CYS Investments 10-Q 27 Jul 17 2017 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 27, 2017
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2,017
Entity Registrant Name	CYS Investments, Inc.
Entity Central Index Key	1,396,446
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		151,751,482

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets:
Cash and cash equivalents	$ 1,264	$ 1,260	[1]
Agency mortgage-backed securities (including pledged assets of $9,834,904 and $10,233,165, respectively)	11,705,696	12,599,045	[1]
U.S. Treasury securities (including pledged assets of $24,841 and $44,469, respectively)	24,841	49,686	[1]
Receivable for securities sold and principal repayments	689	409,849	[1]
Receivable for cash pledged as collateral	0	600	[1]
Interest receivable	32,340	31,825	[1]
Derivative assets, at fair value	92,520	142,556	[1]
Other investments	8,028	8,028	[1]
Other assets	4,038	2,419	[1]
Total assets	11,869,416	13,245,268	[1]
Liabilities:
Repurchase agreements	9,370,845	9,691,544
Payable for securities purchased	817,597	1,881,963	[1]
Payable for cash received as collateral	64,402	91,503	[1]
Accrued interest payable	28,810	27,908	[1]
Accrued expenses and other liabilities	3,045	6,170	[1]
Dividends payable	42,342	4,410	[1]
Derivative liabilities, at fair value	6,725	6,051	[1]
Total liabilities	10,333,766	11,709,549	[1]
Stockholders' equity:
7.75% Series A Cumulative Redeemable Preferred Stock, (3,000 shares issued and outstanding, respectively, $75,000 in aggregate liquidation preference)	72,369	72,369	[1]
7.50% Series B Cumulative Redeemable Preferred Stock, (8,000 shares issued and outstanding, respectively, $200,000 in aggregate liquidation preference)	193,531	193,531	[1]
Common Stock, $0.01 par value, 500,000 shares authorized (151,731 and 151,435 shares issued and outstanding, respectively)	1,517	1,514	[1]
Additional paid in capital	1,946,856	1,944,908	[1]
Retained earnings (accumulated deficit)	(678,623)	(676,603)	[1]
Total stockholders' equity	1,535,650	1,535,719	[1]
Total liabilities and stockholders' equity	$ 11,869,416	$ 13,245,268	[1]
[1]	Derived from audited consolidated financial statements.

Condolidated Statements Of Asse

Condolidated Statements Of Assets And Liabilities (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Series Cumulative Redeemable Preferred Stock, par value	$ 0.01	$ 0.01
Preferred Stock, shares authorized	50,000,000	50,000,000
Series A Cumulative Redeemable Preferred Stock, shares issued	3,000,000	3,000,000
Series A Cumulative Redeemable Preferred Stock, shares outstanding	3,000,000	3,000,000
Series A Cumulative Redeemable Preferred Stock, aggregate liquidation value	$ 75,000	$ 75,000
Series A Cumulative Redeemable Preferred Stock, liquidation preference per share	$ 25	$ 25
Series B Cumulative Redeemable Preferred Stock, shares issued	8,000,000	8,000,000
Series B Cumulative Redeemable Preferred Stock, shares outstanding	8,000,000	8,000,000
Series B Cumulative Redeemable Preferred Stock, aggregate liquidation value	$ 200,000	$ 200,000
Series B Cumulative Redeemable Preferred Stock, liquidation preference per share	$ 25	$ 25
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	151,731,146	151,434,917
Common stock, shares outstanding	151,731,146	151,434,917
Total Agency RMBS [Member]
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Investments in securities, pledged assets	$ 9,834,904	$ 10,233,165

Condensed Statements Of Operati

Condensed Statements Of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest income:
Agency RMBS	$ 77,027	$ 74,176	$ 150,254	$ 155,499
Other	61	681	147	809
Total interest income	77,088	74,857	150,401	156,308
Interest expense:
Repurchase agreements	26,182	16,910	47,403	32,797
FHLBC Advances	0	1,777	0	3,835
Total interest expense	26,182	18,687	47,403	36,632
Net interest income	50,906	56,170	102,998	119,676
Other income (loss):
Net realized gain (loss) on investments	(19,831)	36,359	(85,875)	37,561
Net unrealized gain (loss) on investments	51,299	28,915	114,777	191,201
Net unrealized gain (loss) on FHLBC Advances	0	(448)	0	(1,299)
Other income	39	387	86	850
Net realized and unrealized gain (loss) on investments, FHLBC Advances and other income	31,507	65,213	28,988	228,313
Swap and cap interest expense	(8,434)	(14,779)	(16,761)	(33,177)
Net realized and unrealized gain (loss) on derivative instruments	(18,324)	(44,535)	(19,336)	(185,059)
Net gain (loss) on derivative instruments	(26,758)	(59,314)	(36,097)	(218,236)
Total other income (loss)	4,749	5,899	(7,109)	10,077
Expenses:
Compensation and benefits	3,004	3,565	6,780	7,430
General, administrative and other	2,426	2,294	4,864	4,782
Total expenses	5,430	5,859	11,644	12,212
Net income (loss)	50,225	56,210	84,245	117,541
Less dividends on preferred shares	(5,203)	(5,203)	(10,406)	(10,406)
Net income (loss) available to common stockholders	$ 45,022	$ 51,007	$ 73,839	$ 107,135
Net income (loss) per common share basic & diluted	$ 0.30	$ 0.34	$ 0.49	$ 0.71
Dividends declared per common share	$ 0.25	$ 0.25	$ 0.50	$ 0.51

Consolidated Statement Of Chang

Consolidated Statement Of Changes In Stockholders Equity - USD ($) $ in Thousands	Total		Common Stock Par Value	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Series A Preferred Stock	Series B Preferred Stock
Balance at Dec. 31, 2015	$ 1,694,614		$ 1,517	$ 1,946,419	$ (519,222)	$ 72,369	$ 193,531
Net income (loss)	117,541		0	0	117,541	0	0
Issuance of common stock	0		4	(4)	0	0	0
Amortization of share-based compensation	2,023		0	2,023	0	0	0
Repurchase of common stock	(5,515)		(7)	(5,508)	0	0	0
Preferred dividends	(10,406)		0	0	(10,406)	0	0
Common dividends	(77,248)		0	0	(77,248)	0	0
Balance at Jun. 30, 2016	1,721,009		1,514	1,942,930	(489,335)	72,369	193,531
Balance at Dec. 31, 2016	1,535,719	[1]	1,514	1,944,908	(676,603)	72,369	193,531
Net income (loss)	84,245		0	0		0	0
Issuance of common stock	14		3	11	0	0	0
Amortization of share-based compensation	2,284		0	2,284	0	0	0
Repurchase of common stock	(347)		0	(347)	0	0	0
Preferred dividends	(10,406)		0	0		0	0
Common dividends	(75,859)		0	0	(75,859)	0	0
Balance at Jun. 30, 2017	$ 1,535,650		$ 1,517	$ 1,946,856	$ (678,623)	$ 72,369	$ 193,531
[1]	Derived from audited consolidated financial statements.

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended			12 Months Ended		20 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2014	Jul. 20, 2014	Dec. 31, 2016	[1]
Cash flows from operating activities:
Net income (loss)	$ (50,225)	$ (56,210)	$ (84,245)		$ (117,541)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Amortization of share-based compensation			2,284		2,023
Amortization of premiums and discounts on investment securities			27,104		38,457
Amortization of premiums on interest rate cap contracts			8,750		8,750
Net realized (gain) loss on investments			85,875		(37,561)
Net unrealized (gain) loss on investments			(114,777)		(191,201)
Net unrealized (gain) loss on derivative instruments			41,960		148,883
Net unrealized (gain) loss on FHLBC Advances	0	448	0		1,299
Change in assets and liabilities:
Interest receivable			(515)		2,103
Other assets			(1,619)		(574)
Accrued interest payable			902		(12,281)
Accrued expenses and other liabilities			(3,125)		774
Net cash provided by (used in) operating activities			131,084		78,213
Cash flows from investing activities:
Purchase of available-for-sale investment securities			(4,494,384)		(7,253,953)
Proceeds from sale of available-for-sale investment securities			4,778,107		6,842,804
Proceeds from sale of other investments			0		19,000
Proceeds from paydowns of available-for-sale investment securities			636,269		865,015
Change in assets and liabilities:
Receivable for securities sold and principal repayments			409,160		1,083,337
Receivable for cash pledged as collateral			600		(75,558)
Payable for securities purchased			(1,064,366)		(823,355)
Payable for cash received as collateral			(27,101)		(13,708)
Net cash provided by (used in) investing activities			238,285		643,582
Cash flows from financing activities:
Proceeds from repurchase agreements			70,517,981		49,667,326
Repayments of repurchase agreements			(70,838,680)		(48,805,601)
Proceeds from FHLBC Advances			0		2,175,000
Repayments of FHLBC Advances			0		(3,700,000)
Proceeds from Issuance of Common Stock			14		0
Net payments from repurchase of common stock			(347)		(5,515)	$ (87,700)	$ (1,500)	$ (115,700)
Dividends paid			(48,333)		(49,805)
Net cash provided by (used in) financing activities			(369,365)		(718,595)
Net increase (decrease) in cash and cash equivalents			4		3,200
Cash and cash equivalents - Beginning of period			1,260	[1]	9,982
Cash and cash equivalents - End of period	1,264	13,182	1,264		13,182	$ 9,982
Supplemental disclosures of cash flow information:
Interest paid (excluding interest paid on interest rate swaps)			45,924		37,549
Net interest paid on interest rate swaps			8,587		35,789
Income taxes paid			1,499		0
Supplemental disclosures of non-cash flow information:
Dividends declared, not paid	$ 42,342	$ 42,259	$ 42,342		$ 42,259				$ 4,410
[1]	Derived from audited consolidated financial statements.

Orginazation

Orginazation	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	ORGANIZATION CYS Investments, Inc. (the "Company", "we", "us" or "our") was formed as a Maryland corporation on January 3, 2006, and commenced operations on February 10, 2006. The Company has elected to be taxed and intends to continue to qualify as a real estate investment trust ("REIT") and is required to comply with the provisions of the Internal Revenue Code of 1986, as amended (the "Code"), with respect thereto. The Company primarily invests in residential mortgage-backed securities that are issued and the principal and interest of which are guaranteed by a federally chartered corporation ("Agency RMBS"), such as the Federal National Mortgage Association ("Fannie Mae") or the Federal Home Loan Mortgage Corporation ("Freddie Mac"), or an agency of the U.S. government such as the Government National Mortgage Association ("Ginnie Mae"), and debt securities issued by the United States Department of Treasury ("U.S. Treasuries"). The Company's investment guidelines provide that the Company may also purchase collateralized mortgage obligations issued by a government agency or government-sponsored entity that are collateralized by Agency RMBS ("CMOs"), or securities issued by a government sponsored entity that are not backed by collateral but, in the case of government agencies, are backed by the full faith and credit of the U.S. government, and, in the case of government sponsored entities, are backed by the integrity and creditworthiness of the issuer ("U.S. Agency Debentures"). The Company’s common stock, Series A Cumulative Redeemable Preferred Stock, $25.00 liquidation preference (the "Series A Preferred Stock"), and Series B Cumulative Redeemable Preferred Stock, $25.00 liquidation preference (the "Series B Preferred Stock"), trade on the New York Stock Exchange under the symbols "CYS," "CYS PrA" and "CYS PrB," respectively. In March 2015, our wholly-owned captive insurance subsidiary, CYS Insurance Services, LLC ("CYS Insurance"), was granted membership in the Federal Home Loan Bank ("FHLB") system, specifically in the FHLB of Cincinnati ("FHLBC"). Membership in the FHLBC obligated CYS Insurance to purchase FHLBC membership stock and activity stock, the latter being a percentage of the advances it obtained from the FHLBC. CYS Insurance sought both short-term advances ("Short-term FHLBC Advances") and long-term advances ("Long-term FHLBC Advances"), and collectively with Short-term FHLBC Advances ("FHLBC Advances") from the FHLBC. On January 12, 2016, the Federal Housing Finance Agency ("FHFA") issued a final rule (the "Final Rule") amending its regulations governing FHLBC Membership criteria for captive insurance companies. Under this Final Rule, which became effective on February 19, 2016, CYS Insurance's membership in the FHLBC was required to be terminated within one year of the effective date, it was not permitted to secure any new advances, and all FHLBC Advances were required to be repaid no later than February 19, 2017. The Company repaid all outstanding FHLBC Advances prior to September 30, 2016, and CYS Insurance's membership in the FHLBC was terminated on February 19, 2017.

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Significant Accounting Policies	SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The accompanying unaudited consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("GAAP") and the instructions to the Securities and Exchange Commission ("SEC") Form 10-Q and Article 10, Rule 10-01 of Regulation S-X. Accordingly, the financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. The unaudited consolidated financial statements should be read in conjunction with the Company’s audited financial statements as of and for the year ended December 31, 2016, included in the 2016 Annual Report. The results for interim periods are not necessarily indicative of the results to be expected for the entire fiscal year. The unaudited consolidated financial statements include the accounts of the Company and all of its subsidiaries. All intercompany balances and transactions have been eliminated. The unaudited consolidated financial statements of the Company have been prepared on the accrual basis of accounting in accordance with GAAP. The preparation of financial statements in conformity with GAAP requires management to make a number of estimates and assumptions that affect the amounts reported in the unaudited consolidated financial statements and accompanying footnotes. Actual results could differ from these estimates and the differences may be material. Reclassification Prior to January 1, 2016, FHLBC Advances were presented and disclosed separately on the consolidated balance sheet and interest expense on all FHLBC Advances was reported in the aggregate with interest expense on repurchase agreements. Effective January 1, 2016, FHLBC Advances are presented on the balance sheet and disclosed in the aggregate, while interest expense on FHLBC Advances is reported separately from interest expense on repurchase agreements. Prior periods have been reclassified to conform to the current period presentation. Cash and Cash Equivalents Cash and cash equivalents represent cash held in banks, cash on hand, and liquid investments with original maturities of three months or less. We may have bank balances in excess of federally insured amounts; however, we deposit our cash and cash equivalents with high credit-quality institutions to minimize credit risk exposure. We have not experienced, and do not expect, any losses on our cash or cash equivalents. Investments in Securities The Company's investment securities are accounted for in accordance with the Financial Accounting Standards Board's ("FASB") Accounting Standards Codification ("ASC") 320 -Investments-Debt and Equity Securities . These investments meet the requirements to be classified as available-for-sale under ASC 320. Therefore, our investment securities are recorded at fair market value on the consolidated balance sheets. The Company has chosen to make a fair value election pursuant to ASC 825 -Financial Instruments for its securities. Electing the fair value option requires the Company to record changes in the fair value of investments in the Consolidated Statement of Operations as a component of net unrealized gain (loss) on investments, which in management’s view more appropriately reflects the results of operations for a particular reporting period as all securities activities will be recorded in a similar manner. The Company records its security purchase and sale transactions, including forward settling transactions, on a trade date basis. Realized gains and losses on securities transactions are recorded on an identified cost basis. Agency RMBS The Company's investments in Agency RMBS consist of pass-through certificates backed by fixed-rate, monthly-reset adjustable-rate loans ("ARMs") and Hybrid ARMs, the principal and interest of which are guaranteed by Fannie Mae, Freddie Mac or Ginnie Mae. Hybrid ARMs have interest rates that have an initial fixed period (typically three, five, seven or 10 years) and thereafter reset at regular intervals in a manner similar to ARMs. Forward Settling Transactions The Company engages in forward settling transactions to purchase or sell certain securities. Agency RMBS may include forward contracts for Agency RMBS purchases or sales of specified pools on a to-be-announced basis ("TBA Securities") that meet the regular-way scope exception in ASC 815 -Derivatives and Hedging ("ASC 815") , and are recorded on a trade date basis to the extent it is probable that we will take or make timely physical delivery of the related securities. The Company maintains security positions such that sufficiently liquid assets will be available to make payment on the settlement date for securities purchased. The Agency RMBS purchased at the forward settlement date are typically priced at a discount to securities for settlement in the current month. Securities purchased on a forward settling basis are carried at fair value and begin earning interest on the settlement date. Gains or losses may occur on these transactions due to changes in market conditions or the failure of counterparties to perform under the contract. Investment and Derivative Valuation The Company has a pricing committee responsible for establishing valuation policies and procedures, and reviewing and approving valuations during monthly pricing meetings. The pricing committee is composed of individuals from the finance and investment teams and other members of senior management. See Note 7, Fair Value Measurements , for additional details related to the fair value of the Company's assets and liabilities. Interest Income We record interest income and expense on an accrual basis. We accrue interest income based on the outstanding principal amount of the settled securities in our portfolio and their contractual terms. We amortize premiums and discounts using the effective interest method as prepayments occur, and this net amortization is either a reduction of or accretive to interest income from Agency RMBS in the accompanying Consolidated Statements of Operations. The Company does not estimate prepayments when calculating the yield to maturity on Agency RMBS. Other Investments CYS Insurance was a member of the FHLBC. As a condition of its membership in the FHLBC, CYS Insurance was required to maintain FHLBC stock, both for membership and for the level of advances from the FHLBC to CYS Insurance. The Company accounted for its investment in FHLBC stock as a cost method investment in "Other investments" in the accompanying consolidated balance sheets in accordance with ASC 325, Investments - Other . The Company periodically evaluated FHLBC stock for impairment in accordance with ASC 320 -Investments-Debt and Equity Securities . Also included in other investments is a net investment in real estate that is recorded at fair value, inclusive of $3.7 million of corresponding mortgage debt, with changes in estimated fair value recognized in the accompanying Consolidated Statements of Operations. Repurchase Agreements and FHLBC Advances Prior to the Final Rule effective as of February 19, 2016, which precluded the Company from securing new FHLBC Advances, we entered into FHLBC Advances, some of which had an initial maturity of more than one year that were collateralized by the Company's Agency RMBS and U.S. Treasuries (collectively, "Debt Securities"). The Company chose to make a fair value election pursuant to ASC 825 -Financial Instruments for FHLBC Advances with initial terms greater than one year and, therefore, this debt was recorded at fair market value in the accompanying consolidated balance sheets. The unpaid principal balance of FHLBC Advances with initial maturities less than one year generally approximated fair value due to the short-term nature of the instruments. We priced FHLBC Advances with an initial maturity greater than one year daily through a pricing service that used a discounted cash flow model to value the debt, and we periodically validated the prices we received through this process. Changes in the fair market value were recorded in current period earnings in the accompanying Consolidated Statements of Operations as a component of net unrealized gain (loss) on FHLBC Advances. Electing the fair value option permitted the Company to record changes in the fair value of FHLBC Advances along with that of our investments in the Consolidated Statements of Operations which, in management’s view, more appropriately reflect the results of operations for a particular reporting period as all income producing assets and liabilities are recognized in a consistent manner. Borrowings under repurchase agreements ("repo borrowings") are, and FHLBC Advances were, collateralized by the Company’s Debt Securities. The Company’s repo borrowing counterparties are institutional dealers in fixed income securities and large financial institutions, and CYS Insurance's counterparty for FHLBC Advances was the FHLBC. Collateral pledged on repo borrowings is valued daily, and collateral that was pledged on FHLBC Advances was valued periodically, and our counterparties may require posting of additional collateral when the fair value of pledged collateral declines. Repo borrowing counterparties have, and the FHLBC had, the right to sell or repledge collateral pledged under repo borrowings and FHLBC Advances. We account for our repo borrowings as short-term indebtedness under ASC 470 -Debt; accordingly, these short-term instruments are reflected in our financial statements at their amortized cost, which approximates fair value due to their short-term nature. Derivative Instruments Included in Derivative Instruments are interest rate swaps and interest rate caps and TBA Derivatives (defined below). The Company uses interest rate swaps and caps (a "swap" or "cap", respectively) to economically hedge a portion of its exposure to market risks, including interest rate and extension risk. The objective of our risk management strategy is to reduce fluctuations in stockholders’ equity over a range of interest rate scenarios. In particular, we attempt to manage the risk of the cost of our variable rate liabilities increasing during a period of rising interest rates. During the term of a swap or cap, the Company makes and/or receives periodic payments and records unrealized gains or losses as a result of marking the swap or cap to fair value. We report the periodic payments and amortization of premiums on cap contracts under swap and cap interest expense in the accompanying Consolidated Statements of Operations . When the Company terminates a swap or cap, we record a realized gain or loss equal to the difference between the proceeds from (or the cost of) closing the transaction and the Company's cost basis in the contract, if any. Swaps involve a risk that interest rates will move contrary to the Company’s expectations, thereby increasing the Company’s payment obligation. The Company's swaps and caps may be subject to a master netting arrangement ("MNA"), pursuant to which the Company may be exposed to credit loss in the event of non-performance by the counterparty to the swap or cap, limited to the fair value of collateral posted in excess of the fair value of the contract in a net liability position and the shortage of the fair value of collateral posted for the contract in a net asset position. As of June 30, 2017 and December 31, 2016, the Company did not anticipate non-performance by any counterparty. Should interest rates move contrary to the Company's expectations, the Company may not achieve the anticipated benefits of the interest rate swap or cap and may realize a loss. While the Company's derivative agreements generally permit netting or setting-off derivative assets and liabilities with the counterparty, the Company reports derivative assets and liabilities on a gross basis in the accompanying consolidated balance sheets. Derivatives are accounted for in accordance with ASC 815 which requires recognition of all derivatives as either assets or liabilities at fair value in the accompanying consolidated balance sheets with changes in fair value recognized in the accompanying Consolidated Statements of Operations in "Net realized and unrealized gain (loss) on derivative instruments". Cash receipts and payments related to derivative instruments are classified in the accompanying Consolidated Statements of Cash Flows in accordance with GAAP in both the operating and investing activities sections. The Company enters into TBA dollar roll transactions whereby the Company is not contractually obligated to accept delivery on the settlement date ("TBA Derivatives"). TBA Derivatives are accounted for as a series of derivative transactions. The fair value of TBA Derivatives is based on similar methods used to value Agency RMBS with gains and losses recorded in Net realized and unrealized gains (losses) on derivative instruments in the accompanying Consolidated Statements of Operations . TBA Derivative transactions involve moving the settlement of a TBA contract out to a later date by entering into an offsetting short position (referred to as a "pair off"), net settling the paired off positions for cash, and simultaneously purchasing a similar TBA contract for a later settlement date. The Company records such pair offs on a gross basis such that there is a sale of the original TBA Derivative and a subsequent purchase of a new TBA Derivative. None of the Company's derivatives have been designated as hedging instruments for accounting purposes. Effective January 1, 2016, the Company recognized all TBAs that do not qualify for the regular-way scope exception under ASC 815 as derivatives. Income Taxes The Company has elected to be treated as a REIT under the Code. The Company will generally not be subject to federal income tax to the extent that it distributes 90% of its taxable income, after application of available tax attributes, within the time limits prescribed by the Code and as long as it satisfies the ongoing REIT requirements including meeting certain asset, income and stock ownership tests. Leases The Company occupies leased office space. The Company’s lease is accounted for in accordance with ASC 840 -Leases , and is classified as an operating lease. Rent expense is amortized on a straight-line basis over the lease term and is included in "General, administrative and other expense" in the accompanying Consolidated Statements of Operations. Stock-based compensation The Company applies the provisions of ASC 718- Compensation-Stock Compensation , with regard to its equity incentive plans. ASC 718 covers a wide range of share-based compensation arrangements including stock options, restricted stock plans, performance-based awards, stock appreciation rights and employee stock purchase plans. ASC 718 requires that compensation costs relating to stock-based payment transactions be recognized in the consolidated financial statements. Compensation costs related to restricted common shares issued are measured at their estimated fair value at the grant date, and are amortized and expensed over the vesting period on a straight-line basis. Earnings Per Share ("EPS") The Company computes basic EPS using the two-class method by dividing net income (loss), after adjusting for the impact of unvested stock awards deemed to be participating securities, by the weighted-average number of common shares outstanding, calculated excluding unvested stock awards. The Company computes diluted EPS by dividing net income (loss), after adjusting for the impact of unvested stock awards deemed to be participating securities, by the weighted-average number of common shares outstanding, calculated excluding unvested stock awards, giving effect to common stock options and warrants, if they are not anti-dilutive. See Note 9, Earnings Per Share for EPS computations. Recent Accounting Pronouncements The following table provides a brief description of recent accounting pronouncements that could potentially impact the Company's unaudited consolidated financial statements: Accounting Standard Description Required Date of Adoption Anticipated Effect on the Financial Statements ASU 2017-09 Compensation - Stock Compensation (Topic 718); Scope of Modification Accounting On May 10, 2017, the FASB issued ASU 2017-09, which amends the scope of modification accounting for share-based payment arrangements. The ASU provides guidance on the types of changes to the terms or conditions of share-based payment awards to which an entity would be required to apply modification accounting under ASC 718, (Compensation - Stock Compensation). Specifically, an entity would not apply modification accounting if the fair value, vesting conditions, and classification of the awards are the same immediately before and after the modification. Effective for annual reporting periods, including interim periods within those annual reporting periods, beginning after December 15, 2017. Early adoption is permitted, including adoption in any interim period. Not expected to have a significant impact on the consolidated financial statements. ASU 2017-05 Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20) Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets On February 22, 2017, the FASB issued ASU 2017-05, which clarifies the scope of the Board’s recently established guidance on nonfinancial asset derecognition (ASC 610-20) as well as the accounting for partial sales of nonfinancial assets. The ASU conforms the derecognition guidance on nonfinancial assets with the model for transactions in the new revenue standard (ASC 606, as amended). The FASB issued the ASU in response to stakeholder feedback indicating that (1) the meaning of the term “in-substance nonfinancial asset” is unclear because the Board’s new revenue standard does not define it and (2) the scope of the guidance on nonfinancial assets is confusing and complex and does not specify how a partial sales transaction should be accounted for or which model entities should apply. January 1, 2018. The effective date of the new guidance aligns with the requirements in the new revenue standard. If the entity decides to early adopt the ASU’s guidance, it must also early adopt ASC 606-Revenue from Contracts with Customers (and vice versa). Not expected to have a significant impact on the consolidated financial statements. Accounting Standard Description Required Date of Adoption Anticipated Effect on the Financial Statements ASU 2017-01 Business Combinations (Topic 805) Clarifying the Definition of a Business On January 5, 2017, the FASB issued ASU 2017-01 to clarify the definition of a business in ASC 805. The FASB issued the ASU in response to stakeholder feedback that the definition of a business in ASC 805 is being applied too broadly. In addition, stakeholders said that analyzing transactions under the current definition is difficult and costly. Concerns about the definition of a business were among the primary issues raised in connection with the Financial Accounting Foundation’s post-implementation review report on FASB Statement No. 141(R), Business Combinations (codified in ASC 805). The amendments in the ASU are intended to make application of the guidance more consistent and cost-efficient. Real estate is less likely to be a "business" which will lead to more capitalization of transaction costs-vs-expensing. January 1, 2018 (early adoption permitted). Not expected to have a significant impact on the consolidated financial statements. ASU 2016-15 Statement of Cash Flows (Topic 230) Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15") (a consensus of the Emerging Issues Task Force) On August 26, 2016, the FASB issued ASU 2016-15, which amends ASC 230, Statement of Cash Flows ("ASC 230), to add or clarify guidance on the classification of certain cash receipts and payments in the statement of cash flows. ASC 230 lacks consistent principles for evaluating the classification of cash payments and receipts in the statement of cash flows. This has led to diversity in practice and, in certain circumstances, financial statement restatements. Consequently, the FASB issued ASU 2016-15 with the intent of reducing diversity in practice with respect to certain types of cash flows. January 1, 2018 (early adoption is permitted). Entities must apply the guidance retrospectively to all periods presented but may apply it prospectively if retrospective application would be impracticable. Not expected to have a significant impact on the consolidated financial statements. ASU 2016-02 Leases (Topic 842) The amendments require lessees to recognize a right-of-use asset and a liability to make lease payments in the balance sheets for most leases. The accounting for lessors is largely unchanged. January 1, 2019 (early adoption permitted). Not expected to have a significant impact on the consolidated financial statements. ASU 2016-01 Financial Instruments - Overall (Subtopic 825-10) Recognition and Measurement of Financial Assets and Financial Liabilities The amendments address certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. January 1, 2018 (early adoption permitted for a provision related to presentation of instrument-specific credit risk of liabilities accounted for under the fair value option). Not expected to have a significant impact on the consolidated financial statements.

Investments in Securities

Investments in Securities	6 Months Ended
	Jun. 30, 2017
Available-for-sale Securities [Abstract]
Investments in Securities and Other Assets	INVESTMENTS IN SECURITIES The available-for-sale portfolio consisted of the following as of June 30, 2017 and December 31, 2016 (in thousands): June 30, 2017 Asset Type Amortized Cost Gross Unrealized Loss Gross Unrealized Gain Fair Value Fannie Mae Certificates Fixed Rate $ 8,986,881 $ (21,649 ) $ 41,581 $ 9,006,813 ARMs 243,346 (1,303 ) 1,413 243,456 Total Fannie Mae 9,230,227 (22,952 ) 42,994 9,250,269 Freddie Mac Certificates Fixed Rate 2,355,189 (11,091 ) 11,281 2,355,379 ARMs 67,314 (147 ) 482 67,649 Total Freddie Mac 2,422,503 (11,238 ) 11,763 2,423,028 Ginnie Mae Certificates Fixed Rate 1,745 (51 ) — 1,694 ARMs 30,304 — 401 30,705 Ginnie Mae Certificates - ARMs 32,049 (51 ) 401 32,399 Total Agency RMBS 11,684,779 (34,241 ) 55,158 11,705,696 U.S. Treasuries 24,984 (143 ) — 24,841 Total $ 11,709,763 $ (34,384 ) $ 55,158 $ 11,730,537 December 31, 2016 Asset Type Amortized Cost Gross Unrealized Loss Gross Unrealized Gain Fair Value Fannie Mae Certificates Fixed Rate $ 9,505,262 $ (81,783 ) $ 36,622 $ 9,460,101 ARMs 301,029 (2,668 ) 1,571 299,932 Total Fannie Mae 9,806,291 (84,451 ) 38,193 9,760,033 Freddie Mac Certificates Fixed Rate 2,799,604 (55,624 ) 7,659 2,751,639 ARMs 50,641 (514 ) 606 50,733 Total Freddie Mac 2,850,245 (56,138 ) 8,265 2,802,372 Ginnie Mae Certificates Fixed Rate 1,856 (54 ) — 1,802 ARMs 34,390 — 448 34,838 Total Ginnie Mae 36,246 (54 ) 448 36,640 Total Agency RMBS 12,692,782 (140,643 ) 46,906 12,599,045 U.S. Treasuries 49,952 (266 ) — 49,686 Total $ 12,742,734 $ (140,909 ) $ 46,906 $ 12,648,731 The following table presents the gross unrealized loss and fair values of our available-for-sale investments by length of time that such securities have been in a continuous unrealized loss position as of June 30, 2017 and December 31, 2016 (in thousands): Unrealized loss positions Less than 12 Months Greater than 12 months Total As of Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss June 30, 2017 $ 4,711,452 $ (34,384 ) $ — $ — $ 4,711,452 $ (34,384 ) December 31, 2016 9,264,265 (140,909 ) — — 9,264,265 (140,909 ) The following table summarizes the Company’s available-for-sale investments as of June 30, 2017 and December 31, 2016 , according to their estimated remaining weighted-average maturity classifications: June 30, 2017 December 31, 2016 Fair Value Amortized Cost Fair Value Amortized Cost Less than one year $ 24,841 $ 24,984 $ — $ — Greater than one year through five years 6,877,266 6,849,276 3,765,037 3,744,614 Greater than five years through ten years 4,828,430 4,835,503 8,864,309 8,978,537 Greater than ten years — — 19,385 19,583 Total $ 11,730,537 $ 11,709,763 $ 12,648,731 $ 12,742,734 The following table summarizes our net realized gain (loss) from the sale of available-for-sale investments for the three months ended June 30, 2017 and 2016 (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Available-for-sale investments, at cost $ 1,265,490 $ 5,408,055 $ 4,863,982 $ 6,805,243 Proceeds from sale of available-for-sale investments 1,245,659 5,444,414 4,778,107 6,842,804 Net realized gain (loss) on sale of available-for-sale investments $ (19,831 ) $ 36,359 (85,875 ) 37,561 Gross gain on sale of available-for-sale investments $ 2,270 $ 36,743 10,873 42,126 Gross (loss) on sale of available-for-sale investments (22,101 ) (384 ) (96,748 ) (4,565 ) Net realized gain (loss) on sale of available-for-sale investments $ (19,831 ) $ 36,359 $ (85,875 ) $ 37,561 The components of the carrying value of available-for-sale securities at June 30, 2017 and December 31, 2016 are presented below. A premium purchase price is generally due to the average coupon interest rates on these investments being higher than prevailing market rates; similarly, a discount purchase price is generally due to the average coupon interest rate on these investments being lower than prevailing market rates. (in thousands) June 30, 2017 December 31, 2016 Principal balance $ 11,341,310 $ 12,285,204 Unamortized premium 368,542 458,709 Unamortized discount (89 ) (1,179 ) Gross unrealized gains 55,158 46,906 Gross unrealized losses (34,384 ) (140,909 ) Fair value $ 11,730,537 $ 12,648,731 As of June 30, 2017 , the weighted-average coupon interest rate on the Company's Agency RMBS and U.S. Treasuries was 3.46% and 0.63% , respectively. As of December 31, 2016 , the weighted-average coupon interest rate on the Company's Agency RMBS and U.S. Treasuries was 3.37% and 0.63% , respectively. Actual maturities of Agency RMBS are generally shorter than their stated contractual maturities (which range up to 30 years), because they are affected by the contractual lives of the underlying mortgages, periodic payments and principal prepayments. Credit Risk The Company believes it has minimal exposure to credit losses on its Debt Securities at June 30, 2017 and December 31, 2016 . Principal and interest payments on Agency RMBS are guaranteed by Freddie Mac and Fannie Mae, while principal and interest payments on Ginnie Mae RMBS and U.S. Treasuries are backed by the full faith and credit of the U.S. government. Since September 2008, both Freddie Mac and Fannie Mae have operated in the conservatorship of the U.S. government. As of June 30, 2017 , S&P maintained its AA+ rating for the U.S. government, while Fitch and Moody's rated the U.S. government AAA and Aaa, respectively. Since Fannie Mae and Freddie Mac are in U.S. government conservatorship, the implied credit ratings of Agency RMBS are similarly rated.

Derivative Instruments

Derivative Instruments	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Fair Value [Text Block]	The Company enters into swaps and caps as part of its efforts to manage its interest rate exposure. The Company had the following activity in interest rate swap and cap transactions during the three and six months ended June 30, 2017 and 2016 (in thousands): June 30, 2017 June 30, 2016 Trade Date Transaction Notional Trade Date Transaction Notional April 2017 Terminated (500,000 ) January 2016 Terminated $ (500,000 ) April 2017 Opened 500,000 May 2016 Terminated (2,200,000 ) May 2017 Terminated (500,000 ) May 2016 Opened 1,700,000 May 2017 Opened 500,000 Net Decrease $ (1,000,000 ) June 2017 Opened 100,000 Net Increase $ 100,000 As of June 30, 2017 and December 31, 2016 , the Company had pledged Debt Securities with a fair value of $58.1 million and $72.5 million , respectively, as collateral on swaps and caps. As of June 30, 2017 and December 31, 2016 , the Company had no cash pledged as collateral on swaps and caps. As of June 30, 2017 , the Company had Agency RMBS and U.S. Treasuries of $9.1 million and cash of $64.4 million pledged to it as collateral for its derivative instruments. As of December 31, 2016, the Company had Agency RMBS and U.S. Treasuries of $33.0 million and cash of $90.8 million pledged to it as collateral for its derivative instruments. The table below summarizes information about our derivative and other hedging instrument assets and liabilities as of June 30, 2017 and December 31, 2016 (in thousands): June 30, 2017 December 31, 2016 Derivative and Other Hedging Instruments - Assets Consolidated Balance Sheets Notional Fair Value Notional Fair Value Interest Rate Swaps Derivative assets, at fair value $ 5,550,000 $ 64,513 $ 6,450,000 $ 80,608 Interest Rate Caps Derivative assets, at fair value 2,500,000 27,731 2,500,000 42,532 TBA Derivatives Derivative assets, at fair value 255,600 276 2,417,000 19,416 Total derivative assets at fair value $ 8,305,600 $ 92,520 $ 11,367,000 $ 142,556 Derivative and Other Hedging Instruments - Liabilities Consolidated Balance Sheets Notional Fair Value Notional Fair Value Interest Rate Swaps Derivative liabilities, at fair value $ 1,000,000 $ (883 ) $ — $ — Interest Rate Caps Derivative liabilities, at fair value — — — — TBA Derivatives Derivative liabilities, at fair value 1,486,850 (5,842 ) 1,870,000 (6,051 ) Total derivative liabilities at fair value $ 2,486,850 $ (6,725 ) $ 1,870,000 $ (6,051 ) The average notional value of the Company's TBA Derivatives during the three and six months ended June 30, 2017 was $1.7 billion and $1.6 billion , respectively. The average notional value of the Company's TBA Derivatives during the three and six months ended June 30, 2016 was $1.1 billion and $1.3 billion , respectively. The average notional value of the Company's swaps and caps during the three and six months ended June 30, 2017 was $9.0 billion . The average notional value of the Company's swaps and caps during the three and six months ended June 30, 2016 was $9.7 billion and $9.9 billion , respectively. The following table presents information about the net realized and unrealized gain (loss) on swap, cap and TBA Derivatives for the three and six months ended June 30, 2017 and 2016 (in thousands): Three Months Ended June 30, Six Months Ended June 30, Derivative Instrument Type Location of Gain (Loss) on Derivative Instruments 2017 2016 2017 2016 Interest rate swaps and caps Swap and cap interest expense $ (8,434 ) $ (14,779 ) $ (16,761 ) $ (33,177 ) Interest rate swaps, caps and TBA Derivatives Net realized and unrealized gain (loss) on derivative instruments (18,324 ) (44,535 ) (19,336 ) (185,059 ) Interest rate swaps, caps and TBA Derivatives Net gain (loss) on derivative instruments $ (26,758 ) $ (59,314 ) $ (36,097 ) $ (218,236 ) The swap and cap notional was $9.1 billion at June 30, 2017 compared to $9.0 billion at December 31, 2016 , and respectively 97% and 92% of our repo borrowings at June 30, 2017 and December 31, 2016 .

Repurchase Agreements and FHLB

Repurchase Agreements and FHLB Advances	6 Months Ended
	Jun. 30, 2017
Banking and Thrift [Abstract]
Repurchase Agreements	REPURCHASE AGREEMENTS AND FHLBC ADVANCES The Company leverages its Debt Securities portfolio primarily through repo borrowings. Each of the Company's repo borrowings bears interest at a rate based on a spread above or below the London Interbank Offered Rate ("LIBOR"). While repo borrowings are the Company's principal source of borrowings, the Company may issue long-term debt ( i.e. , debt with an initial term greater than one year) to diversify credit sources and to manage interest rate and duration risk. Certain information with respect to the Company’s repo borrowings outstanding at the balance sheet dates is summarized in the table below. (in thousands) June 30, 2017 December 31, 2016 Outstanding repurchase agreements $ 9,370,845 $ 9,691,544 Interest accrued thereon $ 17,649 $ 16,170 Weighted-average borrowing rate 1.23 % 0.89 % Weighted-average remaining maturity (in days) 79.9 53.3 Fair value of pledged collateral (1) $ 9,798,063 $ 10,198,641 __________________ (1) Collateral for repo borrowings consists of Agency RMBS and U.S. Treasuries. The following table presents the remaining contractual maturity of repo borrowings by collateral type as of June 30, 2017 and December 31, 2016 (in thousands): Remaining contractual maturity June 30, 2017 Up to 30 days 30-90 days Greater than 90 days Total Agency RMBS $ 3,399,706 $ 3,114,492 $ 2,856,647 $ 9,370,845 Total $ 3,399,706 $ 3,114,492 $ 2,856,647 $ 9,370,845 December 31, 2016 Agency RMBS $ 4,113,286 $ 3,694,937 $ 1,883,321 $ 9,691,544 Total $ 4,113,286 $ 3,694,937 $ 1,883,321 $ 9,691,544 At June 30, 2017 and December 31, 2016 , our amount at risk with any individual counterparty related to our repo borrowings was less than 2.2% and 2.6% of stockholders' equity, respectively. The amount at risk is defined as the excess of the fair value of the securities, including accrued interest, and cash, pledged to secure the repurchase agreement, over the amount of the repurchase agreement liability adjusted for accrued interest. Prior to the issuance of the Final Rule, pursuant to the FHLBC terms and conditions of membership and applicable credit policies, CYS Insurance was able to obtain FHLBC Advances, secured by eligible collateral, including, but not limited to, residential mortgage-backed securities. As a direct result of the Final Rule, all FHLBC Advances were required to be repaid on or before February 19, 2017. The Company repaid all of its remaining FHLBC Advances prior to September 30, 2016.

Pledged Assets

Pledged Assets	6 Months Ended
	Jun. 30, 2017
Transfers and Servicing [Abstract]
Pledged Assets	PLEDGED ASSETS Assets Pledged to Counterparties The following tables summarize our assets pledged as collateral under repo borrowings, and derivative instruments by type, including securities pledged related to securities purchased or sold but not yet settled, as of June 30, 2017 and December 31, 2016 (in thousands): June 30, 2017 Asset Type Repurchase Agreements Derivative Instruments * Forward Settling Trades (TBAs) Total Agency RMBS - fair value $ 9,798,173 $ 34,751 $ 1,980 $ 9,834,904 U.S. Treasuries - fair value 301 26,126 — 26,427 Accrued interest on pledged securities 27,233 91 10 27,334 Cash — — — — Total $ 9,825,707 $ 60,968 $ 1,990 $ 9,888,665 December 31, 2016 Asset Type Repurchase Agreements Derivative Instruments * Forward Settling Trades (TBAs) Total Agency RMBS - fair value $ 10,197,244 $ 33,311 $ 2,610 $ 10,233,165 U.S. Treasuries - fair value 1,398 45,730 — 47,128 Accrued interest on pledged securities 27,730 87 7 27,824 Cash — 600 — 600 Total $ 10,226,372 $ 79,728 $ 2,617 $ 10,308,717 ______________ * Includes amounts related to TBA Derivatives. Assets Pledged from Counterparties If the estimated fair value of our investment securities pledged as collateral increases due to changes in interest rates or other factors, we may require counterparties to return collateral to us, which may be in the form of identical or similar securities, or cash. As of June 30, 2017 and December 31, 2016 , we had assets pledged to us as collateral under our repurchase agreements, derivative agreements and TBAs as summarized in the tables below (in thousands): June 30, 2017 Asset Type Repurchase Agreements Derivative Instruments * Forward Settling Trades (TBAs) Total Agency RMBS - fair value $ — $ — $ — $ — U.S. Treasuries - fair value 411 9,115 — 9,526 Accrued interest on pledged securities 2 38 — 40 Cash — 64,402 — 64,402 Total $ 413 $ 73,555 $ — $ 73,968 December 31, 2016 Asset Type Repurchase Agreements Derivative Instruments * Forward Settling Trades (TBAs) Total Agency RMBS - fair value $ — $ 3,016 $ 1,293 $ 4,309 U.S. Treasuries - fair value — 29,937 — 29,937 Accrued interest on pledged securities — 1,788 4 1,792 Cash — 90,779 724 91,503 Total $ — $ 125,520 $ 2,021 $ 127,541 ______________ * Includes amounts related to TBA Derivatives. Cash collateral received is not restricted as to use and is recognized in "Cash and cash equivalents" with a corresponding amount recognized in "Payable for cash received as collateral" in the accompanying consolidated balance sheets. The Company's collateral received in the form of securities from counterparties is disclosed in Note 4, Derivative Instruments . The Company’s Master Repurchase Agreements ("MRAs"), Master Securities Forward Transaction Agreements ("MSFTA") and ISDA Master Agreements ("ISDAs", and together with MRAs, the “Master Agreements”) generally provide (unless specified otherwise) that the Company may sell, pledge, rehypothecate, assign, invest, use, commingle, dispose of, or otherwise use in its business any posted collateral it holds, free from any claim or right of any nature whatsoever of the counterparty. MSFTAs govern the considerations and factors surrounding the settlement of certain forward settling transactions, TBAs and secured borrowing transactions by and between the Company and our counterparties. As of June 30, 2017 , $9.5 million of assets were pledged to the Company under the Master Agreements, of which $1.6 million were repledged by the Company to other counterparties at June 30, 2017 . As of December 31, 2016 , $34.2 million of assets were pledged to the Company under the Master Agreements, of which $2.7 million were repledged by the Company to other counterparties at December 31, 2016 . Since title to these assets remain with the counterparty under the Master Agreements, these assets are not reflected in the accompanying consolidated balance sheets. Offsetting Assets and Liabilities Certain of our repo borrowings and derivative transactions are governed by underlying agreements that generally provide for a right of offset under MNAs (or similar agreements), including in the event of default or in the event of bankruptcy of either party to the transactions. Under GAAP, if the Company has a contractual right of offset, the Company may offset the related asset and liability and report the net amount in the accompanying consolidated balance sheets. However, the Company reports amounts subject to its MRAs and ISDAs in the consolidated balance sheets on a gross basis without regard to such rights of offset. At June 30, 2017 and December 31, 2016 , the Company's derivative assets and liabilities (by type) are as follows (in thousands): June 30, 2017 Assets Liabilities Interest rate swap contracts $ 64,513 $ 883 Interest rate cap contracts 27,731 — TBA derivatives 276 5,842 Total derivative assets and liabilities 92,520 6,725 Derivatives not subject to a Master Netting Agreement 61,620 455 Total assets and liabilities subject to a Master Netting Agreement $ 30,900 $ 6,270 December 31, 2016 Assets Liabilities Interest rate swap contracts $ 80,608 $ — Interest rate cap contracts 42,532 — TBA derivatives 19,416 6,051 Total derivative assets and liabilities 142,556 6,051 Derivatives not subject to a Master Netting Agreement 75,033 — Total assets and liabilities subject to a Master Netting Agreement $ 67,523 $ 6,051 Below are summaries of the Company's assets and liabilities subject to offsetting provisions (in thousands): Assets Gross Amounts Not Offset in the Consolidated Balance Sheets As of Description Amount of Assets Presented in the Consolidated Balance Sheets Instruments Available for Offset Collateral Received (1) Net Amount (2) June 30, 2017 Derivative assets $ 30,900 $ 704 $ 26,452 $ 3,744 December 31, 2016 Derivative assets 67,523 3,145 49,801 14,577 Liabilities Gross Amounts Not Offset in the Consolidated Balance Sheets As of Description Amount of Liabilities Presented in the Consolidated Balance Sheets Instruments Available for Offset Collateral Pledged (1) Net Amount (2) June 30, 2017 Derivative liabilities $ 6,270 $ 704 $ 5,566 $ — June 30, 2017 Repurchase agreements and FHLBC Advances 9,370,845 — 9,370,845 — December 31, 2016 Derivative liabilities 6,051 3,145 2,906 — December 31, 2016 Repurchase agreements and FHLBC Advances 9,691,544 — 9,691,544 — ______________ (1) Collateral consists of Agency RMBS, U.S. Treasuries and Cash and cash equivalents. Excess collateral pledged is not shown for financial reporting purposes. (2) Net amount represents the net amount receivable from (in the case of assets) and payable to (in the case of liabilities) the counterparty in the event of default.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS The Company’s valuation techniques are based on observable and unobservable inputs. ASC 820 establishes a fair value hierarchy that prioritizes and ranks the level of market price observability used in measuring financial instruments. Market price observability is affected by a number of factors, including the type of financial instrument, the characteristics specific to the financial instrument, and the state of the marketplace, including the existence and transparency of transactions between market participants. Financial instruments with readily available quoted prices in active markets generally will have a higher degree of market price observability and a lesser degree of judgment used in measuring fair value. Financial instruments measured and reported at fair value are classified and disclosed based on the observability of inputs used in the determination, as follows: Level 1: Generally includes only unadjusted quoted prices that are available in active markets for identical financial instruments as of the reporting date. Level 2: Pricing inputs include quoted prices in active markets for similar instruments, quoted prices in less active or inactive markets for identical or similar instruments where multiple price quotes can be obtained, and other observable inputs, such as interest rates and yield curves. Level 3: Pricing inputs are unobservable for the financial instruments and include situations where there is little, if any, market activity for the financial instrument. These inputs require significant judgment or estimation by management when determining fair value and generally represent anything that does not meet the criteria of Levels 1 and 2. The estimated value of each asset reported at fair value using Level 3 inputs is approved by an internal committee composed of members of senior management, including our Chief Executive Officer, Chief Financial Officer, and other senior officers. Excluded from the tables below are short-term financial instruments carried in our unaudited consolidated financial statements at cost basis, which is deemed to approximate fair value, primarily due to the short duration of these instruments, including cash and cash equivalents, receivables, payables, and repo borrowings with initial terms of one year or less. Agency RMBS and U.S. Treasuries are generally valued based on prices provided by third-party pricing services, as derived from such services' pricing models. Inputs to the models may include, but are not limited to, reported trades, executable bid and ask prices, broker quotations, prices or yields of securities with similar characteristics, prepayment rates, benchmark curves or information pertaining to the issuer, as well as industry and economic events. The pricing services may also use a matrix approach, which considers information regarding securities with similar characteristics to determine the valuation for a security. All valuations we receive from third-party pricing services or broker quotes are non-binding. The pricing committee reviews all prices. To date, the Company has not adjusted any of the prices received from third-party pricing services or brokers. Our pricing review includes comparisons of similar market transactions, alternative third-party pricing services and broker quotes, or comparisons to a pricing model. To ensure proper classification within the fair value hierarchy in ASC 820, the Company reviews the third-party pricing services' methodologies periodically to understand whether observable or unobservable inputs are being used. We generally value swaps and caps using prices provided by broker quotations. Such broker quotations are based on the present value of fixed and projected floating rate cash flows over the term of the swap contract. Future cash flows are discounted to present value using swap rates provided by electronic data services or by brokers. "Other investments" is comprised of our investment in FHLBC stock and our net investment in a real estate asset at fair value, inclusive of the corresponding $3.7 million and $3.8 million of mortgage debt at June 30, 2017 and December 31, 2016 , respectively. Investment in real estate is considered to be a Level 3 asset to which we periodically apply valuation techniques and/or impairment analysis. The following tables provide a summary of the Company’s assets and liabilities that are measured at fair value on a recurring basis, as of June 30, 2017 and December 31, 2016 (in thousands): June 30, 2017 Fair Value Measurements Using Level 1 Level 2 Level 3 Total Assets Agency RMBS $ — $ 11,705,696 $ — $ 11,705,696 U.S. Treasuries 24,841 — — 24,841 Derivative assets — 92,520 — 92,520 Other investments — — 8,028 8,028 Total $ 24,841 $ 11,798,216 $ 8,028 $ 11,831,085 Liabilities Derivative liabilities — 6,725 — 6,725 Total $ — $ 6,725 $ — $ 6,725 December 31, 2016 Fair Value Measurements Using Level 1 Level 2 Level 3 Total Assets Agency RMBS $ — $ 12,599,045 $ — $ 12,599,045 U.S. Treasuries 49,686 — — 49,686 Derivative assets — 142,556 — 142,556 Other investments — — 8,028 8,028 Total $ 49,686 $ 12,741,601 $ 8,028 $ 12,799,315 Liabilities FHLBC Advances — — — — Derivative liabilities — 6,051 — 6,051 Total $ — $ 6,051 $ — $ 6,051 The table below presents a reconciliation of changes in Other investments classified as Level 3 and measured at fair value on a recurring basis in the accompanying consolidated balance sheets for the three months ended June 30, 2017 and 2016 . Level 3 Fair Value Reconciliation (In thousands) Three and Six Months Ended June 30, Other investments 2017 2016 Beginning balance Level 3 assets $ 8,028 $ 8,028 Change in net unrealized gain (loss) — — Gross purchases — — Gross sales — — Net gain (loss) on sales — — Transfers into (out of) Level 3 — — Ending balance Level 3 assets $ 8,028 $ 8,028 The fair value of our net investment in a real estate asset is primarily derived internally, and is based on inputs observed from sales transactions of similar assets. We also rely on available industry information about capitalization rates and expected trends in rents and occupancy in determining estimates of the fair value of real estate. The significant unobservable input used in the fair value measurement of our net investment in real estate is the capitalization rate, which the Company estimated to be between 4.0% and 4.9% at June 30, 2017 and December 31, 2016 .

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2017
Stockholders' Equity Note [Abstract]
Share Capital	STOCKHOLDERS' EQUITY The Company has authorized 500,000,000 shares of common stock having a par value of $0.01 per share. As of June 30, 2017 and December 31, 2016 , the Company had issued and outstanding 151,731,146 and 151,434,917 shares of common stock, respectively. The Company has authorized 50,000,000 shares of preferred stock having a par value of $0.01 per share. As of June 30, 2017 and December 31, 2016 , 3,000,000 shares of 7.75% Series A Cumulative Redeemable Preferred Stock ( $25.00 liquidation preference) were issued and outstanding. As of June 30, 2017 and December 31, 2016 , 8,000,000 shares of 7.50% Series B Cumulative Redeemable Preferred Stock ( $25.00 liquidation preference) were issued and outstanding. The Series A Preferred Stock and Series B Preferred Stock are not redeemable before August 3, 2017 and April 30, 2018, respectively, except under circumstances where it is necessary to preserve the Company's qualification as a REIT, for federal income tax purposes, or the occurrence of a change of control. On or after August 3, 2017 and April 30, 2018, the Company may, at its option, redeem any or all of the shares of the Series A Preferred Stock and Series B Preferred Stock, respectively, at $25.00 per share plus any accumulated and unpaid dividends to, but not including, the respective redemption date. The Series A Preferred Stock and Series B Preferred Stock have no stated maturity, and are not subject to a sinking fund requirement or mandatory redemption. Equity Offerings On May 22, 2017, the Company filed an automatically effective shelf registration statement on Form S-3 with the SEC (the "Registration Statement"). The Company may offer and sell, from time to time, shares of common stock, preferred stock and debt securities in one or more offerings pursuant to the prospectus that is a part of the registration statement. As of June 30, 2017 , the Company had not issued any shares of common stock, preferred stock or debt securities under the Registration Statement. Dividend Reinvestment and Direct Stock Purchase Plan ("DSPP") The Company sponsors a dividend reinvestment and direct stock purchase plan through which stockholders may purchase additional shares of common stock by reinvesting some or all cash dividends received on shares of common stock. Stockholders may also make optional cash purchases of shares of common stock subject to certain limitations detailed in the respective plan prospectus. For the six months ended June 30, 2017 the Company issued 1,618 shares for net proceeds of $14 thousand . For the six months ended June 30, 2016 the Company did not issue any shares under the DSPP. As of June 30, 2017 and December 31, 2016 , there were approximately 4.1 million shares available for issuance under the DSPP. Share Repurchase Program On November 15, 2012, the Company announced that its Board of Directors authorized the repurchase of shares of the Company’s common stock having an aggregate value of up to $250 million . Pursuant to this program, through July 20, 2014, the Company repurchased approximately $115.7 million in aggregate value of its shares of common stock on the open market. On July 21, 2014, the Company announced that its Board of Directors authorized the repurchase of shares of the Company's common stock having an aggregate value of up to $250 million , which included approximately $134.3 million available for repurchase under the November 2012 authorization. Subsequently, during 2014 we repurchased 172,549 shares at a weighted-average purchase price of $8.88 per share, for an aggregate purchase price of approximately $1.5 million . For the year ended December 31, 2015, the Company repurchased 10,559,493 shares at a weighted-average purchase price of $8.28 per share for an aggregate purchase price of approximately $87.7 million . For the year ended December 31, 2016 , the Company repurchased 673,166 shares at a weighted-average purchase price of $7.85 per share for an aggregate purchase price of approximately $5.3 million . Accordingly, the Company was authorized to repurchase shares of its common stock of approximately $155.5 million as of December 31, 2016 . For the six months ended June 30, 2017 , we did not repurchase any shares of the Company's common stock. For the six months ended June 30, 2016 , we repurchased 673,166 shares of the Company's common stock at a weighted-average purchase price of $7.85 , for an aggregate purchase price of approximately $5.3 million . Accordingly, the Company was authorized to repurchase shares of its common stock of approximately $155.5 million as of June 30, 2017 and June 30, 2016 . Restricted Stock Awards For the six months ended June 30, 2017 and 2016 , the Company granted 339,132 and 357,349 shares of restricted stock, respectively, to certain of its directors, officers and employees.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE Components of the computation of basic and diluted earnings per share ("EPS") are as follows (in thousands except per share amounts): Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Net income (loss) $ 50,225 $ 56,210 $ 84,245 $ 117,541 Less dividends on preferred shares (5,203 ) (5,203 ) (10,406 ) (10,406 ) Net income (loss) available to common stockholders 45,022 51,007 73,839 107,135 Less dividends paid: Common shares (37,700 ) (37,587 ) (75,394 ) (76,713 ) Unvested shares (232 ) (262 ) (465 ) (534 ) Undistributed earnings (loss) 7,090 13,158 (2,020 ) 29,888 Basic weighted-average shares outstanding: Common shares 150,800 150,405 150,691 150,591 Basic earnings (loss) per common share: Distributed earnings $ 0.25 $ 0.25 $ 0.50 $ 0.51 Undistributed earnings (loss) 0.05 0.09 (0.01 ) 0.20 Basic earnings (loss) per common share $ 0.30 $ 0.34 $ 0.49 $ 0.71 Diluted weighted-average shares outstanding: Common shares 150,800 150,405 150,691 150,591 Net effect of dilutive stock options (1) — — — — 150,800 150,405 150,691 150,591 Diluted earnings (loss) per common share: Distributed earnings $ 0.25 $ 0.25 $ 0.50 $ 0.51 Undistributed earnings 0.05 0.09 (0.01 ) 0.20 Diluted earnings (loss) per common share $ 0.30 $ 0.34 $ 0.49 $ 0.71 __________________ (1) For the three and six months ended June 30, 2017 and 2016 , the Company had no stock options outstanding.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES The Company enters into certain agreements that contain a variety of indemnifications, principally with broker-dealers. As of June 30, 2017 and December 31, 2016 , no claims have been asserted against the Company under these indemnification agreements. Accordingly, the Company has no liabilities recorded for these agreements as of June 30, 2017 and December 31, 2016 . The Company occupied leased office space for which the term expired on June 30, 2016. In September 2015, the Company entered into a new lease agreement with a commencement date of January 1, 2016, and an estimated rent commencement date of July 1, 2016 (the "New Lease"). The New Lease has an initial term of 84 months from the rent commencement date. All leases have been classified as operating leases. The Company’s aggregate future minimum lease payments total approximately $2.3 million . The following table details the lease payments (in thousands): Years Ending December 31, Lease Commitments 2017 (remaining) $ 179 2018 363 2019 373 2020 383 2021 393 Thereafter 606 $ 2,297

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS The Company has evaluated subsequent events through July 27, 2017 , the date these financial statements were issued, and determined that no events have occurred that would require adjustments to or disclosures in the accompanying unaudited consolidated financial statements.

Significant Accounting Polici18

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Basis Of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("GAAP") and the instructions to the Securities and Exchange Commission ("SEC") Form 10-Q and Article 10, Rule 10-01 of Regulation S-X. Accordingly, the financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. The unaudited consolidated financial statements should be read in conjunction with the Company’s audited financial statements as of and for the year ended December 31, 2016, included in the 2016 Annual Report. The results for interim periods are not necessarily indicative of the results to be expected for the entire fiscal year. The unaudited consolidated financial statements include the accounts of the Company and all of its subsidiaries. All intercompany balances and transactions have been eliminated. The unaudited consolidated financial statements of the Company have been prepared on the accrual basis of accounting in accordance with GAAP. The preparation of financial statements in conformity with GAAP requires management to make a number of estimates and assumptions that affect the amounts reported in the unaudited consolidated financial statements and accompanying footnotes. Actual results could differ from these estimates and the differences may be material.
Reclassification	Reclassification Prior to January 1, 2016, FHLBC Advances were presented and disclosed separately on the consolidated balance sheet and interest expense on all FHLBC Advances was reported in the aggregate with interest expense on repurchase agreements. Effective January 1, 2016, FHLBC Advances are presented on the balance sheet and disclosed in the aggregate, while interest expense on FHLBC Advances is reported separately from interest expense on repurchase agreements. Prior periods have been reclassified to conform to the current period presentation.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents represent cash held in banks, cash on hand, and liquid investments with original maturities of three months or less. We may have bank balances in excess of federally insured amounts; however, we deposit our cash and cash equivalents with high credit-quality institutions to minimize credit risk exposure. We have not experienced, and do not expect, any losses on our cash or cash equivalents.
Investments in Securities	Investments in Securities The Company's investment securities are accounted for in accordance with the Financial Accounting Standards Board's ("FASB") Accounting Standards Codification ("ASC") 320 -Investments-Debt and Equity Securities . These investments meet the requirements to be classified as available-for-sale under ASC 320. Therefore, our investment securities are recorded at fair market value on the consolidated balance sheets. The Company has chosen to make a fair value election pursuant to ASC 825 -Financial Instruments for its securities. Electing the fair value option requires the Company to record changes in the fair value of investments in the Consolidated Statement of Operations as a component of net unrealized gain (loss) on investments, which in management’s view more appropriately reflects the results of operations for a particular reporting period as all securities activities will be recorded in a similar manner. The Company records its security purchase and sale transactions, including forward settling transactions, on a trade date basis. Realized gains and losses on securities transactions are recorded on an identified cost basis.
Agency RMBS	Agency RMBS The Company's investments in Agency RMBS consist of pass-through certificates backed by fixed-rate, monthly-reset adjustable-rate loans ("ARMs") and Hybrid ARMs, the principal and interest of which are guaranteed by Fannie Mae, Freddie Mac or Ginnie Mae. Hybrid ARMs have interest rates that have an initial fixed period (typically three, five, seven or 10 years) and thereafter reset at regular intervals in a manner similar to ARMs.
Forward Settling Transactions	Forward Settling Transactions The Company engages in forward settling transactions to purchase or sell certain securities. Agency RMBS may include forward contracts for Agency RMBS purchases or sales of specified pools on a to-be-announced basis ("TBA Securities") that meet the regular-way scope exception in ASC 815 -Derivatives and Hedging ("ASC 815") , and are recorded on a trade date basis to the extent it is probable that we will take or make timely physical delivery of the related securities. The Company maintains security positions such that sufficiently liquid assets will be available to make payment on the settlement date for securities purchased. The Agency RMBS purchased at the forward settlement date are typically priced at a discount to securities for settlement in the current month. Securities purchased on a forward settling basis are carried at fair value and begin earning interest on the settlement date. Gains or losses may occur on these transactions due to changes in market conditions or the failure of counterparties to perform under the contract.
Investment Valuation	Investment and Derivative Valuation The Company has a pricing committee responsible for establishing valuation policies and procedures, and reviewing and approving valuations during monthly pricing meetings. The pricing committee is composed of individuals from the finance and investment teams and other members of senior management. See Note 7, Fair Value Measurements , for additional details related to the fair value of the Company's assets and liabilities.
Interest Income	Interest Income We record interest income and expense on an accrual basis. We accrue interest income based on the outstanding principal amount of the settled securities in our portfolio and their contractual terms. We amortize premiums and discounts using the effective interest method as prepayments occur, and this net amortization is either a reduction of or accretive to interest income from Agency RMBS in the accompanying Consolidated Statements of Operations. The Company does not estimate prepayments when calculating the yield to maturity on Agency RMBS.
Other investments	Other Investments CYS Insurance was a member of the FHLBC. As a condition of its membership in the FHLBC, CYS Insurance was required to maintain FHLBC stock, both for membership and for the level of advances from the FHLBC to CYS Insurance. The Company accounted for its investment in FHLBC stock as a cost method investment in "Other investments" in the accompanying consolidated balance sheets in accordance with ASC 325, Investments - Other . The Company periodically evaluated FHLBC stock for impairment in accordance with ASC 320 -Investments-Debt and Equity Securities . Also included in other investments is a net investment in real estate that is recorded at fair value, inclusive of $3.7 million of corresponding mortgage debt, with changes in estimated fair value recognized in the accompanying Consolidated Statements of Operations.
Repurchase Agreements and FHLBC Advances	Repurchase Agreements and FHLBC Advances Prior to the Final Rule effective as of February 19, 2016, which precluded the Company from securing new FHLBC Advances, we entered into FHLBC Advances, some of which had an initial maturity of more than one year that were collateralized by the Company's Agency RMBS and U.S. Treasuries (collectively, "Debt Securities"). The Company chose to make a fair value election pursuant to ASC 825 -Financial Instruments for FHLBC Advances with initial terms greater than one year and, therefore, this debt was recorded at fair market value in the accompanying consolidated balance sheets. The unpaid principal balance of FHLBC Advances with initial maturities less than one year generally approximated fair value due to the short-term nature of the instruments. We priced FHLBC Advances with an initial maturity greater than one year daily through a pricing service that used a discounted cash flow model to value the debt, and we periodically validated the prices we received through this process. Changes in the fair market value were recorded in current period earnings in the accompanying Consolidated Statements of Operations as a component of net unrealized gain (loss) on FHLBC Advances. Electing the fair value option permitted the Company to record changes in the fair value of FHLBC Advances along with that of our investments in the Consolidated Statements of Operations which, in management’s view, more appropriately reflect the results of operations for a particular reporting period as all income producing assets and liabilities are recognized in a consistent manner. Borrowings under repurchase agreements ("repo borrowings") are, and FHLBC Advances were, collateralized by the Company’s Debt Securities. The Company’s repo borrowing counterparties are institutional dealers in fixed income securities and large financial institutions, and CYS Insurance's counterparty for FHLBC Advances was the FHLBC. Collateral pledged on repo borrowings is valued daily, and collateral that was pledged on FHLBC Advances was valued periodically, and our counterparties may require posting of additional collateral when the fair value of pledged collateral declines. Repo borrowing counterparties have, and the FHLBC had, the right to sell or repledge collateral pledged under repo borrowings and FHLBC Advances. We account for our repo borrowings as short-term indebtedness under ASC 470 -Debt; accordingly, these short-term instruments are reflected in our financial statements at their amortized cost, which approximates fair value due to their short-term nature.
Derivative Instruments	Derivative Instruments Included in Derivative Instruments are interest rate swaps and interest rate caps and TBA Derivatives (defined below). The Company uses interest rate swaps and caps (a "swap" or "cap", respectively) to economically hedge a portion of its exposure to market risks, including interest rate and extension risk. The objective of our risk management strategy is to reduce fluctuations in stockholders’ equity over a range of interest rate scenarios. In particular, we attempt to manage the risk of the cost of our variable rate liabilities increasing during a period of rising interest rates. During the term of a swap or cap, the Company makes and/or receives periodic payments and records unrealized gains or losses as a result of marking the swap or cap to fair value. We report the periodic payments and amortization of premiums on cap contracts under swap and cap interest expense in the accompanying Consolidated Statements of Operations . When the Company terminates a swap or cap, we record a realized gain or loss equal to the difference between the proceeds from (or the cost of) closing the transaction and the Company's cost basis in the contract, if any. Swaps involve a risk that interest rates will move contrary to the Company’s expectations, thereby increasing the Company’s payment obligation. The Company's swaps and caps may be subject to a master netting arrangement ("MNA"), pursuant to which the Company may be exposed to credit loss in the event of non-performance by the counterparty to the swap or cap, limited to the fair value of collateral posted in excess of the fair value of the contract in a net liability position and the shortage of the fair value of collateral posted for the contract in a net asset position. As of June 30, 2017 and December 31, 2016, the Company did not anticipate non-performance by any counterparty. Should interest rates move contrary to the Company's expectations, the Company may not achieve the anticipated benefits of the interest rate swap or cap and may realize a loss. While the Company's derivative agreements generally permit netting or setting-off derivative assets and liabilities with the counterparty, the Company reports derivative assets and liabilities on a gross basis in the accompanying consolidated balance sheets. Derivatives are accounted for in accordance with ASC 815 which requires recognition of all derivatives as either assets or liabilities at fair value in the accompanying consolidated balance sheets with changes in fair value recognized in the accompanying Consolidated Statements of Operations in "Net realized and unrealized gain (loss) on derivative instruments". Cash receipts and payments related to derivative instruments are classified in the accompanying Consolidated Statements of Cash Flows in accordance with GAAP in both the operating and investing activities sections. The Company enters into TBA dollar roll transactions whereby the Company is not contractually obligated to accept delivery on the settlement date ("TBA Derivatives"). TBA Derivatives are accounted for as a series of derivative transactions. The fair value of TBA Derivatives is based on similar methods used to value Agency RMBS with gains and losses recorded in Net realized and unrealized gains (losses) on derivative instruments in the accompanying Consolidated Statements of Operations . TBA Derivative transactions involve moving the settlement of a TBA contract out to a later date by entering into an offsetting short position (referred to as a "pair off"), net settling the paired off positions for cash, and simultaneously purchasing a similar TBA contract for a later settlement date. The Company records such pair offs on a gross basis such that there is a sale of the original TBA Derivative and a subsequent purchase of a new TBA Derivative. None of the Company's derivatives have been designated as hedging instruments for accounting purposes. Effective January 1, 2016, the Company recognized all TBAs that do not qualify for the regular-way scope exception under ASC 815 as derivatives.
Income Taxes	Income Taxes The Company has elected to be treated as a REIT under the Code. The Company will generally not be subject to federal income tax to the extent that it distributes 90% of its taxable income, after application of available tax attributes, within the time limits prescribed by the Code and as long as it satisfies the ongoing REIT requirements including meeting certain asset, income and stock ownership tests.
Leases	Leases The Company occupies leased office space. The Company’s lease is accounted for in accordance with ASC 840 -Leases , and is classified as an operating lease. Rent expense is amortized on a straight-line basis over the lease term and is included in "General, administrative and other expense" in the accompanying Consolidated Statements of Operations.
Stock-based Compensation	Stock-based compensation The Company applies the provisions of ASC 718- Compensation-Stock Compensation , with regard to its equity incentive plans. ASC 718 covers a wide range of share-based compensation arrangements including stock options, restricted stock plans, performance-based awards, stock appreciation rights and employee stock purchase plans. ASC 718 requires that compensation costs relating to stock-based payment transactions be recognized in the consolidated financial statements. Compensation costs related to restricted common shares issued are measured at their estimated fair value at the grant date, and are amortized and expensed over the vesting period on a straight-line basis.
Earnings Per Share	Earnings Per Share ("EPS") The Company computes basic EPS using the two-class method by dividing net income (loss), after adjusting for the impact of unvested stock awards deemed to be participating securities, by the weighted-average number of common shares outstanding, calculated excluding unvested stock awards. The Company computes diluted EPS by dividing net income (loss), after adjusting for the impact of unvested stock awards deemed to be participating securities, by the weighted-average number of common shares outstanding, calculated excluding unvested stock awards, giving effect to common stock options and warrants, if they are not anti-dilutive. See Note 9, Earnings Per Share for EPS computations.
Recent Accounting Pronouncements	Recent Accounting Pronouncements The following table provides a brief description of recent accounting pronouncements that could potentially impact the Company's unaudited consolidated financial statements: Accounting Standard Description Required Date of Adoption Anticipated Effect on the Financial Statements ASU 2017-09 Compensation - Stock Compensation (Topic 718); Scope of Modification Accounting On May 10, 2017, the FASB issued ASU 2017-09, which amends the scope of modification accounting for share-based payment arrangements. The ASU provides guidance on the types of changes to the terms or conditions of share-based payment awards to which an entity would be required to apply modification accounting under ASC 718, (Compensation - Stock Compensation). Specifically, an entity would not apply modification accounting if the fair value, vesting conditions, and classification of the awards are the same immediately before and after the modification. Effective for annual reporting periods, including interim periods within those annual reporting periods, beginning after December 15, 2017. Early adoption is permitted, including adoption in any interim period. Not expected to have a significant impact on the consolidated financial statements. ASU 2017-05 Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20) Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets On February 22, 2017, the FASB issued ASU 2017-05, which clarifies the scope of the Board’s recently established guidance on nonfinancial asset derecognition (ASC 610-20) as well as the accounting for partial sales of nonfinancial assets. The ASU conforms the derecognition guidance on nonfinancial assets with the model for transactions in the new revenue standard (ASC 606, as amended). The FASB issued the ASU in response to stakeholder feedback indicating that (1) the meaning of the term “in-substance nonfinancial asset” is unclear because the Board’s new revenue standard does not define it and (2) the scope of the guidance on nonfinancial assets is confusing and complex and does not specify how a partial sales transaction should be accounted for or which model entities should apply. January 1, 2018. The effective date of the new guidance aligns with the requirements in the new revenue standard. If the entity decides to early adopt the ASU’s guidance, it must also early adopt ASC 606-Revenue from Contracts with Customers (and vice versa). Not expected to have a significant impact on the consolidated financial statements. Accounting Standard Description Required Date of Adoption Anticipated Effect on the Financial Statements ASU 2017-01 Business Combinations (Topic 805) Clarifying the Definition of a Business On January 5, 2017, the FASB issued ASU 2017-01 to clarify the definition of a business in ASC 805. The FASB issued the ASU in response to stakeholder feedback that the definition of a business in ASC 805 is being applied too broadly. In addition, stakeholders said that analyzing transactions under the current definition is difficult and costly. Concerns about the definition of a business were among the primary issues raised in connection with the Financial Accounting Foundation’s post-implementation review report on FASB Statement No. 141(R), Business Combinations (codified in ASC 805). The amendments in the ASU are intended to make application of the guidance more consistent and cost-efficient. Real estate is less likely to be a "business" which will lead to more capitalization of transaction costs-vs-expensing. January 1, 2018 (early adoption permitted). Not expected to have a significant impact on the consolidated financial statements. ASU 2016-15 Statement of Cash Flows (Topic 230) Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15") (a consensus of the Emerging Issues Task Force) On August 26, 2016, the FASB issued ASU 2016-15, which amends ASC 230, Statement of Cash Flows ("ASC 230), to add or clarify guidance on the classification of certain cash receipts and payments in the statement of cash flows. ASC 230 lacks consistent principles for evaluating the classification of cash payments and receipts in the statement of cash flows. This has led to diversity in practice and, in certain circumstances, financial statement restatements. Consequently, the FASB issued ASU 2016-15 with the intent of reducing diversity in practice with respect to certain types of cash flows. January 1, 2018 (early adoption is permitted). Entities must apply the guidance retrospectively to all periods presented but may apply it prospectively if retrospective application would be impracticable. Not expected to have a significant impact on the consolidated financial statements. ASU 2016-02 Leases (Topic 842) The amendments require lessees to recognize a right-of-use asset and a liability to make lease payments in the balance sheets for most leases. The accounting for lessors is largely unchanged. January 1, 2019 (early adoption permitted). Not expected to have a significant impact on the consolidated financial statements. ASU 2016-01 Financial Instruments - Overall (Subtopic 825-10) Recognition and Measurement of Financial Assets and Financial Liabilities The amendments address certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. January 1, 2018 (early adoption permitted for a provision related to presentation of instrument-specific credit risk of liabilities accounted for under the fair value option). Not expected to have a significant impact on the consolidated financial statements.

Significant Accounting Polici19

Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Schedule of Prospective Adoption of New Accounting Pronouncements	The following table provides a brief description of recent accounting pronouncements that could potentially impact the Company's unaudited consolidated financial statements: Accounting Standard Description Required Date of Adoption Anticipated Effect on the Financial Statements ASU 2017-09 Compensation - Stock Compensation (Topic 718); Scope of Modification Accounting On May 10, 2017, the FASB issued ASU 2017-09, which amends the scope of modification accounting for share-based payment arrangements. The ASU provides guidance on the types of changes to the terms or conditions of share-based payment awards to which an entity would be required to apply modification accounting under ASC 718, (Compensation - Stock Compensation). Specifically, an entity would not apply modification accounting if the fair value, vesting conditions, and classification of the awards are the same immediately before and after the modification. Effective for annual reporting periods, including interim periods within those annual reporting periods, beginning after December 15, 2017. Early adoption is permitted, including adoption in any interim period. Not expected to have a significant impact on the consolidated financial statements. ASU 2017-05 Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20) Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets On February 22, 2017, the FASB issued ASU 2017-05, which clarifies the scope of the Board’s recently established guidance on nonfinancial asset derecognition (ASC 610-20) as well as the accounting for partial sales of nonfinancial assets. The ASU conforms the derecognition guidance on nonfinancial assets with the model for transactions in the new revenue standard (ASC 606, as amended). The FASB issued the ASU in response to stakeholder feedback indicating that (1) the meaning of the term “in-substance nonfinancial asset” is unclear because the Board’s new revenue standard does not define it and (2) the scope of the guidance on nonfinancial assets is confusing and complex and does not specify how a partial sales transaction should be accounted for or which model entities should apply. January 1, 2018. The effective date of the new guidance aligns with the requirements in the new revenue standard. If the entity decides to early adopt the ASU’s guidance, it must also early adopt ASC 606-Revenue from Contracts with Customers (and vice versa). Not expected to have a significant impact on the consolidated financial statements. Accounting Standard Description Required Date of Adoption Anticipated Effect on the Financial Statements ASU 2017-01 Business Combinations (Topic 805) Clarifying the Definition of a Business On January 5, 2017, the FASB issued ASU 2017-01 to clarify the definition of a business in ASC 805. The FASB issued the ASU in response to stakeholder feedback that the definition of a business in ASC 805 is being applied too broadly. In addition, stakeholders said that analyzing transactions under the current definition is difficult and costly. Concerns about the definition of a business were among the primary issues raised in connection with the Financial Accounting Foundation’s post-implementation review report on FASB Statement No. 141(R), Business Combinations (codified in ASC 805). The amendments in the ASU are intended to make application of the guidance more consistent and cost-efficient. Real estate is less likely to be a "business" which will lead to more capitalization of transaction costs-vs-expensing. January 1, 2018 (early adoption permitted). Not expected to have a significant impact on the consolidated financial statements. ASU 2016-15 Statement of Cash Flows (Topic 230) Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15") (a consensus of the Emerging Issues Task Force) On August 26, 2016, the FASB issued ASU 2016-15, which amends ASC 230, Statement of Cash Flows ("ASC 230), to add or clarify guidance on the classification of certain cash receipts and payments in the statement of cash flows. ASC 230 lacks consistent principles for evaluating the classification of cash payments and receipts in the statement of cash flows. This has led to diversity in practice and, in certain circumstances, financial statement restatements. Consequently, the FASB issued ASU 2016-15 with the intent of reducing diversity in practice with respect to certain types of cash flows. January 1, 2018 (early adoption is permitted). Entities must apply the guidance retrospectively to all periods presented but may apply it prospectively if retrospective application would be impracticable. Not expected to have a significant impact on the consolidated financial statements. ASU 2016-02 Leases (Topic 842) The amendments require lessees to recognize a right-of-use asset and a liability to make lease payments in the balance sheets for most leases. The accounting for lessors is largely unchanged. January 1, 2019 (early adoption permitted). Not expected to have a significant impact on the consolidated financial statements. ASU 2016-01 Financial Instruments - Overall (Subtopic 825-10) Recognition and Measurement of Financial Assets and Financial Liabilities The amendments address certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. January 1, 2018 (early adoption permitted for a provision related to presentation of instrument-specific credit risk of liabilities accounted for under the fair value option). Not expected to have a significant impact on the consolidated financial statements.

Investments in Securities (Tabl

Investments in Securities (Tables)	6 Months Ended
	Jun. 30, 2017
Available-for-sale Securities [Abstract]
Available-for-sale Securities	The available-for-sale portfolio consisted of the following as of June 30, 2017 and December 31, 2016 (in thousands): June 30, 2017 Asset Type Amortized Cost Gross Unrealized Loss Gross Unrealized Gain Fair Value Fannie Mae Certificates Fixed Rate $ 8,986,881 $ (21,649 ) $ 41,581 $ 9,006,813 ARMs 243,346 (1,303 ) 1,413 243,456 Total Fannie Mae 9,230,227 (22,952 ) 42,994 9,250,269 Freddie Mac Certificates Fixed Rate 2,355,189 (11,091 ) 11,281 2,355,379 ARMs 67,314 (147 ) 482 67,649 Total Freddie Mac 2,422,503 (11,238 ) 11,763 2,423,028 Ginnie Mae Certificates Fixed Rate 1,745 (51 ) — 1,694 ARMs 30,304 — 401 30,705 Ginnie Mae Certificates - ARMs 32,049 (51 ) 401 32,399 Total Agency RMBS 11,684,779 (34,241 ) 55,158 11,705,696 U.S. Treasuries 24,984 (143 ) — 24,841 Total $ 11,709,763 $ (34,384 ) $ 55,158 $ 11,730,537 December 31, 2016 Asset Type Amortized Cost Gross Unrealized Loss Gross Unrealized Gain Fair Value Fannie Mae Certificates Fixed Rate $ 9,505,262 $ (81,783 ) $ 36,622 $ 9,460,101 ARMs 301,029 (2,668 ) 1,571 299,932 Total Fannie Mae 9,806,291 (84,451 ) 38,193 9,760,033 Freddie Mac Certificates Fixed Rate 2,799,604 (55,624 ) 7,659 2,751,639 ARMs 50,641 (514 ) 606 50,733 Total Freddie Mac 2,850,245 (56,138 ) 8,265 2,802,372 Ginnie Mae Certificates Fixed Rate 1,856 (54 ) — 1,802 ARMs 34,390 — 448 34,838 Total Ginnie Mae 36,246 (54 ) 448 36,640 Total Agency RMBS 12,692,782 (140,643 ) 46,906 12,599,045 U.S. Treasuries 49,952 (266 ) — 49,686 Total $ 12,742,734 $ (140,909 ) $ 46,906 $ 12,648,731 The following table presents the gross unrealized loss and fair values of our available-for-sale investments by length of time that such securities have been in a continuous unrealized loss position as of June 30, 2017 and December 31, 2016 (in thousands): Unrealized loss positions Less than 12 Months Greater than 12 months Total As of Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss June 30, 2017 $ 4,711,452 $ (34,384 ) $ — $ — $ 4,711,452 $ (34,384 ) December 31, 2016 9,264,265 (140,909 ) — — 9,264,265 (140,909 ) The following table summarizes the Company’s available-for-sale investments as of June 30, 2017 and December 31, 2016 , according to their estimated remaining weighted-average maturity classifications: June 30, 2017 December 31, 2016 Fair Value Amortized Cost Fair Value Amortized Cost Less than one year $ 24,841 $ 24,984 $ — $ — Greater than one year through five years 6,877,266 6,849,276 3,765,037 3,744,614 Greater than five years through ten years 4,828,430 4,835,503 8,864,309 8,978,537 Greater than ten years — — 19,385 19,583 Total $ 11,730,537 $ 11,709,763 $ 12,648,731 $ 12,742,734 The following table summarizes our net realized gain (loss) from the sale of available-for-sale investments for the three months ended June 30, 2017 and 2016 (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Available-for-sale investments, at cost $ 1,265,490 $ 5,408,055 $ 4,863,982 $ 6,805,243 Proceeds from sale of available-for-sale investments 1,245,659 5,444,414 4,778,107 6,842,804 Net realized gain (loss) on sale of available-for-sale investments $ (19,831 ) $ 36,359 (85,875 ) 37,561 Gross gain on sale of available-for-sale investments $ 2,270 $ 36,743 10,873 42,126 Gross (loss) on sale of available-for-sale investments (22,101 ) (384 ) (96,748 ) (4,565 ) Net realized gain (loss) on sale of available-for-sale investments $ (19,831 ) $ 36,359 $ (85,875 ) $ 37,561 The components of the carrying value of available-for-sale securities at June 30, 2017 and December 31, 2016 are presented below. A premium purchase price is generally due to the average coupon interest rates on these investments being higher than prevailing market rates; similarly, a discount purchase price is generally due to the average coupon interest rate on these investments being lower than prevailing market rates. (in thousands) June 30, 2017 December 31, 2016 Principal balance $ 11,341,310 $ 12,285,204 Unamortized premium 368,542 458,709 Unamortized discount (89 ) (1,179 ) Gross unrealized gains 55,158 46,906 Gross unrealized losses (34,384 ) (140,909 ) Fair value $ 11,730,537 $ 12,648,731

Derivative Instruments (Tables)

Derivative Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Interest Rate Derivatives [Table Text Block]	The Company had the following activity in interest rate swap and cap transactions during the three and six months ended June 30, 2017 and 2016 (in thousands): June 30, 2017 June 30, 2016 Trade Date Transaction Notional Trade Date Transaction Notional April 2017 Terminated (500,000 ) January 2016 Terminated $ (500,000 ) April 2017 Opened 500,000 May 2016 Terminated (2,200,000 ) May 2017 Terminated (500,000 ) May 2016 Opened 1,700,000 May 2017 Opened 500,000 Net Decrease $ (1,000,000 ) June 2017 Opened 100,000 Net Increase $ 100,000
Schedule of Derivative Instruments	The table below summarizes information about our derivative and other hedging instrument assets and liabilities as of June 30, 2017 and December 31, 2016 (in thousands): June 30, 2017 December 31, 2016 Derivative and Other Hedging Instruments - Assets Consolidated Balance Sheets Notional Fair Value Notional Fair Value Interest Rate Swaps Derivative assets, at fair value $ 5,550,000 $ 64,513 $ 6,450,000 $ 80,608 Interest Rate Caps Derivative assets, at fair value 2,500,000 27,731 2,500,000 42,532 TBA Derivatives Derivative assets, at fair value 255,600 276 2,417,000 19,416 Total derivative assets at fair value $ 8,305,600 $ 92,520 $ 11,367,000 $ 142,556 Derivative and Other Hedging Instruments - Liabilities Consolidated Balance Sheets Notional Fair Value Notional Fair Value Interest Rate Swaps Derivative liabilities, at fair value $ 1,000,000 $ (883 ) $ — $ — Interest Rate Caps Derivative liabilities, at fair value — — — — TBA Derivatives Derivative liabilities, at fair value 1,486,850 (5,842 ) 1,870,000 (6,051 ) Total derivative liabilities at fair value $ 2,486,850 $ (6,725 ) $ 1,870,000 $ (6,051 ) The average notional value of the Company's TBA Derivatives during the three and six months ended June 30, 2017 was $1.7 billion and $1.6 billion , respectively. The average notional value of the Company's TBA Derivatives during the three and six months ended June 30, 2016 was $1.1 billion and $1.3 billion , respectively. The average notional value of the Company's swaps and caps during the three and six months ended June 30, 2017 was $9.0 billion . The average notional value of the Company's swaps and caps during the three and six months ended June 30, 2016 was $9.7 billion and $9.9 billion , respectively. The following table presents information about the net realized and unrealized gain (loss) on swap, cap and TBA Derivatives for the three and six months ended June 30, 2017 and 2016 (in thousands): Three Months Ended June 30, Six Months Ended June 30, Derivative Instrument Type Location of Gain (Loss) on Derivative Instruments 2017 2016 2017 2016 Interest rate swaps and caps Swap and cap interest expense $ (8,434 ) $ (14,779 ) $ (16,761 ) $ (33,177 ) Interest rate swaps, caps and TBA Derivatives Net realized and unrealized gain (loss) on derivative instruments (18,324 ) (44,535 ) (19,336 ) (185,059 ) Interest rate swaps, caps and TBA Derivatives Net gain (loss) on derivative instruments $ (26,758 ) $ (59,314 ) $ (36,097 ) $ (218,236 ) At June 30, 2017 and December 31, 2016 , the Company's derivative assets and liabilities (by type) are as follows (in thousands): June 30, 2017 Assets Liabilities Interest rate swap contracts $ 64,513 $ 883 Interest rate cap contracts 27,731 — TBA derivatives 276 5,842 Total derivative assets and liabilities 92,520 6,725 Derivatives not subject to a Master Netting Agreement 61,620 455 Total assets and liabilities subject to a Master Netting Agreement $ 30,900 $ 6,270 December 31, 2016 Assets Liabilities Interest rate swap contracts $ 80,608 $ — Interest rate cap contracts 42,532 — TBA derivatives 19,416 6,051 Total derivative assets and liabilities 142,556 6,051 Derivatives not subject to a Master Netting Agreement 75,033 — Total assets and liabilities subject to a Master Netting Agreement $ 67,523 $ 6,051

Repurchase Agreements and FHL22

Repurchase Agreements and FHLB Advances (Tables)	6 Months Ended
	Jun. 30, 2017
Banking and Thrift [Abstract]
Schedule Of Company's Borrowings	Certain information with respect to the Company’s repo borrowings outstanding at the balance sheet dates is summarized in the table below. (in thousands) June 30, 2017 December 31, 2016 Outstanding repurchase agreements $ 9,370,845 $ 9,691,544 Interest accrued thereon $ 17,649 $ 16,170 Weighted-average borrowing rate 1.23 % 0.89 % Weighted-average remaining maturity (in days) 79.9 53.3 Fair value of pledged collateral (1) $ 9,798,063 $ 10,198,641 __________________ (1) Collateral for repo borrowings consists of Agency RMBS and U.S. Treasuries.
Schedule of Repurchase Agreements	The following table presents the remaining contractual maturity of repo borrowings by collateral type as of June 30, 2017 and December 31, 2016 (in thousands): Remaining contractual maturity June 30, 2017 Up to 30 days 30-90 days Greater than 90 days Total Agency RMBS $ 3,399,706 $ 3,114,492 $ 2,856,647 $ 9,370,845 Total $ 3,399,706 $ 3,114,492 $ 2,856,647 $ 9,370,845 December 31, 2016 Agency RMBS $ 4,113,286 $ 3,694,937 $ 1,883,321 $ 9,691,544 Total $ 4,113,286 $ 3,694,937 $ 1,883,321 $ 9,691,544

Pledged Assets (Tables)

Pledged Assets (Tables)	6 Months Ended
	Jun. 30, 2017
Transfers and Servicing [Abstract]
Assets Pledged to Counterparties	The following tables summarize our assets pledged as collateral under repo borrowings, and derivative instruments by type, including securities pledged related to securities purchased or sold but not yet settled, as of June 30, 2017 and December 31, 2016 (in thousands): June 30, 2017 Asset Type Repurchase Agreements Derivative Instruments * Forward Settling Trades (TBAs) Total Agency RMBS - fair value $ 9,798,173 $ 34,751 $ 1,980 $ 9,834,904 U.S. Treasuries - fair value 301 26,126 — 26,427 Accrued interest on pledged securities 27,233 91 10 27,334 Cash — — — — Total $ 9,825,707 $ 60,968 $ 1,990 $ 9,888,665 December 31, 2016 Asset Type Repurchase Agreements Derivative Instruments * Forward Settling Trades (TBAs) Total Agency RMBS - fair value $ 10,197,244 $ 33,311 $ 2,610 $ 10,233,165 U.S. Treasuries - fair value 1,398 45,730 — 47,128 Accrued interest on pledged securities 27,730 87 7 27,824 Cash — 600 — 600 Total $ 10,226,372 $ 79,728 $ 2,617 $ 10,308,717
Assets Pledged from Counterparties	As of June 30, 2017 and December 31, 2016 , we had assets pledged to us as collateral under our repurchase agreements, derivative agreements and TBAs as summarized in the tables below (in thousands): June 30, 2017 Asset Type Repurchase Agreements Derivative Instruments * Forward Settling Trades (TBAs) Total Agency RMBS - fair value $ — $ — $ — $ — U.S. Treasuries - fair value 411 9,115 — 9,526 Accrued interest on pledged securities 2 38 — 40 Cash — 64,402 — 64,402 Total $ 413 $ 73,555 $ — $ 73,968 December 31, 2016 Asset Type Repurchase Agreements Derivative Instruments * Forward Settling Trades (TBAs) Total Agency RMBS - fair value $ — $ 3,016 $ 1,293 $ 4,309 U.S. Treasuries - fair value — 29,937 — 29,937 Accrued interest on pledged securities — 1,788 4 1,792 Cash — 90,779 724 91,503 Total $ — $ 125,520 $ 2,021 $ 127,541
Schedule of Derivative Instruments	The table below summarizes information about our derivative and other hedging instrument assets and liabilities as of June 30, 2017 and December 31, 2016 (in thousands): June 30, 2017 December 31, 2016 Derivative and Other Hedging Instruments - Assets Consolidated Balance Sheets Notional Fair Value Notional Fair Value Interest Rate Swaps Derivative assets, at fair value $ 5,550,000 $ 64,513 $ 6,450,000 $ 80,608 Interest Rate Caps Derivative assets, at fair value 2,500,000 27,731 2,500,000 42,532 TBA Derivatives Derivative assets, at fair value 255,600 276 2,417,000 19,416 Total derivative assets at fair value $ 8,305,600 $ 92,520 $ 11,367,000 $ 142,556 Derivative and Other Hedging Instruments - Liabilities Consolidated Balance Sheets Notional Fair Value Notional Fair Value Interest Rate Swaps Derivative liabilities, at fair value $ 1,000,000 $ (883 ) $ — $ — Interest Rate Caps Derivative liabilities, at fair value — — — — TBA Derivatives Derivative liabilities, at fair value 1,486,850 (5,842 ) 1,870,000 (6,051 ) Total derivative liabilities at fair value $ 2,486,850 $ (6,725 ) $ 1,870,000 $ (6,051 ) The average notional value of the Company's TBA Derivatives during the three and six months ended June 30, 2017 was $1.7 billion and $1.6 billion , respectively. The average notional value of the Company's TBA Derivatives during the three and six months ended June 30, 2016 was $1.1 billion and $1.3 billion , respectively. The average notional value of the Company's swaps and caps during the three and six months ended June 30, 2017 was $9.0 billion . The average notional value of the Company's swaps and caps during the three and six months ended June 30, 2016 was $9.7 billion and $9.9 billion , respectively. The following table presents information about the net realized and unrealized gain (loss) on swap, cap and TBA Derivatives for the three and six months ended June 30, 2017 and 2016 (in thousands): Three Months Ended June 30, Six Months Ended June 30, Derivative Instrument Type Location of Gain (Loss) on Derivative Instruments 2017 2016 2017 2016 Interest rate swaps and caps Swap and cap interest expense $ (8,434 ) $ (14,779 ) $ (16,761 ) $ (33,177 ) Interest rate swaps, caps and TBA Derivatives Net realized and unrealized gain (loss) on derivative instruments (18,324 ) (44,535 ) (19,336 ) (185,059 ) Interest rate swaps, caps and TBA Derivatives Net gain (loss) on derivative instruments $ (26,758 ) $ (59,314 ) $ (36,097 ) $ (218,236 ) At June 30, 2017 and December 31, 2016 , the Company's derivative assets and liabilities (by type) are as follows (in thousands): June 30, 2017 Assets Liabilities Interest rate swap contracts $ 64,513 $ 883 Interest rate cap contracts 27,731 — TBA derivatives 276 5,842 Total derivative assets and liabilities 92,520 6,725 Derivatives not subject to a Master Netting Agreement 61,620 455 Total assets and liabilities subject to a Master Netting Agreement $ 30,900 $ 6,270 December 31, 2016 Assets Liabilities Interest rate swap contracts $ 80,608 $ — Interest rate cap contracts 42,532 — TBA derivatives 19,416 6,051 Total derivative assets and liabilities 142,556 6,051 Derivatives not subject to a Master Netting Agreement 75,033 — Total assets and liabilities subject to a Master Netting Agreement $ 67,523 $ 6,051
Offsetting Assets	Below are summaries of the Company's assets and liabilities subject to offsetting provisions (in thousands): Assets Gross Amounts Not Offset in the Consolidated Balance Sheets As of Description Amount of Assets Presented in the Consolidated Balance Sheets Instruments Available for Offset Collateral Received (1) Net Amount (2) June 30, 2017 Derivative assets $ 30,900 $ 704 $ 26,452 $ 3,744 December 31, 2016 Derivative assets 67,523 3,145 49,801 14,577 Liabilities Gross Amounts Not Offset in the Consolidated Balance Sheets As of Description Amount of Liabilities Presented in the Consolidated Balance Sheets Instruments Available for Offset Collateral Pledged (1) Net Amount (2) June 30, 2017 Derivative liabilities $ 6,270 $ 704 $ 5,566 $ — June 30, 2017 Repurchase agreements and FHLBC Advances 9,370,845 — 9,370,845 — December 31, 2016 Derivative liabilities 6,051 3,145 2,906 — December 31, 2016 Repurchase agreements and FHLBC Advances 9,691,544 — 9,691,544 —
Offsetting Liabilities	Liabilities Gross Amounts Not Offset in the Consolidated Balance Sheets As of Description Amount of Liabilities Presented in the Consolidated Balance Sheets Instruments Available for Offset Collateral Pledged (1) Net Amount (2) June 30, 2017 Derivative liabilities $ 6,270 $ 704 $ 5,566 $ — June 30, 2017 Repurchase agreements and FHLBC Advances 9,370,845 — 9,370,845 — December 31, 2016 Derivative liabilities 6,051 3,145 2,906 — December 31, 2016 Repurchase agreements and FHLBC Advances 9,691,544 — 9,691,544 — ______________ (1) Collateral consists of Agency RMBS, U.S. Treasuries and Cash and cash equivalents. Excess collateral pledged is not shown for financial reporting purposes. (2) Net amount represents the net amount receivable from (in the case of assets) and payable to (in the case of liabilities) the counterparty in the event of default.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following tables provide a summary of the Company’s assets and liabilities that are measured at fair value on a recurring basis, as of June 30, 2017 and December 31, 2016 (in thousands): June 30, 2017 Fair Value Measurements Using Level 1 Level 2 Level 3 Total Assets Agency RMBS $ — $ 11,705,696 $ — $ 11,705,696 U.S. Treasuries 24,841 — — 24,841 Derivative assets — 92,520 — 92,520 Other investments — — 8,028 8,028 Total $ 24,841 $ 11,798,216 $ 8,028 $ 11,831,085 Liabilities Derivative liabilities — 6,725 — 6,725 Total $ — $ 6,725 $ — $ 6,725 December 31, 2016 Fair Value Measurements Using Level 1 Level 2 Level 3 Total Assets Agency RMBS $ — $ 12,599,045 $ — $ 12,599,045 U.S. Treasuries 49,686 — — 49,686 Derivative assets — 142,556 — 142,556 Other investments — — 8,028 8,028 Total $ 49,686 $ 12,741,601 $ 8,028 $ 12,799,315 Liabilities FHLBC Advances — — — — Derivative liabilities — 6,051 — 6,051 Total $ — $ 6,051 $ — $ 6,051
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	The table below presents a reconciliation of changes in Other investments classified as Level 3 and measured at fair value on a recurring basis in the accompanying consolidated balance sheets for the three months ended June 30, 2017 and 2016 . Level 3 Fair Value Reconciliation (In thousands) Three and Six Months Ended June 30, Other investments 2017 2016 Beginning balance Level 3 assets $ 8,028 $ 8,028 Change in net unrealized gain (loss) — — Gross purchases — — Gross sales — — Net gain (loss) on sales — — Transfers into (out of) Level 3 — — Ending balance Level 3 assets $ 8,028 $ 8,028 The fair value of our net investment in a real estate asset is primarily derived internally, and is based on inputs observed from sales transactions of similar assets. We also rely on available industry information about capitalization rates and expected trends in rents and occupancy in determining estimates of the fair value of real estate. The significant unobservable input used in the fair value measurement of our net investment in real estate is the capitalization rate, which the Company estimated to be between 4.0% and 4.9% at June 30, 2017 and December 31, 2016 .

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Schedule Of Computation Of Basic And Diluted Earnings Per Share	Components of the computation of basic and diluted earnings per share ("EPS") are as follows (in thousands except per share amounts): Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Net income (loss) $ 50,225 $ 56,210 $ 84,245 $ 117,541 Less dividends on preferred shares (5,203 ) (5,203 ) (10,406 ) (10,406 ) Net income (loss) available to common stockholders 45,022 51,007 73,839 107,135 Less dividends paid: Common shares (37,700 ) (37,587 ) (75,394 ) (76,713 ) Unvested shares (232 ) (262 ) (465 ) (534 ) Undistributed earnings (loss) 7,090 13,158 (2,020 ) 29,888 Basic weighted-average shares outstanding: Common shares 150,800 150,405 150,691 150,591 Basic earnings (loss) per common share: Distributed earnings $ 0.25 $ 0.25 $ 0.50 $ 0.51 Undistributed earnings (loss) 0.05 0.09 (0.01 ) 0.20 Basic earnings (loss) per common share $ 0.30 $ 0.34 $ 0.49 $ 0.71 Diluted weighted-average shares outstanding: Common shares 150,800 150,405 150,691 150,591 Net effect of dilutive stock options (1) — — — — 150,800 150,405 150,691 150,591 Diluted earnings (loss) per common share: Distributed earnings $ 0.25 $ 0.25 $ 0.50 $ 0.51 Undistributed earnings 0.05 0.09 (0.01 ) 0.20 Diluted earnings (loss) per common share $ 0.30 $ 0.34 $ 0.49 $ 0.71 __________________ (1) For the three and six months ended June 30, 2017 and 2016 , the Company had no stock options outstanding.

Organization (Details)

Organization (Details) - $ / shares	Jun. 30, 2017	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Series A Cumulative Redeemable Preferred Stock, liquidation preference per share	$ 25	$ 25

Investments in Securities (Deta

Investments in Securities (Details)	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Available-for-sale Securities [Abstract]
Weighted average coupon on Agency RMBS	3.46%	3.37%
U.S. Treasury coupon interest rate	0.63%	0.63%
Debt Instrument, Maturity Date	30 years

Investments in Securities (Avai

Investments in Securities (Available-for-sale securities by GSE Agency and Coupon) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	$ (34,384)	$ (140,909)
Gross unrealized gains	55,158	46,906
Fair value	11,730,537	12,648,731
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	9,230,227	9,806,291
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(22,952)	(84,451)
Gross unrealized gains	42,994	38,193
Fair value	9,250,269	9,760,033
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] | Fixed Rate Residential Mortgage [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	8,986,881	9,505,262
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(21,649)	(81,783)
Gross unrealized gains	41,581	36,622
Fair value	9,006,813	9,460,101
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] | Adjustable Rate Residential Mortgage [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	243,346	301,029
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(1,303)	(2,668)
Gross unrealized gains	1,413	1,571
Fair value	243,456	299,932
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	2,422,503	2,850,245
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(11,238)	(56,138)
Gross unrealized gains	11,763	8,265
Fair value	2,423,028	2,802,372
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] | Fixed Rate Residential Mortgage [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	2,355,189	2,799,604
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(11,091)	(55,624)
Gross unrealized gains	11,281	7,659
Fair value	2,355,379	2,751,639
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] | Adjustable Rate Residential Mortgage [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	67,314	50,641
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(147)	(514)
Gross unrealized gains	482	606
Fair value	67,649	50,733
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	32,049	36,246
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(51)	(54)
Gross unrealized gains	401	448
Fair value	32,399	36,640
Government National Mortgage Association Certificates and Obligations (GNMA) [Member] | Fixed Rate Residential Mortgage [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,745	1,856
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(51)	(54)
Gross unrealized gains	0	0
Fair value	1,694	1,802
Government National Mortgage Association Certificates and Obligations (GNMA) [Member] | Adjustable Rate Residential Mortgage [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	30,304	34,390
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Gross unrealized gains	401	448
Fair value	30,705	34,838
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	24,984	49,952
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(143)	(266)
Gross unrealized gains	0	0
Fair value	24,841	49,686
Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	11,709,763	12,742,734
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(34,384)	(140,909)
Gross unrealized gains	55,158	46,906
Fair value	$ 11,730,537	$ 12,648,731

Investments in Securities (Av29

Investments in Securities (Available for sale, Continuous Unrealized Loss) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 4,711,452	$ 9,264,265
Unrealized loss on investments, owned less than 12 months	(34,384)	(140,909)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Unrealized loss on investments, owned more than 12 months	0	0
Fair value of investments in unrealized loss position	4,711,452	9,264,265
Available for sale securities, continuous unrealized loss	$ (34,384)	$ (140,909)

Investments in Securities (Av30

Investments in Securities (Available-for-sale securities by remaining maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value
Less than one year	$ 24,841	$ 0
Greater than one year through five years	6,877,266	3,765,037
Greater than five years through ten years	4,828,430	8,864,309
Greater than ten years	0	19,385
Total	11,730,537	12,648,731
Amortized Cost
Less than one year	24,984	0
Greater than one year through five years	6,849,276	3,744,614
Greater than five years through ten years	4,835,503	8,978,537
Greater than ten years	0	19,583
Total	$ 11,709,763	$ 12,742,734

Investments in Securities (Summ

Investments in Securities (Summary of Net Gain (loss) from the Sale of Available-for-Sale Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Available-for-sale investments, at cost	$ 1,265,490	$ 5,408,055	$ 4,863,982	$ 6,805,243
Proceeds from sale of available-for-sale investments	1,245,659	5,444,414
Proceeds from sale of available-for-sale investments			4,778,107	6,842,804
Net realized gain (loss) on sale of available-for-sale investments	(19,831)	36,359	(85,875)	37,561
Gross gain on sale of available-for-sale investments	2,270	36,743	10,873	42,126
Gross (loss) on sale of available-for-sale investments	$ (22,101)	$ (384)	$ (96,748)	$ (4,565)

Investments in Securities (Comp

Investments in Securities (Components of the Carrying Value of Available-for-Sale Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Principal balance	$ 11,341,310	$ 12,285,204
Unamortized premium	368,542	458,709
Unamortized discount	(89)	(1,179)
Gross unrealized gains	55,158	46,906
Gross unrealized losses	(34,384)	(140,909)
Fair value	11,730,537	12,648,731
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	(9,230,227)	(9,806,291)
Gross unrealized gains	42,994	38,193
Gross unrealized losses	(22,952)	(84,451)
Fair value	9,250,269	9,760,033
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	(2,422,503)	(2,850,245)
Gross unrealized gains	11,763	8,265
Gross unrealized losses	(11,238)	(56,138)
Fair value	2,423,028	2,802,372
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	(32,049)	(36,246)
Gross unrealized gains	401	448
Gross unrealized losses	(51)	(54)
Fair value	32,399	36,640
Total Agency RMBS [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	(11,684,779)	(12,692,782)
Gross unrealized gains	55,158	46,906
Gross unrealized losses	(34,241)	(140,643)
Fair value	11,705,696	12,599,045
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	(24,984)	(49,952)
Gross unrealized gains	0	0
Gross unrealized losses	(143)	(266)
Fair value	24,841	49,686
Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	(11,709,763)	(12,742,734)
Gross unrealized gains	55,158	46,906
Gross unrealized losses	(34,384)	(140,909)
Fair value	11,730,537	12,648,731
Fixed Rate Residential Mortgage [Member] | Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	(8,986,881)	(9,505,262)
Gross unrealized gains	41,581	36,622
Gross unrealized losses	(21,649)	(81,783)
Fair value	9,006,813	9,460,101
Fixed Rate Residential Mortgage [Member] | Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	(2,355,189)	(2,799,604)
Gross unrealized gains	11,281	7,659
Gross unrealized losses	(11,091)	(55,624)
Fair value	2,355,379	2,751,639
Fixed Rate Residential Mortgage [Member] | Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	(1,745)	(1,856)
Gross unrealized gains	0	0
Gross unrealized losses	(51)	(54)
Fair value	1,694	1,802
Adjustable Rate Residential Mortgage [Member] | Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	(243,346)	(301,029)
Gross unrealized gains	1,413	1,571
Gross unrealized losses	(1,303)	(2,668)
Fair value	243,456	299,932
Adjustable Rate Residential Mortgage [Member] | Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	(67,314)	(50,641)
Gross unrealized gains	482	606
Gross unrealized losses	(147)	(514)
Fair value	67,649	50,733
Adjustable Rate Residential Mortgage [Member] | Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	(30,304)	(34,390)
Gross unrealized gains	401	448
Gross unrealized losses	0	0
Fair value	$ 30,705	$ 34,838

Derivative Instruments (Details

Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Derivative [Line Items]
Derivative, Collateral, Right to Reclaim Cash	$ 0		$ 0		$ 600	[1]
Securities Received as Collateral					33,000
Derivative, Collateral, Obligation to Return Cash					90,800
Average notional on TBA derivatives	1,700,000	$ 1,100,000	1,600,000	$ 1,300,000
Derivative, Average Notional Amount	9,000,000	$ 9,700,000	9,000,000	$ 9,900,000
SwapandCapNotional	$ 9,100,000		$ 9,100,000		$ 9,000,000
SwapandCapNotionalasPercentageofRepoBorrowings	97.00%		97.00%		92.00%
Interest Rate Swaps and Interest Rate Caps [Member]
Derivative [Line Items]
Trading Securities Pledged as Collateral	$ 58,100		$ 58,100		$ 72,500
Derivative Instruments [Member]
Derivative [Line Items]
Derivative, Collateral, Right to Reclaim Cash	64,400		64,400
Securities Received as Collateral	$ 9,100		$ 9,100
[1]	Derived from audited consolidated financial statements.

Derivative Instruments (Summary

Derivative Instruments (Summary Of Interest Rate Swap And Cap Contracts) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Derivative [Line Items]
Notional transactions - opened (terminated)	$ 100,000	$ 1,000,000
Interest Rate Swap and Cap, April 2017 [Member] | Terminated [Member]
Derivative [Line Items]
Notional transactions - opened (terminated)	500,000
Interest Rate Swap and Cap, April 2017 [Member] | Opened [Member]
Derivative [Line Items]
Notional transactions - opened (terminated)	500,000
Interest Rate Swap and Cap, May 2017 [Member] | Terminated [Member]
Derivative [Line Items]
Notional transactions - opened (terminated)	500,000
Interest Rate Swap and Cap, May 2017 [Member] | Opened [Member]
Derivative [Line Items]
Notional transactions - opened (terminated)	500,000
Interest Rate Swap and Cap, June 2017 [Member] | Opened [Member]
Derivative [Line Items]
Notional transactions - opened (terminated)	$ 100,000
Interest Rate Swap and Cap, January 2016 [Member] | Terminated [Member]
Derivative [Line Items]
Notional transactions - opened (terminated)		500,000
Interest Rate Swap and Cap, May 2016 [Member] | Terminated [Member]
Derivative [Line Items]
Notional transactions - opened (terminated)		2,200,000
Interest Rate Swap and Cap, May 2016 [Member] | Opened [Member]
Derivative [Line Items]
Notional transactions - opened (terminated)		$ 1,700,000

Derivative Instruments (Derivat

Derivative Instruments (Derivatives and Other Hedging Instrument Assets and Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Average notional on TBA derivatives	$ 1,700,000	$ 1,100,000	$ 1,600,000	$ 1,300,000
Derivative and other hedging instruments, assets, fair value	30,900		30,900		$ 67,523
Derivative and other hedging instruments, liabilities, fair value	(6,270)		(6,270)		(6,051)
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative and other hedging instruments, assets, fair value	64,513		64,513		80,608
Interest Rate Cap [Member]
Derivatives, Fair Value [Line Items]
Derivative and other hedging instruments, assets, fair value	27,731		27,731		42,532
TBA Derivatives [Member]
Derivatives, Fair Value [Line Items]
Derivative and other hedging instruments, assets, fair value	276		276		19,416
Derivative assets, at fair value [Member]
Derivatives, Fair Value [Line Items]
Derivative and other hedging instruments, assets, notional	8,305,600		8,305,600		11,367,000
Derivative and other hedging instruments, assets, fair value	92,520		92,520		142,556
Derivative assets, at fair value [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative and other hedging instruments, assets, notional	5,550,000		5,550,000		6,450,000
Derivative assets, at fair value [Member] | Interest Rate Cap [Member]
Derivatives, Fair Value [Line Items]
Derivative and other hedging instruments, assets, notional	2,500,000		2,500,000		2,500,000
Derivative assets, at fair value [Member] | TBA Derivatives [Member]
Derivatives, Fair Value [Line Items]
Derivative and other hedging instruments, assets, notional	255,600		255,600		2,417,000
Derivative liabilities, at fair value [Member]
Derivatives, Fair Value [Line Items]
Derivative and other hedging instruments, liabilities, notional	2,486,850		2,486,850		1,870,000
Derivative and other hedging instruments, liabilities, fair value	(6,725)		(6,725)		(6,051)
Derivative liabilities, at fair value [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative and other hedging instruments, liabilities, notional	1,000,000		1,000,000		0
Derivative and other hedging instruments, liabilities, fair value	(883)		(883)		0
Derivative liabilities, at fair value [Member] | Interest Rate Cap [Member]
Derivatives, Fair Value [Line Items]
Derivative and other hedging instruments, liabilities, notional	0		0		0
Derivative and other hedging instruments, liabilities, fair value	0		0		0
Derivative liabilities, at fair value [Member] | TBA Derivatives [Member]
Derivatives, Fair Value [Line Items]
Derivative and other hedging instruments, liabilities, notional	1,486,850		1,486,850		1,870,000
Derivative and other hedging instruments, liabilities, fair value	$ (5,842)		$ (5,842)		$ (6,051)

Derivative Instruments (Amount

Derivative Instruments (Amount recognized in income on derivatives) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Swap and cap interest expense	$ (8,434)	$ (14,779)	$ (16,761)	$ (33,177)
Net realized and unrealized gain (loss) on derivative instruments	(18,324)	(44,535)	(19,336)	(185,059)
Net gain (loss) on derivative instruments	$ (26,758)	$ (59,314)	$ (36,097)	$ (218,236)

Repurchase Agreements and FHL37

Repurchase Agreements and FHLB Advances (Details) $ in Thousands		Jun. 30, 2017USD ($)d	Dec. 31, 2016USD ($)d
Banking and Thrift [Abstract]
Outstanding repurchase agreements		$ 9,370,845	$ 9,691,544
Interest accrued thereon		$ 17,649	$ 16,170
Weighted average borrowing rate		1.23%	0.89%
Weighted-average remaining maturity (in days) | d		79.9	53.3
Fair value of pledged collateral(1)	[1]	$ 9,798,063	$ 10,198,641
Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets		2.20%	2.60%
Number Of Repurchase Agreements exceeding 10% of Stockholders' Equity		0	0
[1]	Collateral for repo borrowings consists of Agency RMBS and U.S. Treasuries.

Repurchase Agreements and FHL38

Repurchase Agreements and FHLB Advances Remaining contractual maturity of the agreements (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total remaining contractual maturity of repo borrowings	$ 9,370,845	$ 9,691,544
Up to 30 days [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total remaining contractual maturity of repo borrowings	3,399,706	4,113,286
30-90 days [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total remaining contractual maturity of repo borrowings	3,114,492	3,694,937
Greater than 90 days [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total remaining contractual maturity of repo borrowings	2,856,647	1,883,321
Agency RMBS [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total remaining contractual maturity of repo borrowings	9,370,845	9,691,544
Agency RMBS [Member] | Up to 30 days [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total remaining contractual maturity of repo borrowings	3,399,706	4,113,286
Agency RMBS [Member] | 30-90 days [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total remaining contractual maturity of repo borrowings	3,114,492	3,694,937
Agency RMBS [Member] | Greater than 90 days [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total remaining contractual maturity of repo borrowings	$ 2,856,647	$ 1,883,321

Pledged Assets (Assets Pledged

Pledged Assets (Assets Pledged to Counterparties) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral to Counterparties, at Fair Value	$ 9,888,665	$ 10,308,717
Agency RMBS [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral to Counterparties, at Fair Value	9,834,904	10,233,165
US Treasury Securities [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral to Counterparties, at Fair Value	26,427	47,128
Accrued Interest on Pledged Securities [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral to Counterparties, at Fair Value	27,334	27,824
Cash [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral to Counterparties, at Fair Value	0	600
Repurchase Agreements [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral to Counterparties, at Fair Value	9,825,707	10,226,372
Repurchase Agreements [Member] | Agency RMBS [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral to Counterparties, at Fair Value	9,798,173	10,197,244
Repurchase Agreements [Member] | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral to Counterparties, at Fair Value	301	1,398
Repurchase Agreements [Member] | Accrued Interest on Pledged Securities [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral to Counterparties, at Fair Value	27,233	27,730
Repurchase Agreements [Member] | Cash [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral to Counterparties, at Fair Value	0	0
Derivative [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral to Counterparties, at Fair Value	60,968	79,728
Derivative [Member] | Agency RMBS [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral to Counterparties, at Fair Value	34,751	33,311
Derivative [Member] | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral to Counterparties, at Fair Value	26,126	45,730
Derivative [Member] | Accrued Interest on Pledged Securities [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral to Counterparties, at Fair Value	91	87
Derivative [Member] | Cash [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral to Counterparties, at Fair Value	0	600
Forward Settling Trades [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral to Counterparties, at Fair Value	1,990	2,617
Forward Settling Trades [Member] | Agency RMBS [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral to Counterparties, at Fair Value	1,980	2,610
Forward Settling Trades [Member] | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral to Counterparties, at Fair Value	0	0
Forward Settling Trades [Member] | Accrued Interest on Pledged Securities [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral to Counterparties, at Fair Value	10	7
Forward Settling Trades [Member] | Cash [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral to Counterparties, at Fair Value	$ 0	$ 0

Pledged Assets (Assets Pledge40

Pledged Assets (Assets Pledged from Counterparties ) (Details) - USD ($) $ in Thousands	Jun. 30, 2017		Dec. 31, 2016
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral from Counterparties, at Fair Value	$ 73,968		$ 127,541
Agency RMBS [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral from Counterparties, at Fair Value	0		4,309
US Treasury Securities [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral from Counterparties, at Fair Value	9,526		29,937
Accrued Interest on Pledged Securities [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral from Counterparties, at Fair Value	40		1,792
Cash [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral from Counterparties, at Fair Value	64,402		91,503
Repurchase Agreements [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral from Counterparties, at Fair Value	413		0
Repurchase Agreements [Member] | Agency RMBS [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral from Counterparties, at Fair Value	0		0
Repurchase Agreements [Member] | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral from Counterparties, at Fair Value	411		0
Repurchase Agreements [Member] | Accrued Interest on Pledged Securities [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral from Counterparties, at Fair Value	2		0
Repurchase Agreements [Member] | Cash [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral from Counterparties, at Fair Value	0		0
Derivative [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral from Counterparties, at Fair Value	73,555		125,520
Derivative [Member] | Agency RMBS [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral from Counterparties, at Fair Value	0		3,016
Derivative [Member] | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral from Counterparties, at Fair Value	9,115		29,937
Derivative [Member] | Accrued Interest on Pledged Securities [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral from Counterparties, at Fair Value	38		1,788
Derivative [Member] | Cash [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral from Counterparties, at Fair Value	64,402		90,779
Forward Settling Trades [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral from Counterparties, at Fair Value	0	[1]	2,021
Forward Settling Trades [Member] | Agency RMBS [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral from Counterparties, at Fair Value	0	[1]	1,293
Forward Settling Trades [Member] | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral from Counterparties, at Fair Value	0	[1]	0
Forward Settling Trades [Member] | Accrued Interest on Pledged Securities [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral from Counterparties, at Fair Value	0	[1]	4
Forward Settling Trades [Member] | Cash [Member]
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral from Counterparties, at Fair Value	$ 0	[1]	$ 724
[1]	{F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmExZGVmMDIyYzdkOTRhYWY5ODRjNjM3NmRkZTQzMWQyfFRleHRTZWxlY3Rpb246NUM2NDNGNEZBREM1OEFGMTVGMDE2NjM5NjE5MEY5NjIM}

Pledged Assets (Derivatives) (D

Pledged Assets (Derivatives) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral from Counterparties, at Fair Value	$ 73,968	$ 127,541
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	6,725
Derivative assets, at fair value	92,520	142,556	[1]
Interest Rate Derivative Liabilities, at Fair Value		6,051
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	92,520
Derivative Asset, Not Subject to Master Netting Arrangement	61,620	75,033
Derivative Liability, Not Subject to Master Netting Arrangement	455	0
DerivativeAssetSubjectToMasterNettingArrangement		67,523
Derivative Liability, Fair Value, Gross Liability	6,270	6,051
Derivative Asset, Current		80,608
Derivative Liability, Current		0
Interest rate cap, asset position		42,532
Interest rate cap, liability position		0
Assets_repledged_to_counterparties	1,600	2,700
NetDerivativeLiability		6,051
Derivative Asset, Fair Value, Gross Asset	30,900	67,523
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	883
Derivative Asset, Fair Value, Gross Asset	64,513	80,608
Interest Rate Cap [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0
Derivative Asset, Fair Value, Gross Asset	27,731	42,532
TBA Derivatives [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	5,842	6,051
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		19,416
Derivative Asset, Fair Value, Gross Asset	276	19,416
Residential Mortgage Backed Securities and US Treasury Securities [Member]
Derivative [Line Items]
Pledged Assets Separately Reported, Pledged as Collateral from Counterparties, at Fair Value	$ 9,500	$ 34,200
[1]	Derived from audited consolidated financial statements.

Pledged Assets (Offsetting Asse

Pledged Assets (Offsetting Assets) (Details) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Transfers and Servicing [Abstract]
Derivative Asset, Fair Value, Gross Asset		$ 30,900	$ 67,523
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		704	3,145
Fair Value of Securities Received as Collateral that Have Been Resold or Repledged	[1]	26,452	49,801
Derivative Asset, Fair Value, Amount Offset Against Collateral	[2]	3,744	14,577
Assets_repledged_to_counterparties		$ 1,600	$ 2,700
[1]	(1)Collateral consists of Agency RMBS, U.S. Treasuries and Cash and cash equivalents. Excess collateral pledged is not shown for financial reporting purposes.
[2]	(2)Net amount represents the net amount receivable from (in the case of assets) and payable to (in the case of liabilities) the counterparty in the event of default.

Pledged Assets (Offsetting Liab

Pledged Assets (Offsetting Liabilities) (Details) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Transfers and Servicing [Abstract]
Derivative Liability, Fair Value, Gross Liability		$ 6,270	$ 6,051
Derivative Liability, Fair Value of Collateral	[1]	5,566	2,906
Derivative Liability, Fair Value, Amount Offset Against Collateral	[2]	0	0
RepurchaseagreementsandFederalHomeLoanBankAdvances		9,370,845	9,691,544
Securities Sold under Agreements to Repurchase and FHLBC Advances, Not Offset, Policy Election Deduction		0	0
Securities Sold under Agreements to Repurchase and FHLBC Advances, Right to Reclaim Securities and Cash	[1]	9,370,845	9,691,544
Securities Sold under Agreements to Repurchase and FHLBC Advances, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	[2]	0	0
InstrumentsAvailableToOffsetDerivativeLiability		$ 704	$ 3,145
[1]	(1)Collateral consists of Agency RMBS, U.S. Treasuries and Cash and cash equivalents. Excess collateral pledged is not shown for financial reporting purposes.
[2]	(2)Net amount represents the net amount receivable from (in the case of assets) and payable to (in the case of liabilities) the counterparty in the event of default.

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Real Estate Investments, Net	$ 3.7	$ 3.8
unobservable input capitalization rate min	4.00%	4.00%
unobservable input capitalization rate max	4.90%	4.90%

Fair Value Measurements (Assets

Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Agency RMBS	$ 11,705,696	$ 12,599,045
U.S. Treasuries	24,841	49,686
Other Investments	8,028	8,028
Derivative assets, at fair value	92,520	142,556	[1]
Assets, Fair Value Disclosure, Recurring	11,831,085	12,799,315
Federal Home Loan Bank Borrowings, Fair Value Disclosure		0
Derivative liabilities, at fair value	6,725	6,051	[1]
Liabilities, Fair Value Disclosure, Recurring	6,725	6,051
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Agency RMBS	0	0
U.S. Treasuries	24,841	49,686
Other Investments	0	0
Derivative assets, at fair value	0	0
Assets, Fair Value Disclosure, Recurring	24,841	49,686
Federal Home Loan Bank Borrowings, Fair Value Disclosure		0
Derivative liabilities, at fair value	0	0
Liabilities, Fair Value Disclosure, Recurring	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Agency RMBS	11,705,696	12,599,045
U.S. Treasuries	0	0
Other Investments	0	0
Derivative assets, at fair value	92,520	142,556
Assets, Fair Value Disclosure, Recurring	11,798,216	12,741,601
Federal Home Loan Bank Borrowings, Fair Value Disclosure		0
Derivative liabilities, at fair value	6,725	6,051
Liabilities, Fair Value Disclosure, Recurring	6,725	6,051
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Agency RMBS	0	0
U.S. Treasuries	0	0
Other Investments	8,028	8,028
Derivative assets, at fair value	0	0
Assets, Fair Value Disclosure, Recurring	8,028	8,028
Federal Home Loan Bank Borrowings, Fair Value Disclosure		0
Derivative liabilities, at fair value	0	0
Liabilities, Fair Value Disclosure, Recurring	$ 0	$ 0
[1]	Derived from audited consolidated financial statements.

Fair Value Measurements (Level

Fair Value Measurements (Level 3 Fair Value Reconciliation) (Details) - Other Investments [Member] - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance Level 3 assets	$ 8,028	$ 8,028
Change in net unrealized gain (loss)	0	0
Gross purchases	0	0
Gross sales	0	0
Net gain (loss) on sales	0	0
Transfers into (out of) level 3	0	0
Ending balance Level 3 assets	$ 8,028	$ 8,028

Stockholders' Equity (Details)

Stockholders' Equity (Details) - USD ($)	6 Months Ended		12 Months Ended			20 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jul. 20, 2014	Jul. 21, 2014	Nov. 15, 2012
Equity Issuance [Line Items]
Common stock, shares authorized	500,000,000		500,000,000
Common stock, par value	$ 0.01		$ 0.01
Common Stock, Shares, Outstanding	151,731,146		151,434,917
Common Stock, Shares, Issued	151,731,146		151,434,917
Preferred Stock, Shares Authorized	50,000,000		50,000,000
Preferred Stock, Shares Outstanding	3,000,000		3,000,000
Preferred Stock, Par or Stated Value Per Share	$ 0.01		$ 0.01
Preferred Stock, Shares Issued	3,000,000		3,000,000
Preferred Stock A, Dividend Rate, Percentage 7.75%	7.75%
Series A Cumulative Redeemable Preferred Stock, liquidation preference per share	$ 25		$ 25
Series B Cumulative Redeemable Preferred Stock, shares issued	8,000,000		8,000,000
Series B Cumulative Redeemable Preferred Stock, shares outstanding	8,000,000		8,000,000
Preferred Stock B, Dividend Rate, Percentage 7.50%	7.50%
Stock Issued During Period, Shares, Dividend Reinvestment Plan	1,618
Stock Issued During Period, Value, Dividend Reinvestment Plan	$ 14,000
Stock Repurchase Program, Authorized Amount							$ 250,000,000	$ 250,000,000
Net proceeds (payments) from issuance and repurchase of common shares	$ 347,000	$ 5,515,000		$ 87,700,000	$ 1,500,000	$ 115,700,000
Number Of Common Stock Available To Sell Under Sales Agreement	155,500,000	155,501,682						134,300,000
Stock Repurchased and Retired During Period, Shares		673,166	673,166	10,559,493	172,549
Treasury Stock Acquired, Average Cost Per Share		$ 7.85	$ 7.85	$ 8.28	$ 8.88
Stock Repurchased and Retired During Period, Value			$ 5,300,000
Proceeds from (Repurchase of) Equity		$ 5,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	339,132	357,349
July 2014 Repurchase Plan [Member]
Equity Issuance [Line Items]
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 155,500,000
Dividend Reinvestment And Direct Stock Purchase Plan [Member]
Equity Issuance [Line Items]
Stock Available For Issuance During Period Shares Dividend Reinvestment Plan	4,100,000		4,054,000

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income		$ 50,225	$ 56,210	$ 84,245	$ 117,541
Less dividends on preferred shares		(5,203)	(5,203)	(10,406)	(10,406)
Net income (loss) available to common stockholders		45,022	51,007	73,839	107,135
Common shares		(37,700)	(37,587)	(75,394)	(76,713)
Unvested shares		(232)	(262)	(465)	(534)
Undistributed earnings (loss)		$ 7,090	$ 13,158	$ (2,020)	$ 29,888
Common shares		150,800,000	150,405,000	150,691,000	150,591,000
Distributed earnings		$ 0.25	$ 0.25	$ 0.50	$ 0.51
Undistributed earnings (loss)		0.05	0.09	(0.01)	0.20
Basic earnings (loss) per common share		$ 0.30	$ 0.34	$ 0.49	$ 0.71
Net effect of dilutive stock options (1)	[1]	0	0	0	0
Diluted weighted average shares outstanding		150,800,000	150,405,000	150,691,000	150,591,000
Distributed earnings		$ 0.25	$ 0.25	$ 0.50	$ 0.51
Undistributed earnings		0.05	0.09	(0.01)	0.20
Diluted earnings (loss) per common share		$ 0.30	$ 0.34	$ 0.49	$ 0.71
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number		0	0	0	0
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price		$ 30	$ 30	$ 30	$ 30
[1]	For the three and six months ended June 30, 2017 and 2016, the Company had no stock options outstanding.

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($)	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
RemainingLeaseTerm	84 months
Indemnification claims	$ 0	$ 0
Operating Leases, Future Minimum Payments Due	$ 2,297,000

Commitments and Contingencies L

Commitments and Contingencies Lease commitments table (Details) $ in Thousands	Jun. 30, 2017USD ($)
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 179
Operating Leases, Future Minimum Payments, Due in Two Years	363
Operating Leases, Future Minimum Payments, Due in Three Years	373
Operating Leases, Future Minimum Payments, Due in Four Years	383
Operating Leases, Future Minimum Payments, Due in Five Years	393
Operating Leases, Future Minimum Payments, Due Thereafter	606
Operating Leases, Future Minimum Payments Due	$ 2,297