. In determining fair value, the Company primarily uses an income approach as well as market approaches. The Company utilizes present value techniques based on the estimated future cash flows of the instrument taking into consideration various assumptions derived by management based on their observations of assumptions used by market participants. These assumptions are corroborated by evidence such as historical collateral performance data, evaluation of historical collateral performance data for other securities with comparable or similar risk characteristics, and observed completed or pending transactions in similar instruments, when available. The significant inputs to the Company’s valuation process include collateral default, loss severity, prepayment, and discount rates (i.e., the rate of return demanded by market participants as of the measurement date). In general, significant increases (decreases) in default, loss severity, or discount rate assumptions, in isolation, would result in a significantly lower (higher) fair value measurement. However, significant increases (decreases) in prepayment rate assumptions, in isolation, may result in a significantly higher (lower) fair value measurement depending upon the instrument’s specific characteristics and the overall payment structure of the issuing securitization vehicle. It is difficult to generalize the interrelationships between these significant inputs as the actual results could differ considerably on an individual security basis. Therefore, each significant input is closely analyzed to ascertain its reasonableness for the Company’s purposes of fair value measurement.

Measuring fair value is inherently subjective given the volatile and sometimes illiquid markets for these private-label MBS and requires management to make a number of judgments about the assumptions that a market participant would use, including assumptions about the timing and amount of future cash flows as well as the rate of return required by market participants. The assumptions the Company applies are specific to each security. Although the Company relies on its internal calculations to estimate the fair value of these private-label MBS, the Company considers indications of value from actual sales of similar private-label MBS to assist in the valuation process and to calibrate the Company’s models.

Derivative instruments

Exchange-traded derivative instruments - Exchange-traded derivative instruments, which include Eurodollar futures, U.S. Treasury note futures, interest rate swap futures, and options on futures, are classified within Level 1 of the fair value hierarchy as they are measured using quoted prices for identical instruments in liquid markets.

Interest rate swaps - Interest rate swaps are classified within Level 2 of the fair value hierarchy. The fair values of the Company’s centrally cleared interest rate swaps are measured using the daily valuations reported by the clearinghouse through which the instrument was cleared. In performing its end-of-day valuations, the clearinghouse constructs forward interest rate curves (for example, three-month LIBOR forward rates) from its specific observations of that day’s trading activity. The clearinghouse uses the applicable forward interest rate curve to develop a market-based forecast of future remaining contractually required cash flows for each interest rate swap. Each market-based cash flow forecast is then discounted using the overnight index swap rate curve (sourced from the Federal Reserve Bank of New York) to determine a net present value amount which represents the instrument’s fair value. The Company reviews the valuations reported by the clearinghouse on an ongoing basis and performs procedures using readily available market data to independently verify their reasonableness.

Forward-settling purchases and sales of TBA securities – Forward-settling purchases and sales of TBA securities are classified within Level 2 of the fair value hierarchy. The fair value of each forward-settling TBA contract is measured using price estimates obtained from a third-party pricing service, which are based upon readily observable transaction prices occurring on the measurement date for forward-settling contracts to buy or sell TBA securities with the same guarantor, contractual maturity, and coupon rate for delivery on the same forward settlement date as the contract under measurement.

Other

Long-term unsecured debt - As of September 30, 2017 and December 31, 2016, the carrying value of the Company’s long-term unsecured debt was $73,824 and $73,656, respectively, net of unamortized debt issuance costs, and consists of Senior Notes and trust preferred debt issued by the Company. The Company’s estimate of the fair value of long-term unsecured debt is $71,152 and $66,489 as of September 30, 2017 and December 31, 2016, respectively. The Company’s Senior Notes, which are publicly traded on the New York Stock Exchange, are classified within Level 1 of the fair value hierarchy. Trust preferred debt is classified within Level 2 of the fair value hierarchy as the fair value is estimated based on the quoted prices of the Company’s publicly traded Senior Notes.

Investments in equity securities of non-public companies and investment funds - As of September 30, 2017 and December 31, 2016, the Company had investments in equity securities and investment funds with a carrying amount of $1,701 and $1,918, respectively, which are included in the line item “other assets” in the accompanying consolidated balance sheets.  As of September 30, 2017 and December 31, 2016, $444 and $533, respectively, of these investments represent securities for which the Company elected the “fair value option” at the time that the securities were initially recognized on the Company’s consolidated balance sheets; the Company measures the fair value of these securities on a recurring basis, recognizing the periodic change in fair value in earnings. The remaining $1,257 and $1,385 in investments in equity securities of non-public companies and investment funds as of September 30, 2017 and December 31, 2016, respectively, were measured at cost, net of impairments. The Company’s estimate of the fair value of investments in equity securities and investment funds is $6,205 and $6,034 as of September 30, 2017 and December 31, 2016, respectively. Investments in equity securities and investment funds are classified within Level 3 of the fair value hierarchy. The fair values of the Company’s investments in equity securities and investment funds are not readily determinable. Accordingly, for its investments in equity securities, the Company estimates fair value by estimating the enterprise value of the investee and then waterfalls the enterprise value over the investee’s securities in the order of their preference relative to one another. To estimate the enterprise value of the investee, the Company uses traditional valuation methodologies, including the consideration of recent investments in, or tender offers for, the equity securities of the investee. For its investments in investment funds, the Company estimates fair value based upon the investee’s net asset value per share.

Financial assets and liabilities for which carrying value approximates fair value - Cash and cash equivalents, deposits, receivables, repurchase agreements, payables, and other assets and liabilities are reflected in the consolidated balance sheets at their cost, which, due to the short-term nature of these instruments and their limited inherent credit risk, approximates fair value.

Fair Value Hierarchy

Financial Instruments Measured at Fair Value on a Recurring Basis

The following tables set forth financial instruments measured at fair value by level within the fair value hierarchy as of September 30, 2017 and December 31, 2016. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.

	September 30, 2017
	Total			Level 1		Level 2			Level 3
MBS
Trading:
Agency MBS	$	3,994,515		$	—	$	3,994,515		$	—
Private-label MBS		54			—		—			54
Total MBS		3,994,569			—		3,994,515			54
Derivative assets		4,177			821		3,356			—
Derivative liabilities		(7,146	)		—		(7,146	)		—
Other assets		444			—		—			444
Total	$	3,992,044		$	821	$	3,990,725		$	498

	December 31, 2016
	Total			Level 1			Level 2			Level 3
MBS
Trading:
Agency MBS	$	3,911,375		$	—		$	3,911,375		$	—
Private-label MBS		1,266			—			—			1,266
Total MBS		3,912,641			—			3,911,375			1,266
Derivative assets		74,889			4,289			70,600			—
Derivative liabilities		(9,554	)		(3,906	)		(5,648	)		—
Other assets		533			—			—			533
Total	$	3,978,509		$	383		$	3,976,327		$	1,799

There were no transfers of financial instruments into or out of Levels 1, 2 or 3 during the three and nine months ended September 30, 2017 or the year ended December 31, 2016.

Level 3 Financial Assets and Liabilities

The following table provides information about the significant unobservable inputs used to measure the fair value of the Company’s private-label MBS as of the dates indicated:

	September 30, 2017				December 31, 2016
	Weighted- average (1)		Range		Weighted- average (1)			Range
Discount rate		—		—		6.50	%	6.50 - 6.50 %
Default rate		—		—		2.25	%	2.25 - 2.25 %
Loss severity rate		—		—		45.00	%	45.00 - 45.00 %
Total prepayment rate (including defaults)		—		—		10.25	%	10.25 - 10.25 %

⁽¹⁾Based on face value.

The table below sets forth an attribution of the change in the fair value of the Company’s Level 3 investments that are measured at fair value on a recurring basis for the periods indicated:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Beginning balance	$	618		$	89,186		$	1,799		$	130,553
Total net gains (losses)
Included in investment gain (loss), net		(116	)		2,994			(55	)		537
Included in other comprehensive income		—			(3,325	)		—			(11,739	)
Purchases		—			—			—			5,357
Sales		—			(67,761	)		(1,268	)		(106,052	)
Payments, net		(6	)		(826	)		(60	)		(4,170	)
Accretion of discount		2			1,655			82			7,437
Ending balance	$	498		$	21,923		$	498		$	21,923
Net unrealized gains (losses) included in earnings for the    period for Level 3 assets still held at the reporting date	$	(116	)	$	(64	)	$	(113	)	$	(280	)

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Income Taxes

9 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

Income Taxes

Note 9. Income Taxes

Arlington Asset is subject to taxation as a corporation under Subchapter C of the Internal Revenue Code of 1986, as amended (the “Code”).  As of September 30, 2017, the Company had estimated net operating loss (“NOL”) carry-forwards of $69,720 that can be used to offset future taxable ordinary income.  The Company’s NOL carry-forwards begin to expire in 2027.  As of September 30, 2017, the Company had estimated net capital loss (“NCL”) carry-forwards of $309,751 that can be used to offset future net capital gains.  The scheduled expirations of the Company’s NCL carry-forwards are $136,505 in 2019, $102,927 in 2020, and $70,319 in 2021.  The Company is subject to federal alternative minimum tax (“AMT”) and state and local taxes on its taxable income and gains that are not offset by its NOL and NCL carry-forwards.  As of September 30, 2017, the Company had estimated AMT credit carry-forwards of $8,952 that can be used to offset future taxable ordinary income.  The AMT credit carry-forwards do not expire.

Income taxes are provided for using the asset and liability method.  Deferred tax assets and liabilities reflect the impact of temporary differences between the carrying amount of assets and liabilities pursuant to the application of GAAP and their respective tax bases and are stated at tax rates expected to be in effect when the taxes are actually paid or recovered.  Deferred tax assets are also recognized for NOL carry-forwards, NCL carry-forwards and any tax credit carry-forwards.  

A valuation allowance is provided against the deferred tax asset if, based upon the Company’s evaluation, it is more-likely-than-not that some or all of the deferred tax assets will not be realized.  All available evidence, both positive and negative, is incorporated into the determination of whether a valuation allowance for deferred tax assets is appropriate.  Items considered in the valuation allowance determination include expectations of future earnings of the appropriate tax character, recent historical financial results, tax planning strategies, the length of statutory carry-forward periods and the expected timing of the reversal of temporary differences.  As of September 30, 2017, the Company determined that it should record a full valuation allowance against its deferred tax assets that are capital in nature, which consists of its NCL carry-forwards and temporary GAAP to tax differences that are expected to result in capital losses in future periods.  As of September 30, 2017, the Company determined that it should not record any valuation allowance against its deferred tax assets that are ordinary in nature, which consists of its NOL carry-forwards, tax credit carry-forwards and temporary GAAP to tax differences that are expected to result in deductions from ordinary income in future periods. For the three months ended September 30, 2017, the Company recorded a decrease to its valuation allowance of $8,417, and for the nine months ended September 30, 2017, the Company recorded an increase to its valuation allowance of $11,541.

Deferred tax assets and liabilities consisted of the following as of the dates indicated:

	September 30, 2017			December 31, 2016
Ordinary deferred tax assets:
NOL carry-forward	$	27,121		$	37,238
AMT credit carry-forward		8,952			8,427
Deferred net loss on designated derivatives		6,717			1,386
Stock-based compensation		2,563			2,426
Other, net		137			208
Total ordinary deferred tax assets		45,490			49,685
Ordinary deferred tax liabilities:
Net unrealized gain on designated derivatives		(22,037	)		(25,145	)
Ordinary deferred tax assets, net		23,453			24,540
Capital deferred tax assets:
NCL carry-forward		120,493			120,939
Net unrealized loss on investments		31,951			44,253
Valuation allowance		(152,444	)		(140,903	)
Total capital deferred tax assets, net		—			24,289
Total deferred tax assets, net	$	23,453		$	48,829

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Earnings (Loss) Per Share

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Earnings (Loss) Per Share

Note 10. Earnings (Loss) Per Share

Basic earnings per share includes no dilution and is computed by dividing net income or loss applicable to common stock by the weighted-average number of common shares outstanding for the respective period. Diluted earnings per share includes the impact of dilutive securities such as unvested shares of restricted stock and performance share units. The following tables present the computations of basic and diluted earnings (loss) per share for the periods indicated:

	Three Months Ended September 30,				Nine Months Ended September 30,
(Shares in thousands)	2017		2016		2017		2016
Basic weighted-average common shares outstanding		26,377		23,038		24,793		23,011
Performance share units and unvested restricted stock		479		311		350		143
Diluted weighted-average common shares outstanding		26,856		23,349		25,143		23,154
Net income attributable to common stock	$	22,785	$	18,813	$	10,076	$	89
Basic earnings per common share	$	0.86	$	0.82	$	0.41	$	-
Diluted earnings per common share	$	0.85	$	0.81	$	0.40	$	-

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Stockholders' Equity

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Stockholders' Equity

Note 11. Stockholders’ Equity

Common Stock

The Company has authorized share capital of 450,000,000 shares of Class A common stock, par value $0.01 per share, and 100,000,000 shares of Class B common stock, par value $0.01 per share.  Holders of the Class A and Class B common stock are entitled to one vote and three votes per share, respectively, on all matters voted upon by the shareholders. Shares of Class B common stock are convertible into shares of Class A common stock on a one-for-one basis at the option of the Company in certain circumstances including either (i) upon sale or other transfer, or (ii) at the time the holder of such shares of Class B common stock ceases to be employed by the Company.  

During the nine months ended September 30, 2017 and during the year ended December 31, 2016, holders of the Company's Class B common stock converted an aggregate of 20,256 and 81,960 shares of Class B common stock into 20,256 and 81,960 shares of Class A common stock, respectively.  As of September 30, 2017, all remaining shares of Class B common stock had been exchanged for shares of the Company’s Class A common stock.

Preferred Stock

The Company has authorized share capital of 2,000,000 shares of 7.00% Series B Cumulative Perpetual Redeemable Preferred Stock (the “Series B Preferred Stock”), par value of $.01 per share, and 100,000 authorized and unissued shares designated as Series A Preferred Stock, and 22,900,000 shares of undesignated preferred stock. The Company’s Board of Directors has the authority, without further action by the shareholders, to issue additional preferred stock in one or more series and to fix the terms and rights of the preferred stock.

In May 2017, the Company completed a public offering in which 135,000 shares of its Series B Preferred Stock were issued to the public at a public offering price of $24.00 per share for proceeds net of underwriting discounts and commissions and expenses of $3,018.  The Series B Preferred Stock is publicly traded on the New York Stock Exchange under the ticker symbol “AI PrB.”

The Series B Preferred Stock has no stated maturity, is not subject to any sinking fund and will remain outstanding indefinitely unless repurchased or redeemed by the Company. Holders of Series B Preferred Stock have no voting rights, except under limited conditions, and are entitled to receive a cumulative cash dividend at a rate of 7.00% per annum of their $25.00 per share liquidation preference before holders of common stock are entitled to receive any dividends. Shares of Series B Preferred Stock are redeemable at $25.00 per share, plus accumulated and unpaid dividends (whether or not authorized or declared) exclusively at our option commencing on May 12, 2022 or earlier upon the occurrence of a change in control. Dividends are payable quarterly in arrears on the 30th day of each December, March, June and September. As of September 30, 2017, we had declared and paid all required quarterly dividends on our Series B Preferred Stock.

Common Stock Dividends

Pursuant to the Company’s variable dividend policy for its common stock, the Board of Directors evaluates common stock dividends on a quarterly basis and, in its sole discretion, approves the payment of dividends. The Company’s common stock dividend payments, if any, may vary significantly from quarter to quarter. The Board of Directors has approved and the Company has declared and paid the following dividends on its common stock to date in 2017:

Quarter Ended	Dividend Amount		Declaration Date	Record Date	Pay Date
September 30	$	0.550	September 14	September 29	October 31
June 30		0.550	June 16	June 30	July 31
March 31		0.625	March 14	March 31	April 28

The Board of Directors approved and the Company declared and paid the following dividends for 2016:

Quarter Ended	Dividend Amount		Declaration Date	Record Date	Pay Date
December 31	$	0.625	December 16	December 30	January 31, 2017
September 30		0.625	September 15	September 30	October 31
June 30		0.625	June 17	June 30	July 29
March 31		0.625	March 15	March 31	April 29

Equity Distribution Agreements

On May 24, 2013, the Company entered into separate equity distribution agreements (the “Prior Equity Distribution Agreements”) with each of RBC Capital Markets, LLC, JMP Securities LLC, Ladenburg Thalmann & Co. Inc. and MLV & Co. LLC (the “Prior Equity Sales Agents”), pursuant to which the Company may offer and sell, from time to time, up to 1,750,000 shares of the Company’s Class A common stock. Pursuant to the Prior Equity Distribution Agreements, shares of the Company’s common stock may be offered and sold through the Prior Equity Sales Agents in transactions that are deemed to be “at the market” offerings as defined in Rule 415 under the Securities Act of 1933, including sales made directly on the NYSE or sales made to or through a market maker other than on an exchange or, subject to the terms of a written notice from the Company, in privately negotiated transactions.  

During the three months ended March 31, 2017, the Company issued 800 shares of Class A common stock at a weighted average public offering price of $15.16 per share for proceeds net of underwriting discounts and commissions and expenses of $12 under the Prior Equity Distribution Agreements.  On February 23, 2017, the Company terminated the Prior Equity Distribution Agreements.

On February 22, 2017, the Company entered into new separate equity distribution agreements (the “New Equity Distribution Agreements”) with each of JMP Securities LLC, FBR Capital Markets & Co., JonesTrading Institutional Services LLC and Ladenburg Thalmann & Co. Inc. (the “New Equity Sales Agents”), pursuant to which the Company may offer and sell, from time to time, up to 6,000,000 shares of the Company’s Class A common stock. Pursuant to the New Equity Distribution Agreements, shares of the Company’s common stock may be offered and sold through the New Equity Sales Agents in transactions that are deemed to be “at the market” offerings as defined in Rule 415 under the Securities Act of 1933, including sales made directly on the NYSE or sales made to or through a market maker other than on an exchange or, subject to the terms of a written notice from the Company, in privately negotiated transactions.

The following table provides information about the issuances of common stock under the New Equity Distribution Agreements:

Class A Common Stock Issuances	Three Months Ended September 30, 2017		Nine Months Ended September 30, 2017
Shares issued		2,037,348		4,368,837
Weighted average public offering price	$	13.21	$	13.90
Net proceeds (1)	$	26,567	$	59,901

(1) Net of selling commissions and expenses.

As of September 30, 2017, the Company had 1,631,163 shares of Class A common stock available for sale under the New Equity Distribution Agreements.

On May 16, 2017, the Company entered into an equity distribution agreement (the “Series B Preferred Equity Distribution Agreement”) with JonesTrading Institutional Services LLC (the “Series B Preferred Equity Agent”), pursuant to which the Company may offer and sell, from time to time, up to 1,865,000 shares of the Company’s Series B Preferred Stock. Pursuant to the Series B Preferred Equity Distribution Agreement, shares of the Company’s Series B Preferred stock may be offered and sold through the Series B Preferred Equity Sales Agent in transactions that are deemed to be “at the market” offerings as defined in Rule 415 under the Securities Act of 1933, including sales made directly on the NYSE or sales made to or through a market maker other than on an exchange or, subject to the terms of a written notice from the Company, in privately negotiated transactions.

The following table provides information about the issuances of preferred stock under the Series B Preferred Equity Distribution Agreement:

Series B Preferred Stock Issuances	Three Months Ended September 30, 2017		Nine Months Ended September 30, 2017
Shares issued		138,683		159,993
Weighted average public offering price	$	25.03	$	24.95
Net proceeds (1)	$	3,404	$	3,886

(1) Net of selling commissions and expenses.

As of September 30, 2017, the Company had 1,705,007 shares of Series B Preferred stock available for sale under the Series B Preferred Equity Distribution Agreement.

Share Repurchase Program

The Company’s Board of Directors authorized a share repurchase program pursuant to which the Company may repurchase up to 2,000,000 shares of Class A common stock (the “Repurchase Program”). Repurchases under the Repurchase Program may be made from time to time on the open market and in private transactions at management’s discretion in accordance with applicable federal securities laws. The timing of repurchases and the exact number of shares of Class A common stock to be repurchased will depend upon market conditions and other factors. The Repurchase Program is funded using the Company’s cash on hand and cash generated from operations. The Repurchase Program has no expiration date and may be suspended or terminated at any time without prior notice. As of September 30, 2017, there remain available for repurchase 1,951,305 shares of Class A common stock under the Repurchase Program.

Shareholder Rights Agreement

The Board of Directors adopted and the Company’s shareholders approved a shareholder rights agreement (“Rights Plan”). Under the terms of the Rights Plan, in general, if a person or group acquires or commences a tender or exchange offer for beneficial ownership of 4.9% or more of the outstanding shares of our Class A common stock upon a determination by our Board of Directors (an “Acquiring Person”), all of our other Class A and Class B common shareholders will have the right to purchase securities from us at a discount to such securities’ fair market value, thus causing substantial dilution to the Acquiring Person.

The Board of Directors adopted the Rights Plan in an effort to protect against a possible limitation on the Company’s ability to use its NOL carry-forwards, NCL carry-forwards, and built-in losses under Sections 382 and 383 of the Code. The Company’s ability to use its NOLs, NCLs and built-in losses would be limited if it experienced an “ownership change” under Section 382 of the Code. In general, an “ownership change” would occur if there is a cumulative change in the ownership of the Company’s common stock of more than 50% by one or more “5% shareholders” during a three-year period. The Rights Plan was adopted to dissuade any person or group from acquiring 4.9% or more of the Company’s outstanding Class A common stock, each, an Acquiring Person, without the approval of the Board of Directors and triggering an “ownership change” as defined by Section 382.

The Rights Plan and any outstanding rights will expire at the earliest of (i) June 4, 2019, (ii) the time at which the rights are redeemed or exchanged pursuant to the Rights Plan, (iii) the repeal of Section 382 and 383 of the Code or any successor statute if the Board of Directors determines that the Rights Plan is no longer necessary for the preservation of the applicable tax benefits, and (iv) the beginning of a taxable year to which the Board of Directors determines that no applicable tax benefits may be carried forward.

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Revisions to Previously Reported Financial Statements

9 Months Ended

Sep. 30, 2017

Accounting Changes And Error Corrections [Abstract]

Revisions to Previously Reported Financial Statements

Note 12. Revisions to Previously Reported Financial Statements

During the second quarter of 2017, the Company concluded that the previously reported deferred tax assets, net, and accumulated deficit were incorrect for the three months ended March 31, 2017 and for the five fiscal years ended December 31, 2016 with a corresponding effect on the previously reported income tax benefit and net income for the fiscal year ended December 31, 2012. Although the impact of this change was not material to the consolidated financial statements for the five fiscal years ended December 31, 2016 and for the three months ended March 31, 2017, the Company has revised its previously reported consolidated financial statements for those periods to reflect the cumulative impact of the errors. The following tables set forth the affected line items within the Company’s previously reported consolidated financial statements for the periods indicated:

	As of March 31, 2017
	As Previously Reported			Adjustment			As Revised
Consolidated Balance Sheets:
Deferred tax assets, net	$	65,149		$	(24,603	)	$	40,546
Total assets		4,720,492			(24,603	)		4,695,889
Accumulated deficit		(1,536,949	)		(24,603	)		(1,561,552	)
Total stockholders' equity		374,481			(24,603	)		349,878
Total liabilities and stockholders' equity		4,720,492			(24,603	)		4,695,889

	As of December 31, 2016
	As Previously Reported			Adjustment			As Revised
Consolidated Balance Sheets:
Deferred tax assets, net	$	73,432		$	(24,603	)	$	48,829
Total assets		4,141,554			(24,603	)		4,116,951
Accumulated deficit		(1,527,104	)		(24,603	)		(1,551,707	)
Total stockholders' equity		383,416			(24,603	)		358,813
Total liabilities and stockholders' equity		4,141,554			(24,603	)		4,116,951

	As of December 31, 2015
	As Previously Reported			Adjustment			As Revised
Consolidated Balance Sheets:
Deferred tax assets, net	$	97,530		$	(24,603	)	$	72,927
Total assets		4,202,939			(24,603	)		4,178,336
Accumulated deficit		(1,426,655	)		(24,603	)		(1,451,258	)
Total stockholders' equity		484,031			(24,603	)		459,428
Total liabilities and stockholders' equity		4,202,939			(24,603	)		4,178,336

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Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2017

Cash Equivalents

Cash Equivalents

Cash equivalents include demand deposits with banks, money market accounts and highly liquid investments with original maturities of three months or less. As of September 30, 2017 and December 31, 2016, approximately 98% and 99%, respectively, of the Company’s cash equivalents were invested in money market funds that invest primarily in U.S. Treasuries and other securities backed by the U.S. government.

Investment Security Purchases and Sales

Investment Security Purchases and Sales

Purchases and sales of investment securities are recorded on the settlement date of the transfer unless the trade qualifies as a “regular-way” trade and the associated commitment qualifies for an exemption from the accounting guidance applicable to derivative instruments. A regular-way trade is an investment security purchase or sale transaction that is expected to settle within the period of time following the trade date that is prevalent or traditional for that specific type of security. Any amounts payable or receivable for unsettled security trades are recorded as “sold securities receivable” or “purchased securities payable” in the consolidated balance sheets.

Interest Income Recognition for Investments in Agency MBS

Interest Income Recognition for Investments in Agency MBS

The Company recognizes interest income for its investments in agency MBS by applying the “interest method” permitted by GAAP, whereby purchase premiums and discounts are amortized and accreted, respectively, as an adjustment to contractual interest income accrued at each security’s stated coupon rate. The interest method is applied at the individual security level based upon each security’s effective interest rate. The Company calculates each security’s effective interest rate at the time of purchase by solving for the discount rate that equates the present value of that security's remaining contractual cash flows (assuming no principal prepayments) to its purchase price. Because each security’s effective interest rate does not reflect an estimate of future prepayments, the Company refers to this manner of applying the interest method as the “contractual effective interest method.” When applying the contractual effective interest method to its investments in agency MBS, as principal prepayments occur, a proportional amount of the unamortized premium or discount is recognized in interest income such that the effective interest rate on the remaining security balance is unaffected.

Interest Income Recognition for Investments in Private-Label MBS

Interest Income Recognition for Investments in Private-Label MBS

The Company’s investments in private-label MBS were generally acquired at significant discounts to their par values due in large part to an expectation that the Company will be unable to collect all of the contractual cash flows of the securities. Investments in private-label MBS acquired prior to 2015 were classified as available-for-sale, all of which had been sold as of December 31, 2016. The Company has elected to classify its investments in private-label MBS acquired in 2015 or later as trading securities. Interest income from investments in private-label MBS is recognized using a prospective level-yield methodology which is based upon each security’s effective interest rate. The amount of periodic interest income recognized is determined by applying the security’s effective interest rate to its amortized cost basis or reference amount. At the time of acquisition, the security’s effective interest rate is calculated by solving for the single discount rate that equates the present value of the Company’s best estimate of the amount and timing of the cash flows expected to be collected from the security to its purchase price. To prepare its best estimate of cash flows expected to be collected, the Company develops a number of assumptions about the future performance of the pool of mortgage loans that serve as collateral for its investment, including assumptions about the timing and amount of prepayments and credit losses.

In each subsequent quarterly reporting period, the amount and timing of cash flows expected to be collected from the security are re-estimated based upon current information and events. The following table provides a description of how periodic changes in the estimate of cash flows expected to be collected affect interest income recognition prospectively for investments in private-label MBS that are classified as available-for-sale and trading securities, respectively:

	Effect on Interest Income Recognition for Investments in Private-Label MBS Classified as:
Scenario:	Available-for-Sale	Trading
A positive change in cash flows occurs. Actual cash flows exceed prior estimates and/or a positive change occurs in the estimate of expected remaining cash flows.	If the positive change in cash flows is deemed significant, a revised effective interest rate is calculated and applied prospectively such that the positive change is recognized as incremental interest income over the remaining life of the security. This revised effective interest rate is also used in subsequent periods to determine if any declines in the fair value of that security are other-than-temporary.	A revised effective interest rate is calculated and applied prospectively such that the positive change in cash flows is recognized as incremental interest income over the remaining life of the security.
An adverse change in cash flows occurs. Actual cash flows fall short of prior estimates and/or an adverse change occurs in the estimate of expected remaining cash flows.	The security’s effective interest rate is unaffected. If an adverse change in cash flows occurs for a security that is impaired (that is, its fair value is less than its amortized cost basis), the impairment is considered other-than-temporary due to the occurrence of a credit loss. If a credit loss occurs, the Company writes-down the amortized cost basis of the security to an amount equal to the present value of cash flows expected to be collected, discounted at the security’s existing effective interest rate, and recognizes a corresponding other-than-temporary impairment charge in earnings as a component of “investment gain (loss), net.”	The amount of periodic interest income recognized over the remaining life of the security will be reduced accordingly. Specifically, if an adverse change in cash flows occurs for a security that is impaired (that is, its fair value is less than its reference amount), the reference amount to which the security’s existing effective interest rate will be prospectively applied will be reduced to the present value of cash flows expected to be collected, discounted at the security’s existing effective interest rate. If an adverse change in cash flows occurs for a security that is not impaired, the security’s effective interest rate will be reduced accordingly and applied on a prospective basis.

Other Comprehensive Income

Other Comprehensive Income

Comprehensive income includes net income as currently reported by the Company on the consolidated statements of comprehensive income adjusted for other comprehensive income. Other comprehensive income for the Company represents periodic unrealized holding gains and losses related to the Company’s investments in MBS classified as available-for-sale. Accumulated unrealized holding gains and losses for available-for-sale MBS are reclassified into net income as a component of “investment gain (loss), net” upon (i) sale or realization, or (ii) the occurrence of an other-than-temporary impairment. As of December 31, 2016 all of the Company’s investments in MBS are classified as trading securities. Accordingly, all unrealized gains and losses related to the Company’s investments in MBS during 2017 have been recognized in net income.

Other Significant Accounting Policies

Other Significant Accounting Policies

Certain of the Company’s other significant accounting policies are summarized in the following notes:

Investments in agency MBS, subsequent measurement	Note 3
Investments in private-label MBS, subsequent measurement	Note 4
Borrowings	Note 5
To-be-announced agency MBS transactions, including “dollar rolls”	Note 6
Derivative instruments	Note 6
Balance sheet offsetting	Note 7
Fair value measurements	Note 8

Refer to the Company’s 2016 Annual Report on Form 10-K for a complete inventory and summary of the Company’s significant accounting policies.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

The following table provides a brief description of recently issued accounting pronouncements and their actual or expected effect on the Company’s consolidated financial statements:

Standard	Description	Date of Adoption	Effect on the Consolidated Financial Statements
Recently Adopted Accounting Guidance
ASU No. 2016-07, Simplifying the Transition to the Equity Method of Accounting (Topic 323)	This amendment eliminates the requirement that when an investment qualifies for use of the equity method as a result of an increase in the level of ownership interest or degree of influence, an investor must adjust the investment, results of operations, and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods that the investment had been held.	January 1, 2017	The adoption of ASU No. 2016-07 did not impact the Company’s consolidated financial statements.
ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting (Topic 718)	This amendment was issued with the objective of simplifying several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. Some of the areas for simplification apply only to nonpublic entities.	January 1, 2017	The adoption of ASU No. 2016-07 did not have a material impact on the Company’s consolidated financial statements.
Recently Issued Accounting Guidance Not Yet Adopted
ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date	This amendment defers the effective date of ASU No. 2014-09 for all entities by one year. ASU No. 2014-09 requires entities to recognize revenue to depict the transfer of promised goods or services to customers in amounts that reflect the consideration to which the entity expects to be entitled in exchange for those goods or services. Revenue recognition with respect to financial instruments is not within the scope of ASU No. 2014-09.	January 1, 2018	The Company does not expect that the adoption of ASU No. 2015-14 will have a material impact on its consolidated financial statements.
ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (Subtopic 825-10)	This amendment makes targeted changes to certain aspects of guidance applicable to financial assets and financial liabilities. The amendment primarily affects accounting for certain equity investments, financial liabilities measured under the fair value option, and certain financial instrument presentation and disclosure requirements. Accounting for investments in debt securities and financial liabilities not measured under the fair value option is largely unaffected by this amendment.	January 1, 2018	ASU No. 2016-01 requires entities to measure investments in equity securities at fair value, unless fair value measurement is impractical, with changes in fair value recognized in current period earnings.  Upon the adoption of ASU No. 2016-01, the Company will recognize the difference between the fair value of its investments in equity securities currently carried at their historical cost (net of impairments) and the securities’ fair value in net income.  As of September 30, 2017, the Company’s investments in equity securities measured at cost have a balance sheet carrying value of $1,257 and an estimated fair value of $5,761.
ASU No. 2016-02, Leases (Topic 842)	This amendment replaces the existing lease accounting model with a revised model.  The primary change effectuated by the revised lease accounting model is the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases.	January 1, 2019	The Company is currently evaluating the impact of this amendment on its consolidated financial statements.
ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 606)	The amendments in this update require financial assets measured at amortized cost as well as available-for-sale debt securities to be measured for impairment on the basis of the net amount expected to be collected.  Credit losses are to be recognized through an allowance for credit losses, which differs from the direct write-down of the amortized cost basis currently required for other-than-temporary impairments of investments in debt securities.  This update also makes substantial changes to the manner in which interest income is to be recognized for financial assets acquired with a more-than-insignificant amount of credit deterioration since origination. This update will not affect the accounting for investments in debt securities that are classified as trading securities.	January 1, 2019	As of September 30, 2017, all of the Company’s investments in debt securities are classified as trading securities. Accordingly, the Company does not expect ASU No. 2016-13 to have a material impact on its consolidated financial statements.
ASU No. 2016-15, Classification of Certain Cash Receipts and Cash Payments (Topic 230)	This amendment was issued to reduce diversity in practice with respect to eight various statement of cash flow reporting issues for which existing GAAP is either unclear or does not provide specific guidance.	January 1, 2018	The Company does not expect that the adoption of ASU No. 2016-15 will have a material impact on the classification of cash inflows or outflows within its consolidated statement of cash flows.
ASU No. 2017-08, Premium Amortization of Purchased Callable Debt Securities (Subtopic 310-20)	This amendment requires purchase premiums for investments in debt securities that are noncontingently callable by the issuer (at a fixed price and preset date) to be amortized to the earliest call date. Previously, purchase premiums for such investments were permitted to be amortized to the instrument’s maturity date.	January 1, 2020	Investments in prepayable financial assets, such as residential MBS, for which the embedded call options are not held by the issuer are not within the scope of ASU No. 2017-08. Accordingly, the Company does not expect the adoption of ASU No. 2017-08 to have a material effect on its consolidated financial statements.

Repurchase Agreements

The Company finances the purchase of MBS through repurchase agreements, which are accounted for as collateralized borrowing arrangements. In a repurchase transaction, the Company sells MBS to a counterparty under a master repurchase agreement in exchange for cash and concurrently agrees to repurchase the same security at a future date in an amount equal to the cash initially exchanged plus an agreed-upon amount of interest. MBS sold under agreements to repurchase remain on the Company’s consolidated balance sheets because the Company maintains effective control over such securities throughout the duration of the arrangement. Throughout the contractual term of a repurchase agreement, the Company recognizes a “repurchase agreement” liability on its consolidated balance sheets to reflect the obligation to repay to the counterparty the proceeds received upon the initial transfer of the MBS. The difference between the proceeds received by the Company upon the initial transfer of the MBS and the contractually agreed-upon repurchase price is recognized as interest expense over the term of the repurchase arrangement on a level-yield basis.

Derivative Instruments

In the normal course of its operations, the Company is a party to financial instruments that are accounted for as derivative instruments. Derivative instruments are recorded at fair value as either “derivative assets” or “derivative liabilities” in the consolidated balance sheets, with all periodic changes in fair value reflected as a component of “investment gain (loss), net” in the consolidated statements of comprehensive income. Cash receipts or payments related to derivative instruments are classified as investing activities within the consolidated statements of cash flows.

In addition to interest rate derivatives that are used for interest rate risk management, the Company is a party to derivative instruments that economically serve as investments, such as forward contracts to purchase fixed-rate “pass-through” agency MBS on a non-specified pool basis, which are known as to-be-announced (“TBA”) contracts. A TBA contract is a forward contract for the purchase or sale of a fixed-rate agency MBS at a predetermined price, face amount, issuer, coupon, and stated maturity for settlement on an agreed upon future date. The specific agency MBS that will be delivered to satisfy the TBA trade is not known at the inception of the trade. The Company accounts for TBA contracts as derivative instruments because the Company cannot assert that it is probable at inception and throughout the term of an individual TBA contract that its settlement will result in physical delivery of the underlying agency MBS, or the individual TBA contract will not settle in the shortest time period possible.

Derivatives, Offsetting of Financial Assets and Liabilities

The agreements that govern certain of the Company’s derivative instruments and collateralized short-term financing arrangements provide for a right of setoff in the event of default or bankruptcy with respect to either party to such transactions. The Company presents derivative assets and liabilities as well as collateralized short-term financing arrangements on a gross basis.

Receivables recognized for the right to reclaim cash initial margin posted in respect of interest rate derivative instruments are included in the line item “deposits, net” in the accompanying consolidated balance sheets. Prior to January 1, 2017, the daily exchange of variation margin associated with centrally cleared derivative instruments was considered a pledge of collateral. For these prior periods, receivables recognized for the right to reclaim cash variation margin posted in respect of interest rate derivative instruments are included in the line item “deposits, net” in the accompanying consolidated balance sheets. The Company elected to offset any payables recognized for the obligation to return cash variation margin received from an interest rate derivative instrument counterparty against receivables recognized for the right to reclaim cash initial margin posted by the Company to that same counterparty.

Beginning on January 1, 2017, as a result of a CME amendment to their rule book which governs their central clearing activities, the daily exchange of variation margin associated with a centrally cleared derivative instrument is legally characterized as the daily settlement of the derivative instrument itself, as opposed to a pledge of collateral. Accordingly, beginning in 2017, the Company accounts for the daily receipt or payment of variation margin associated with its centrally cleared interest rate swaps as a direct reduction to the carrying value of the interest rate swap derivative asset or liability, respectively. Beginning in 2017, the carrying amount of centrally cleared interest rate swaps reflected in the Company’s consolidated balance sheets is equal to the unsettled fair value of such instruments; because variation margin is exchanged on a one-day lag, the unsettled fair value of such instruments represents the change in fair value that occurred on the last day of the reporting period.

Fair Value of Financial Instruments

The accounting principles related to fair value measurements define fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Financial Accounting Standards Board Accounting Standards Codification Topic 820, Fair Value Measurements and Disclosures, establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels, giving the highest priority to quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3) as described below:

Level 1 Inputs -  Unadjusted quoted prices in active markets for identical assets or liabilities that are accessible by the Company at the measurement date;

Level 2 Inputs -  Quoted prices in markets that are not active or financial instruments for which all significant inputs are observable, either directly or indirectly; and

Level 3 Inputs -  Unobservable inputs for the asset or liability, including significant judgments made by the Company about the assumptions that a market participant would use.

The Company measures the fair value of the following assets and liabilities:

Agency MBS

Investment Security Purchases and Sales

The Company’s investments in agency MBS are reported in the accompanying consolidated balance sheets at fair value. As of September 30, 2017 and December 31, 2016, the Company had $3,994,515 and $3,911,375, respectively, of fair value in agency MBS classified as trading securities.

Private-Label MBS

Investment Security Purchases and Sales

The Company’s investments in private-label MBS are reported in the accompanying consolidated balance sheets at fair value. Investments in private-label MBS acquired prior to 2015 were classified as available-for-sale, all of which had been sold as of December 31, 2016. The Company has elected to classify its investments in private-label MBS acquired in 2015 or later as trading securities.

The Company evaluates available-for-sale MBS for other-than-temporary impairment on a quarterly basis. When the fair value of an available-for-sale security is less than its amortized cost at the quarterly reporting date, the security is considered impaired. Impairments determined to be other-than-temporary are recognized as a direct write-down to the security’s amortized cost basis with a corresponding charge recognized in earnings as a component of “investment gain (loss), net.” An impairment is considered other-than-temporary when (i) the Company intends to sell the impaired security, (ii) the Company more-likely-than not will be required to sell the impaired security prior to the recovery of its amortized cost basis, or (iii) a credit loss exists. A credit loss exists when the present value of the Company’s estimate of the cash flows expected to be collected from the security, discounted at the security’s existing effective interest rate, is less than the security’s amortized cost basis.

If the Company intends to sell an impaired security or it more-likely-than-not will be required to sell an impaired security before recovery of its amortized cost basis, the Company writes-down the amortized cost basis of the security to an amount equal to the security’s fair value and recognizes a corresponding other-than-temporary impairment charge in earnings as a component of “investment gain (loss), net.” If a credit loss exists for an impaired security that the Company does not intend to sell nor will it likely be required to sell prior to recovery, the Company writes-down the amortized cost basis of the security to an amount equal to the present value of cash flows expected to be collected, discounted at the security’s existing effective interest rate, and recognizes a corresponding other-than-temporary impairment charge in earnings as a component of “investment gain (loss), net.”

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Investments in Agency MBS (Tables)

9 Months Ended

Sep. 30, 2017

Agency MBS

Additional Information Realized Gain Loss on Investments

The following table provides additional information about the gains and losses recognized as a component of “investment gain (loss), net” in the Company’s consolidated statements of comprehensive income for the periods indicated with respect to investments in agency MBS classified as trading securities:

	Three Months Ended September 30,					Nine Months Ended September 30,
	2017		2016			2017		2016
Net gains (losses) recognized in earnings for:
Agency MBS still held at period end	$	12,715	$	2,960		$	22,178	$	56,079
Agency MBS sold during the period		1,296		(428	)		3,421		25,195
Total	$	14,011	$	2,532		$	25,599	$	81,274

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Investments in Private-Label MBS (Tables)

9 Months Ended

Sep. 30, 2017

Realized Gain (Loss) on Investments

The following table presents the results of sales of available-for-sale private-label MBS for the periods indicated:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Proceeds from sales	$	—	$	67,761	$	—	$	96,171
Gross realized gains		—		2,440		—		2,466
Gross realized losses		—		1		—		620

Other than Temporary Impairment, Credit Losses Recognized in Earnings

The following table presents a summary of cumulative credit related other-than-temporary impairment charges recognized on the available-for-sale private-label MBS held as of the dates indicated:

	Three Months Ended September 30,					Nine Months Ended September 30,
	2017		2016			2017		2016
Cumulative credit related other-than-temporary    impairments, beginning balance	$	—	$	15,754		$	—	$	14,017
Additions for:
Securities for which other-than-temporary    impairments have not previously occurred		—		—			—		1,737
Securities with previously recognized other-than-    temporary impairments		—		—			—		—
Reductions for sold or matured securities		—		(2,035	)		—		(2,035	)
Cumulative credit related other-than-temporary    impairments, ending balance	$	—	$	13,719		$	—	$	13,719

Private-Label MBS

Additional Information Realized Gain Loss on Investments

The following table provides additional information about the net gains and losses recognized as a component of “investment gain (loss), net” for the periods indicated with respect to investments in private-label MBS classified as trading securities:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Net gains (losses) recognized in earnings for:
Private-label MBS still held at period end	$	(15	)	$	(64	)	$	(24	)	$	(280	)
Private-label MBS sold during the period		—			—			57			89
Total	$	(15	)	$	(64	)	$	33		$	(191	)

Private-Label MBS | Available-for-sale Securities

Private Label MBS Available for Sale Accretable Yield

The following table presents the changes in the accretable yield solely for available-for-sale private-label MBS for the periods indicated:

	Three Months Ended September 30,					Nine Months Ended September 30,
	2017		2016			2017		2016
Beginning balance	$	—	$	48,199		$	—	$	85,052
Accretion		—		(1,449	)		—		(6,470	)
Reclassifications, net		—		24			—		(11,853	)
Eliminations in consolidation		—		—			—		(3,515	)
Sales		—		(37,346	)		—		(53,786	)
Ending balance	$	—	$	9,428		$	—	$	9,428

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Borrowings (Tables)

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Schedule of Repurchase Agreements

As of September 30, 2017 and December 31, 2016, the Company had no amount at risk with a single repurchase agreement counterparty or lender greater than 10% of equity. The following table provides information regarding the Company’s outstanding repurchase agreement borrowings as of the dates indicated:

	September 30, 2017			December 31, 2016
Pledged with agency MBS:
Repurchase agreements outstanding	$	3,694,838		$	3,649,102
Agency MBS collateral, at fair value		3,873,154			3,851,269
Net amount (1)		178,316			202,167
Weighted-average rate		1.33	%		0.96	%
Weighted-average term to maturity	11.9 days			19.3 days

⁽¹⁾ Net amount represents the value of collateral in excess of corresponding repurchase obligation. The amount of collateral at-risk is limited to the outstanding repurchase obligation and not the entire collateral balance.

The following table provides information regarding the Company’s outstanding repurchase agreement borrowings during the three and nine months ended September 30, 2017 and 2016:

	September 30, 2017			September 30, 2016
Weighted-average outstanding balance during the three months ended	$	3,819,095		$	3,519,719
Weighted-average rate during the three months ended		1.31	%		0.69	%
Weighted-average outstanding balance during the nine months ended	$	3,956,579		$	3,345,259
Weighted-average rate during the nine months ended		1.10	%		0.67	%

Schedule of Long-term Unsecured Debt Instruments

As of September 30, 2017 and December 31, 2016, the Company had $73,824 and $73,656, respectively, of outstanding long-term unsecured debentures, net of unamortized debt issuance costs of $1,476 and $1,644, respectively. The Company’s long-term debentures consisted of the following as of the dates indicated:

	September 30, 2017									December 31, 2016
	Senior Notes Due 2025			Senior Notes Due 2023			Trust Preferred Debt			Senior Notes Due 2025			Senior Notes Due 2023			Trust Preferred Debt
Outstanding Principal	$	35,300		$	25,000		$	15,000		$	35,300		$	25,000		$	15,000
Annual Interest Rate		6.75	%		6.625	%	LIBOR+ 2.25 - 3.00 %				6.75	%		6.625	%	LIBOR+ 2.25 - 3.00 %
Interest Payment Frequency	Quarterly			Quarterly			Quarterly			Quarterly			Quarterly			Quarterly
Weighted-Average Interest Rate		6.75	%		6.625	%		4.05	%		6.75	%		6.625	%		3.63	%
Maturity	March 15, 2025			May 1, 2023			2033 - 2035			March 15, 2025			May 1, 2023			2033 - 2035
Early Redemption Date	March 15, 2018			May 1, 2016			2008 - 2010			March 15, 2018			May 1, 2016			2008 - 2010

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Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Schedule of Derivative Instruments

The following table presents the fair value of the Company’s derivative instruments as of the dates indicated:

	September 30, 2017					December 31, 2016
	Assets		Liabilities			Assets		Liabilities
Interest rate swaps	$	3,348	$	—		$	63,315	$	(1,949	)
10-year U.S. Treasury note futures		820		—			—		—
Options on 10-year U.S. Treasury note futures		1		—			4,289		(3,906	)
Options on agency MBS		8		—			—		—
TBA commitments		—		(7,146	)		7,285		(3,699	)
Total	$	4,177	$	(7,146	)	$	74,889	$	(9,554	)

Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location

The following tables provide information about the derivative gains and losses recognized within the periods indicated:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Interest rate derivatives:
Interest rate swaps:
Net interest expense (1)	$	(4,198	)	$	(5,126	)	$	(14,900	)	$	(13,499	)
Unrealized gains (losses), net		10,833			15,426			(7,991	)		(65,519	)
Losses realized upon early termination		(14,137	)		(300	)		(13,441	)		(300	)
Total interest rate swap (losses) gains, net		(7,502	)		10,000			(36,332	)		(79,318	)
U.S. Treasury note futures, net		(133	)		—			(2,174	)		(63,285	)
Options on U.S. Treasury note futures, net		(147	)		(1,631	)		(6,300	)		(7,880	)
Other, net		(221	)		—			(221	)		(25	)
Total interest rate derivative (losses) gains, net		(8,003	)		8,369			(45,027	)		(150,508	)
TBA and specified agency MBS commitments:
TBA dollar roll income (2)		6,424			5,321			14,120			12,835
Other gains on agency MBS commitments, net		1,007			1,506			962			17,728
Total gains on agency MBS commitments, net		7,431			6,827			15,082			30,563
Total derivative (losses) gains, net	$	(572	)	$	15,196		$	(29,945	)	$	(119,945	)

(1) Represents the periodic net interest settlement incurred during the period (often referred to as “net interest carry”). Beginning in 2017, also includes “price alignment interest” income earned or expense incurred on cumulative variation margin paid or received, respectively, associated with centrally cleared interest rate swap agreements.

(2) Represents the price discount of forward-settling TBA purchases relative to a contemporaneously executed “spot” TBA sale, which economically equates to net interest income that is earned ratably over the period beginning on the settlement date of the sale and ending on the settlement date of the forward-settling purchase.

Derivative Instrument Volume of Activity

The following tables summarize the volume of activity, in terms of notional amount, related to derivative instruments for the periods indicated:

	For the Three Months Ended September 30, 2017
	Beginning of Period		Additions		Scheduled Settlements			Early Terminations			End of Period
Interest rate swaps	$	3,850,000	$	500,000	$	—		$	(500,000	)	$	3,850,000
10-year U.S. Treasury note futures		350,000		351,000		(351,000	)		—			350,000
Purchased call options on 10-year U.S. Treasury note   futures		700,000		950,000		(1,500,000	)		—			150,000
Purchased put options on agency MBS		—		700,000		—			—			700,000
Commitments to purchase (sell) MBS, net		1,110,000		4,160,000		(3,915,000	)		—			1,355,000

	For the Three Months Ended September 30, 2016
	Beginning of Period		Additions		Scheduled Settlements			Early Terminations			End of Period
Interest rate swaps	$	2,250,000	$	1,250,000	$	—		$	(375,000	)	$	3,125,000
10-year U.S. Treasury note futures		—		15,000		(15,000	)		—			—
Purchased put options on 10-year U.S. Treasury note   futures		2,000,000		2,100,000		(3,500,000	)		—			600,000
Sold call options on 10-year U.S. Treasury note futures		—		1,000,000		(400,000	)		—			600,000
Purchased call options on 10-year U.S. Treasury note   futures		—		500,000		(200,000	)		—			300,000
Commitments to purchase (sell) MBS, net		875,441		2,675,000		(2,425,441	)		—			1,125,000

	For the Nine Months Ended September 30, 2017
	Beginning of Period		Additions		Scheduled Settlements			Early Terminations			End of Period
Interest rate swaps	$	3,700,000	$	1,275,000	$	—		$	(1,125,000	)	$	3,850,000
10-year U.S. Treasury note futures		—		1,196,100		(846,100	)		—			350,000
Purchased put options on 10-year U.S. Treasury note   futures		1,650,000		2,540,000		(4,190,000	)		—			—
Sold call options on 10-year U.S. Treasury note futures		1,000,000		2,450,000		(3,450,000	)		—			—
Purchased call options on 10-year U.S. Treasury note   futures		1,000,000		3,350,000		(4,200,000	)		—			150,000
Purchased put options on agency MBS		—		700,000		—			—			700,000
Commitments to purchase (sell) MBS, net		725,000		8,475,000		(7,845,000	)		—			1,355,000

	For the Nine Months Ended September 30, 2016
	Beginning of Period		Additions		Scheduled Settlements			Early Terminations			End of Period
Interest rate swaps	$	1,500,000	$	2,000,000	$	—		$	(375,000	)	$	3,125,000
10-year U.S. Treasury note futures		1,335,000		1,386,000		(2,133,500	)		(587,500	)		—
Purchased put options on 10-year U.S. Treasury note   futures		—		8,100,000		(7,500,000	)		—			600,000
Sold call options on 10-year U.S. Treasury note futures		—		1,000,000		(400,000	)		—			600,000
Purchased call options on 10-year U.S. Treasury note   futures		—		500,000		(200,000	)		—			300,000
Put options on Eurodollar futures		4,000,000		—		(4,000,000	)		—			—
Commitments to purchase (sell) MBS, net		375,000		6,225,441		(5,475,441	)		—			1,125,000

Derivative and Other Financial Instrument Cash Collateral

The following table presents information about the cash collateral posted and received by the Company in respect of its derivative and other financial instruments, which is included in the line item “deposits, net” in the accompanying consolidated balance sheets, for the dates indicated:

	September 30, 2017		December 31, 2016
Cash collateral posted for:
Interest rate swaps (cash initial margin)	$	49,518	$	65,728
U.S. Treasury note futures and options on U.S. Treasury note   futures (cash initial margin)		4,035		5,314
Unsettled MBS trades and TBA commitments, net		5,764		1,474
Total cash collateral posted		59,317		72,516
Cash collateral received for interest rate swaps (1)		—		(61,367	)
Total cash collateral posted, net	$	59,317	$	11,149

(1) Beginning in 2017, the Company accounts for the daily receipt or payment of cash variation margin associated with centrally cleared interest rate swaps as a legal settlement of the derivative instrument itself, as opposed to a pledge of collateral.

Put and Call Options on 10-year U.S. Treasury Note Futures

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Schedule of Derivative Instruments

Information about the Company’s outstanding options on 10-year U.S. Treasury note futures contracts as of September 30, 2017 is as follows:

	Notional Amount		Weighted-average Strike Price		Implied Strike Rate (1)			Net Fair Value
Purchased call options:
October 2017 expiration	$	150,000		133.0		1.49	%	$	1

(1) The implied strike rate is estimated based upon the weighted average strike price per contract and the price of an equivalent 10-year U.S. Treasury note futures contract.

Information about the Company’s outstanding options on 10-year U.S. Treasury note futures contracts as of December 31, 2016 is as follows:

	Notional Amount			Weighted-average Strike Price		Implied Strike Rate (1)			Net Fair Value
Purchased put options:
January 2017 expiration	$	950,000			120.8		2.87	%	$	539
February 2017 expiration		700,000			122.6		2.64	%		3,281
Total / weighted average for purchased put options	$	1,650,000			121.6		2.77	%	$	3,820
Sold call options:
January 2017 expiration	$	(100,000	)		126.0		2.25	%	$	(141	)
February 2017 expiration		(900,000	)		126.0		2.24	%		(3,765	)
Total / weighted average for sold call options	$	(1,000,000	)		126.0		2.24	%	$	(3,906	)
Purchased call options:
January 2017 expiration	$	1,000,000			127.1		2.12	%	$	469
									$	383

(1) The implied strike rate is estimated based upon the weighted average strike price per contract and the price of an equivalent 10-year U.S. Treasury note futures contract.

Options on Agency MBS

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Schedule of Derivative Instruments

Information about the Company’s outstanding options on agency MBS as of September 30, 2017 is as follows:

	Notional Amount		Weighted-average Strike Price		Underlying Agency MBS Coupon			Net Fair Value
Purchased put options:
October 2017 expiration	$	500,000		102.5		4.00	%	$	-
November 2017 expiration		200,000		103.5		4.00	%		8
Total / weighted average for purchased put options	$	700,000		102.8		4.00	%	$	8

TBA Commitments

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Schedule of Derivative Instruments

The following tables present information about the Company’s TBA commitments as of the dates indicated:

	September 30, 2017
	Notional Amount: Net Purchase (Sale) Commitment			Contractual Forward Price			Market Price			Fair Value
Dollar roll positions:
3.0% coupon purchase commitments	$	200,000		$	202,258		$	200,563		$	(1,695	)
3.5% coupon purchase commitments		1,005,000			1,040,762			1,036,092			(4,670	)
4.0% coupon purchase commitments		250,000			263,929			263,164			(765	)
4.0% coupon sale commitments		(100,000	)		(105,250	)		(105,266	)		(16	)
Total TBA commitments, net	$	1,355,000		$	1,401,699		$	1,394,553		$	(7,146	)

	December 31, 2016
	Notional Amount: Net Purchase (Sale) Commitment			Contractual Forward Price			Market Price			Fair Value
Dollar roll positions:
3.0% coupon purchase commitments	$	725,000		$	718,887		$	720,027		$	1,140
3.5% coupon purchase commitments		25,000			25,586			25,613			27
3.5% coupon sale commitments		(25,000	)		(25,602	)		(25,613	)		(11	)
Total dollar roll positions, net		725,000			718,871			720,027			1,156
TBA commitments serving as economic hedges:
3.5% coupon purchase commitments		600,000			608,601			614,719			6,118
3.5% coupon sale commitments		(600,000	)		(611,031	)		(614,719	)		(3,688	)
Total economic hedges, net		—			(2,430	)		—			2,430
Total TBA commitments, net	$	725,000		$	716,441		$	720,027		$	3,586

Interest Rate Swap

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Schedule of Derivative Instruments

The following table presents information about the Company’s interest rate swap agreements that were in effect as of September 30, 2017:

			Weighted-average:
	Notional Amount		Fixed Pay Rate			Variable Receive Rate			Net Receive (Pay) Rate			Remaining Life (Years)		Fair Value
Years to maturity:
Less than 3 years	$	1,300,000		1.26	%		1.32	%		0.06	%		1.7	$	447
3 to less than 7 years		700,000		1.87	%		1.32	%		(0.55	)%		4.1		844
7 to 10 years		1,600,000		1.90	%		1.32	%		(0.58	)%		8.5		1,963
Total / weighted-average	$	3,600,000		1.66	%		1.32	%		(0.34	)%		5.2	$	3,254

The following table presents information about the Company’s interest rate swap agreements that were in effect as of December 31, 2016:

			Weighted-average:
	Notional Amount		Fixed Pay Rate			Variable Receive Rate			Net (Pay) Rate			Remaining Life (Years)		Fair Value
Years to maturity:
Less than 3 years	$	1,375,000		1.10	%		0.97	%		(0.13	)%		1.7	$	6,470
3 to less than 7 years		350,000		1.84	%		1.00	%		(0.84	)%		3.7		(769	)
7 to 10 years		1,600,000		1.93	%		0.96	%		(0.97	)%		9.2		50,511
Total / weighted-average	$	3,325,000		1.58	%		0.97	%		(0.61	)%		5.5	$	56,212

Forward-Starting Interest Rate Swap

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Schedule of Derivative Instruments

The following table presents information about the Company’s forward-starting interest rate swap agreements that had yet to take effect as of September 30, 2017:

			Weighted-average:
	Notional Amount		Fixed Pay Rate			Term After Effective Date (Years)		Fair Value
Effective in October 2017	$	250,000		1.12	%		2.0	$	94

The following table presents information about the Company’s forward-starting interest rate swap agreements that had yet to take effect as of December 31, 2016:

			Weighted-average:
	Notional Amount		Fixed Pay Rate			Term After Effective Date (Years)		Fair Value
Effective in September / October 2017	$	375,000		1.13	%		2.0	$	5,154

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Offsetting of Financial Assets and Liabilities (Tables)

9 Months Ended

Sep. 30, 2017

Offsetting [Abstract]

Offsetting of Financial Assets and Liabilities

The following tables present information, as of the dates indicated, about the Company’s derivative instruments, short-term borrowing arrangements, and associated collateral, including those subject to master netting (or similar) arrangements:

	As of September 30, 2017
	Gross Amount Recognized		Amount Offset in the Consolidated Balance Sheets		Net Amount Presented in the Consolidated Balance Sheets		Gross Amount Not Offset in the Consolidated Balance Sheets						Net Amount
							Financial Instruments (1)			Cash Collateral (2)
Assets:
Derivative instruments:
Options on U.S. Treasury note futures	$	1	$	—	$	1	$	—		$	—		$	1
U.S. Treasury note futures		820		—		820		—			(820	)		—
Interest rate swaps		3,348		—		3,348		—			(3,348	)		—
Options on agency MBS		8		—		8		—			—			8
Total derivative instruments		4,177		—		4,177		—			(4,168	)		9
Total assets	$	4,177	$	—	$	4,177	$	—		$	(4,168	)	$	9
Liabilities:
Unsettled MBS trades and TBA   commitments, net (3)	$	7,146	$	—	$	7,146	$	—		$	(5,764	)	$	1,382
Repurchase agreements		3,694,838		—		3,694,838		(3,694,838	)		—			—
Total liabilities	$	3,701,984	$	—	$	3,701,984	$	(3,694,838	)	$	(5,764	)	$	1,382

	As of December 31, 2016
	Gross Amount Recognized		Amount Offset in the Consolidated Balance Sheets			Net Amount Presented in the Consolidated Balance Sheets		Gross Amount Not Offset in the Consolidated Balance Sheets						Net Amount
								Financial Instruments (1)			Cash Collateral (2)
Assets:
Derivative instruments:
Options on U.S. Treasury note futures	$	4,289	$	—		$	4,289	$	(3,906	)	$	—		$	383
Interest rate swaps		63,315		—			63,315		(1,949	)		(61,366	)		—
TBA commitments		7,285		—			7,285		—			—			7,285
Total derivative instruments		74,889		—			74,889		(5,855	)		(61,366	)		7,668
Deposits, net		72,516		(61,367	)		11,149		—			—			11,149
Total assets	$	147,405	$	(61,367	)	$	86,038	$	(5,855	)	$	(61,366	)	$	18,817
Liabilities:
Derivative instruments:
Options on U.S. Treasury note futures	$	3,906	$	—		$	3,906	$	(3,906	)	$	—		$	—
Interest rate swaps		1,949		—			1,949		(1,949	)		—			—
TBA commitments		3,699		—			3,699		—			(1,474	)		2,225
Total derivative instruments		9,554		—			9,554		(5,855	)		(1,474	)		2,225
Deposits, net		61,367		(61,367	)		—		—			—			—
Repurchase agreements		3,649,102		—			3,649,102		(3,649,102	)		—			—
Total liabilities	$	3,720,023	$	(61,367	)	$	3,658,656	$	(3,654,957	)	$	(1,474	)	$	2,225

⁽¹⁾ Does not include the fair value amount of financial instrument collateral pledged in respect of repurchase agreements that exceeds the associated liability presented in the consolidated balance sheets.

⁽²⁾ Does not include the amount of cash collateral pledged in respect of derivative instruments that exceeds the associated derivative liability presented in the consolidated balance sheets.

⁽³⁾ The “Gross Amount Recognized” and “Net Amount Presented in the Consolidated Balances Sheets” excludes the fair value of unsettled agency MBS purchases and sales recognized on their respective trade dates.

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements, Recurring and Nonrecurring

The following tables set forth financial instruments measured at fair value by level within the fair value hierarchy as of September 30, 2017 and December 31, 2016. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.

	September 30, 2017
	Total			Level 1		Level 2			Level 3
MBS
Trading:
Agency MBS	$	3,994,515		$	—	$	3,994,515		$	—
Private-label MBS		54			—		—			54
Total MBS		3,994,569			—		3,994,515			54
Derivative assets		4,177			821		3,356			—
Derivative liabilities		(7,146	)		—		(7,146	)		—
Other assets		444			—		—			444
Total	$	3,992,044		$	821	$	3,990,725		$	498

	December 31, 2016
	Total			Level 1			Level 2			Level 3
MBS
Trading:
Agency MBS	$	3,911,375		$	—		$	3,911,375		$	—
Private-label MBS		1,266			—			—			1,266
Total MBS		3,912,641			—			3,911,375			1,266
Derivative assets		74,889			4,289			70,600			—
Derivative liabilities		(9,554	)		(3,906	)		(5,648	)		—
Other assets		533			—			—			533
Total	$	3,978,509		$	383		$	3,976,327		$	1,799

Fair Value Inputs, Assets, Quantitative Information

The following table provides information about the significant unobservable inputs used to measure the fair value of the Company’s private-label MBS as of the dates indicated:

	September 30, 2017				December 31, 2016
	Weighted- average (1)		Range		Weighted- average (1)			Range
Discount rate		—		—		6.50	%	6.50 - 6.50 %
Default rate		—		—		2.25	%	2.25 - 2.25 %
Loss severity rate		—		—		45.00	%	45.00 - 45.00 %
Total prepayment rate (including defaults)		—		—		10.25	%	10.25 - 10.25 %

⁽¹⁾Based on face value.

Fair Value, Measured on Recurring Basis

The table below sets forth an attribution of the change in the fair value of the Company’s Level 3 investments that are measured at fair value on a recurring basis for the periods indicated:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Beginning balance	$	618		$	89,186		$	1,799		$	130,553
Total net gains (losses)
Included in investment gain (loss), net		(116	)		2,994			(55	)		537
Included in other comprehensive income		—			(3,325	)		—			(11,739	)
Purchases		—			—			—			5,357
Sales		—			(67,761	)		(1,268	)		(106,052	)
Payments, net		(6	)		(826	)		(60	)		(4,170	)
Accretion of discount		2			1,655			82			7,437
Ending balance	$	498		$	21,923		$	498		$	21,923
Net unrealized gains (losses) included in earnings for the    period for Level 3 assets still held at the reporting date	$	(116	)	$	(64	)	$	(113	)	$	(280	)

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Income Taxes (Tables)

9 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

Schedule of Deferred Tax Assets and Liabilities

Deferred tax assets and liabilities consisted of the following as of the dates indicated:

	September 30, 2017			December 31, 2016
Ordinary deferred tax assets:
NOL carry-forward	$	27,121		$	37,238
AMT credit carry-forward		8,952			8,427
Deferred net loss on designated derivatives		6,717			1,386
Stock-based compensation		2,563			2,426
Other, net		137			208
Total ordinary deferred tax assets		45,490			49,685
Ordinary deferred tax liabilities:
Net unrealized gain on designated derivatives		(22,037	)		(25,145	)
Ordinary deferred tax assets, net		23,453			24,540
Capital deferred tax assets:
NCL carry-forward		120,493			120,939
Net unrealized loss on investments		31,951			44,253
Valuation allowance		(152,444	)		(140,903	)
Total capital deferred tax assets, net		—			24,289
Total deferred tax assets, net	$	23,453		$	48,829

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Earnings (Loss) Per Share (Tables)

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Computations of Basic and Diluted Earnings (Loss) Per Share

The following tables present the computations of basic and diluted earnings (loss) per share for the periods indicated:

	Three Months Ended September 30,				Nine Months Ended September 30,
(Shares in thousands)	2017		2016		2017		2016
Basic weighted-average common shares outstanding		26,377		23,038		24,793		23,011
Performance share units and unvested restricted stock		479		311		350		143
Diluted weighted-average common shares outstanding		26,856		23,349		25,143		23,154
Net income attributable to common stock	$	22,785	$	18,813	$	10,076	$	89
Basic earnings per common share	$	0.86	$	0.82	$	0.41	$	-
Diluted earnings per common share	$	0.85	$	0.81	$	0.40	$	-

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Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2017

Schedule of Dividends Payable

The Board of Directors has approved and the Company has declared and paid the following dividends on its common stock to date in 2017:

Quarter Ended	Dividend Amount		Declaration Date	Record Date	Pay Date
September 30	$	0.550	September 14	September 29	October 31
June 30		0.550	June 16	June 30	July 31
March 31		0.625	March 14	March 31	April 28

The Board of Directors approved and the Company declared and paid the following dividends for 2016:

Quarter Ended	Dividend Amount		Declaration Date	Record Date	Pay Date
December 31	$	0.625	December 16	December 30	January 31, 2017
September 30		0.625	September 15	September 30	October 31
June 30		0.625	June 17	June 30	July 29
March 31		0.625	March 15	March 31	April 29

New Equity Distribution Agreements

Issuances of Stock under Equity Distribution Agreements

The following table provides information about the issuances of common stock under the New Equity Distribution Agreements:

Class A Common Stock Issuances	Three Months Ended September 30, 2017		Nine Months Ended September 30, 2017
Shares issued		2,037,348		4,368,837
Weighted average public offering price	$	13.21	$	13.90
Net proceeds (1)	$	26,567	$	59,901

(1) Net of selling commissions and expenses.

Series B Preferred Equity Distribution Agreement

Issuances of Stock under Equity Distribution Agreements

The following table provides information about the issuances of preferred stock under the Series B Preferred Equity Distribution Agreement:

Series B Preferred Stock Issuances	Three Months Ended September 30, 2017		Nine Months Ended September 30, 2017
Shares issued		138,683		159,993
Weighted average public offering price	$	25.03	$	24.95
Net proceeds (1)	$	3,404	$	3,886

(1) Net of selling commissions and expenses.

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Revisions to Previously Reported Financial Statements (Tables)

9 Months Ended

Sep. 30, 2017

Accounting Changes And Error Corrections [Abstract]

Schedule of Affected Line Items within Previously Reported Consolidated Financial Statements

The following tables set forth the affected line items within the Company’s previously reported consolidated financial statements for the periods indicated:

	As of March 31, 2017
	As Previously Reported			Adjustment			As Revised
Consolidated Balance Sheets:
Deferred tax assets, net	$	65,149		$	(24,603	)	$	40,546
Total assets		4,720,492			(24,603	)		4,695,889
Accumulated deficit		(1,536,949	)		(24,603	)		(1,561,552	)
Total stockholders' equity		374,481			(24,603	)		349,878
Total liabilities and stockholders' equity		4,720,492			(24,603	)		4,695,889

	As of December 31, 2016
	As Previously Reported			Adjustment			As Revised
Consolidated Balance Sheets:
Deferred tax assets, net	$	73,432		$	(24,603	)	$	48,829
Total assets		4,141,554			(24,603	)		4,116,951
Accumulated deficit		(1,527,104	)		(24,603	)		(1,551,707	)
Total stockholders' equity		383,416			(24,603	)		358,813
Total liabilities and stockholders' equity		4,141,554			(24,603	)		4,116,951

	As of December 31, 2015
	As Previously Reported			Adjustment			As Revised
Consolidated Balance Sheets:
Deferred tax assets, net	$	97,530		$	(24,603	)	$	72,927
Total assets		4,202,939			(24,603	)		4,178,336
Accumulated deficit		(1,426,655	)		(24,603	)		(1,451,258	)
Total stockholders' equity		484,031			(24,603	)		459,428
Total liabilities and stockholders' equity		4,202,939			(24,603	)		4,178,336

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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Summary Of Significant Accounting Policies [Line Items]
Cash Equivalents Percentage Held in Us Government Backed Securities	98.00%	99.00%
ASU No. 2016-01
Summary Of Significant Accounting Policies [Line Items]
Investments in equity securities at cost method, carrying value	$ 1,257
Investments in equity securities at cost method, estimated fair value	$ 5,761

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Investments in Agency MBS - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Agency MBS
Fair Value of MBS	$ 3,994,515	$ 3,911,375
Interest-only agency MBS
Trading securities		$ 1,923

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Investments in Agency MBS - Additional Information About Gains and Losses Recognized with Respect to Investments in MBS classified as trading securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net gains (losses) recognized in earnings for:
MBS sold during the period	$ 13,996	$ 2,468	$ 25,632	$ 81,083
Agency MBS
Net gains (losses) recognized in earnings for:
MBS still held at period end	12,715	2,960	22,178	56,079
MBS sold during the period	1,296	(428)	3,421	25,195
Total	$ 14,011	$ 2,532	$ 25,599	$ 81,274

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Investments in Private-Label MBS - Additional Information (Details) - Private-Label MBS - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Fair Value of MBS	$ 54,000		$ 54,000		$ 1,266,000
Available-for-sale	0		0		$ 0
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities	$ 0	$ 0	$ 0	$ 1,737,000

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Investments in Private-Label MBS - Results of Sales of Available-for-sale MBS (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016
Investments Debt And Equity Securities [Abstract]
Proceeds from sales	$ 67,761	$ 96,171
Gross realized gains	2,440	2,466
Gross realized losses	$ 1	$ 620

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Investments in Private-Label MBS - Changes in Accretable Yield Solely for Available-for-sale MBS (Details) - Available-for-sale Securities - Private-Label MBS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 0	$ 48,199	$ 0	$ 85,052
Accretion	0	(1,449)	0	(6,470)
Reclassifications, net	0	24	0	(11,853)
Eliminations in consolidation	0	(37,346)	0	(53,786)
Ending balance	0	9,428	0	9,428
Consolidation, Eliminations
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Eliminations in consolidation	$ 0	$ 0	$ 0	$ (3,515)

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Investments in Private-Label MBS - Cumulative Credit Related Other than Temporary Impairment Charges Recognized on Available-for-sale MBS (Details) - Available-for-sale Securities - Private-Label MBS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Cumulative credit related other-than-temporary impairments, beginning balance	$ 0	$ 15,754	$ 0	$ 14,017
Additions for:
Securities for which other-than-temporary impairments have not previously occurred	0	0	0	1,737
Securities with previously recognized other-than-temporary impairments	0	0	0	0
Reductions
Reductions for sold or matured securities	0	(2,035)	0	(2,035)
Cumulative credit related other-than-temporary impairments, ending balance	$ 0	$ 13,719	$ 0	$ 13,719

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Investments in Private-Label MBS - Additional Information Realized Gain Loss on Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net gains (losses) recognized in earnings for:
MBS sold during the period	$ 13,996	$ 2,468	$ 25,632	$ 81,083
Private-Label MBS
Net gains (losses) recognized in earnings for:
MBS still held at period end	(15)	(64)	(24)	(280)
MBS sold during the period			57	89
Total	$ (15)	$ (64)	$ 33	$ (191)

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Borrowings - Outstanding Repurchase Agreement Borrowings (Details) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2017	Dec. 31, 2016
Repurchase Agreement Counterparty [Line Items]
Repurchase agreements outstanding		$ 3,694,838	$ 3,649,102
Pledged with agency-backed MBS
Repurchase Agreement Counterparty [Line Items]
Repurchase agreements outstanding		3,694,838	3,649,102
MBS collateral, at fair value		3,873,154	3,851,269
Net amount	[1]	$ 178,316	$ 202,167
Weighted-average rate		1.33%	0.96%
Weighted-average term to maturity (in days)		12 days	20 days

[1] Net amount represents the value of collateral in excess of corresponding repurchase obligation. The amount of collateral at-risk is limited to the outstanding repurchase obligation and not the entire collateral balance.

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Borrowings - Information Regarding Outstanding Repurchase Agreement Borrowings During the Period (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Debt Disclosure [Abstract]
Weighted-average outstanding balance	$ 3,819,095	$ 3,519,719	$ 3,956,579	$ 3,345,259
Weighted-average rate	1.31%	0.69%	1.10%	0.67%

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Borrowings - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Debt Disclosure [Abstract]
Long-term unsecured debt	$ 73,824	$ 73,656
Net of unamortized debt issuance costs	$ 1,476	$ 1,644

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Borrowings - Long-term Unsecured Debt Instruments (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Senior Notes Due 2025
Debt Instrument [Line Items]
Outstanding Principal	$ 35,300	$ 35,300
Annual Interest Rate	6.75%	6.75%
Interest Payment Frequency	Quarterly	Quarterly
Weighted-Average Interest Rate	6.75%	6.75%
Maturity	Mar. 15, 2025	Mar. 15, 2025
Early Redemption Date	Mar. 15, 2018	Mar. 15, 2018
Senior Notes Due 2023
Debt Instrument [Line Items]
Outstanding Principal	$ 25,000	$ 25,000
Annual Interest Rate	6.625%	6.625%
Interest Payment Frequency	Quarterly	Quarterly
Weighted-Average Interest Rate	6.625%	6.625%
Maturity	May 01, 2023	May 01, 2023
Early Redemption Date	May 01, 2016	May 01, 2016
Trust Preferred Debt
Debt Instrument [Line Items]
Outstanding Principal	$ 15,000	$ 15,000
Interest Payment Frequency	Quarterly	Quarterly
Weighted-Average Interest Rate	4.05%	3.63%
Annual Interest Rate	LIBOR+ 2.25 - 3.00 %	LIBOR+ 2.25 - 3.00 %
Trust Preferred Debt | Minimum
Debt Instrument [Line Items]
Maturity	2033	2033
Early Redemption Date	2008	2008
Trust Preferred Debt | Maximum
Debt Instrument [Line Items]
Maturity	2035	2035
Early Redemption Date	2010	2010

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Derivative Instruments - Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Derivative Assets	$ 4,177	$ 74,889
Derivative Liabilities	(7,146)	(9,554)
Interest Rate Swap and Forward Starting Interest Rate Swap
Derivative Assets	3,348	63,315
Derivative Liabilities	0	(1,949)
10-year U.S. Treasury Note Futures
Derivative Assets	820	0
Derivative Liabilities	0	0
Options on 10-year U.S. Treasury Note Futures
Derivative Assets	1	4,289
Derivative Liabilities	0	(3,906)
Options on Agency MBS
Derivative Assets	8	0
Derivative Liabilities	0	0
TBA Commitments
Derivative Assets	0	7,285
Derivative Liabilities	$ (7,146)	$ (3,699)

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Derivative Instruments - Interest Rate Swap Agreements (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Asset	$ 4,177,000	$ 74,889,000
Fair Value, Liability	(7,146,000)	(9,554,000)
Interest Rate Swap
Notional Amount	$ 3,600,000,000	$ 3,325,000,000
Weighted-average: Fixed Pay Rate	1.66%	1.58%
Weighted-average: Variable Receive Rate	1.32%	0.97%
Weighted-average: Net Receive (Pay) Rate	(0.34%)	(0.61%)
Weighted-average: Remaining Life (in years)	5 years 2 months 12 days	5 years 6 months
Fair Value, Asset	$ 3,254,000	$ 56,212,000
Interest Rate Swap | Less Than Three Year Maturity
Notional Amount	$ 1,300,000,000	$ 1,375,000,000
Weighted-average: Fixed Pay Rate	1.26%	1.10%
Weighted-average: Variable Receive Rate	1.32%	0.97%
Weighted-average: Net Receive (Pay) Rate	0.06%	(0.13%)
Weighted-average: Remaining Life (in years)	1 year 8 months 12 days	1 year 8 months 12 days
Fair Value, Asset	$ 447,000	$ 6,470,000
Interest Rate Swap | Three To Less Than Seven Years Maturity
Notional Amount	$ 700,000,000	$ 350,000,000
Weighted-average: Fixed Pay Rate	1.87%	1.84%
Weighted-average: Variable Receive Rate	1.32%	1.00%
Weighted-average: Net Receive (Pay) Rate	(0.55%)	(0.84%)
Weighted-average: Remaining Life (in years)	4 years 1 month 7 days	3 years 8 months 12 days
Fair Value, Asset	$ 844,000
Fair Value, Liability		$ (769,000)
Interest Rate Swap | Seven To Ten Year Maturity
Notional Amount	$ 1,600,000,000	$ 1,600,000,000
Weighted-average: Fixed Pay Rate	1.90%	1.93%
Weighted-average: Variable Receive Rate	1.32%	0.96%
Weighted-average: Net Receive (Pay) Rate	(0.58%)	(0.97%)
Weighted-average: Remaining Life (in years)	8 years 6 months	9 years 2 months 12 days
Fair Value, Asset	$ 1,963,000	$ 50,511,000
Forward-Starting Interest Rate Swap | Effective in October 2017
Notional Amount	$ 250,000,000
Weighted-average: Fixed Pay Rate	1.12%
Weighted-average: Remaining Life (in years)	2 years
Fair Value, Asset	$ 94,000
Forward-Starting Interest Rate Swap | Effective In September / October 2017
Notional Amount		$ 375,000,000
Weighted-average: Fixed Pay Rate		1.13%
Weighted-average: Remaining Life (in years)		2 years
Fair Value, Asset		$ 5,154,000

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Derivative Instruments - Additional Information (Details) - 10-year U.S. Treasury Note Futures - USD ($)	9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Notional Amount	$ 350,000,000	$ 350,000,000	$ 0	$ 0	$ 0	$ 1,335,000,000
Maturity date	2017-12

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Derivative Instruments - Information of Outstanding Options (Details) - USD ($)		Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
10-year U.S. Treasury Note Futures
Derivative [Line Items]
Notional Amount		$ 350,000,000	$ 350,000,000	$ 0	$ 0	$ 0	$ 1,335,000,000
10-year U.S. Treasury Note Futures | Put Option | Long
Derivative [Line Items]
Notional Amount				$ 1,650,000,000
Weighted-average Strike Price				$ 121.6
Implied Strike Rate	[1]			2.77%
Net Fair Value				$ 3,820,000
10-year U.S. Treasury Note Futures | Call Options | Long
Derivative [Line Items]
Net Fair Value				383,000
10-year U.S. Treasury Note Futures | Call Options | Short
Derivative [Line Items]
Notional Amount				$ 1,000,000,000
Weighted-average Strike Price				$ 126.0
Implied Strike Rate	[1]			2.24%
Net Fair Value				$ (3,906,000)
10-year U.S. Treasury Note Futures | October 2017 Expiration | Purchased Call Options
Derivative [Line Items]
Notional Amount		$ 150,000,000
Weighted-average Strike Price		$ 133.0
Implied Strike Rate	[1]	1.49%
Net Fair Value		$ 1,000
10-year U.S. Treasury Note Futures | January 2017 Expiration | Put Option | Long
Derivative [Line Items]
Notional Amount				$ 950,000,000
Weighted-average Strike Price				$ 120.8
Implied Strike Rate	[1]			2.87%
Net Fair Value				$ 539,000
10-year U.S. Treasury Note Futures | January 2017 Expiration | Call Options | Long
Derivative [Line Items]
Notional Amount				$ 1,000,000,000
Weighted-average Strike Price				$ 127.1
Implied Strike Rate	[1]			2.12%
Net Fair Value				$ 469,000
10-year U.S. Treasury Note Futures | January 2017 Expiration | Call Options | Short
Derivative [Line Items]
Notional Amount				$ 100,000,000
Weighted-average Strike Price				$ 126.0
Implied Strike Rate	[1]			2.25%
Net Fair Value				$ (141,000)
10-year U.S. Treasury Note Futures | February 2017 Expiration | Put Option | Long
Derivative [Line Items]
Notional Amount				$ 700,000,000
Weighted-average Strike Price				$ 122.6
Implied Strike Rate	[1]			2.64%
Net Fair Value				$ 3,281,000
10-year U.S. Treasury Note Futures | February 2017 Expiration | Call Options | Short
Derivative [Line Items]
Notional Amount				$ 900,000,000
Weighted-average Strike Price				$ 126.0
Implied Strike Rate	[1]			2.24%
Net Fair Value				$ (3,765,000)
Options on Agency MBS | Put Option | Long
Derivative [Line Items]
Notional Amount		$ 700,000,000
Weighted-average Strike Price		$ 102.8
Underlying Agency MBS Coupon		4.00%
Net Fair Value		$ 8,000
Options on Agency MBS | October 2017 Expiration | Put Option | Long
Derivative [Line Items]
Notional Amount		$ 500,000,000
Weighted-average Strike Price		$ 102.5
Underlying Agency MBS Coupon		4.00%
Options on Agency MBS | November 2017 Expiration | Put Option | Long
Derivative [Line Items]
Notional Amount		$ 200,000,000
Weighted-average Strike Price		$ 103.5
Underlying Agency MBS Coupon		4.00%
Net Fair Value		$ 8,000

[1] The implied strike rate is estimated based upon the weighted average strike price per contract and the price of an equivalent 10-year U.S. Treasury note futures contract.

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Derivative Instruments - Information of Outstanding Options (Parenthetical) (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
10-year U.S. Treasury Note Futures
Derivative [Line Items]
Options maturity period	2017-12
10-year U.S. Treasury Note Futures | October 2017 Expiration | Call Options | Long
Derivative [Line Items]
Options maturity period	2017-10
10-year U.S. Treasury Note Futures | January 2017 Expiration | Call Options | Long
Derivative [Line Items]
Options maturity period		2017-01
10-year U.S. Treasury Note Futures | January 2017 Expiration | Call Options | Short
Derivative [Line Items]
Options maturity period		2017-01
10-year U.S. Treasury Note Futures | January 2017 Expiration | Put Option | Long
Derivative [Line Items]
Options maturity period		2017-01
10-year U.S. Treasury Note Futures | February 2017 Expiration | Call Options | Short
Derivative [Line Items]
Options maturity period		2017-02
10-year U.S. Treasury Note Futures | February 2017 Expiration | Put Option | Long
Derivative [Line Items]
Options maturity period		2017-02
Options on Agency MBS | October 2017 Expiration | Put Option | Long
Derivative [Line Items]
Options maturity period	2017-10
Options on Agency MBS | November 2017 Expiration | Put Option | Long
Derivative [Line Items]
Options maturity period	2017-11

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Derivative Instruments - TBA Commitments (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Asset	$ 4,177,000	$ 74,889,000
Fair Value, Liability	(7,146,000)	(9,554,000)
TBA Commitments
Notional Amount: Net Purchase Commitment	1,355,000,000	725,000,000
Contractual Forward Price	1,401,699,000	716,441,000
Market Price	1,394,553,000	720,027,000
Fair Value, Asset	0	7,285,000
Fair Value, Liability	(7,146,000)	(3,699,000)
Fair Value	(7,146,000)	3,586,000
TBA Commitments | Dollar Roll Positions Three Percent Coupon Purchase (Sale) Commitments
Notional Amount: Net Purchase Commitment	200,000,000	725,000,000
Contractual Forward Price	202,258,000	718,887,000
Market Price	200,563,000	720,027,000
Fair Value, Asset		1,140,000
Fair Value, Liability	(1,695,000)
TBA Commitments | Dollar Roll Positions Three Point Five Percent Coupon Purchase (Sale) Commitments, Purchase
Notional Amount: Net Purchase Commitment	1,005,000,000	25,000,000
Contractual Forward Price	1,040,762,000	25,586,000
Market Price	1,036,092,000	25,613,000
Fair Value, Asset		27,000
Fair Value, Liability	(4,670,000)
TBA Commitments | Dollar Roll Positions Four Point Zero Percent Coupon Purchase Commitments
Notional Amount: Net Purchase Commitment	250,000,000
Contractual Forward Price	263,929,000
Market Price	263,164,000
Fair Value, Liability	(765,000)
TBA Commitments | Dollar Roll Positions Four Point Zero Percent Coupon Purchase (Sale) Commitments, Sale
Notional Amount: Net Purchase Commitment	100,000,000
Contractual Forward Price	(105,250,000)
Market Price	(105,266,000)
Fair Value, Liability	$ (16,000)
TBA Commitments | Dollar Roll Positions Three Point Five Percent Coupon Purchase (Sale) Commitments, Sale
Notional Amount: Net Purchase Commitment		25,000,000
Contractual Forward Price		(25,602,000)
Market Price		(25,613,000)
Fair Value, Liability		(11,000)
TBA Commitments | Dollar Roll Positions
Notional Amount: Net Purchase Commitment		725,000,000
Contractual Forward Price		718,871,000
Market Price		720,027,000
Fair Value, Asset		1,156,000
TBA Commitments | Economic Hedges Three Point Five Percent Coupon Purchase (Sale) Commitments, Purchase
Notional Amount: Net Purchase Commitment		600,000,000
Contractual Forward Price		608,601,000
Market Price		614,719,000
Fair Value, Asset		6,118,000
TBA Commitments | Economic Hedges Three Point Five Percent Coupon Purchase (Sale) Commitments, Sale
Notional Amount: Net Purchase Commitment		600,000,000
Contractual Forward Price		(611,031,000)
Market Price		(614,719,000)
Fair Value, Liability		(3,688,000)
TBA Commitments | Economic Hedges
Notional Amount: Net Purchase Commitment		0
Contractual Forward Price		(2,430,000)
Fair Value, Asset		$ 2,430,000

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Derivative Instruments - Derivative Gains and Losses Recognized Within the Periods (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest rate derivative (losses) gains, net		$ (8,003)	$ 8,369	$ (45,027)	$ (150,508)
Total derivative (losses) gains, net		(572)	15,196	(29,945)	(119,945)
Interest Rate Swap (Losses) Gains, Net
Interest rate derivative (losses) gains, net		(7,502)	10,000	(36,332)	(79,318)
Interest Rate Swaps Net Interest Expense
Interest rate derivative (losses) gains, net	[1]	(4,198)	(5,126)	(14,900)	(13,499)
Interest Rate Swaps Unrealized (Gains) Losses, Net
Interest rate derivative (losses) gains, net		10,833	15,426	(7,991)	(65,519)
Interest Rate Swaps Losses Realized Upon Early Termination
Interest rate derivative (losses) gains, net		(14,137)	(300)	(13,441)	(300)
Options on US Treasury Note Futures
Interest rate derivative (losses) gains, net		(147)	(1,631)	(6,300)	(7,880)
Other, Net
Interest rate derivative (losses) gains, net		(221)	0	(221)	(25)
TBA and Specified Agency MBS Commitments
Gains (losses) on agency commitments		7,431	6,827	15,082	30,563
TBA Dollar Roll Income
Gains (losses) on agency commitments	[2]	6,424	5,321	14,120	12,835
Other Gains on Agency MBS Commitments
Gains (losses) on agency commitments		1,007	1,506	962	17,728
U.S. Treasury Note Futures
Interest rate derivative (losses) gains, net		$ (133)	$ 0	$ (2,174)	$ (63,285)

[1] Represents the periodic net interest settlement incurred during the period (often referred to as “net interest carry”). Beginning in 2017, also includes “price alignment interest” income earned or expense incurred on cumulative variation margin paid or received, respectively, associated with centrally cleared interest rate swap agreements.

[2] Represents the price discount of forward-settling TBA purchases relative to a contemporaneously executed “spot” TBA sale, which economically equates to net interest income that is earned ratably over the period beginning on the settlement date of the sale and ending on the settlement date of the forward-settling purchase.

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Derivative Instruments - Volume of Activity, in terms of Notional Amount, Related to Derivative Instruments (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest Rate Swap and Forward Starting Interest Rate Swap
Derivative [Line Items]
Beginning of Period	$ 3,850,000,000	$ 2,250,000,000	$ 3,700,000,000	$ 1,500,000,000
Additions	500,000,000	1,250,000,000	1,275,000,000	2,000,000,000
Scheduled Settlements	0	0	0	0
Early Terminations	(500,000,000)	(375,000,000)	(1,125,000,000)	(375,000,000)
End of Period	3,850,000,000	3,125,000,000	3,850,000,000	3,125,000,000
10-year U.S. Treasury Note Futures
Derivative [Line Items]
Beginning of Period	350,000,000	0	0	1,335,000,000
Additions	351,000,000	15,000,000	1,196,100,000	1,386,000,000
Scheduled Settlements	(351,000,000)	(15,000,000)	(846,100,000)	(2,133,500,000)
Early Terminations	0	0	0	(587,500,000)
End of Period	350,000,000	0	350,000,000	0
Purchased Call Options on Ten Year U.S. Treasury Note Futures
Derivative [Line Items]
Beginning of Period	700,000,000	0	1,000,000,000	0
Additions	950,000,000	500,000,000	3,350,000,000	500,000,000
Scheduled Settlements	(1,500,000,000)	(200,000,000)	(4,200,000,000)	(200,000,000)
Early Terminations	0	0	0	0
End of Period	150,000,000	300,000,000	150,000,000	300,000,000
Purchased Put Options on Agency MBS
Derivative [Line Items]
Beginning of Period	0		0
Additions	700,000,000		700,000,000
Scheduled Settlements	0		0
Early Terminations	0		0
End of Period	700,000,000		700,000,000
Commitments To Purchase (sell) MBS
Derivative [Line Items]
Beginning of Period	1,110,000,000	875,441,000	725,000,000	375,000,000
Additions	4,160,000,000	2,675,000,000	8,475,000,000	6,225,441,000
Scheduled Settlements	(3,915,000,000)	(2,425,441,000)	(7,845,000,000)	(5,475,441,000)
Early Terminations	0	0	0	0
End of Period	1,355,000,000	1,125,000,000	1,355,000,000	1,125,000,000
Purchased Put Options on 10-Year U.S. Treasury Note Futures
Derivative [Line Items]
Beginning of Period		2,000,000,000	1,650,000,000	0
Additions		2,100,000,000	2,540,000,000	8,100,000,000
Scheduled Settlements		(3,500,000,000)	(4,190,000,000)	(7,500,000,000)
Early Terminations		0	0	0
End of Period	0	600,000,000	0	600,000,000
Sold Call Options on Ten Year U.S. Treasury Note Futures
Derivative [Line Items]
Beginning of Period		0	1,000,000,000	0
Additions		1,000,000,000	2,450,000,000	1,000,000,000
Scheduled Settlements		(400,000,000)	(3,450,000,000)	(400,000,000)
Early Terminations		0	0	0
End of Period	$ 0	600,000,000	$ 0	600,000,000
Put Options on Eurodollar Futures
Derivative [Line Items]
Beginning of Period				4,000,000,000
Additions				0
Scheduled Settlements				(4,000,000,000)
Early Terminations				0
End of Period		$ 0		$ 0

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Derivative Instruments - Cash Collateral Posted and Received in Respect of Derivative and Other Financial Instruments (Details) - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Cash collateral posted		$ 59,317	$ 72,516
Cash collateral received for interest rate swaps	[1]		(61,367)
Total cash collateral posted, net		59,317	11,149
Interest Rate Swap
Cash collateral posted		49,518	65,728
U.S. Treasury Note Futures and Options on U.S. Treasury Note Futures
Cash collateral posted		4,035	5,314
Unsettled MBS Trades and TBA Commitments, Net
Cash collateral posted		$ 5,764	$ 1,474

[1] Beginning in 2017, the Company accounts for the daily receipt or payment of cash variation margin associated with centrally cleared interest rate swaps as a legal settlement of the derivative instrument itself, as opposed to a pledge of collateral.

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Offsetting of Financial Assets and Liabilities - Derivative Instruments and Short-term Borrowing Arrangements, including those Subject to Master Netting or Similar Arrangements (Details) - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Derivative instruments:
Derivative Asset, Gross Amount Recognized		$ 4,177	$ 74,889
Derivative Asset, Amount Offset		0	0
Derivative Asset, Net Amount		4,177	74,889
Derivative Asset, Financial Instruments	[1]	0	(5,855)
Derivative Asset, Cash Collateral	[2]	(4,168)	(61,366)
Derivative Asset, Net amount Total		9	7,668
Derivative instruments:
Derivative Liabilities, Gross Amount Recognized			9,554
Derivative Liabilities, Amount Offset			0
Derivative Liabilities, Net Amount		7,146	9,554
Derivative Liabilities, Financial Instruments	[1]		(5,855)
Derivative Liabilities, Cash Collateral	[2]		(1,474)
Derivative Liabilities, Net amount Total			2,225
Derivative Financial Instruments, Liabilities
Derivative instruments:
Derivative Liabilities, Gross Amount Recognized		3,701,984	3,720,023
Derivative Liabilities, Amount Offset		0	(61,367)
Derivative Liabilities, Net Amount		3,701,984	3,658,656
Derivative Liabilities, Financial Instruments	[1]	(3,694,838)	(3,654,957)
Derivative Liabilities, Cash Collateral	[2]	(5,764)	(1,474)
Derivative Liabilities, Net amount Total		1,382	2,225
Derivative Financial Instruments, Assets
Derivative instruments:
Derivative Asset, Gross Amount Recognized		4,177	147,405
Derivative Asset, Amount Offset		0	(61,367)
Derivative Asset, Net Amount		4,177	86,038
Derivative Asset, Financial Instruments	[1]	0	(5,855)
Derivative Asset, Cash Collateral	[2]	(4,168)	(61,366)
Derivative Asset, Net amount Total		9	18,817
U.S. Treasury Note Futures
Derivative instruments:
Derivative Asset, Gross Amount Recognized		820
Derivative Asset, Amount Offset		0
Derivative Asset, Net Amount		820
Derivative Asset, Financial Instruments	[1]	0
Derivative Asset, Cash Collateral	[2]	(820)
Derivative Asset, Net amount Total		0
U.S. Treasury Note Futures | Option
Derivative instruments:
Derivative Asset, Gross Amount Recognized		1	4,289
Derivative Asset, Amount Offset		0	0
Derivative Asset, Net Amount		1	4,289
Derivative Asset, Financial Instruments	[1]	0	(3,906)
Derivative Asset, Cash Collateral	[2]	0	0
Derivative Asset, Net amount Total		1	383
Derivative instruments:
Derivative Liabilities, Gross Amount Recognized			3,906
Derivative Liabilities, Amount Offset			0
Derivative Liabilities, Net Amount			3,906
Derivative Liabilities, Financial Instruments	[1]		(3,906)
Derivative Liabilities, Cash Collateral	[2]		0
Derivative Liabilities, Net amount Total			0
Repurchase Agreements
Derivative instruments:
Derivative Liabilities, Gross Amount Recognized		3,694,838	3,649,102
Derivative Liabilities, Amount Offset		0	0
Derivative Liabilities, Net Amount		3,694,838	3,649,102
Derivative Liabilities, Financial Instruments	[1]	(3,694,838)	(3,649,102)
Derivative Liabilities, Cash Collateral	[2]	0	0
Derivative Liabilities, Net amount Total		0	0
Deposits, net
Derivative instruments:
Derivative Asset, Gross Amount Recognized			72,516
Derivative Asset, Amount Offset			(61,367)
Derivative Asset, Net Amount			11,149
Derivative Asset, Financial Instruments	[1]		0
Derivative Asset, Cash Collateral	[2]		0
Derivative Asset, Net amount Total			11,149
Derivative instruments:
Derivative Liabilities, Gross Amount Recognized			61,367
Derivative Liabilities, Amount Offset			(61,367)
Derivative Liabilities, Net Amount			0
Derivative Liabilities, Financial Instruments	[1]		0
Derivative Liabilities, Cash Collateral	[2]		0
Derivative Liabilities, Net amount Total			0
Agency MBS | Option
Derivative instruments:
Derivative Asset, Gross Amount Recognized		8
Derivative Asset, Amount Offset		0
Derivative Asset, Net Amount		8
Derivative Asset, Financial Instruments	[1]	0
Derivative Asset, Cash Collateral	[2]	0
Derivative Asset, Net amount Total		8
10-year Interest Rate Swap Futures
Derivative instruments:
Derivative Asset, Gross Amount Recognized		3,348	63,315
Derivative Asset, Amount Offset		0	0
Derivative Asset, Net Amount		3,348	63,315
Derivative Asset, Financial Instruments	[1]	0	(1,949)
Derivative Asset, Cash Collateral	[2]	(3,348)	(61,366)
Derivative Asset, Net amount Total		0	0
Derivative instruments:
Derivative Liabilities, Gross Amount Recognized			1,949
Derivative Liabilities, Amount Offset			0
Derivative Liabilities, Net Amount			1,949
Derivative Liabilities, Financial Instruments	[1]		(1,949)
Derivative Liabilities, Cash Collateral	[2]		0
Derivative Liabilities, Net amount Total			0
Unsettled MBS Trades and TBA Commitments, Net
Derivative instruments:
Derivative Liabilities, Gross Amount Recognized	[3]	7,146
Derivative Liabilities, Amount Offset	[3]	0
Derivative Liabilities, Net Amount	[3]	7,146
Derivative Liabilities, Financial Instruments	[1],[3]	0
Derivative Liabilities, Cash Collateral	[2],[3]	(5,764)
Derivative Liabilities, Net amount Total	[3]	1,382
TBA Commitments
Derivative instruments:
Derivative Asset, Gross Amount Recognized			7,285
Derivative Asset, Amount Offset			0
Derivative Asset, Net Amount		0	7,285
Derivative Asset, Financial Instruments	[1]		0
Derivative Asset, Cash Collateral	[2]		0
Derivative Asset, Net amount Total			7,285
Derivative instruments:
Derivative Liabilities, Gross Amount Recognized			3,699
Derivative Liabilities, Amount Offset			0
Derivative Liabilities, Net Amount		$ 7,146	3,699
Derivative Liabilities, Financial Instruments	[1]		0
Derivative Liabilities, Cash Collateral	[2]		(1,474)
Derivative Liabilities, Net amount Total			$ 2,225

[1] Does not include the fair value amount of financial instrument collateral pledged in respect of repurchase agreements that exceeds the associated liability presented in the consolidated balance sheets.

[2] Does not include the amount of cash collateral pledged in respect of derivative instruments that exceeds the associated derivative liability presented in the consolidated balance sheets.

[3] The “Gross Amount Recognized” and “Net Amount Presented in the Consolidated Balances Sheets” excludes the fair value of unsettled agency MBS purchases and sales recognized on their respective trade dates.

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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value Inputs Assets Quantitative Information [Line Items]
Long-term unsecured debt, carrying value	$ 73,824	$ 73,656
Long-term unsecured debt, Fair Value	71,152	66,489
Private Equity Funds
Fair Value Inputs Assets Quantitative Information [Line Items]
Investments in equity securities and investment funds, at carrying amount	1,701	1,918
Investments in equity securities and investment funds, fair value of other assets	444	533
Investments in equity securities and investment funds, at cost	1,257	1,385
Investments in equity securities and investment funds, fair value	$ 6,205	$ 6,034

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Fair Value Measurements - Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
MBS
Derivative assets, at fair value	$ 4,177	$ 74,889
Derivative Liabilities	(7,146)	(9,554)
Agency MBS
MBS
Fair Value of MBS	3,994,515	3,911,375
Private-Label MBS
MBS
Fair Value of MBS	54	1,266
Fair Value, Measurements, Recurring
MBS
Fair Value of MBS	3,994,569	3,912,641
Derivative assets, at fair value	4,177	74,889
Derivative Liabilities	(7,146)	(9,554)
Other assets	444	533
Total	3,992,044	3,978,509
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
MBS
Fair Value of MBS	0	0
Derivative assets, at fair value	821	4,289
Derivative Liabilities	0	(3,906)
Other assets	0	0
Total	821	383
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
MBS
Fair Value of MBS	3,994,515	3,911,375
Derivative assets, at fair value	3,356	70,600
Derivative Liabilities	(7,146)	(5,648)
Other assets	0	0
Total	3,990,725	3,976,327
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
MBS
Fair Value of MBS	54	1,266
Derivative assets, at fair value	0	0
Derivative Liabilities	0	0
Other assets	444	533
Total	498	1,799
Fair Value, Measurements, Recurring | Agency MBS
MBS
Trading securities	3,994,515	3,911,375
Fair Value, Measurements, Recurring | Agency MBS | Fair Value, Inputs, Level 1
MBS
Trading securities	0	0
Fair Value, Measurements, Recurring | Agency MBS | Fair Value, Inputs, Level 2
MBS
Trading securities	3,994,515	3,911,375
Fair Value, Measurements, Recurring | Agency MBS | Fair Value, Inputs, Level 3
MBS
Trading securities	0	0
Fair Value, Measurements, Recurring | Private-Label MBS
MBS
Trading securities	54	1,266
Fair Value, Measurements, Recurring | Private-Label MBS | Fair Value, Inputs, Level 1
MBS
Trading securities	0	0
Fair Value, Measurements, Recurring | Private-Label MBS | Fair Value, Inputs, Level 2
MBS
Trading securities	0	0
Fair Value, Measurements, Recurring | Private-Label MBS | Fair Value, Inputs, Level 3
MBS
Trading securities	$ 54	$ 1,266

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Fair Value Measurements - Significant Unobservable Inputs Used to Measure Fair value on Private-Label Mortgage-Backed Securities (Details) - Pledged with private-label MBS	12 Months Ended
	Dec. 31, 2016
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	6.50%	[1]
Default rate	2.25%	[1]
Loss severity rate	45.00%	[1]
Total prepayment rate (including defaults)	10.25%	[1]
Maximum
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	6.50%
Default rate	2.25%
Loss severity rate	45.00%
Total prepayment rate (including defaults)	10.25%
Minimum
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	6.50%
Default rate	2.25%
Loss severity rate	45.00%
Total prepayment rate (including defaults)	10.25%

[1] Based on face value.

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Fair Value Measurements - Change in Fair Value of Level 3 Investments that are Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Beginning balance	$ 618	$ 89,186	$ 1,799	$ 130,553
Total net gains (losses) Included in investment (loss) gain, net	(116)	2,994	(55)	537
Total net gains (losses) Included in other comprehensive income		(3,325)		(11,739)
Purchases				5,357
Sales		(67,761)	(1,268)	(106,052)
Payments, net	(6)	(826)	(60)	(4,170)
Accretion of discount	2	1,655	82	7,437
Ending balance	498	21,923	498	21,923
Net unrealized gains (losses) included in earnings for the period for Level 3 assets still held at the reporting date	$ (116)	$ (64)	$ (113)	$ (280)

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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2016
Income Tax Disclosure [Line Items]
Operating Loss Carryforwards	$ 69,720	$ 69,720
Operating Loss Carryforwards Expiration Period		2027
Operating loss carryforwards expiration in year one	136,505	$ 136,505
Operating loss carryforwards expiration in year two	102,927	102,927
Operating loss carryforwards expiration in year three	70,319	70,319
AMT credit carry-forwards	8,952	8,952	$ 8,427
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	(8,417)	11,541
Capital Loss Carryforward [Member]
Income Tax Disclosure [Line Items]
Tax Credit Carryforward, Amount	$ 309,751	$ 309,751

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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Ordinary deferred tax assets:
NOL carry-forward	$ 27,121		$ 37,238
AMT credit carry-forward	8,952		8,427
Deferred net loss on designated derivatives	6,717		1,386
Stock-based compensation	2,563		2,426
Other, net	137		208
Total ordinary deferred tax assets	45,490		49,685
Ordinary deferred tax liabilities:
Net unrealized gain on designated derivatives	(22,037)		(25,145)
Ordinary deferred tax assets, net	23,453		24,540
Capital deferred tax assets:
NCL carry-forward	120,493		120,939
Net unrealized loss on investments	31,951		44,253
Valuation allowance	(152,444)		(140,903)
Total capital deferred tax assets, net			24,289
Total deferred tax assets, net	$ 23,453	$ 40,546	$ 48,829	$ 72,927

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Earnings (Loss) Per Share - Computations of Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Basic weighted-average common shares outstanding	26,377	23,038	24,793	23,011
Performance share units and unvested restricted stock	479	311	350	143
Diluted weighted-average common shares outstanding	26,856	23,349	25,143	23,154
Net income attributable to common stock	$ 22,785	$ 18,813	$ 10,076	$ 89
Basic earnings per common share	$ 0.86	$ 0.82	$ 0.41
Diluted earnings per common share	$ 0.85	$ 0.81	$ 0.40

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Stockholders' Equity - Additional Information (Details) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended	12 Months Ended
		May 31, 2017 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) $ / shares shares	Mar. 31, 2017 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) $ / shares shares	Dec. 31, 2016 $ / shares shares	May 16, 2017 shares	Feb. 22, 2017 shares	May 24, 2013 shares
Share based Compensation Arrangement by Share based Payment Award [Line Items]
Preferred stock, shares authorized (in shares)			25,000,000		25,000,000	25,000,000
Preferred stock, par value (in dollars per share) | $ / shares			$ 0.01		$ 0.01	$ 0.01
Prior Equity Distribution Agreements
Share based Compensation Arrangement by Share based Payment Award [Line Items]
Agreement termination date					Feb. 23, 2017
Common Class A
Share based Compensation Arrangement by Share based Payment Award [Line Items]
Common stock, shares authorized (in shares)			450,000,000		450,000,000	450,000,000
Common stock, par value (in dollars per share) | $ / shares			$ 0.01		$ 0.01	$ 0.01
Common Stock Voting Rights Per Share Owned			1		1
Stock Repurchase Program, Number of Shares Authorized to be Repurchased			2,000,000		2,000,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased			1,951,305		1,951,305
Common Class A | Common Stock
Share based Compensation Arrangement by Share based Payment Award [Line Items]
Conversion of Class B common stock to Class A common stock (in shares)					20,256	81,960
Issuance of stock (in shares)					4,369,637	595,342
Common Class A | Common Stock | Maximum
Share based Compensation Arrangement by Share based Payment Award [Line Items]
Number of Shares Offer and Sell								6,000,000	1,750,000
Common Class A | Common Stock | Prior Equity Distribution Agreements
Share based Compensation Arrangement by Share based Payment Award [Line Items]
Issuance of stock (in shares)				800
Weighted Average Public Offering Price Per Share | $ / shares				$ 15.16
Net Proceeds Underwriting Discounts and Commissions and Expenses | $				$ 12
Common Class A | Common Stock | New Equity Distribution Agreements
Share based Compensation Arrangement by Share based Payment Award [Line Items]
Issuance of stock (in shares)			2,037,348		4,368,837
Number of Shares Offer and Sell			1,631,163		1,631,163
Net Proceeds Underwriting Discounts and Commissions and Expenses | $	[1]		$ 26,567		$ 59,901
Common Class B
Share based Compensation Arrangement by Share based Payment Award [Line Items]
Common stock, shares authorized (in shares)			100,000,000		100,000,000	100,000,000
Common stock, par value (in dollars per share) | $ / shares			$ 0.01		$ 0.01	$ 0.01
Common Stock Voting Rights Per Share Owned			3		3
Common Class B | Common Stock
Share based Compensation Arrangement by Share based Payment Award [Line Items]
Conversion of Class B common stock to Class A common stock (in shares)					(20,256)	(81,960)
7.00 % Series B Cumulative Perpetual Redeemable Preferred Stock
Share based Compensation Arrangement by Share based Payment Award [Line Items]
Preferred stock, shares authorized (in shares)			2,000,000		2,000,000
Preferred stock, par value (in dollars per share) | $ / shares			$ 0.01		$ 0.01
Series A Preferred Stock
Share based Compensation Arrangement by Share based Payment Award [Line Items]
Preferred stock, shares authorized (in shares)			100,000		100,000
Preferred stock shares unissued			100,000		100,000
Undesignated Preferred Stock
Share based Compensation Arrangement by Share based Payment Award [Line Items]
Preferred stock, shares authorized (in shares)			22,900,000		22,900,000
Series B Preferred Stock
Share based Compensation Arrangement by Share based Payment Award [Line Items]
Public Offering Price Per Share | $ / shares		$ 24.00
Net proceeds underwriting discounts and commissions and expenses | $		$ 3,018
Preferred stock, dividend rate percentage					7.00%
Preferred stock voting rights per share owned			0		0
Preferred stock, liquidation preference per share | $ / shares			$ 25.00		$ 25.00
Preferred stock, redeemable price per share | $ / shares			$ 25.00		$ 25.00
Preferred stock, redemption date					May 12, 2022
Preferred stock, dividend payment terms					Dividends are payable quarterly in arrears on the 30th day of each December, March, June and September.
Series B Preferred Stock | Public Offering
Share based Compensation Arrangement by Share based Payment Award [Line Items]
Issuance of stock (in shares)		135,000
Series B Preferred Stock | Preferred Stock
Share based Compensation Arrangement by Share based Payment Award [Line Items]
Issuance of stock (in shares)					294,993
Series B Preferred Stock | Preferred Stock | Maximum
Share based Compensation Arrangement by Share based Payment Award [Line Items]
Number of Shares Offer and Sell							1,865,000
Series B Preferred Stock | Preferred Stock | Series B Preferred Equity Distribution Agreement
Share based Compensation Arrangement by Share based Payment Award [Line Items]
Issuance of stock (in shares)			138,683		159,993
Net Proceeds Underwriting Discounts and Commissions and Expenses | $	[1]		$ 3,404		$ 3,886
Number of Shares Offer and Sell			1,705,007		1,705,007

[1] Net of selling commissions and expenses.

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Stockholders' Equity - Dividends Declared and Paid (Details) - $ / shares	3 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016
Equity [Abstract]
Dividend Amount (in dollars per share)	$ 0.550	$ 0.550	$ 0.625	$ 0.625	$ 0.625	$ 0.625	$ 0.625
Declaration Date	Sep. 14, 2017	Jun. 16, 2017	Mar. 14, 2017	Dec. 16, 2016	Sep. 15, 2016	Jun. 17, 2016	Mar. 15, 2016
Record Date	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 30, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016
Pay Date	Oct. 31, 2017	Jul. 31, 2017	Apr. 28, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 29, 2016	Apr. 29, 2016

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Stockholders' Equity - Issuances of Stock under Equity Distribution Agreements (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	9 Months Ended	12 Months Ended
		Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2016
Common Class A | Common Stock
Class Of Stock [Line Items]
Shares issued			4,369,637	595,342
Common Class A | Common Stock | New Equity Distribution Agreements
Class Of Stock [Line Items]
Shares issued		2,037,348	4,368,837
Weighted average public offering price		$ 13.21	$ 13.90
Net proceeds	[1]	$ 26,567	$ 59,901
Series B Preferred Stock | Preferred Stock
Class Of Stock [Line Items]
Shares issued			294,993
Series B Preferred Stock | Preferred Stock | Series B Preferred Equity Distribution Agreement
Class Of Stock [Line Items]
Shares issued		138,683	159,993
Weighted average public offering price		$ 25.03	$ 24.95
Net proceeds	[1]	$ 3,404	$ 3,886

[1] Net of selling commissions and expenses.

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Revisions to Previously Reported Financial Statements - Schedule of Affected Line Items within Previously Reported Consolidated Financial Statements (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Consolidated Balance Sheets:
Deferred tax assets, net	$ 23,453	$ 40,546	$ 48,829	$ 72,927
Total assets	4,215,599	4,695,889	4,116,951	4,178,336
Accumulated deficit	(1,587,075)	(1,561,552)	(1,551,707)	(1,451,258)
Total stockholders' equity	392,572	349,878	358,813	459,428
Total liabilities and stockholders' equity	$ 4,215,599	4,695,889	4,116,951	4,178,336
As Previously Reported
Consolidated Balance Sheets:
Deferred tax assets, net		65,149	73,432	97,530
Total assets		4,720,492	4,141,554	4,202,939
Accumulated deficit		(1,536,949)	(1,527,104)	(1,426,655)
Total stockholders' equity		374,481	383,416	484,031
Total liabilities and stockholders' equity		4,720,492	4,141,554	4,202,939
Adjustment
Consolidated Balance Sheets:
Deferred tax assets, net		(24,603)	(24,603)	(24,603)
Total assets		(24,603)	(24,603)	(24,603)
Accumulated deficit		(24,603)	(24,603)	(24,603)
Total stockholders' equity		(24,603)	(24,603)	(24,603)
Total liabilities and stockholders' equity		$ (24,603)	$ (24,603)	$ (24,603)