Two Harbors Investment (TWO) 10-K 27 Feb 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2018	Feb. 22, 2019	Jun. 30, 2018
Entity Information [Line Items]
Entity Registrant Name	TWO HARBORS INVESTMENT CORP.
Entity Central Index Key	1,465,740
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		251,080,610
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 2.7
Entity Shell Company	false

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Available-for-sale securities, at fair value	$ 25,552,604	$ 21,220,819
Mortgage servicing rights, at fair value	1,993,440	1,086,717
Cash and cash equivalents	409,758	419,159
Restricted cash	688,006	635,836
Accrued interest receivable	86,589	68,309
Due from counterparties	154,626	842,303
Derivative assets, at fair value	319,981	309,918
Reverse repurchase agreements	761,815	0
Other assets	165,660	206,252
Total Assets	30,132,479	24,789,313
Liabilities
Repurchase agreements	23,133,476	19,451,207
Federal Home Loan Bank advances	865,024	1,215,024
Revolving credit facilities	310,000	20,000
Convertible senior notes	283,856	282,827
Derivative liabilities, at fair value	820,590	31,903
Due to counterparties	130,210	88,898
Dividends payable	135,551	12,552
Accrued interest payable	160,005	87,698
Other liabilities	39,278	27,780
Total Liabilities	25,877,990	21,217,889
Stockholders' Equity
Preferred stock, par value $0.01 per share; 50,000,000 shares authorized and 40,050,000 and 29,050,000 shares issued and outstanding, respectively ($1,001,250 and $726,250 liquidation preference, respectively)	977,501	702,537
Common stock, par value $0.01 per share; 450,000,000 shares authorized and 248,085,721 and 174,496,587 shares issued and outstanding, respectively	2,481	1,745
Additional paid-in capital	4,809,616	3,672,003
Accumulated other comprehensive income	110,817	334,813
Cumulative earnings	2,332,371	2,386,604
Cumulative distributions to stockholders	(3,978,297)	(3,526,278)
Total Stockholders’ Equity	4,254,489	3,571,424
Total Liabilities and Stockholders’ Equity	$ 30,132,479	$ 24,789,313

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Stockholders' Equity
Preferred stock par value per share (in usd per share)	$ 0.01	$ 0.01
Preferred shares authorized (in shares)	50,000,000	50,000,000
Preferred shares issued (in shares)	40,050,000	29,050,000
Shares issued and outstanding	40,050,000	29,050,000
Preferred stock liquidation preference	$ 1,001,250	$ 726,250
Common stock par value per share (in usd per share)	$ 0.01	$ 0.01
Common shares authorized (in shares)	450,000,000	450,000,000
Common shares issued (in shares)	248,085,721	174,496,587
Common shares outstanding (in shares)	248,085,721	174,496,587

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest income:
Available-for-sale securities	$ 847,325	$ 631,853	$ 414,050
Residential mortgage loans held-for-investment in securitization trusts	0	102,886	133,993
Other	22,707	10,350	27,037
Total interest income	870,032	745,089	575,080
Interest expense:
Repurchase agreements	469,437	210,430	88,850
Collateralized borrowings in securitization trusts	0	82,573	97,729
Federal Home Loan Bank advances	20,417	36,911	26,101
Revolving credit facilities	10,820	2,341	604
Convertible senior notes	18,997	17,933	0
Total interest expense	519,671	350,188	213,284
Net interest income	350,361	394,901	361,796
Other-than-temporary impairments:
Total other-than-temporary impairment losses	(470)	(789)	(1,822)
Other (loss) income:
Loss on investment securities	(341,312)	(34,695)	(107,374)
Servicing income	343,096	209,065	143,579
Loss on servicing asset	(69,033)	(91,033)	(83,531)
Gain (loss) on interest rate swap, cap and swaption agreements	16,043	(9,753)	45,371
(Loss) gain on other derivative instruments	(54,857)	(70,159)	99,379
Other income	3,037	30,141	9,964
Total other (loss) income	(103,026)	33,566	107,388
Expenses:
Management fees	30,272	40,472	39,261
Servicing expenses	61,136	35,289	32,119
Securitization deal costs	0	0	6,152
Other operating expenses	62,983	54,160	56,605
Acquisition transaction costs	86,703	0	0
Restructuring charges	8,238	0	2,990
Total expenses	249,332	129,921	137,127
(Loss) income from continuing operations before income taxes	(2,467)	297,757	330,235
Provision for (benefit from) income taxes	41,823	(10,482)	12,314
Net (loss) income from continuing operations	(44,290)	308,239	317,921
Income from discontinued operations, net of tax	0	44,146	35,357
Net (loss) income	(44,290)	352,385	353,278
Income from discontinued operations attributable to noncontrolling interest	0	3,814	0
Net (loss) income attributable to Two Harbors Investment Corp.	(44,290)	348,571	353,278
Dividends on preferred stock	65,395	25,122	0
Net (loss) income attributable to common stockholders	$ (109,685)	$ 323,449	$ 353,278
Basic earnings per weighted average common share:
Basic earnings from continuing operations per weighted average common share (in usd per share)	$ (0.53)	$ 1.62	$ 1.83
Basic earnings from discontinued operations per weighted average common share (in usd per share)	0	0.23	0.20
Basic earnings per weighted average common share (in usd per share)	(0.53)	1.85	2.03
Diluted earnings per weighted average common share:
Diluted earnings from continuing operations per weighted average common share (in usd per share)	(0.53)	1.60	1.83
Diluted earnings from discontinued operations per weighted average common share (in usd per share)	0	0.21	0.20
Diluted earnings per weighted average common share (in usd per share)	$ (0.53)	$ 1.81	$ 2.03
Weighted average basic common shares outstanding (in shares)	206,020,502	174,433,999	174,036,852
Weighted average diluted common shares outstanding (in shares)	206,020,502	188,133,341	174,036,852
Comprehensive (loss) income:
Net (loss) income	$ (44,290)	$ 352,385	$ 353,278
Other comprehensive (loss) income, net of tax:
Unrealized (loss) gain on available-for-sale securities	(233,914)	135,586	(159,834)
Other comprehensive (loss) income	(233,914)	135,586	(159,834)
Comprehensive (loss) income	(278,204)	487,971	193,444
Comprehensive income attributable to noncontrolling interest	0	3,814	0
Comprehensive (loss) income attributable to Two Harbors Investment Corp.	(278,204)	484,157	193,444
Dividends on preferred stock	65,395	25,122	0
Comprehensive (loss) income attributable to common stockholders	$ (343,599)	$ 459,035	$ 193,444

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Cumulative Earnings	Cumulative Distributions to Stockholders	Total Stockholders' Equity	Noncontrolling Interest	Preferred Stock	Preferred StockPreferred Stock	Preferred StockTotal Stockholders' Equity
Stockholders’ equity at beginning of period at Dec. 31, 2015		$ 0	$ 1,770	$ 3,707,288	$ 359,061	$ 1,684,755	$ (2,176,313)	$ 3,576,561
Noncontrolling interest at beginning of period at Dec. 31, 2015									$ 0
Total equity at beginning of period at Dec. 31, 2015	$ 3,576,561
Net income attributable to Two Harbors Investment Corp.	353,278					353,278		353,278
Income from discontinued operations attributable to noncontrolling interest	0
Net (loss) income	353,278
Other comprehensive income (loss) before reclassifications, net of tax	(58,804)				(58,804)			(58,804)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	101,030				101,030			101,030
Other comprehensive income (loss), net of tax	(159,834)				(159,834)			(159,834)
Issuance of stock, net of offering costs	502		1	501				502
Repurchase of common stock	(61,307)		(40)	(61,267)				(61,307)
Common dividends declared	(323,286)						(323,286)	(323,286)
Non-cash equity award compensation	15,197		8	15,189				15,197
Stockholders’ equity at end of period at Dec. 31, 2016		0	1,739	3,661,711	199,227	2,038,033	(2,499,599)	3,401,111
Noncontrolling interest at end of period at Dec. 31, 2016									0
Total equity at end of period at Dec. 31, 2016	3,401,111
Net income attributable to Two Harbors Investment Corp.	348,571					348,571		348,571
Income from discontinued operations attributable to noncontrolling interest	3,814								3,814
Net (loss) income	352,385
Other comprehensive income (loss) before reclassifications, net of tax	129,590				129,590			129,590
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	5,996				5,996			5,996
Other comprehensive income (loss), net of tax	135,586				135,586			135,586
Contribution of TH Commercial Holdings LLC to Granite Point Mortgage Trust Inc.	(181,875)			13,771	0			(13,771)	(195,646)
Acquisition of noncontrolling interests	11,361			(181)				181	11,542
Issuance of stock, net of offering costs	449		0	449				449		$ 702,537	$ 702,537	$ 702,537
Repurchase of common stock	0
Preferred dividends declared	(25,122)						(25,122)	(25,122)
Common dividends declared	(353,886)						(350,709)	(350,709)	(3,177)
Special dividend of Granite Point Mortgage Trust Inc. common stock	(824,322)		0	11,267			(650,848)	(639,581)	(184,741)
Non-cash equity award compensation	12,171		6	12,165				12,171
Stockholders’ equity at end of period at Dec. 31, 2017	3,571,424	702,537	1,745	3,672,003	334,813	2,386,604	(3,526,278)	3,571,424
Noncontrolling interest at end of period at Dec. 31, 2017									0
Total equity at end of period at Dec. 31, 2017	3,571,424
Cumulative effect of adoption of new accounting principles	0			25	9,918	(9,943)
Stockholders' equity at beginning of period, adjusted balance at Dec. 31, 2017	3,571,424	702,537	1,745	3,672,028	344,731	2,376,661	(3,526,278)	3,571,424	0
Net income attributable to Two Harbors Investment Corp.	(44,290)					(44,290)		(44,290)
Income from discontinued operations attributable to noncontrolling interest	0
Net (loss) income	(44,290)
Other comprehensive income (loss) before reclassifications, net of tax	(488,253)				(488,253)			(488,253)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	254,339				254,339			254,339
Other comprehensive income (loss), net of tax	(233,914)				(233,914)			(233,914)
Acquisition of CYS Investments, Inc.	1,400,064		726	1,124,388				1,400,064			274,950
Issuance of stock, net of offering costs	215		0	215				215		$ 14	$ 14	$ 14
Repurchase of common stock	0
Preferred dividends declared	(65,395)						(65,395)	(65,395)
Common dividends declared	(386,624)						(386,624)	(386,624)
Non-cash equity award compensation	12,995		10	12,985				12,995
Stockholders’ equity at end of period at Dec. 31, 2018	4,254,489	$ 977,501	$ 2,481	$ 4,809,616	$ 110,817	$ 2,332,371	$ (3,978,297)	$ 4,254,489
Noncontrolling interest at end of period at Dec. 31, 2018									$ 0
Total equity at end of period at Dec. 31, 2018	$ 4,254,489

CONSOLIDATED STATEMENTS OF ST_2

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Tax benefit from (expense on) other comprehensive income before reclassifications	$ 14,890	$ (45,157)	$ 20,435
Tax benefit from (expense on) on amounts reclassified from accumulated other comprehensive income	0	2,722	6,373
Tax benefit from (expense on) other comprehensive income	$ 14,890	$ (42,435)	$ 26,808

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows From Operating Activities:
Net (loss) income from continuing operations	$ (44,290)	$ 308,239	$ 317,921
Adjustments to reconcile net (loss) income from continuing operations to net cash provided by operating activities:
Amortization of premiums and discounts on investment securities, net	93,830	67,651	42,888
Amortization of deferred debt issuance costs on convertible senior notes	1,029	714	0
Other-than-temporary impairment losses	470	789	1,822
Realized and unrealized losses on investment securities	344,468	35,401	107,374
Loss on servicing asset	69,033	91,033	83,531
(Gain) loss on residential mortgage loans held-for-investment and collateralized borrowings in securitization trusts	0	(22,683)	11,834
Realized and unrealized losses (gains) on interest rate swaps, caps and swaptions	33,174	930	(66,444)
Unrealized loss (gain) on other derivative instruments	23,489	50,099	(37,463)
Equity based compensation	12,995	11,330	15,197
Excess consideration in the acquisition of CYS Investments, Inc.	77,602	0	0
Net change in assets and liabilities:
Decrease (increase) in accrued interest receivable	12,366	(24,689)	(10,603)
Decrease (increase) in deferred income taxes, net	41,988	(11,030)	13,766
Increase in accrued interest payable	44,820	67,118	10,200
Increase (decrease) in other, net	(8,104)	(229)	(270,513)
Net cash provided by operating activities from discontinued operations	0	32,108	20,169
Net cash provided by operating activities	702,870	606,781	239,679
Cash Flows From Investing Activities:
Purchases of available-for-sale securities	(12,621,282)	(18,232,105)	(21,310,083)
Proceeds from sales of available-for-sale securities	15,202,406	8,708,941	14,404,458
Principal payments on available-for-sale securities	2,434,071	1,553,051	1,276,159
Purchases of mortgage servicing rights, net of purchase price adjustments	(976,393)	(484,261)	(317,709)
Proceeds from sales of mortgage servicing rights	637	355	40,137
(Purchases) short sales of derivative instruments, net	(83,887)	(103,175)	(19,240)
Proceeds from sales and settlement (payments for termination and settlement) of derivative instruments, net	354,822	85,811	76,040
Proceeds from reverse repurchase agreements	4,085,127	0	0
Repayments of reverse repurchase agreements	(4,085,482)	0	0
Proceeds from sales of beneficial interests in securitization trusts	0	190,160	0
Proceeds from repayment of residential mortgage loans held-for-investment in securitization trusts	0	332,085	913,894
Net cash paid for the acquisition of CYS Investments, Inc.	(13,552)	0	0
Increase (decrease) in due to counterparties, net	449,274	(805,158)	34,665
Increase (decrease) in other, net	44,257	83,976	(11,206)
Net cash used in investing activities from discontinued operations	0	(813,939)	(757,393)
Net cash provided by (used in) investing activities	4,789,998	(9,484,259)	(5,670,278)
Cash Flows From Financing Activities:
Proceeds from repurchase agreements	151,887,922	139,559,059	111,505,422
Principal payments on repurchase agreements	(156,949,180)	(128,973,036)	(107,589,163)
Proceeds from issuance of collateralized borrowings in securitization trusts	0	0	1,877,399
Principal payments on collateralized borrowings in securitization trusts	0	(328,978)	(832,405)
Proceeds from Federal Home Loan Bank advances	0	0	215,000
Principal payments on Federal Home Loan Bank advances	(350,000)	(2,784,976)	0
Proceeds from revolving credit facilities	397,400	123,000	70,000
Principal payments on revolving credit facilities	(107,400)	(173,000)	0
Proceeds from convertible senior notes	0	282,113	0
Proceeds from issuance of preferred stock, net of offering costs	(36)	702,537	0
Proceeds from issuance of common stock, net of offering costs	215	449	502
Repurchase of common stock	0	0	(61,307)
Dividends paid on preferred stock	(58,394)	(13,173)	0
Dividends paid on common stock	(270,626)	(422,885)	(331,865)
Net cash provided by financing activities from discontinued operations	0	1,146,168	391,818
Net cash (used in) provided by financing activities	(5,450,099)	9,117,278	5,245,401
Net increase (decrease) in cash, cash equivalents and restricted cash	42,769	239,800	(185,198)
Cash, cash equivalents and restricted cash of continuing operations at beginning of period	1,054,995	758,916	944,055
Cash, cash equivalents and restricted cash of discontinued operations at beginning of period		0	56,279
Cash, cash equivalents and restricted cash at beginning of period	1,054,995	815,195	1,000,393
Cash, cash equivalents and restricted cash at end of period	1,097,764	1,054,995	815,195
Supplemental Disclosure of Cash Flow Information:
Cash paid for interest	419,878	227,518	116,147
Cash paid (received) for taxes	397	(856)	(5,146)
Acquisition of the assets and liabilities of CYS Investments, Inc.
Available-for-sale securities	10,034,557	0	0
Cash and cash equivalents	386	0	0
Restricted cash	1,062	0	0
Accrued interest receivable	30,646	0	0
Reverse repurchase agreements	761,460	0	0
Other assets	11,977	0	0
Repurchase agreements	(8,743,527)	0	0
Derivative liabilities, net	(451,026)	0	0
Due to counterparties, net	(279,715)	0	0
Accrued interest payable	(27,487)	0	0
Other liabilities	(821)	0	0
Deconsolidation of the assets and liabilities of variable interest entities
Recognition of beneficial interests in securitization trusts	0	59,826	0
Distribution of TH Commercial Holdings LLC to Granite Point Mortgage Trust Inc. in exchange for common shares	0	651,000	0
Distribution of Granite Point Mortgage Trust Inc. common stock	0	650,848	0
Transfers of residential mortgage loans held-for-sale to residential mortgage loans held-for-investment in securitization trusts	0	0	(1,031,226)
Cumulative-effect adjustment for adoption of new accounting principle	9,918	0	0
Dividends declared but not paid at end of period	135,551	12,552	83,437
Residential mortgage loans held-for-investment in securitization trusts
Deconsolidation of the assets and liabilities of variable interest entities
Deconsolidation of assets in securitization trusts	0	2,894,507	0
Accrued interest receivable
Deconsolidation of the assets and liabilities of variable interest entities
Deconsolidation of assets in securitization trusts	0	15,386	0
Collateralized borrowings in securitization trusts
Deconsolidation of the assets and liabilities of variable interest entities
Deconsolidation of liabilities in securitization trusts	0	2,920,970	0
Accrued interest payable
Deconsolidation of the assets and liabilities of variable interest entities
Deconsolidation of liabilities in securitization trusts	0	8,271	0
Accrued expenses and other liabilities
Deconsolidation of the assets and liabilities of variable interest entities
Deconsolidation of liabilities in securitization trusts	0	10,826	0
Preferred Stock
Acquisition of the assets and liabilities of CYS Investments, Inc.
Issuance of stock in connection with the acquisition of CYS Investments, Inc.	275,000	0	0
Common Stock Including Additional Paid in Capital
Acquisition of the assets and liabilities of CYS Investments, Inc.
Issuance of stock in connection with the acquisition of CYS Investments, Inc.	$ 1,125,114	$ 0	$ 0

Organization and Operations

Organization and Operations	12 Months Ended
	Dec. 31, 2018
Organization and Operations [Abstract]
Organization and Operations	Organization and Operations Two Harbors Investment Corp., or the Company, is a Maryland corporation investing in, financing and managing Agency residential mortgage-backed securities, or Agency RMBS, non-Agency securities, mortgage servicing rights, or MSR, and other financial assets. The Company’s Chief Investment Officer manages the investment portfolio as a whole and resources are allocated and financial performance is assessed on a consolidated basis. The Company is externally managed and advised by PRCM Advisers LLC, or PRCM Advisers, which is a subsidiary of Pine River Capital Management L.P., or Pine River. The Company’s common stock is listed on the NYSE under the symbol “TWO”. The Company was incorporated on May 21, 2009, and commenced operations as a publicly traded company on October 28, 2009, upon completion of a merger with Capitol Acquisition Corp., or Capitol, which became a wholly owned indirect subsidiary of the Company as a result of the merger. The Company has elected to be treated as a real estate investment trust, or REIT, as defined under the Internal Revenue Code of 1986, as amended, or the Code, for U.S. federal income tax purposes. As long as the Company continues to comply with a number of requirements under federal tax law and maintains its qualification as a REIT, the Company generally will not be subject to U.S. federal income taxes to the extent that the Company distributes its taxable income to its stockholders on an annual basis and does not engage in prohibited transactions. However, certain activities that the Company may perform may cause it to earn income which will not be qualifying income for REIT purposes. The Company has designated certain of its subsidiaries as taxable REIT subsidiaries, or TRSs, as defined in the Code, to engage in such activities. On June 28, 2017, the Company completed the contribution of its portfolio of commercial real estate assets to Granite Point Mortgage Trust Inc., or Granite Point, a newly formed Maryland corporation intended to qualify as a REIT, externally managed and advised by Pine River, and focused on directly originating, investing in and managing senior floating-rate commercial mortgage loans and other debt and debt-like commercial real estate investments. The Company contributed its equity interests in its wholly owned subsidiary, TH Commercial Holdings LLC, to Granite Point and, in exchange for its contribution, received approximately 33.1 million shares of common stock of Granite Point, which represented approximately 76.5% of the outstanding stock of Granite Point upon completion of the initial public offering, or IPO, of its common stock on June 28, 2017. On November 1, 2017, the Company distributed, on a pro rata basis, the 33.1 million shares of Granite Point common stock that it acquired in connection with the contribution to stockholders holding shares of Two Harbors common stock outstanding as of the close of business on October 20, 2017. On April 26, 2018, the Company announced that it had entered into a definitive merger agreement pursuant to which the Company would acquire CYS Investments, Inc., or CYS, a Maryland corporation investing in primarily Agency RMBS and treated as a REIT for U.S. federal income tax purposes. The transaction was approved by the stockholders of both the Company and CYS on July 27, 2018, and the merger was completed on July 31, 2018, at which time CYS became a wholly owned subsidiary of the Company. In exchange for all of the shares of CYS common stock outstanding immediately prior to the effective time of the merger, the Company issued approximately 72.6 million new shares of common stock, as well as aggregate cash consideration of $15.0 million , to CYS common stockholders. In addition, the Company issued 3 million shares of newly classified Series D cumulative redeemable preferred stock and 8 million

Basis of Presentation and Signi

Basis of Presentation and Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Basis of Presentation and Significant Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	Basis of Presentation and Significant Accounting Policies Consolidation and Basis of Presentation The accompanying consolidated financial statements include the accounts of all subsidiaries; inter-company accounts and transactions have been eliminated. The accounting and reporting policies of the Company conform to U.S. generally accepted accounting principles, or U.S. GAAP. Certain prior period amounts have been reclassified to conform to the current period presentation. All per share amounts, common shares outstanding and restricted shares for all prior periods presented have been adjusted on a retroactive basis to reflect the Company’s one-for-two reverse stock split effected on November 1, 2017 (refer to Note 16 - Stockholders’ Equity for additional information). Due to its controlling ownership interest in Granite Point through November 1, 2017, the Company consolidated Granite Point on its financial statements. Effective November 1, 2017 (the date the 33.1 million shares of Granite Point common stock were distributed to the Company’s common stockholders), the Company no longer had a controlling interest in Granite Point and, therefore, deconsolidated Granite Point and its subsidiaries from its financial statements and reclassified all of Granite Point’s prior period assets, liabilities and results of operations to discontinued operations. The Company retains debt securities and excess servicing rights purchased from securitization trusts sponsored by either third parties or the Company’s subsidiaries. The securitization trusts are considered variable interest entities, or VIEs, for financial reporting purposes and, thus, are reviewed for consolidation under the applicable consolidation guidance. Whenever the Company has both the power to direct the activities of a trust that most significantly impact the entities’ performance, and the obligation to absorb losses or the right to receive benefits of the entities that could be significant, the Company consolidates the trust. During the majority of 2017, the Company retained the most subordinate security in each of the securitization trusts, which gave the Company the power to direct the activities of the trusts that most significantly impact the trusts’ performance and the obligation to absorb losses or the right to receive benefits of the securitization trusts that could be significant. As a result, the Company consolidated all of the securitization trusts, including the underlying mortgage loans held by the trusts (residential mortgage loans held-for-investment) and the associated debt (collateralized borrowings), on its consolidated balance sheet. During the fourth quarter of 2017, the Company sold all of the retained subordinated securities thereby removing the Company’s power to direct the activities of the trusts and the obligation to absorb losses or the right to receive benefits of the securitization trusts. As a result, the securitization trusts are no longer consolidated on the Company’s consolidated balance sheet and the remaining retained securities are included within non-Agency available-for-sale, or AFS, securities. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make a number of significant estimates. These include estimates of fair value of certain assets and liabilities, amount and timing of credit losses, prepayment rates, the period of time during which the Company anticipates an increase in the fair values of real estate securities sufficient to recover unrealized losses in those securities, and other estimates that affect the reported amounts of certain assets and liabilities as of the date of the consolidated financial statements and the reported amounts of certain revenues and expenses during the reported period. It is likely that changes in these estimates ( e.g. , valuation changes due to supply and demand, credit performance, prepayments, interest rates, or other reasons) will occur in the near term. The Company’s estimates are inherently subjective in nature and actual results could differ from its estimates and the differences may be material. Significant Accounting Policies Available-for-Sale Securities, at Fair Value The Company invests primarily in mortgage pass-through certificates, collateralized mortgage obligations and other residential mortgage-backed securities representing interests in or obligations backed by pools of mortgage loans (collectively “Agency RMBS”) issued by the Federal National Mortgage Association, or Fannie Mae, the Federal Home Loan Mortgage Corporation, or Freddie Mac, and the Government National Mortgage Association, or Ginnie Mae, or collectively, the government sponsored entities, or GSEs. The Company also invests in securities that are not issued by the GSEs, or non-Agency securities, and, from time to time, U.S. Treasuries. The Company classifies its Agency RMBS and non-Agency securities, excluding inverse interest-only Agency securities classified as derivatives for purposes of U.S. GAAP, as AFS, investments. Although the Company generally intends to hold most of its investment securities until maturity, it may, from time to time, sell any of its investment securities as part of its overall management of its portfolio. Accordingly, the Company classifies all of its securities as AFS, including its interest-only strips, which represent the Company’s right to receive a specified portion of the contractual interest flows of specific Agency or non-Agency securities. All assets classified as AFS, excluding Agency interest-only mortgage-backed securities, are reported at estimated fair value with unrealized gains and losses, excluding other than temporary impairments, included in accumulated other comprehensive income, on an after-tax basis. On July 1, 2015, the Company elected the fair value option for Agency interest-only securities acquired on or after such date. All Agency interest-only securities acquired on or after July 1, 2015 are carried at estimated fair value with changes in fair value, excluding other than temporary impairments, recorded as a component of loss on investment securities in the consolidated statements of comprehensive (loss) income . Fair value is determined under the guidance of Accounting Standards Codification (ASC) 820, Fair Value Measurements and Disclosures, or ASC 820. The Company determines the fair value of its RMBS that are issued or guaranteed as to principal and/or interest by a federally chartered corporation, such as Fannie Mae or Freddie Mac, or an agency of the U.S. government, such as Ginnie Mae (collectively, “Agency RMBS”), based upon prices obtained from third-party pricing providers or broker quotes received using the bid price, which are both deemed indicative of market activity. In determining the fair value of its non-Agency securities, management judgment is used to arrive at fair value that considers prices obtained from third-party pricing providers, broker quotes received and other applicable market data. If listed price data is not available or insufficient, then fair value is based upon internally developed models that are primarily based on observable market-based inputs but also include unobservable market data inputs. See Note 9 - Fair Value of these notes to the consolidated financial statements for details on fair value measurement. Investment securities transactions are recorded on the trade date. The cost basis for realized gains and losses on sales of investment securities are determined on the first-in, first-out, or FIFO, method. Interest income on securities is accrued based on the outstanding principal balance and their contractual terms. Premiums and discounts associated with Agency RMBS and non-Agency securities rated AA and higher at the time of purchase, are amortized into interest income over the life of such securities using the effective yield method. Adjustments to premium amortization are made for actual prepayment activity. The Company estimates prepayments for its Agency interest-only securities, which represent the Company’s right to receive a specified portion of the contractual interest flows of specific Agency securities. As a result, if prepayments increase (or are expected to increase), the Company will accelerate the rate of amortization on the premiums. Interest income on the non-Agency securities that were purchased at a discount to par value and were rated below AA at the time of purchase is recognized based on the security’s effective interest rate. The effective interest rate on these securities is based on the projected cash flows from each security, which are estimated based on the Company’s observation of current information and events and include assumptions related to interest rates, prepayment rates, and the timing and amount of credit losses. On at least a quarterly basis, the Company reviews and, if appropriate, makes adjustments to its cash flow projections based on input and analysis received from external sources, internal models, and its judgment about interest rates, prepayment rates, the timing and amount of credit losses, and other factors. Changes in cash flows from those originally projected, or from those estimated at the last evaluation, may result in a prospective change in the yield/interest income recognized on such securities. Actual maturities of the AFS securities are affected by the contractual lives of the associated mortgage collateral, periodic payments of principal, and prepayments of principal. Therefore actual maturities of AFS securities are generally shorter than stated contractual maturities. Stated contractual maturities are generally greater than ten years. Based on the projected cash flows from the Company’s non-Agency securities purchased at a discount to par value, a portion of the purchase discount may be designated as credit protection against future credit losses and, therefore, not accreted into interest income. The amount designated as credit discount may be adjusted over time, based on the actual performance of the security, its underlying collateral, actual and projected cash flow from such collateral, economic conditions, and other factors. If the performance of a security with a credit discount is more favorable than forecasted, a portion of the amount designated as credit discount may be accreted into interest income prospectively. Conversely, if the performance of a security with a credit discount is less favorable than forecasted, an impairment charge and write-down of such security to a new cost basis results. The Company evaluates its investment securities, on a quarterly basis, to assess whether a decline in the fair value of an AFS security below the Company’s amortized cost basis is an other-than-temporary impairment, or OTTI. The presence of OTTI is based upon a fair value decline below a security’s amortized cost basis and a corresponding adverse change in expected cash flows due to credit related factors as well as non-credit factors, such as changes in interest rates and market spreads. Impairment is considered other-than-temporary if an entity (i) intends to sell the security, (ii) will more likely than not be required to sell the security before it recovers in value, or (iii) does not expect to recover the security’s amortized cost basis, even if the entity does not intend to sell the security. Under these scenarios, the impairment is other-than-temporary and the full amount of impairment should be recognized currently in earnings and the cost basis of the investment security is adjusted. However, if an entity does not intend to sell the impaired debt security and it is more likely than not that it will not be required to sell before recovery, the OTTI is separated into (i) the estimated amount relating to credit loss, or credit component, and (ii) the amount relating to all other factors, or non-credit component. Only the estimated credit loss amount is recognized currently in earnings, with the remainder of the loss amount recognized in other comprehensive (loss) income . The difference between the new amortized cost basis and the cash flows expected to be collected is accreted as interest income in accordance with the effective interest method. Mortgage Servicing Rights, at Fair Value The Company’s MSR represent the right to service mortgage loans. The Company and its subsidiaries do not originate or directly service mortgage loans, and instead contract with appropriately licensed subservicers to handle substantially all servicing functions in the name of the subservicer for the loans underlying the Company’s MSR. However, as an owner and manager of MSR, the Company may be obligated to fund advances of principal and interest payments due to third-party owners of the loans, but not yet received from the individual borrowers. These advances are reported as servicing advances within the other assets line item on the consolidated balance sheets. MSR are reported at fair value on the consolidated balance sheets. Although MSR transactions are observable in the marketplace, the valuation includes unobservable market data inputs (prepayment speeds, delinquency levels and discount rates). Changes in the fair value of MSR as well as servicing fee income and servicing expenses are reported on the consolidated statements of comprehensive (loss) income . Cash and Cash Equivalents Cash and cash equivalents include cash held in bank accounts and cash held in money market funds on an overnight basis. Restricted Cash Restricted cash represents the Company’s cash held by counterparties as collateral against the Company’s securities, certain derivative instruments and/or repurchase agreements. Also included is the cash balance held pursuant to a letter of credit on the New York office lease. Cash held by counterparties as collateral, which resides in non-interest bearing accounts, is not available to the Company for general corporate purposes, but may be applied against amounts due to security, derivative or repurchase counterparties or returned to the Company when the collateral requirements are exceeded or, at the maturity of the derivative or repurchase agreement. Accrued Interest Receivable Accrued interest receivable represents interest that is due and payable to the Company. Cash interest is generally received within 30 days of recording the receivable. Due from/to Counterparties, net Due from counterparties includes cash held by counterparties for payment of principal and interest as well as cash held by counterparties as collateral against certain of the Company’s derivatives and/or repurchase agreements but represents excess capacity and deemed unrestricted and a receivable from the counterparty as of the balance sheet date. Due from counterparties also includes cash receivable from counterparties for sales of MSR pending final transfer and settlement. Due to counterparties includes cash payable by the Company upon settlement of trade positions as well as cash deposited to and held by the Company as collateral against certain of the Company’s derivatives and/or repurchase agreements but represents a payable to the counterparty as of the balance sheet date. Due to counterparties also includes purchase price holdbacks on MSR acquisitions for early prepayment or default provisions, collateral exceptions and other contractual terms. Derivative Financial Instruments, at Fair Value In accordance with ASC 815, Derivatives and Hedging, as amended and interpreted, or ASC 815, all derivative financial instruments, whether designated for hedging relationships or not, are recorded on the consolidated balance sheets as assets or liabilities and carried at fair value. At the inception of a derivative contract, the Company determines whether the instrument will be part of a qualifying hedge accounting relationship or whether the Company will account for the contract as a trading instrument. Due to the volatility of the credit markets and difficulty in effectively matching pricing or cash flows, the Company has elected to treat all current derivative contracts as trading instruments. Changes in fair value as well as the accrual and settlement of interest associated with derivatives accounted for as trading instruments are reported in the consolidated statements of comprehensive (loss) income as gain (loss) on interest rate swap, cap and swaption agreements or (loss) gain on other derivative instruments depending on the type of derivative instrument. The Company enters into interest rate derivative contracts for a variety of reasons, including minimizing fluctuations in earnings or market values on certain assets or liabilities that may be caused by changes in interest rates. The Company may, at times, enter into various forward contracts including short securities, Agency to-be-announced securities, or TBAs, options, futures, swaps, and caps. Due to the nature of these instruments, they may be in a receivable/asset position or a payable/liability position at the end of an accounting period. Amounts payable to and receivable from the same party under contracts may be offset as long as the following conditions are met: (a) each of the two parties owes the other determinable amounts; (b) the reporting party has the right to offset the amount owed with the amount owed by the other party; (c) the reporting party intends to offset; and (d) the right of offset is enforceable by law. If the aforementioned conditions are not met, amounts payable to and receivable from are presented by the Company on a gross basis in its consolidated balance sheets. The Company’s centrally cleared interest rate swaps require that the Company posts an “initial margin” amount determined by the clearing exchange, which is generally intended to be set at a level sufficient to protect the exchange from the interest rate swap’s maximum estimated single-day price movement. The Company also exchanges “variation margin” based upon daily changes in fair value, as measured by the exchange. As a result of amendments to rules governing certain central clearing activities, the exchange of variation margin is a settlement of the interest rate swap, as opposed to pledged collateral. Accordingly, beginning in the first quarter of 2018 and in subsequent periods, the Company accounts for the receipt or payment of variation margin on interest rate swaps as a direct reduction to the carrying value of the interest rate swap asset or liability. As of December 31, 2018 and December 31, 2017 , variation margin pledged or received is netted on a counterparty basis and classified within restricted cash, due from counterparties, or due to counterparties on the Company’s consolidated balance sheets. The Company has provided specific disclosure regarding the location and amounts of derivative instruments in the consolidated financial statements and how derivative instruments and related hedged items are accounted for. See Note 7 - Derivative Instruments and Hedging Activities of these notes to the consolidated financial statements. Reverse Repurchase Agreements The Company may borrow U.S. Treasury securities through reverse repurchase transactions under its master repurchase agreements to cover short sales. The Company accounts for these reverse repurchase agreements as securities borrowing transactions and records them at amortized cost, which approximates fair value due to their short-term nature, on its consolidated balance sheets. Commercial Real Estate Assets (of Discontinued Operations) Due to the Company’s controlling ownership interest in Granite Point through November 1, 2017, its financial condition and results of operations through such date reflect Granite Point’s commercial strategy, which includes as target assets first mortgages, mezzanine loans, B-notes and preferred equity. These commercial real estate assets have been reclassified to assets of discontinued operations on the consolidated balance sheets. Interest income on commercial real estate assets has been reclassified to income from discontinued operations on the consolidated statements of comprehensive (loss) income . The Company’s commercial real estate assets were reported at cost, net of any unamortized acquisition premiums or discounts, loan fees and origination costs as applicable, unless the assets were deemed impaired. No impairments were recorded while these loans were held by the Company. Interest income on commercial real estate assets was recognized at the loan coupon rate. Any premiums or discounts, loan fees and origination costs were amortized or accreted into interest income over the lives of the loans using the effective interest method. Loans were considered past due when they are 30 days past their contractual due date. Interest income recognition was suspended when loans are placed on nonaccrual status. Generally, commercial real estate loans were placed on nonaccrual status when delinquent for more than 60 days or when determined not to be probable of full collection. Interest accrued, but not collected, at the date loans were placed on nonaccrual is reversed and subsequently recognized only to the extent it was received in cash or until it qualified for return to accrual status. However, where there was doubt regarding the ultimate collectability of loan principal, all cash received was applied to reduce the carrying value of such loans. Commercial real estate loans were restored to accrual status only when contractually current or the collection of future payments was reasonably assured. Repurchase Agreements The Company finances certain of its investment securities and MSR through the use of repurchase agreements. These repurchase agreements are generally short-term debt, which expire within one year. As of December 31, 2018 , certain of the Company’s repurchase agreements had contractual terms of greater than one year, and were considered long-term debt. Borrowings under repurchase agreements generally bear interest rates of a specified margin over one-month LIBOR and are generally uncommitted. The repurchase agreements are treated as collateralized financing transactions and are carried at their contractual amounts, as specified in the respective agreements. Federal Home Loan Bank of Des Moines Advances and Stock Holdings The Company’s wholly owned subsidiary, TH Insurance Holdings Company LLC, or TH Insurance, is a member of the Federal Home Loan Bank of Des Moines, or the FHLB. As a member of the FHLB, TH Insurance has access to a variety of products and services offered by the FHLB, including secured advances. The Company’s secured advances from the FHLB may have both short-term and long-term maturities. The advances with less than five year terms generally bear interest rates of a spread over one- or three-month LIBOR and the advances with 20-year terms generally bear interest rates of or one- or three-month MOVR, or the FHLB member option variable-rate. FHLB advances are treated as secured financing transactions and are carried at their contractual amounts. As a condition to membership in the FHLB, the Company is required to purchase and hold a certain amount of FHLB stock, which is based, in part, upon the outstanding principal balance of advances from the FHLB. FHLB stock is considered a nonmarketable, long-term investment, is carried at cost and is subject to recoverability testing under applicable accounting standards. This stock can only be redeemed or sold at its par value, and only to the FHLB. Accordingly, when evaluating FHLB stock for impairment, the Company considers the ultimate recoverability of the par value rather than recognizing temporary declines in value. At its discretion, the FHLB may declare dividends on its stock. Revolving Credit Facilities To finance MSR, the Company enters into revolving credit facilities collateralized by pledged MSR. Borrowings under these revolving credit facilities that expire within one year are considered short-term debt. As of December 31, 2018 , the Company’s revolving credit facilities that had contractual terms of greater than one year were considered long-term debt. The Company’s revolving credit facilities generally bear interest rates of a specified margin over one-month LIBOR. Borrowings under revolving credit facilities are treated as collateralized financing transactions and are carried at contractual amounts, as specified in the respective agreements. Convertible Senior Notes Convertible senior notes include unsecured convertible debt that are carried at their unpaid principal balance, net of any unamortized deferred issuance costs, on the Company’s consolidated balance sheet. Interest on the notes is payable semiannually until such time the notes mature or are converted into shares of the Company’s common stock. Accrued Interest Payable Accrued interest payable represents interest that is due and payable to third parties. Interest is generally paid within 30 days to three months of recording the payable, based upon the Company’s remittance requirements. Deferred Tax Assets and Liabilities Income recognition for U.S. GAAP and tax differ in certain respects. These differences often reflect differing accounting treatments for tax and U.S. GAAP, such as accounting for discount and premium amortization, credit losses, asset impairments, recognition of certain operating expenses and certain valuation estimates. Some of these differences are temporary in nature and create timing mismatches between when taxable income is earned and the tax is paid versus when the earnings (losses) for U.S. GAAP purposes, or GAAP net (loss) income , are recognized and the tax provision is recorded. Some of these differences are permanent since certain income (or expense) may be recorded for tax purposes but not for U.S. GAAP purposes (or vice-versa). One such significant permanent difference is the Company’s ability as a REIT to deduct dividends paid to stockholders as an expense for tax purposes, but not for U.S. GAAP purposes. As a result of these temporary differences, the Company’s TRSs may recognize taxable income in periods prior or subsequent to when it recognizes income for U.S. GAAP purposes. When this occurs, the TRSs pay or defer the tax liability and establish deferred tax assets or deferred tax liabilities, respectively, for U.S. GAAP purposes. As the income is subsequently realized in future periods under U.S. GAAP, the deferred tax asset is recognized as an expense. Alternatively, as the TRSs realize the deferred taxable income, the deferred tax liability is recognized as a reduction to taxable income. The Company’s deferred tax assets and/or liabilities are generated solely by differences in GAAP net (loss) income and taxable income (loss) at our taxable subsidiaries. U.S. GAAP and tax differences in the REIT may create additional deferred tax assets and/or liabilities to the extent the Company does not distribute all of its taxable income. Income Taxes The Company has elected to be taxed as a REIT under the Code and the corresponding provisions of state law. To qualify as a REIT, the Company must distribute at least 90% of its annual REIT taxable income to stockholders (not including taxable income retained in its taxable subsidiaries) within the time frame set forth in the tax Code and the Company must also meet certain other requirements. In addition, because certain activities, if performed by the Company, may cause the Company to earn income which is not qualifying for the REIT gross income tests, the Company has formed TRSs, as defined in the Code, to engage in such activities. These TRSs’ activities are subject to income taxes as well as any REIT taxable income not distributed to stockholders. The Company assesses its tax positions for all open tax years and determines whether the Company has any material unrecognized liabilities in accordance with ASC 740, Income Taxes . The Company records these liabilities to the extent the Company deems them more likely than not to be incurred. The Company classifies interest and penalties on material uncertain tax positions as interest expense and operating expense, respectively, in its consolidated statements of comprehensive (loss) income . The SEC issued Staff Accounting Bulletin (“SAB 118”), which provides guidance on accounting for tax effects of the Tax Cuts and Jobs Act of 2017 (“TCJA”), which was signed into law on December 22, 2017. SAB 118 provided a measurement period that should not extend beyond one year from the TCJA enactment date for companies to complete the accounting under ASC 740. In accordance with SAB 118, a company must reflect the income tax effects of those aspects of the Act for which the accounting under ASC 740 is complete. To the extent that a company’s accounting for certain income tax effects of the TCJA were incomplete but it was able to determine a reasonable estimate, it was required to record a provisional estimate to be included in the financial statements. . If a company could not determine a provisional estimate to be included in the financial statements, it continued to apply ASC 740 on the basis of the provision of the tax laws that were in effect immediately before the enactment of the TCJA. The TCJA significantly revised the U.S. corporate income tax by, among other things, lowering the federal income tax rate applicable to corporations from 35% to 21% and repealing the corporate alternative minimum tax. In addition, the deduction of net interest expense is limited for all businesses; provided that certain businesses, including real estate businesses, may elect not to be subject to such limitations and instead to depreciate their real property related assets over longer depreciable lives. This limitation could adversely affect our TRSs. The Company recorded a provisional tax provision of $17.5 million in the 2017 financial statements, which was included as a component of income tax expense from continuing operations. This amount represents the remeasurement of federal net deferred tax assets resulting from the permanent reduction in the U.S. statutory corporate tax rate from 35% to 21% . The provisional amount was finalized in 2018 without any changes and there is no additional impact to the 2018 financial statements. Technical corrections or other amendments to the TCJA or administrative guidance interpreting the TCJA may be forthcoming at any time. While the Company does not anticipate a material effect on its operations, the Company will continue to analyze and monitor the application of the TCJA to its businesses, its peers and the economic environment. Other Comprehensive Income (Loss) Current period net unrealized gains and losses on AFS securities, excluding Agency interest-only securities, are reported as components of accumulated other comprehensive income on the consolidated statements of stockholders’ equity and in the consolidated statements of comprehensive (loss) income . Net unrealized gains and losses on securities held by our taxable subsidiaries that are reported in accumulated other comprehensive income are adjusted for the effects of taxation and may create deferred tax assets or liabilities. Earnings Per Share Basic and diluted (loss) earnings per share are computed by dividing net (loss) income attributable to common stockholders by the weighted average number of common shares and potential common shares outstanding during the period. For both basic and diluted per share calculations, potential common shares represents issued and unvested shares of restricted stock, which have full rights to the common stock dividend declarations of the Company. If the assumed conversion of convertible notes into common shares is dilutive, diluted (loss) earnings per share is adjusted by adding back the periodic interest expense (net of any tax effects) associated with dilutive convertible notes to net (loss) income attributable to common stockholders and adding the shares issued in an assumed conversion to the diluted weighted average share count. All per share amounts, common shares outstanding and restricted shares for all periods presented reflect the Company’s one-for-two reverse stock split effected on November 1, 2017 (refer to Note 16 - Stockholders’ Equity for additional information). Equity Incentive Plan The Company’s Second Restated 2009 Equity Incentive Plan, or the Plan, provides incentive compensation to attract and retain qualified directors, officers, advisors, consultants and other personnel, including PRCM Advisers and its affiliates. The Plan is administered by the compensation committee of the Company’s board of directors.

Acquisition of CYS Investments,

Acquisition of CYS Investments, Inc.	12 Months Ended
	Dec. 31, 2018
Acquisition of CYS Investments, Inc. [Abstract]
Acquisition of CYS Investments, Inc.	Acquisition of CYS Investments, Inc. On July 31, 2018, the Company completed the acquisition of CYS, through a merger of CYS with and into a wholly owned subsidiary of the Company, in exchange for approximately 72.6 million shares of Two Harbors common stock as well as aggregate cash consideration of $15.0 million . In accordance with the merger agreement, the number of shares of Two Harbors common stock issued was based on an exchange ratio of 0.4680 per share and the cash consideration received by CYS common stockholders was $0.0965 per share. In addition, the Company issued 3 million shares of newly classified Series D cumulative redeemable preferred stock and 8 million shares of newly classified Series E cumulative redeemable preferred stock in exchange for all shares of CYS’s Series A and Series B cumulative redeemable preferred stock outstanding prior to the effective time of the merger. The total purchase price for the merger of $1.4 billion consists primarily of Two Harbors common stock issued in exchange for shares of CYS common stock and was calculated based on the $15.50 closing price of Two Harbors common stock on July 31, 2018. (dollars in thousands, except per share prices) July 31, Common Stock Exchange: CYS common stock outstanding 155,102,543 Common exchange ratio 0.4680 Two Harbors common stock to be issued 72,587,990 Less: fractional shares 218 Two Harbors common stock issued 72,587,772 Two Harbors share price $ 15.50 $ 1,125,114 Cash in Lieu of Common Stock: Fractional shares 218 Cash in lieu rate $ 15.59 $ 3 Per Share Cash Consideration: CYS common stock outstanding 155,102,543 Per share cash consideration 0.0965 $ 14,967 Preferred Stock Exchange: Shares Series D preferred stock 3,000,000 $ 75,000 Series E preferred stock 8,000,000 $ 200,000 Total Purchase Price $ 1,415,084 As discussed in Note 2 - Basis of Presentation and Significant Accounting Policies , the merger was accounted for as an asset acquisition. The total purchase price for the merger including direct transaction costs, which exceeded gross assets acquired less liabilities assumed in the merger, was allocated to the individual assets acquired and liabilities assumed on a relative fair value basis, as shown below: (in thousands) July 31, Assets: Available-for-sale securities, at fair value $ 10,034,557 Cash and cash equivalents 386 Restricted cash 1,062 Accrued interest receivable 30,646 Due from counterparties 21,572 Derivative assets, at fair value 314,811 Reverse repurchase agreements 761,460 Other assets 11,947 Total Assets $ 11,176,441 Liabilities: Repurchase agreements $ 8,743,527 Derivative liabilities, at fair value 765,837 Due to counterparties 301,287 Accrued interest payable 27,487 Other liabilities 821 Total Liabilities 9,838,959 Stockholders’ Equity Cumulative deficit (acquisition transaction costs) (77,602 ) Total Stockholders’ Equity $ (77,602 ) Total Purchase Price $ 1,415,084 As there were no meaningful nonfinancial assets and non-current assets in this transaction and no identified intangible assets to assign value, the excess consideration and transaction costs were recognized in the consolidated statements of comprehensive (loss) income

Available-for-Sale Securities,

Available-for-Sale Securities, at Fair Value	12 Months Ended
	Dec. 31, 2018
Debt Securities, Available-for-sale [Abstract]
Available-for-Sale Securities, at Fair Value	Available-for-Sale Securities, at Fair Value The Company holds AFS investment securities which are carried at fair value on the consolidated balance sheets. The following table presents the Company’s AFS investment securities by collateral type as of December 31, 2018 and December 31, 2017 : (in thousands) December 31, December 31, Agency Federal National Mortgage Association $ 15,812,696 $ 13,920,721 Federal Home Loan Mortgage Corporation 4,930,963 3,616,967 Government National Mortgage Association 941,374 701,037 Non-Agency 3,867,571 2,982,094 Total available-for-sale securities $ 25,552,604 $ 21,220,819 At December 31, 2018 and December 31, 2017 , the Company pledged AFS securities with a carrying value of $25.2 billion and $21.0 billion , respectively, as collateral for repurchase agreements and advances from the Federal Home Loan Bank of Des Moines, or the FHLB. See Note 10 - Repurchase Agreements and Note 12 - Federal Home Loan Bank of Des Moines Advances . At December 31, 2018 and December 31, 2017 , the Company did not have any securities purchased from and financed with the same counterparty that did not meet the conditions of ASC 860, to be considered linked transactions and, therefore, classified as derivatives. The Company is not required to consolidate VIEs for which it has concluded it does not have both the power to direct the activities of the VIEs that most significantly impact the entities’ performance, and the obligation to absorb losses or the right to receive benefits of the entities that could be significant. The Company’s investments in these unconsolidated VIEs include all non-Agency securities, which are classified within available-for-sale securities, at fair value on the consolidated balance sheets. As of December 31, 2018 and December 31, 2017 , the carrying value, which also represents the maximum exposure to loss, of all non-Agency securities in unconsolidated VIEs was $3.9 billion and $3.0 billion , respectively. The following tables present the amortized cost and carrying value of AFS securities by collateral type as of December 31, 2018 and December 31, 2017 : December 31, 2018 (in thousands) Principal/ Current Face Un-amortized Premium Accretable Purchase Discount Credit Reserve Purchase Discount Amortized Cost Unrealized Gain Unrealized Loss Carrying Value Agency Principal and interest $ 20,775,790 $ 1,037,781 $ (25,085 ) $ — $ 21,788,486 $ 61,128 $ (339,997 ) $ 21,509,617 Interest-only 3,115,967 209,901 — — 209,901 14,170 (48,655 ) 175,416 Total Agency 23,891,757 1,247,682 (25,085 ) — 21,998,387 75,298 (388,652 ) 21,685,033 Non-Agency Principal and interest 5,360,124 6,682 (694,119 ) (1,322,762 ) 3,349,925 478,095 (44,657 ) 3,783,363 Interest-only 5,137,169 83,846 — — 83,846 3,655 (3,293 ) 84,208 Total Non-Agency 10,497,293 90,528 (694,119 ) (1,322,762 ) 3,433,771 481,750 (47,950 ) 3,867,571 Total $ 34,389,050 $ 1,338,210 $ (719,204 ) $ (1,322,762 ) $ 25,432,158 $ 557,048 $ (436,602 ) $ 25,552,604 December 31, 2017 (in thousands) Principal/ Current Face Un-amortized Premium Accretable Purchase Discount Credit Reserve Purchase Discount Amortized Cost Unrealized Gain Unrealized Loss Carrying Value Agency Principal and interest $ 17,081,849 $ 1,079,246 $ (24,638 ) $ — $ 18,136,457 $ 42,149 $ (134,969 ) $ 18,043,637 Interest-only 2,941,772 223,289 — — 223,289 10,955 (39,156 ) 195,088 Total Agency 20,023,621 1,302,535 (24,638 ) — 18,359,746 53,104 (174,125 ) 18,238,725 Non-Agency Principal and interest 3,758,134 2,757 (676,033 ) (653,613 ) 2,431,245 488,931 (3,166 ) 2,917,010 Interest-only 5,614,925 65,667 — — 65,667 2,163 (2,746 ) 65,084 Total Non-Agency 9,373,059 68,424 (676,033 ) (653,613 ) 2,496,912 491,094 (5,912 ) 2,982,094 Total $ 29,396,680 $ 1,370,959 $ (700,671 ) $ (653,613 ) $ 20,856,658 $ 544,198 $ (180,037 ) $ 21,220,819 The following tables present the carrying value of the Company’s AFS securities by rate type as of December 31, 2018 and December 31, 2017 : December 31, 2018 (in thousands) Agency Non-Agency Total Adjustable Rate $ 19,073 $ 3,475,171 $ 3,494,244 Fixed Rate 21,665,960 392,400 22,058,360 Total $ 21,685,033 $ 3,867,571 $ 25,552,604 December 31, 2017 (in thousands) Agency Non-Agency Total Adjustable Rate $ 23,220 $ 2,622,710 $ 2,645,930 Fixed Rate 18,215,505 359,384 18,574,889 Total $ 18,238,725 $ 2,982,094 $ 21,220,819 The following table presents the Company’s AFS securities according to their estimated weighted average life classifications as of December 31, 2018 : December 31, 2018 (in thousands) Agency Non-Agency Total ≤ 1 year $ 6,301 $ 97,955 $ 104,256 > 1 and ≤ 3 years 124,121 135,457 259,578 > 3 and ≤ 5 years 260,886 428,851 689,737 > 5 and ≤ 10 years 19,550,827 2,582,835 22,133,662 > 10 years 1,742,898 622,473 2,365,371 Total $ 21,685,033 $ 3,867,571 $ 25,552,604 When the Company purchases a credit-sensitive AFS security at a significant discount to its face value, the Company often does not amortize into income a significant portion of this discount that the Company is entitled to earn because the Company does not expect to collect the entire discount due to the inherent credit risk of the security. The Company may also record an other-than-temporary impairment, or OTTI, for a portion of its investment in the security to the extent the Company believes that the amortized cost will exceed the present value of expected future cash flows. The amount of principal that the Company does not amortize into income is designated as a credit reserve on the security, with unamortized net discounts or premiums amortized into income over time to the extent realizable. The following table presents the changes for the years ended December 31, 2018 and 2017 of the net unamortized discount/premium and designated credit reserves on non-Agency AFS securities. Year Ended December 31, 2018 2017 (in thousands) Designated Credit Reserve Net Unamortized Discount/Premium Total Designated Credit Reserve Net Unamortized Discount/Premium Total Beginning balance at January 1 $ (653,613 ) $ (607,609 ) $ (1,261,222 ) $ (367,437 ) $ (623,440 ) $ (990,877 ) Acquisitions (737,765 ) (60,894 ) (798,659 ) (373,051 ) (57,732 ) (430,783 ) Accretion of net discount — 89,111 89,111 — 88,037 88,037 Realized credit losses 26,457 — 26,457 17,539 — 17,539 Reclassification adjustment for other-than-temporary impairments (470 ) — (470 ) (789 ) — (789 ) Transfers from (to) 42,629 (42,629 ) — 66,537 (66,537 ) — Sales, calls, other — 18,430 18,430 3,588 52,063 55,651 Ending balance at December 31 $ (1,322,762 ) $ (603,591 ) $ (1,926,353 ) $ (653,613 ) $ (607,609 ) $ (1,261,222 ) The following table presents the components comprising the carrying value of AFS securities not deemed to be other than temporarily impaired by length of time that the securities had an unrealized loss position as of December 31, 2018 and December 31, 2017 . At December 31, 2018 , the Company held 1,550 AFS securities, of which 290 were in an unrealized loss position for less than twelve consecutive months and 489 were in an unrealized loss position for more than twelve consecutive months. At December 31, 2017 , the Company held 1,435 AFS securities, of which 253 were in an unrealized loss position for less than twelve consecutive months and 234 were in an unrealized loss position for more than twelve consecutive months. Of the $4.4 billion and $12.2 billion of AFS securities in an unrealized loss position for less than twelve consecutive months as of December 31, 2018 and December 31, 2017 , $3.1 billion , or 71.1% , and $12.0 billion , or 98.5% , respectively, were Agency AFS securities, whose principal and interest are guaranteed by the GSEs. Unrealized Loss Position for Less than 12 Months 12 Months or More Total (in thousands) Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses December 31, 2018 $ 4,386,946 $ (66,520 ) $ 9,501,123 $ (370,082 ) $ 13,888,069 $ (436,602 ) December 31, 2017 $ 12,198,870 $ (65,313 ) $ 2,464,544 $ (114,724 ) $ 14,663,414 $ (180,037 ) Evaluating AFS Securities for Other-Than-Temporary Impairments In evaluating AFS securities for OTTI, the Company determines whether there has been a significant adverse quarterly change in the cash flow expectations for a security. The Company compares the amortized cost of each security in an unrealized loss position against the present value of expected future cash flows of the security. The Company also considers whether there has been a significant adverse change in the regulatory and/or economic environment as part of this analysis. If the amortized cost of the security is greater than the present value of expected future cash flows using the original yield as the discount rate, an other-than-temporary credit impairment has occurred. If the Company does not intend to sell and will not be more likely than not required to sell the security, the credit loss is recognized in earnings and the balance of the unrealized loss is recognized in either other comprehensive (loss) income , net of tax, or loss on investment securities , depending on the accounting treatment. If the Company intends to sell the security or will be more likely than not required to sell the security, the full unrealized loss is recognized in earnings. During the years ended December 31, 2018 , 2017 and 2016 , the Company recorded $0.5 million , $0.8 million and $1.8 million in other-than-temporary credit impairments on a total of three , two and four non-Agency securities, respectively, where the future expected cash flows for each security were less than its amortized cost. As of December 31, 2018 , impaired securities with a carrying value of $135.5 million had actual weighted average cumulative losses of 8.8% , weighted average three-month prepayment speed of 5.8% , weighted average 60+ day delinquency of 18.6% of the pool balance, and weighted average FICO score of 667 . At December 31, 2018 , the Company did not intend to sell the securities and determined that it was not more likely than not that the Company will be required to sell the securities; therefore, only the projected credit loss was recognized in earnings. The following table presents the changes in OTTI included in earnings for the years ended December 31, 2018 , 2017 and 2016 : Year Ended December 31, (in thousands) 2018 2017 2016 Cumulative credit loss at beginning of period $ (6,395 ) $ (5,606 ) $ (6,499 ) Additions: Other-than-temporary impairments not previously recognized (264 ) (429 ) (1,307 ) Increases related to other-than-temporary impairments on securities with previously recognized other-than-temporary impairments (206 ) (360 ) (515 ) Reductions: Decreases related to other-than-temporary impairments on securities paid down — — 1,387 Decreases related to other-than-temporary impairments on securities sold — — 1,328 Cumulative credit loss at end of period $ (6,865 ) $ (6,395 ) $ (5,606 ) Cumulative credit losses related to OTTI may be reduced for securities sold as well as for securities that mature, are paid down, or are prepaid such that the outstanding principal balance is reduced to zero. Additionally, increases in cash flows expected to be collected over the remaining life of the security cause a reduction in the cumulative credit loss. Gross Realized Gains and Losses Gains and losses from the sale of AFS securities are recorded as realized gains (losses) within loss on investment securities in the Company’s consolidated statements of comprehensive (loss) income . For the years ended December 31, 2018 , 2017 and 2016 , the Company sold AFS securities for $15.2 billion , $8.7 billion and $14.4 billion with an amortized cost of $15.6 billion , $8.7 billion and $14.5 billion for net realized losses of $349.6 million , $32.5 million and $126.2 million , respectively. The following table presents the gross realized gains and losses on sales of AFS securities for the years ended December 31, 2018 , 2017 and 2016 : Year Ended December 31, (in thousands) 2018 2017 2016 Gross realized gains $ 70,076 $ 67,764 $ 97,049 Gross realized losses (419,638 ) (100,255 ) (223,277 ) Total realized losses on sales, net $ (349,562 ) $ (32,491 ) $ (126,228 )

Servicing Activities

Servicing Activities	12 Months Ended
	Dec. 31, 2018
Disclosures Pertaining to Servicing Assets and Servicing Liabilities [Abstract]
Servicing Activities	Servicing Activities Mortgage Servicing Rights, at Fair Value One of the Company’s wholly owned subsidiaries has approvals from Fannie Mae and Freddie Mac to own and manage MSR, which represent the right to control the servicing of mortgage loans. The Company and its subsidiaries do not originate or directly service mortgage loans, and instead contract with appropriately licensed subservicers to handle substantially all servicing functions in the name of the subservicer for the loans underlying the Company’s MSR. The following table summarizes activity related to MSR for the years ended December 31, 2018 , 2017 and 2016 . Year Ended December 31, (in thousands) 2018 2017 2016 Balance at beginning of period $ 1,086,717 $ 693,815 $ 493,688 Additions from purchases of mortgage servicing rights 988,283 499,866 312,580 Additions from sales of residential mortgage loans — 20 924 Subtractions from sales of mortgage servicing rights — (946 ) (61,511 ) Changes in fair value due to: Changes in valuation inputs or assumptions used in the valuation model 80,209 6,339 16,572 Other changes in fair value (1) (149,879 ) (96,781 ) (78,729 ) Other changes (2) (11,890 ) (15,596 ) 10,291 Balance at end of period $ 1,993,440 $ 1,086,717 $ 693,815 ____________________ (1) Other changes in fair value primarily represents changes due to the realization of expected cash flows. (2) Other changes includes purchase price adjustments, contractual prepayment protection, and changes due to the Company’s purchase of the underlying collateral. At December 31, 2018 and December 31, 2017 , the Company pledged MSR with a carrying value of $1.1 billion and $0.6 billion , respectively, as collateral for repurchase agreements and revolving credit facilities. See Note 10 - Repurchase Agreements and Note 13 - Revolving Credit Facilities . As of December 31, 2018 and December 31, 2017 , the key economic assumptions and sensitivity of the fair value of MSR to immediate 10% and 20% adverse changes in these assumptions were as follows: (dollars in thousands) December 31, December 31, Weighted average prepayment speed: 8.6 % 9.8 % Impact on fair value of 10% adverse change $ (67,245 ) $ (40,100 ) Impact on fair value of 20% adverse change $ (130,371 ) $ (77,483 ) Weighted average delinquency: 1.3 % 1.7 % Impact on fair value of 10% adverse change $ (6,911 ) $ (4,274 ) Impact on fair value of 20% adverse change $ (13,688 ) $ (8,875 ) Weighted average discount rate: 9.4 % 9.9 % Impact on fair value of 10% adverse change $ (62,528 ) $ (35,137 ) Impact on fair value of 20% adverse change $ (121,135 ) $ (68,246 ) These assumptions and sensitivities are hypothetical and should be considered with caution. Changes in fair value based on 10% and 20% variations in assumptions generally cannot be extrapolated because the relationship of the change in assumptions to the change in fair value may not be linear. Also, the effect of a variation in a particular assumption on the fair value of MSR is calculated without changing any other assumptions. In reality, changes in one factor may result in changes in another ( e.g. , increased market interest rates may result in lower prepayments and increased credit losses) that could magnify or counteract the sensitivities. Further, these sensitivities show only the change in the asset balances and do not show any expected change in the fair value of the instruments used to manage the interest rates and prepayment risks associated with these assets. Risk Mitigation Activities The primary risk associated with the Company’s MSR is interest rate risk and the resulting impact on prepayments. A significant decline in interest rates could lead to higher-than-expected prepayments that could reduce the value of the MSR. The Company economically hedges the impact of these risks with its Agency RMBS portfolio. Mortgage Servicing Income The following table presents the components of servicing income recorded on the Company’s consolidated statements of comprehensive (loss) income for the years ended December 31, 2018 , 2017 and 2016 : Year Ended December 31, (in thousands) 2018 2017 2016 Servicing fee income $ 312,100 $ 197,902 $ 138,430 Ancillary and other fee income 1,280 1,009 1,631 Float income 29,716 10,154 3,518 Total $ 343,096 $ 209,065 $ 143,579 Mortgage Servicing Advances In connection with the servicing of loans, the Company’s subservicers make certain payments for property taxes and insurance premiums, default and property maintenance payments, as well as advances of principal and interest payments before collecting them from individual borrowers. Servicing advances, including contractual interest, are priority cash flows in the event of a loan principal reduction or foreclosure and ultimate liquidation of the real estate-owned property, thus making their collection reasonably assured. These servicing advances, which are funded by the Company, totaled $39.7 million and $31.1 million and were included in other assets on the consolidated balance sheets as of December 31, 2018 and December 31, 2017 , respectively. Serviced Mortgage Assets The Company’s total serviced mortgage assets consist of residential mortgage loans underlying MSR, residential mortgage loans held in previous on-balance sheet securitization trusts for which the Company is the named servicing administrator and and other assets. The following table presents the number of loans and unpaid principal balance of the mortgage assets for which the Company manages the servicing as of December 31, 2018 and December 31, 2017 : December 31, 2018 December 31, 2017 (dollars in thousands) Number of Loans Unpaid Principal Balance Number of Loans Unpaid Principal Balance Mortgage servicing rights 717,167 $ 163,102,308 454,028 $ 101,344,054 Residential mortgage loans in securitization trusts 3,612 2,392,471 3,845 2,618,016 Other assets 220 34,374 260 40,222 Total serviced mortgage assets 720,999 $ 165,529,153 458,133 $ 104,002,292

Cash, Cash Equivalents and Rest

Cash, Cash Equivalents and Restricted Cash	12 Months Ended
	Dec. 31, 2018
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash, Cash Equivalents and Restricted Cash	Cash, Cash Equivalents and Restricted Cash Cash and cash equivalents include cash held in bank accounts and cash held in money market funds on an overnight basis. The Company is required to maintain certain cash balances with counterparties for securities and derivatives trading activity and collateral for the Company’s repurchase agreements and FHLB advances in restricted accounts. The Company has also placed cash in a restricted account pursuant to a letter of credit on an office space lease. The following table presents the Company’s restricted cash balances as of December 31, 2018 and December 31, 2017 : (in thousands) December 31, December 31, Restricted cash balances held by trading counterparties: For securities and loan trading activity $ 51,350 $ 27,050 For derivatives trading activity 219,900 191,421 As restricted collateral for repurchase agreements and Federal Home Loan Bank advances 416,696 417,018 Total restricted cash balances held by trading counterparties 687,946 635,489 Restricted cash balance pursuant to letter of credit on office lease 60 347 Total $ 688,006 $ 635,836 The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported on the Company’s consolidated balance sheets as of December 31, 2018 and December 31, 2017 that sum to the total of the same such amounts shown in the statements of cash flows: (in thousands) December 31, December 31, Cash and cash equivalents $ 409,758 $ 419,159 Restricted cash 688,006 635,836 Total cash, cash equivalents and restricted cash $ 1,097,764 $ 1,054,995

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities The Company enters into a variety of derivative and non-derivative instruments in connection with its risk management activities. The primary objective for executing these derivative and non-derivative instruments is to mitigate the Company’s economic exposure to future events that are outside its control, principally market risk and cash flow volatility associated with interest rate risk (including associated prepayment risk). Specifically, the Company enters into derivative and non-derivative instruments to economically hedge interest rate risk or “duration mismatch (or gap)” by adjusting the duration of its floating-rate borrowings into fixed-rate borrowings to more closely match the duration of its assets. This particularly applies to floating-rate borrowing agreements with maturities or interest rate resets of less than six months. Typically, the interest receivable terms ( i.e. , LIBOR) of certain derivatives match the terms of the underlying debt, resulting in an effective conversion of the rate of the related borrowing agreement from floating to fixed. The objective is to manage the cash flows associated with current and anticipated interest payments on borrowings, as well as the ability to roll or refinance borrowings at the desired amount by adjusting the duration. To help manage the adverse impact of interest rate changes on the value of the Company’s portfolio as well as its cash flows, the Company may, at times, enter into various forward contracts, including short securities, Agency to-be-announced securities, or TBAs, options, futures, swaps, caps and total return swaps. In executing on the Company’s current risk management strategy, the Company has entered into interest rate swap, cap and swaption agreements, TBAs, put and call options for TBAs and total return swaps (based on the Markit IOS Index). The Company has also entered into a number of non-derivative instruments to manage interest rate risk, principally MSR and Agency interest-only securities (see discussion below). The following summarizes the Company’s significant asset and liability classes, the risk exposure for these classes, and the Company’s risk management activities used to mitigate these risks. The discussion includes both derivative and non-derivative instruments used as part of these risk management activities. Any of the Company’s derivative and non-derivative instruments may be entered into in conjunction with one another in order to mitigate risks. As a result, the following discussions of each type of instrument should be read as a collective representation of the Company’s risk mitigation efforts and should not be considered independent of one another. While the Company uses derivative and non-derivative instruments to achieve the Company’s risk management activities, it is possible that these instruments will not effectively mitigate all or a substantial portion of the Company’s market rate risk. In addition, the Company might elect, at times, not to enter into certain hedging arrangements in order to maintain compliance with REIT requirements. Balance Sheet Presentation In accordance with ASC 815, Derivatives and Hedging , or ASC 815, the Company records derivative financial instruments on its consolidated balance sheets as assets or liabilities at fair value. Changes in fair value are accounted for depending on the use of the derivative instruments and whether they are designated or qualifying as hedge instruments. Due to the volatility of the credit markets and difficulty in effectively matching pricing or cash flows, the Company has not designated any current derivatives as hedging instruments. The following tables present the gross fair value and notional amounts of the Company’s derivative financial instruments treated as trading derivatives as of December 31, 2018 and December 31, 2017 . December 31, 2018 Derivative Assets Derivative Liabilities (in thousands) Fair Value Notional Fair Value Notional Inverse interest-only securities $ 70,813 $ 476,299 $ — $ — Interest rate swap agreements 187,231 26,798,605 — 2,725,000 Interest rate cap contracts 40,335 2,500,000 — — Swaptions, net — — (13,456 ) 63,000 TBAs 21,602 6,484,000 — — Put and call options for TBAs, net — — (25,296 ) 1,767,000 Markit IOS total return swaps — — (383 ) 48,265 Short U.S. Treasuries — — (781,455 ) 800,000 Total $ 319,981 $ 36,258,904 $ (820,590 ) $ 5,403,265 December 31, 2017 Derivative Assets Derivative Liabilities (in thousands) Fair Value Notional Fair Value Notional Inverse interest-only securities $ 91,827 $ 588,246 $ — $ — Interest rate swap agreements 206,773 21,516,125 (29,867 ) 6,966,000 Swaptions, net 10,405 2,666,000 — — TBAs 913 733,000 (1,930 ) 1,306,000 Markit IOS total return swaps — — (106 ) 63,507 Total $ 309,918 $ 25,503,371 $ (31,903 ) $ 8,335,507 Comprehensive (Loss) Income Statement Presentation The Company has not applied hedge accounting to its current derivative portfolio held to mitigate interest rate risk and credit risk. As a result, the Company is subject to volatility in its earnings due to movement in the unrealized gains and losses associated with its derivative instruments. The following table summarizes the location and amount of gains and losses on derivative instruments reported in the consolidated statements of comprehensive (loss) income : Derivative Instruments Location of Gain (Loss) Recognized in Income on Derivatives Amount of Gain (Loss) Recognized in Income on Derivatives Year Ended (in thousands) December 31, 2018 2017 2016 Interest rate risk management TBAs (Loss) gain on other derivative instruments $ (12,521 ) $ (46,778 ) $ 51,816 Short U.S. Treasuries (Loss) gain on other derivative instruments (26,988 ) — — Put and call options for TBAs (Loss) gain on other derivative instruments (18,457 ) (22,623 ) 64,920 Interest rate swaps - Payers Gain (loss) on interest rate swap, cap and swaption agreements 48,995 67,124 (3,110 ) Interest rate swaps - Receivers Gain (loss) on interest rate swap, cap and swaption agreements (74,407 ) (17,677 ) 37,272 Swaptions Gain (loss) on interest rate swap, cap and swaption agreements 45,954 (59,200 ) 11,209 Interest rate caps Gain (loss) on interest rate swap, cap and swaption agreements (4,499 ) — — Markit IOS total return swaps (Loss) gain on other derivative instruments 125 (870 ) (36,898 ) Credit risk management Credit default swaps - Receive protection (Loss) gain on other derivative instruments — — 962 Non-risk management Inverse interest-only securities (Loss) gain on other derivative instruments 2,984 112 18,579 Forward purchase commmitments (Loss) gain on other derivative instruments — — 2,418 Total $ (38,814 ) $ (79,912 ) $ 147,168 For the years ended December 31, 2018 , 2017 and 2016 , the Company recognized $49.2 million of income and $8.8 million , and $21.1 million of expenses, respectively, for the accrual and/or settlement of the net interest expense associated with its interest rate swaps and caps. The income/expenses result from receiving either LIBOR interest or a fixed interest rate and paying either a fixed interest rate or LIBOR interest on an average $29.4 billion , $19.4 billion and $15.5 billion notional, respectively. The following tables present information with respect to the volume of activity in the Company’s derivative instruments during the years ended December 31, 2018 and 2017 : Year Ended December 31, 2018 (in thousands) Beginning of Period Notional Amount Additions Settlement, Termination, Expiration or Exercise End of Period Notional Amount Average Notional Amount Realized Gain (Loss), net (1) Inverse interest-only securities $ 588,246 $ — $ (111,947 ) $ 476,299 $ 530,509 $ — Interest rate swap agreements 28,482,125 49,269,781 (48,228,301 ) 29,523,605 28,317,793 (71,578 ) Interest rate cap contracts — 2,500,000 — 2,500,000 1,054,795 — Swaptions, net 2,666,000 (35,000 ) (2,568,000 ) 63,000 (1,495,421 ) 67,985 TBAs, net (573,000 ) 64,988,000 (57,931,000 ) 6,484,000 4,502,888 (35,140 ) Short U.S. Treasuries — (800,000 ) — (800,000 ) (337,534 ) — Put and call options for TBAs, net — (451,000 ) (1,316,000 ) (1,767,000 ) (804,997 ) 6,839 Markit IOS total return swaps 63,507 — (15,242 ) 48,265 55,143 (765 ) Total $ 31,226,878 $ 115,471,781 $ (110,170,490 ) $ 36,528,169 $ 31,823,176 $ (32,659 ) Year Ended December 31, 2017 (in thousands) Beginning of Period Notional Amount Additions Settlement, Termination, Expiration or Exercise End of Period Notional Amount Average Notional Amount Realized Gain (Loss), net (1) Inverse interest-only securities $ 740,844 $ — $ (152,598 ) $ 588,246 $ 662,273 $ (40 ) Interest rate swap agreements 20,371,063 36,642,245 (28,531,183 ) 28,482,125 19,447,067 54,476 Swaptions, net 225,000 4,306,000 (1,865,000 ) 2,666,000 1,014,578 8,694 TBAs, net (1,489,000 ) (7,249,400 ) 8,165,400 (573,000 ) (1,256,424 ) (51,810 ) Put and call options for TBAs, net (1,136,000 ) 4,460,000 (3,324,000 ) — 11,978 20,010 Markit IOS total return swaps 90,593 — (27,086 ) 63,507 74,183 (181 ) Total $ 18,802,500 $ 38,158,845 $ (25,734,467 ) $ 31,226,878 $ 19,953,655 $ 31,149 ____________________ (1) Excludes net interest paid or received in full settlement of the net interest spread liability. Cash flow activity related to derivative instruments is reflected within the operating activities and investing activities sections of the consolidated statements of cash flows. Realized gains and losses and derivative fair value adjustments are reflected within the realized and unrealized losses (gains) on interest rate swaps, caps and swaptions and unrealized loss (gain) on other derivative instruments line items within the operating activities section of the consolidated statements of cash flows. The remaining cash flow activity related to derivative instruments is reflected within the (purchases) short sales of other derivative instruments, proceeds from sales (payments for termination) of other derivative instruments, net and increase (decrease) in due to counterparties, net line items within the investing activities section of the consolidated statements of cash flows. Interest Rate Sensitive Assets/Liabilities The Company’s Agency RMBS portfolio is generally subject to change in value when mortgage rates decline or increase, depending on the type of investment. Rising mortgage rates generally result in a slowing of refinancing activity, which slows prepayments and results in a decline in the value of the Company’s fixed-rate Agency pools. To mitigate the impact of this risk on the Company’s fixed-rate Agency pool portfolio, the Company maintains a portfolio of fixed-rate interest-only securities and MSR, which increase in value when interest rates increase. As of December 31, 2018 and December 31, 2017 , the Company had $147.6 million and $117.8 million , respectively, of interest-only securities, and $2.0 billion and $1.1 billion , respectively, of MSR in place to economically hedge its Agency RMBS. Interest-only securities are included in AFS securities, at fair value, in the consolidated balance sheets. The Company monitors its borrowings under repurchase agreements, FHLB advances and revolving credit facilities, which are generally floating-rate debt, in relation to the rate profile of its portfolio. In connection with its risk management activities, the Company enters into a variety of derivative and non-derivative instruments to economically hedge interest rate risk or “duration mismatch (or gap)” by adjusting the duration of its floating-rate borrowings into fixed-rate borrowings to more closely match the duration of its assets. This particularly applies to borrowing agreements with maturities or interest rate resets of less than six months. Typically, the interest receivable terms ( i.e. , LIBOR) of certain derivatives match the terms of the underlying debt, resulting in an effective conversion of the rate of the related borrowing agreement from floating to fixed. The objective is to manage the cash flows associated with current and anticipated interest payments on borrowings, as well as the ability to roll or refinance borrowings at the desired amount by adjusting the duration. To help manage the adverse impact of interest rate changes on the value of the Company’s portfolio as well as its cash flows, the Company may, at times, enter into various forward contracts, including short securities, TBAs, options, futures, swaps, caps, credit default swaps and total return swaps. In executing on the Company’s current interest rate risk management strategy, the Company has entered into TBAs, put and call options for TBAs, interest rate swap, cap and swaption agreements and Markit IOS total return swaps. TBAs. At times, the Company may use TBAs as a means of deploying capital until targeted investments are available or to take advantage of temporary displacements, funding advantages or valuation differentials in the marketplace. Additionally, the Company may use TBAs independently, or in conjunction with other derivative and non-derivative instruments, in order to mitigate risks. TBAs are forward contracts for the purchase (long notional positions) or sale (short notional positions) of Agency RMBS. The issuer, coupon and stated maturity of the Agency RMBS are predetermined as well as the trade price, face amount and future settle date (published each month by the Securities Industry and Financial Markets Association). However, the specific Agency RMBS to be delivered upon settlement is not known at the time of the TBA transaction. As a result, and because physical delivery of the Agency RMBS upon settlement cannot be assured, the Company accounts for TBAs as derivative instruments. The Company may hold both long and short notional TBA positions, which are disclosed on a gross basis according to the unrealized gain or loss position of each TBA contract regardless of long or short notional position. The following tables present the notional amount, cost basis, market value and carrying value (which approximates fair value) of the Company’s TBA positions as of December 31, 2018 and December 31, 2017 : December 31, 2018 Net Carrying Value (4) (in thousands) Notional Amount (1) Cost Basis (2) Market Value (3) Derivative Assets Derivative Liabilities Purchase contracts $ 6,484,000 $ 6,734,858 $ 6,756,460 $ 21,602 $ — Sale contracts — — — — — TBAs, net $ 6,484,000 $ 6,734,858 $ 6,756,460 $ 21,602 $ — December 31, 2017 Net Carrying Value (4) (in thousands) Notional Amount (1) Cost Basis (2) Market Value (3) Derivative Assets Derivative Liabilities Purchase contracts $ 733,000 $ 769,446 $ 770,359 $ 913 $ — Sale contracts (1,306,000 ) (1,316,368 ) (1,318,297 ) — (1,930 ) TBAs, net $ (573,000 ) $ (546,922 ) $ (547,938 ) $ 913 $ (1,930 ) ___________________ (1) Notional amount represents the face amount of the underlying Agency RMBS. (2) Cost basis represents the forward price to be paid (received) for the underlying Agency RMBS. (3) Market value represents the current market value of the TBA (or of the underlying Agency RMBS) as of period-end. (4) Net carrying value represents the difference between the market value of the TBA as of period-end and its cost basis, and is reported in derivative assets / (liabilities), at fair value, in the consolidated balance sheets. Short U.S. Treasuries. The Company may use short U.S. Treasury securities independently, or in conjunction with other derivative and non-derivative instruments, in order to mitigate risks. As of December 31, 2018 , the Company had short sold U.S. Treasuries with a notional amount of $800.0 million with a fair market value of $781.5 million included in derivative liabilities, at fair value, on the consolidated balance sheet as of December 31, 2018 . The Company did not hold any short U.S. Treasuries as of December 31, 2017 . Put and Call Options for TBAs . The Company may use put and call options for TBAs independently, or in conjunction with other derivative and non-derivative instruments, in order to mitigate risks. As of December 31, 2018 , the Company had purchased put and call options for TBAs with a notional amount of $5.4 billion and short sold put and call options for TBAs with a notional amount of $7.2 billion . The put and call options had a fair market value of $25.3 million included in derivative liabilities, at fair value, on the consolidated balance sheet as of December 31, 2018 . The Company did not hold any put and call options for TBAs as of December 31, 2017 . Interest Rate Swap Agreements . The Company may use interest rate swaps independently, or in conjunction with other derivative and non-derivative instruments, in order to mitigate risks. As of December 31, 2018 and December 31, 2017 , the Company held the following interest rate swaps that were utilized as economic hedges of interest rate exposure (or duration) whereby the Company receives interest at a three-month LIBOR rate: (notional in thousands) December 31, 2018 Swaps Maturities Notional Amount (1) Weighted Average Fixed Pay Rate (2) Weighted Average Receive Rate (2) Weighted Average Maturity (Years) (2) 2019 $ 4,336,897 1.769 % 2.565 % 0.79 2020 3,640,000 1.806 % 2.689 % 1.83 2021 4,117,000 1.550 % 2.687 % 2.69 2022 2,470,000 2.002 % 2.728 % 3.75 2023 and Thereafter 6,842,270 2.495 % 2.636 % 7.60 Total $ 21,406,167 1.978 % 2.651 % 3.75 (notional in thousands) December 31, 2017 Swaps Maturities Notional Amount (1) Weighted Average Fixed Pay Rate (2) Weighted Average Receive Rate (2) Weighted Average Maturity (Years) (2) 2018 $ 4,320,000 1.155 % 1.508 % 0.50 2019 5,448,135 1.767 % 1.386 % 1.79 2020 5,490,000 1.945 % 1.509 % 2.87 2021 2,417,000 1.788 % 1.628 % 3.92 2022 and Thereafter 5,245,000 1.764 % 1.516 % 6.44 Total $ 22,920,135 1.694 % 1.493 % 3.01 ____________________ (1) Notional amount includes $572.0 million and $570.0 million in forward starting interest rate swaps as of December 31, 2018 and December 31, 2017 , respectively. (2) Weighted averages exclude forward starting interest rate swaps. As of December 31, 2018 and December 31, 2017 , the weighted average fixed pay rate on forward starting interest rate swaps was 2.8% and 2.1% , respectively. Additionally, as of December 31, 2018 and December 31, 2017 , the Company held the following interest rate swaps in order to mitigate mortgage interest rate exposure (or duration) risk whereby the Company pays interest at a three-month LIBOR rate: (notional in thousands) December 31, 2018 Swaps Maturities Notional Amounts Weighted Average Pay Rate Weighted Average Fixed Receive Rate Weighted Average Maturity (Years) 2020 $ 250,000 2.469 % 2.258 % 1.06 2021 $ 2,477,438 2.538 % 2.736 % 2.24 2022 800,000 2.653 % 2.975 % 3.39 2023 and Thereafter 4,590,000 2.653 % 2.757 % 7.37 Total $ 8,117,438 2.612 % 2.757 % 5.22 (notional in thousands) December 31, 2017 Swaps Maturities Notional Amounts Weighted Average Pay Rate Weighted Average Fixed Receive Rate Weighted Average Maturity (Years) 2020 $ 200,000 1.391 % 1.642 % 2.60 2021 500,000 1.357 % 1.327 % 3.05 2022 and Thereafter 4,861,990 1.475 % 2.325 % 8.34 Total $ 5,561,990 1.462 % 2.211 % 7.66 Interest Rate Swaptions . The Company may use interest rate swaptions (agreements to enter into interest rate swaps in the future for which the Company would either pay or receive a fixed rate) independently, or in conjunction with other derivative and non-derivative instruments, in order to mitigate risks. As of December 31, 2018 and December 31, 2017 , the Company had the following outstanding interest rate swaptions that were utilized as macro-economic hedges: December 31, 2018 (notional and dollars in thousands) Option Underlying Swap Swaption Expiration Cost Basis Fair Value Average Months to Expiration Notional Amount Average Pay Rate Average Receive Rate Average Term (Years) Purchase contracts: Payer < 6 Months $ 4,855 $ 2,430 5.13 $ 900,000 3.16 % 3M Libor 10.0 Payer ≥ 6 Months 8,400 5,992 8.60 800,000 3.14 % 3M Libor 10.0 Total Payer $ 13,255 $ 8,422 7.92 $ 1,700,000 3.15 % 3M Libor 10.0 Sale contracts: Receiver < 6 Months $ (4,855 ) $ (9,001 ) 4.74 $ (845,000 ) 3M Libor 2.66 % 10.0 Receiver ≥ 6 Months $ (8,400 ) $ (12,877 ) 8.60 $ (792,000 ) 3M Libor 2.64 % 10.0 Total Receiver $ (13,255 ) $ (21,878 ) 7.52 $ (1,637,000 ) 3M Libor 2.65 % 10.0 December 31, 2017 (notional and dollars in thousands) Option Underlying Swap Swaption Expiration Cost Fair Value Average Months to Expiration Notional Amount Average Fixed Pay Rate Average Receive Rate Average Term (Years) Purchase contracts: Payer < 6 Months $ 21,380 $ 17,736 4.03 $ 7,200,000 2.27 % 3M Libor 3.8 Receiver < 6 Months $ 4,660 $ 2,982 3.72 $ 2,300,000 3M Libor 2.10 % 10.0 Sale contracts: Payer < 6 Months $ (7,950 ) $ (5,619 ) 4.66 $ (1,693,000 ) 2.70 % 3M Libor 10.0 Receiver < 6 Months $ (16,260 ) $ (4,694 ) 5.17 $ (5,141,000 ) 3M Libor 1.89 % 5.6 Interest Rate Cap Contracts . The Company may use interest rate caps independently, or in conjunction with other derivative and non-derivative instruments, in order to mitigate risks. As of December 31, 2018 , the Company held the following interest rate caps that were utilized as economic hedges of interest rate exposure (or duration) whereby the Company receives interest at a three-month LIBOR rate, net of a fixed cap rate: (notional in thousands) December 31, 2018 Caps Maturities Notional Amount Weighted Average Cap Rate Weighted Average Receive Rate Weighted Average Maturity (Years) 2019 $ 800,000 1.344 % 2.422 % 0.53 2020 $ 1,700,000 1.250 % 2.766 % 1.29 Total $ 2,500,000 1.280 % 2.656 % 1.04 The Company did not hold any interest rate caps as of December 31, 2017 . Markit IOS Total Return Swaps . The Company may use total return swaps (agreements whereby the Company receives or makes payments based on the total return of an underlying instrument or index, such as the Markit IOS Index, in exchange for fixed or floating rate interest payments) independently, or in conjunction with other derivative and non-derivative instruments, in order to mitigate risks. The Company enters into total return swaps to help mitigate the potential impact of larger increases or decreases in interest rates on the performance of our portfolio (referred to as “convexity risk”). Total return swaps based on the Markit IOS Index are intended to synthetically replicate the performance of interest-only securities. The Company had the following total return swap agreements in place at December 31, 2018 and December 31, 2017 : (notional and dollars in thousands) December 31, 2018 Maturity Date Current Notional Amount Fair Value Cost Basis Unrealized Gain (Loss) January 12, 2043 $ (21,395 ) $ (153 ) $ (30 ) $ (123 ) January 12, 2044 (26,870 ) (230 ) (29 ) (201 ) Total $ (48,265 ) $ (383 ) $ (59 ) $ (324 ) (notional and dollars in thousands) December 31, 2017 Maturity Date Current Notional Amount Fair Value Cost Basis Unrealized Gain (Loss) January 12, 2043 $ (24,362 ) $ (24 ) $ 201 $ (225 ) January 12, 2044 (39,145 ) (82 ) 366 (448 ) Total $ (63,507 ) $ (106 ) $ 567 $ (673 ) Credit Risk The Company’s exposure to credit losses on its Agency RMBS portfolio is limited due to implicit or explicit backing from the GSEs. The payment of principal and interest on the Freddie Mac and Fannie Mae mortgage-backed securities are guaranteed by those respective agencies, and the payment of principal and interest on the Ginnie Mae mortgage-backed securities are backed by the full faith and credit of the U.S. government. For non-Agency investment securities and residential mortgage loans, the Company may enter into credit default swaps to hedge credit risk. In future periods, the Company could enhance its credit risk protection, enter into further paired derivative positions, including both long and short credit default swaps, and/or seek opportunistic trades in the event of a market disruption (see discussion under “Non-Risk Management Activities” below). The Company also has processes and controls in place to monitor, analyze, manage and mitigate its credit risk with respect to non-Agency securities and residential mortgage loans. Derivative financial instruments contain an element of credit risk if counterparties are unable to meet the terms of the agreements. Credit risk associated with derivative financial instruments is measured as the net replacement cost should the counterparties that owe the Company under such contracts completely fail to perform under the terms of these contracts, assuming there are no recoveries of underlying collateral, as measured by the market value of the derivative financial instruments. As of December 31, 2018 , the fair value of derivative financial instruments as an asset and liability position was $320.0 million and $820.6 million , respectively. The Company attempts to mitigate its credit risk exposure on derivative financial instruments by limiting its counterparties to banks and financial institutions that meet established credit guidelines. The Company also seeks to spread its credit risk exposure across multiple counterparties in order to reduce its exposure to any single counterparty. Additionally, the Company reduces credit risk on the majority of its derivative instruments by entering into agreements that permit the closeout and netting of transactions with the same counterparty or clearing agency, in the case of centrally cleared interest rate swaps, upon the occurrence of certain events. To further mitigate the risk of counterparty default, the Company maintains collateral agreements with certain of its counterparties and clearing agencies, which require both parties to maintain cash deposits in the event the fair values of the derivative financial instruments exceed established thresholds. The Company’s centrally cleared interest rate swaps require that the Company posts an “initial margin” amount determined by the clearing exchange, which is generally intended to be set at a level sufficient to protect the exchange from the interest rate swap’s maximum estimated single-day price movement. The Company also exchanges “variation margin” based upon daily changes in fair value, as measured by the exchange. As a result of amendments to rules governing certain central clearing activities, the exchange of variation margin is considered a settlement of the interest rate swap, as opposed to pledged collateral. Accordingly, beginning in the first quarter of 2018 and in subsequent periods, the Company accounts for the receipt or payment of variation margin as a direct reduction to the carrying value of the interest rate swap asset or liability. As of December 31, 2017, variation margin pledged or received was netted on a counterparty basis and classified within restricted cash, due from counterparties, or due to counterparties on the Company’s consolidated

Offsetting Assets and Liabiliti

Offsetting Assets and Liabilities Offsetting Assets and Liabilities	12 Months Ended
	Dec. 31, 2018
Offsetting [Abstract]
Offsetting Assets and Liabilities	Offsetting Assets and Liabilities Certain of the Company’s repurchase agreements are governed by underlying agreements that provide for a right of setoff in the event of default by either party to the agreement. The Company also has netting arrangements in place with all derivative counterparties pursuant to standard documentation developed by the International Swap and Derivatives Association, or ISDA, or central clearing exchange agreements, in the case of centrally cleared interest rate swaps. The Company and the counterparty or clearing agency are required to post cash collateral based upon the net underlying market value of the Company’s open positions with the counterparty. Additionally, the Company’s centrally cleared interest rate swaps require that the Company posts an “initial margin” amount determined by the clearing exchange, which is generally intended to be set at a level sufficient to protect the exchange from the interest rate swap’s maximum estimated single-day price movement. The Company also exchanges “variation margin” based upon daily changes in fair value, as measured by the exchange. Under U.S. GAAP, if the Company has a valid right of setoff, it may offset the related asset and liability and report the net amount. As a result of amendments to rules governing certain central clearing activities, the exchange of variation margin is considered a settlement of the interest rate swap, as opposed to pledged collateral. Accordingly, beginning in the first quarter of 2018 and in subsequent periods, the Company accounts for the receipt or payment of variation margin on CME and LCH cleared positions as a direct reduction to the carrying value of the interest rate swap asset or liability. The receipt or payment of initial margin will continue to be accounted for separate from the interest rate swap asset or liability. As of December 31, 2017, variation margin pledged or received was netted on a counterparty basis and classified within restricted cash, due from counterparties, or due to counterparties on the Company’s consolidated balance sheets. The Company presents repurchase agreements subject to master netting arrangements or similar agreements on a gross basis and derivative assets and liabilities (other than centrally cleared interest rate swaps) subject to such arrangements on a net basis, based on derivative type and counterparty, in its consolidated balance sheets. Separately, the Company presents cash collateral subject to such arrangements (other than variation margin on centrally cleared interest rate swaps) on a net basis, based on counterparty, in its consolidated balance sheets. However, the Company does not offset repurchase agreements or derivative assets and liabilities (other than centrally cleared interest rate swaps) with the associated cash collateral on its consolidated balance sheets. The following tables present information about the Company’s assets and liabilities that are subject to master netting arrangements or similar agreements and can potentially be offset on the Company’s consolidated balance sheets as of December 31, 2018 and December 31, 2017 : December 31, 2018 Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Balance Sheets (1) (in thousands) Gross Amounts of Recognized Assets (Liabilities) Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Assets (Liabilities) Presented in the Consolidated Balance Sheets Financial Instruments Cash Collateral (Received) Pledged Net Amount Assets Derivative assets $ 599,573 $ (279,592 ) $ 319,981 $ (58,775 ) $ — $ 261,206 Reverse repurchase agreements 761,815 $ — $ 761,815 (761,815 ) $ — $ — Total Assets $ 1,361,388 $ (279,592 ) $ 1,081,796 $ (820,590 ) $ — $ 261,206 Liabilities Repurchase agreements $ (23,133,476 ) $ — $ (23,133,476 ) $ 23,133,476 $ — $ — Derivative liabilities (1,100,182 ) 279,592 (820,590 ) 820,590 — — Total Liabilities $ (24,233,658 ) $ 279,592 $ (23,954,066 ) $ 23,954,066 $ — $ — December 31, 2017 Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Balance Sheets (1) (in thousands) Gross Amounts of Recognized Assets (Liabilities) Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Assets (Liabilities) Presented in the Consolidated Balance Sheets Financial Instruments Cash Collateral (Received) Pledged Net Amount Assets Derivative assets $ 340,576 $ (30,658 ) $ 309,918 $ (31,903 ) $ — $ 278,015 Total Assets $ 340,576 $ (30,658 ) $ 309,918 $ (31,903 ) $ — $ 278,015 Liabilities Repurchase agreements $ (19,451,207 ) $ — $ (19,451,207 ) $ 19,451,207 $ — $ — Derivative liabilities (62,561 ) 30,658 (31,903 ) 31,903 — — Total Liabilities $ (19,513,768 ) $ 30,658 $ (19,483,110 ) $ 19,483,110 $ — $ — ____________________ (1) Amounts presented are limited in total to the net amount of assets or liabilities presented in the consolidated balance sheets by instrument. Excess cash collateral or financial assets that are pledged to counterparties may exceed the financial liabilities subject to a master netting arrangement or similar agreement, or counterparties may have pledged excess cash collateral to the Company that exceed the corresponding financial assets. These excess amounts are excluded from the table above, although separately reported within restricted cash, due from counterparties, or due to counterparties in the Company’s consolidated

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value	Fair Value Fair Value Measurements ASC 820 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC 820 clarifies that fair value should be based on the assumptions market participants would use when pricing an asset or liability and establishes a fair value hierarchy that prioritizes the information used to develop those assumptions. The fair value hierarchy gives the highest priority to quoted prices available in active markets ( i.e. , observable inputs) and the lowest priority to data lacking transparency ( i.e. , unobservable inputs). Additionally, ASC 820 requires an entity to consider all aspects of nonperformance risk, including the entity’s own credit standing, when measuring fair value of a liability. ASC 820 establishes a three-level hierarchy to be used when measuring and disclosing fair value. An instrument’s categorization within the fair value hierarchy is based on the lowest level of significant input to its valuation. Following is a description of the three levels: Level 1 Inputs are quoted prices in active markets for identical assets or liabilities as of the measurement date under current market conditions. Additionally, the entity must have the ability to access the active market and the quoted prices cannot be adjusted by the entity. Level 2 Inputs include quoted prices in active markets for similar assets or liabilities; quoted prices in inactive markets for identical or similar assets or liabilities; or inputs that are observable or can be corroborated by observable market data by correlation or other means for substantially the full-term of the assets or liabilities. Level 3 Unobservable inputs are supported by little or no market activity. The unobservable inputs represent the assumptions that market participants would use to price the assets and liabilities, including risk. Generally, Level 3 assets and liabilities are valued using pricing models, discounted cash flow methodologies, or similar techniques that require significant judgment or estimation. The following are descriptions of the valuation methodologies used to measure material assets and liabilities at fair value and details of the valuation models, key inputs to those models and significant assumptions utilized. Available-for-sale securities . The Company holds a portfolio of AFS securities that are carried at fair value in the consolidated balance sheets and primarily comprised of Agency RMBS and non-Agency securities. The Company determines the fair value of its Agency RMBS based upon prices obtained from third-party pricing providers received using bid price, which are deemed indicative of market activity. The third-party pricing providers use pricing models that generally incorporate such factors as coupons, primary and secondary mortgage rates, rate reset period, issuer, prepayment speeds, credit enhancements and expected life of the security. In determining the fair value of its non-Agency securities, management judgment may be used to arrive at fair value that considers prices obtained from third-party pricing providers and other applicable market data. If observable market prices are not available or insufficient to determine fair value due principally to illiquidity in the marketplace, then fair value is based upon internally developed models that are primarily based on observable market-based inputs but also include unobservable market data inputs (including prepayment speeds, delinquency levels, and credit losses). The Company classified 99.6% and 0.4% of its AFS securities as Level 2 and Level 3 fair value assets, respectively, at December 31, 2018 . AFS securities account for 91.7% of all assets reported at fair value at December 31, 2018 . Mortgage servicing rights . The Company holds a portfolio of MSR that are carried at fair value on the consolidated balance sheets. The Company determines fair value of its MSR based on prices obtained from third-party pricing providers. Although MSR transactions are observable in the marketplace, the valuation is based upon cash flow models that include unobservable market data inputs (including prepayment speeds, delinquency levels and discount rates). As a result, the Company classified 100% of its MSR as Level 3 fair value assets at December 31, 2018 . Derivative instruments . The Company may enter into a variety of derivative financial instruments as part of its hedging strategies. The Company principally executes over-the-counter, or OTC, derivative contracts, such as interest rate swaps, caps, swaptions, put and call options for TBAs and Markit IOS total return swaps. The Company utilizes third-party pricing providers to value its financial derivative instruments. The Company classified 100% of the interest rate swaps, caps, swaptions, put and call options for TBAs and Markit IOS total return swaps reported at fair value as Level 2 at December 31, 2018 . The Company may also enter into certain other derivative financial instruments, such as TBAs, short U.S. Treasuries and inverse interest-only securities. These instruments are similar in form to the Company’s AFS securities and the Company utilizes a pricing service to value TBAs, short U.S. Treasuries and inverse interest-only securities. The Company classified 100% of its short U.S. Treasuries and inverse interest-only securities at fair value as Level 2 at December 31, 2018 . The Company reported 100% of its TBAs as Level 1 as of December 31, 2018 . The Company’s risk management committee governs trading activity relating to derivative instruments. The Company’s policy is to minimize credit exposure related to financial derivatives used for hedging by limiting the hedge counterparties to major banks, financial institutions, exchanges, and private investors who meet established capital and credit guidelines as well as by limiting the amount of exposure to any individual counterparty. The Company has netting arrangements in place with all derivative counterparties pursuant to standard documentation developed by ISDA, or central clearing exchange agreements, in the case of centrally cleared interest rate swaps. Additionally, both the Company and the counterparty or clearing agency are required to post cash collateral based upon the net underlying market value of the Company’s open positions with the counterparty. Posting of cash collateral typically occurs daily, subject to certain dollar thresholds. Due to the existence of netting arrangements, as well as frequent cash collateral posting at low posting thresholds, credit exposure to the Company and/or to the counterparty or clearing agency is considered materially mitigated. Based on the Company’s assessment, there is no requirement for any additional adjustment to derivative valuations specifically for credit. Equity securities. The Company’s equity securities are carried at fair value and reported in other assets on the consolidated balance sheets. Changes in fair value are recorded as a component of loss on investment securities in the consolidated statements of comprehensive (loss) income . The Company determines fair value of its equity securities based on the closing market price of the securities at period end. The Company did not hold any equity securities at December 31, 2018 . The following tables display the Company’s assets and liabilities measured at fair value on a recurring basis. The Company often economically hedges the fair value change of its assets or liabilities with derivatives and other financial instruments. The tables below display the hedges separately from the hedged items, and therefore do not directly display the impact of the Company’s risk management activities. Recurring Fair Value Measurements December 31, 2018 (in thousands) Level 1 Level 2 Level 3 Total Assets Available-for-sale securities $ — $ 25,447,447 $ 105,157 $ 25,552,604 Mortgage servicing rights — — 1,993,440 1,993,440 Derivative assets 21,602 298,379 — 319,981 Total assets $ 21,602 $ 25,745,826 $ 2,098,597 $ 27,866,025 Liabilities Derivative liabilities $ — $ 820,590 $ — $ 820,590 Total liabilities $ — $ 820,590 $ — $ 820,590 Recurring Fair Value Measurements December 31, 2017 (in thousands) Level 1 Level 2 Level 3 Total Assets Available-for-sale securities $ — $ 21,067,678 $ 153,141 $ 21,220,819 Mortgage servicing rights — — 1,086,717 1,086,717 Derivative assets 913 309,005 — 309,918 Other assets 29,413 — — 29,413 Total assets $ 30,326 $ 21,376,683 $ 1,239,858 $ 22,646,867 Liabilities Derivative liabilities 1,930 29,973 — 31,903 Total liabilities $ 1,930 $ 29,973 $ — $ 31,903 The Company may be required to measure certain assets or liabilities at fair value from time to time. These periodic fair value measures typically result from application of certain impairment measures under U.S. GAAP. These items would constitute nonrecurring fair value measures under ASC 820. As of December 31, 2018 , the Company did not have any assets or liabilities measured at fair value on a nonrecurring basis in the periods presented. The valuation of Level 3 instruments requires significant judgment by the third-party pricing providers and/or management. The third-party pricing providers and/or management rely on inputs such as market price quotations from market makers (either market or indicative levels), original transaction price, recent transactions in the same or similar instruments, and changes in financial ratios or cash flows to determine fair value. Level 3 instruments may also be discounted to reflect illiquidity and/or non-transferability, with the amount of such discount estimated by the third-party pricing providers in the absence of market information. Assumptions used by the third-party pricing providers due to lack of observable inputs may significantly impact the resulting fair value and therefore the Company’s consolidated financial statements. The Company’s valuation committee reviews all valuations that are based on pricing information received from third-party pricing providers. As part of this review, prices are compared against other pricing or input data points in the marketplace, along with internal valuation expertise, to ensure the pricing is reasonable. In addition, the Company performs back-testing of pricing information to validate price information and identify any pricing trends of a third-party price provider. In determining fair value, third-party pricing providers use various valuation approaches, including market and income approaches. Inputs that are used in determining fair value of an instrument may include pricing information, credit data, volatility statistics, and other factors. In addition, inputs can be either observable or unobservable. The availability of observable inputs can vary by instrument and is affected by a wide variety of factors, including the type of instrument, whether the instrument is new and not yet established in the marketplace and other characteristics particular to the instrument. The third-party pricing provider uses prices and inputs that are current as of the measurement date, including during periods of market dislocations. In periods of market dislocation, the availability of prices and inputs may be reduced for many instruments. This condition could cause an instrument to be reclassified to or from various levels within the fair value hierarchy. Securities for which market quotations are readily available are valued at the bid price (in the case of long positions) or the ask price (in the case of short positions) at the close of trading on the date as of which value is determined. Exchange-traded securities for which no bid or ask price is available are valued at the last traded price. OTC derivative contracts, including interest rate swaps, caps and swaption agreements, put and call options for TBAs and U.S. Treasuries, constant maturity swaps, credit default swaps and Markit IOS total return swaps, are valued by the Company using observable inputs, specifically quotations received from third-party pricing providers, and are therefore classified within Level 2. The following tables present the reconciliation for all of the Company’s Level 3 assets measured at fair value on a recurring basis: Year Ended December 31, 2018 (in thousands) Available-For-Sale Securities Mortgage Servicing Rights Beginning of period level 3 fair value $ 153,141 $ 1,086,717 Gains (losses) included in net (loss) income: Realized gains and losses, net (2,538 ) (149,242 ) Unrealized gains and losses, net — 80,209 Net gains (losses) included in net (loss) income (2,538 ) (69,033 ) Other comprehensive (loss) income (1,960 ) — Purchases 17,861 988,283 Sales — (637 ) Settlements (153,000 ) (11,890 ) Gross transfers into level 3 91,653 — Gross transfers out of level 3 — — End of period level 3 fair value $ 105,157 $ 1,993,440 Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period — $ 68,518 Change in unrealized gains or losses for the period included in other comprehensive (loss) income for assets held at the end of the reporting period (1,818 ) $ — Year Ended December 31, 2017 (in thousands) Available-For-Sale Securities Mortgage Servicing Rights Beginning of period level 3 fair value $ — $ 693,815 Gains (losses) included in net (loss) income: Realized gains and (losses), net — (97,372 ) Unrealized gains and (losses), net — 6,339 Net gains (losses) included in net (loss) income — (91,033 ) Other comprehensive (loss) income 141 — Purchases 153,000 499,886 Sales — (355 ) Settlements — (15,596 ) Gross transfers into level 3 — — Gross transfers out of level 3 — — End of period level 3 fair value $ 153,141 $ 1,086,717 Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period $ — $ 5,870 Change in unrealized gains or losses for the period included in other comprehensive (loss) income for assets held at the end of the reporting period 141 $ — ____________________ (1) The change in unrealized gains or losses on MSR was recorded in loss on servicing asset on the consolidated statements of comprehensive (loss) income . (2) The change in unrealized gains or losses on MSR that were held at the end of the reporting period was recorded in loss on servicing asset on the consolidated statements of comprehensive (loss) income . The Company transferred certain AFS from Level 2 to Level 3 based the observability of inputs during the year ended December 31, 2018 . No additional AFS transfers between Level 1, Level 2 or Level 3 were made during the year ended December 31, 2018 . The Company did not transfer AFS between Level 1, Level 2 or Level 3 during the year ended December 31, 2017 . Transfers between Levels are deemed to take place on the first day of the reporting period in which the transfer has taken place. The Company used third-party pricing providers in the fair value measurement of its Level 3 available-for-sale securities. The significant unobservable inputs used by the third-party pricing provider included expected default, severity and discount rate. Significant increases (decreases) in any of the inputs in isolation may result in significantly lower (higher) fair value measurement. The Company also used multiple third-party pricing providers in the fair value measurement of its Level 3 MSR. The table below presents information about the significant unobservable inputs used by the third-party pricing providers in the fair value measurement of the Company’s MSR classified as Level 3 fair value assets at December 31, 2018 : December 31, 2018 Valuation Technique Unobservable Input (1) Range Weighted Average (2) Discounted cash flow Constant prepayment speed 7.6 - 9.6 % 8.6% Delinquency 1.0 - 1.5 % 1.3% Discount rate 8.2 - 10.7 % 9.4% December 31, 2017 Valuation Technique Unobservable Input (1) Range Weighted Average (2) Discounted cash flow Constant prepayment speed 8.2 - 11.2 % 9.8% Delinquency 1.3 - 2.0 % 1.7% Discount rate 8.3 - 11.2 % 9.9% ___________________ (1) Significant increases (decreases) in any of the inputs in isolation may result in significantly lower (higher) fair value measurement. A change in the assumption used for discount rates may be accompanied by a directionally similar change in the assumption used for the probability of delinquency and a directionally opposite change in the assumption used for prepayment rates. (2) Calculated by averaging the weighted average significant unobservable inputs used by the multiple third-party pricing providers in the fair value measurement of MSR. Fair Value Option for Financial Assets and Financial Liabilities The Company elected the fair value option for its previously held residential mortgage loans held-for-investment in securitization trusts and the collateralized borrowings in securitization trusts. The fair value option was elected to better reflect the economics of the Company’s retained interests. The Company’s policy was to separately record interest income on the fair value elected loans and interest expense on the fair value elected borrowings. Upfront fees and costs were not deferred or capitalized. Fair value adjustments were reported in other income on the consolidated statements of comprehensive (loss) income . During the fourth quarter of 2017, the Company sold all of these retained subordinated securities thereby causing the deconsolidation of the securitization trusts from the Company’s consolidated balance sheet. The remaining retained securities are included within non-Agency AFS securities. The following tables summarize the fair value option elections and information regarding the line items and amounts recognized in the consolidated statements of comprehensive (loss) income for each fair value option-elected item. Year Ended December 31, 2017 (in thousands) Interest income (expense) Other income Total included in net (loss) income Change in fair value due to credit risk Assets Residential mortgage loans held-for-investment in securitization trusts 102,886 (1) 45,275 148,161 $ — (2) Liabilities Collateralized borrowings in securitization trusts (82,573 ) (22,592 ) (105,165 ) — (2) Total $ 20,313 $ 22,683 $ 42,996 $ — Year Ended December 31, 2016 (in thousands) Interest income (expense) Other income Total included in net (loss) income Change in fair value due to credit risk Assets Residential mortgage loans held-for-investment in securitization trusts 133,993 (1) (19,741 ) 114,252 — (2) Liabilities Collateralized borrowings in securitization trusts (97,729 ) 7,907 (89,822 ) — (2) Total $ 36,264 $ (11,834 ) $ 24,430 $ — ____________________ (1) Interest income on residential mortgage loans held-for-investment in securitization trusts is measured by multiplying the unpaid principal balance on the loans by the coupon rate and the number of days of interest due. (2) The change in fair value on residential mortgage loans held-for-investment in securitization trusts and collateralized borrowings in securitization trusts was due entirely to changes in market interest rates. Fair Value of Financial Instruments In accordance with ASC 820, the Company is required to disclose the fair value of financial instruments, both assets and liabilities recognized and not recognized in the consolidated balance sheets, for which fair value can be estimated. The following describes the Company’s methods for estimating the fair value for financial instruments. • AFS securities, MSR, and derivative assets and liabilities are recurring fair value measurements; carrying value equals fair value. See discussion of valuation methods and assumptions within the Fair Value Measurements section of this Note 9 . • Cash and cash equivalents and restricted cash have a carrying value which approximates fair value because of the short maturities of these instruments. The Company categorizes the fair value measurement of these assets as Level 1. • Reverse repurchase agreements have a carrying value which approximates fair value due to their short-term nature. The Company categorizes the fair value measurement of these assets as Level 2. • The carrying value of repurchase agreements, FHLB advances and revolving credit facilities that mature in less than one year generally approximates fair value due to the short maturities. As of December 31, 2018 , the Company held $300.0 million of repurchase agreements, $50.0 million of FHLB advances and $290.0 million of revolving credit facilities that are considered long-term. The Company’s long-term repurchase agreements, FHLB advances and revolving credit facilities have floating rates based on an index plus a spread and, for members of the FHLB, the credit spread is typically consistent with those demanded in the market. Accordingly, the interest rates on these borrowings are at market and thus carrying value approximates fair value. The Company categorizes the fair value measurement of these liabilities as Level 2. • Convertible senior notes are carried at their unpaid principal balance, net of any unamortized deferred issuance costs. The Company estimates the fair value of its convertible senior notes using the market transaction price nearest to December 31, 2018 . The Company categorizes the fair value measurement of these assets as Level 2. The following table presents the carrying values and estimated fair values of assets and liabilities that are required to be recorded or disclosed at fair value at December 31, 2018 and December 31, 2017 . December 31, 2018 December 31, 2017 (in thousands) Carrying Value Fair Value Carrying Value Fair Value Assets Available-for-sale securities $ 25,552,604 $ 25,552,604 $ 21,220,819 $ 21,220,819 Mortgage servicing rights $ 1,993,440 $ 1,993,440 $ 1,086,717 $ 1,086,717 Cash and cash equivalents $ 409,758 $ 409,758 $ 419,159 $ 419,159 Restricted cash $ 688,006 $ 688,006 $ 635,836 $ 635,836 Derivative assets $ 319,981 $ 319,981 $ 309,918 $ 309,918 Reverse repurchase agreements $ 761,815 $ 761,815 $ — $ — Other assets $ 74,412 $ 74,412 116,653 116,653 Liabilities Repurchase agreements $ 23,133,476 $ 23,133,476 $ 19,451,207 $ 19,451,207 Federal Home Loan Bank advances $ 865,024 $ 865,024 $ 1,215,024 $ 1,215,024 Revolving credit facilities $ 310,000 $ 310,000 $ 20,000 $ 20,000 Convertible senior notes $ 283,856 $ 281,951 $ 282,827 $ 306,351 Derivative liabilities $ 820,590 $ 820,590 $ 31,903 $ 31,903

Repurchase Agreements

Repurchase Agreements	12 Months Ended
	Dec. 31, 2018
Disclosure of Repurchase Agreements [Abstract]
Repurchase Agreements	Repurchase Agreements As of December 31, 2018 and December 31, 2017 , the Company had outstanding $23.1 billion and $19.5 billion , respectively, of repurchase agreements. Excluding the effect of the Company’s interest rate swaps and caps, the repurchase agreements had a weighted average borrowing rate of 2.68% and 1.69% and weighted average remaining maturities of 66 and 83 days as of December 31, 2018 and December 31, 2017 , respectively. At December 31, 2018 and December 31, 2017 , the repurchase agreement balances were as follows: (in thousands) December 31, December 31, Short-term $ 22,833,476 $ 19,338,707 Long-term 300,000 112,500 Total $ 23,133,476 $ 19,451,207 At December 31, 2018 and December 31, 2017 , the repurchase agreements had the following characteristics and remaining maturities: December 31, 2018 Collateral Type (in thousands) Agency RMBS Non-Agency Securities Agency Derivatives Mortgage Servicing Rights Total Amount Outstanding Within 30 days $ 6,712,021 $ 770,287 $ 6,561 $ — $ 7,488,869 30 to 59 days 4,557,688 496,466 23,444 — 5,077,598 60 to 89 days 5,410,967 242,473 1,621 — 5,655,061 90 to 119 days 1,209,395 722,399 7,065 — 1,938,859 120 to 364 days 2,201,325 463,939 7,825 — 2,673,089 One year and over — — — 300,000 300,000 Total $ 20,091,396 $ 2,695,564 $ 46,516 $ 300,000 $ 23,133,476 Weighted average borrowing rate 2.52 % 3.65 % 3.34 % 4.51 % 2.68 % December 31, 2017 Collateral Type (in thousands) Agency RMBS Non-Agency Securities Agency Derivatives Mortgage Servicing Rights Total Amount Outstanding Within 30 days $ 3,634,541 $ 613,500 $ 21,423 $ — $ 4,269,464 30 to 59 days 3,522,256 261,835 47,020 — 3,831,111 60 to 89 days 3,165,834 290,628 2,478 — 3,458,940 90 to 119 days 2,119,490 332,614 322 — 2,452,426 120 to 364 days 4,883,432 443,334 — — 5,326,766 One year and over — — — 112,500 112,500 Total $ 17,325,553 $ 1,941,911 $ 71,243 $ 112,500 $ 19,451,207 Weighted average borrowing rate 1.53 % 2.98 % 2.15 % 3.78 % 1.69 % The following table summarizes assets at carrying values that are pledged or restricted as collateral for the future payment obligations of repurchase agreements and derivative instruments: (in thousands) December 31, December 31, Available-for-sale securities, at fair value $ 24,240,507 $ 19,780,175 Mortgage servicing rights, at fair value 685,683 424,740 Cash and cash equivalents — 15,000 Restricted cash 416,696 417,018 Due from counterparties 110,695 773,422 Derivative assets, at fair value 70,191 90,895 U.S. Treasuries (1) 6,457 — Total $ 25,530,229 $ 21,501,250 ____________________ (1) U.S. Treasuries received as collateral and re-pledged. Although the transactions under repurchase agreements represent committed borrowings until maturity, the respective lender retains the right to mark the underlying collateral to fair value. A reduction in the value of pledged assets would require the Company to provide additional collateral or fund margin calls. The following table summarizes certain characteristics of the Company’s repurchase agreements and counterparty concentration at December 31, 2018 and December 31, 2017 : December 31, 2018 December 31, 2017 (dollars in thousands) Amount Outstanding Net Counterparty Exposure (1) Percent of Equity Weighted Average Days to Maturity Amount Outstanding Net Counterparty Exposure (1) Percent of Equity Weighted Average Days to Maturity Royal Bank of Canada $ 2,504,438 $ 342,739 8 % 94 $ 1,261,956 $ 223,347 6 % 75 All other counterparties (2) 20,629,038 1,679,335 39 % 63 18,189,251 1,519,776 43 % 84 Total $ 23,133,476 $ 2,022,074 $ 19,451,207 $ 1,743,123 ____________________ (1) Represents the net carrying value of the assets sold under agreements to repurchase, including accrued interest plus any cash or assets on deposit to secure the repurchase obligation, less the amount of the repurchase liability, including accrued interest. The Company did not have any such payables at December 31, 2018 nor December 31, 2017 . (2) Represents amounts outstanding with 29 and 26 counterparties at December 31, 2018 and December 31, 2017 , respectively.

Reverse Repurchase Agreements R

Reverse Repurchase Agreements Reverse Repurchase Agreements	12 Months Ended
	Dec. 31, 2018
Reverse Repurchase Agreements [Abstract]
Reverse Repurchase Agreements	Reverse Repurchase Agreements As of December 31, 2018, the Company held securities, consisting of U.S Treasury securities, with a fair value of $781.5 million as collateral for reverse repurchase agreements that could be pledged, delivered or otherwise used, with a fair value of $761.8 million

Federal Home Loan Bank of Des M

Federal Home Loan Bank of Des Moines Advances	12 Months Ended
	Dec. 31, 2018
Advances from Federal Home Loan Banks [Abstract]
Federal Home Loan Bank of Des Moines Advances	Federal Home Loan Bank of Des Moines Advances The Company’s wholly owned subsidiary, TH Insurance Holdings Company LLC, or TH Insurance, is a member of the FHLB. As a member of the FHLB, TH Insurance has access to a variety of products and services offered by the FHLB, including secured advances. As of December 31, 2018 and December 31, 2017 , TH Insurance had $0.9 billion and $1.2 billion in outstanding secured advances with a weighted average borrowing rate of 2.79% and 1.79% , respectively. As of December 31, 2018 and December 31, 2017 , TH Insurance had an additional $2.7 billion and $2.2 billion of available uncommitted capacity for borrowings, respectively, insofar as TH Insurance holds adequate total assets to support a new advance. To the extent TH Insurance has uncommitted capacity, it may be adjusted at the sole discretion of the FHLB. The ability to borrow from the FHLB is subject to the Company’s continued creditworthiness, pledging of sufficient eligible collateral to secure advances, and compliance with certain agreements with the FHLB. Each advance requires approval by the FHLB and is secured by collateral in accordance with the FHLB’s credit and collateral guidelines, as may be revised from time to time by the FHLB. Eligible collateral may include conventional 1-4 family residential mortgage loans, Agency RMBS and certain non-Agency securities with a rating of A and above. On January 11, 2016, the Federal Housing Finance Agency, or FHFA, released a final rule regarding membership in the Federal Home Loan Bank system. Among other effects, the final rule excludes captive insurers from membership eligibility, including the Company’s subsidiary member, TH Insurance. Since TH Insurance was admitted as a member in 2013, it is eligible for a membership grace period that runs through February 19, 2021, during which new advances or renewals that mature beyond the grace period will be prohibited; however, any existing advances that mature beyond this grace period will be permitted to remain in place subject to their terms insofar as the Company maintains good standing with the FHLB. If any new advances or renewals occur, TH Insurance’s outstanding advances will be limited to 40% of its total assets. At December 31, 2018 and December 31, 2017 , FHLB advances had the following remaining maturities: (in thousands) December 31, December 31, ≤ 1 year $ 815,024 $ — > 1 and ≤ 3 years — 815,024 > 3 and ≤ 5 years — — > 5 and ≤ 10 years — — > 10 years 50,000 400,000 Total $ 865,024 $ 1,215,024 The following table summarizes assets at carrying values that are pledged or restricted as collateral for the future payment obligations of FHLB advances: (in thousands) December 31, December 31, Available-for-sale securities, at fair value $ 917,492 $ 1,210,715 Due from counterparties — 62,959 Total $ 917,492 $ 1,273,674 The FHLB retains the right to mark the underlying collateral for FHLB advances to fair value. A reduction in the value of pledged assets would require the Company to provide additional collateral. In addition, as a condition to membership in the FHLB, the Company is required to purchase and hold a certain amount of FHLB stock, which is based, in part, upon the outstanding principal balance of advances from the FHLB. At December 31, 2018 and December 31, 2017 , the Company had stock in the FHLB totaling $40.8 million and $53.8 million , respectively, which is included in other assets on the consolidated balance sheets. FHLB stock is considered a non-marketable, long-term investment, is carried at cost and is subject to recoverability testing under applicable accounting standards. This stock can only be redeemed or sold at its par value, and only to the FHLB. Accordingly, when evaluating FHLB stock for impairment, the Company considers the ultimate recoverability of the par value rather than recognizing temporary declines in value. As of December 31, 2018 and December 31, 2017

Revolving Credit Facilities

Revolving Credit Facilities	12 Months Ended
	Dec. 31, 2018
Revolving Credit Facilities [Abstract]
Revolving Credit Facilities	Revolving Credit Facilities To finance MSR, the Company has entered into revolving credit facilities collateralized by the value of the MSR pledged. As of December 31, 2018 and December 31, 2017 , the Company had outstanding short- and long-term borrowings under revolving credit facilities of $310.0 million and $20.0 million with a weighted average borrowing rate of 5.60% and 5.14% and weighted average remaining maturities of 4.25 and 0.96 years, respectively. At December 31, 2018 and December 31, 2017 , borrowings under revolving credit facilities had the following remaining maturities: (in thousands) December 31, December 31, Within 30 days $ — $ — 30 to 59 days — — 60 to 89 days — — 90 to 119 days — — 120 to 364 days 20,000 20,000 One year and over 290,000 — Total $ 310,000 $ 20,000 Although the transactions under revolving credit facilities represent committed borrowings from the time of funding until maturity, the respective lender retains the right to mark the underlying collateral to fair value. A reduction in the value of pledged assets below a designated threshold would require the Company to provide additional collateral or pay down the facility. As of December 31, 2018 and December 31, 2017 , MSR with a carrying value of $458.2 million and $159.5 million

Convertible Senior Notes

Convertible Senior Notes	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Convertible Senior Notes	Convertible Senior Notes In January 2017, the Company closed an underwritten public offering of $287.5 million aggregate principal amount of convertible senior notes due 2022. The net proceeds from the offering were approximately $282.2 million after deducting underwriting discounts and estimated offering expenses payable by the Company. The notes are unsecured, pay interest semiannually at a rate of 6.25% per annum and are convertible at the option of the holder into shares of the Company’s common stock. The notes will mature in January 2022 , unless earlier converted or repurchased in accordance with their terms. The Company does not have the right to redeem the notes prior to maturity, but may be required to repurchase the notes from holders under certain circumstances. As of December 31, 2018 and December 31, 2017 , the notes had a conversion rate of 62.4003 and 61.4698 shares of common stock per $1,000 principal amount of the notes, respectively . The outstanding amount due on the convertible senior notes as of December 31, 2018 and December 31, 2017 was $283.9 million and $282.8 million

Commitments and Contingencies (

Commitments and Contingencies (Notes)	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure	Commitments and Contingencies The following represent the material commitments and contingencies of the Company as of December 31, 2018 : Management agreement. The Company pays PRCM Advisers a management fee equal to 1.5% per annum, calculated and payable quarterly in arrears, of the Company’s stockholders’ equity. For purposes of calculating the management fee, the Company’s stockholders’ equity means the sum of the net proceeds from all issuances of the Company’s equity securities since inception (allocated on a pro rata daily basis for such issuances during the fiscal quarter of any such issuance), plus the Company’s retained earnings at the end of the most recently completed calendar quarter (without taking into account any non-cash equity compensation expense incurred in current or prior periods), less the consolidated stockholders’ equity of Granite Point and its subsidiaries during the time Granite Point was consolidated on the Company’s balance sheet, the weighted average cost basis of Granite Point common stock purchased, the outstanding principal balance of the promissory note due from the sale of Granite Point preferred stock and any amount that the Company has paid for repurchases of its common stock since inception, and excluding any unrealized gains, losses or other items that do not affect realized net income (regardless of whether such items are included in other comprehensive income or loss, or in net income). In connection with the acquisition of CYS, the Management Agreement was amended to (i) reduce PRCM Advisers’ base management fee with respect to the additional equity under management resulting from the merger to 0.75% from the effective time through the first anniversary of the effective time and (ii) for the fiscal quarter in which closing of the merger occured, to make a one-time downward adjustment of Pine River’s management fees payable by Two Harbors for such quarter by $15.0 million to offset the cash consideration payable to stockholders of CYS, plus an additional downward adjustment of up to $3.3 million for certain transaction-related expenses. This amount will be adjusted to exclude one-time events pursuant to changes in U.S. GAAP, and certain non-cash items after discussions between PRCM Advisers and the Company’s independent directors and approval by a majority of the Company’s independent directors. To the extent asset impairment reduces the Company’s retained earnings at the end of any completed calendar quarter; it will reduce the management fee for such quarter. The Company’s stockholders’ equity for the purposes of calculating the management fee could be greater than the amount of stockholders’ equity shown on the consolidated financial statements. The current term of the management agreement expires on October 28, 2019 , and automatically renews for successive one-year terms annually until terminated in accordance with the terms of the agreement. The Company reimburses PRCM Advisers for (i) the Company’s allocable share of the compensation paid by PRCM Advisers to its personnel serving as the Company’s principal financial officer and general counsel and personnel employed by PRCM Advisers as in-house legal, tax, accounting, consulting, auditing, administrative, information technology, valuation, computer programming and development and back-office resources to the Company, and (ii) any amounts for personnel of PRCM Adviser’s affiliates arising under a shared facilities and services agreement. Upon termination of the management agreement by the Company without cause or by PRCM Advisers due to the Company’s material breach of the management agreement, the Company is required to pay a termination fee equal to three times the sum of the average annual base management fee earned by PRCM Advisers during the 24-month period immediately preceding the date of termination, calculated as of the end of the most recently completed fiscal quarter prior to the date of termination. Employment contracts. The Company does not directly employ any personnel. Instead, the Company relies on the resources of PRCM Advisers to conduct the Company’s operations. Expense reimbursements to PRCM Advisers are made in cash on a quarterly basis following the end of each quarter. Legal and regulatory. From time to time, the Company may be subject to liability under laws and government regulations and various claims and legal actions arising in the ordinary course of business. Liabilities are established for legal claims when payments associated with the claims become probable and the costs can be reasonably estimated. The actual costs of resolving legal claims may be substantially higher or lower than the amounts established for those claims. Based on information currently available, management is not aware of any legal or regulatory claims that would have a material effect on the Company’s consolidated financial statements and therefore no accrual is required as of December 31, 2018

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Stockholders' Equity	Equity Redeemable Preferred Stock The following is a summary of the Company's series of cumulative redeemable preferred stock issued and outstanding as of December 31, 2018 . In the event of a voluntary or involuntary liquidation, dissolution or winding up of the Company, each series of preferred stock will rank on parity with one another and rank senior to the Company's common stock with respect to the payment of the dividends and the distribution of assets. As of December 31, 2018 (in thousands) Class of Stock Issuance Date Shares issued and outstanding Carrying Value Contractual rate Redemption date (1) Fixed to floating rate conversion date (2) Floating annual rate (3) Fixed-to-Floating rate Series A March 14, 2017 5,750 138,872 8.125 % April 27, 2027 April 27, 2027 3M LIBOR + 5.660% Series B July 19, 2017 11,500 278,094 7.625 % July 27, 2027 July 27, 2027 3M LIBOR + 5.352% Series C November 27, 2017 11,800 285,584 7.250 % January 27, 2025 January 27, 2025 3M LIBOR + 5.011% Fixed Rate Series D July 31, 2018 3,000 74,964 7.750 % July 31, 2018 N/A N/A Series E July 31, 2018 8,000 199,987 7.500 % July 31, 2018 N/A N/A Total 40,050 $977,501 ____________________ (1) Subject to the Company's right under limited circumstances to redeem the preferred stock earlier than the redemption date disclosed in order to preserve its qualification as a REIT or following a change in control of the Company. (2) For the fixed-to-floating rate redeemable preferred stock, the dividend rate will remain at a annual fixed rate of the $25.00 per share liquidation preference from the issuance date up to but not including the transition date disclosed within. Effective the conversion date and onward, dividends will accumulate on a floating rate basis according to the terms disclosed within (3) below. (3) On and after the fixed to floating rate conversion date, the dividend will accumulate and be payable quarterly at a percentage of the $25.00 per share liquidation preference equal to an annual floating rate of three-month LIBOR plus the spread indicated within each preferred class. On July 31, 2018, upon the closing of the merger with CYS, the Company issued 3,000,000 shares of newly classified 7.75% Series D Cumulative Redeemable Preferred Stock, par value $0.01 per share, and 8,000,000 shares of newly classified 7.50% Series E Cumulative Redeemable Preferred Stock, par value $0.01 per share, in exchange for all shares of CYS’s Series A and Series B cumulative redeemable preferred stock outstanding prior to the effective time of the merger. Pursuant to the terms of the merger agreement with CYS, the terms of the Company’s Series D and Series E Cumulative Redeemable Preferred Stock are substantially similar to the terms of CYS’s Series A and Series B Cumulative Redeemable Preferred Stock. For each series of preferred stock, the Company may redeem the stock on or after the redemption date in whole or in part, at any time or from time to time. Each series of preferred stock has a par value of $ 0.01 per share and a liquidation and redemption price of $ 25.00 , plus any accumulated and unpaid dividends thereon up to, but excluding, the redemption date. Through December 31, 2018 , the Company had declared and paid all required quarterly dividends on the Company’s preferred stock. Distributions to Preferred Stockholders The following table presents cash dividends declared by the Company on its preferred stock since their issuances: Declaration Date Record Date Payment Date Cash Dividend Per Preferred Share Series A Preferred Stock: December 18, 2018 December 31, 2018 January 28, 2019 $ 0.507810 September 20, 2018 October 12, 2018 October 29, 2018 $ 0.507810 June 19, 2018 July 12, 2018 July 27, 2018 $ 0.507810 March 20, 2018 April 12, 2018 April 27, 2018 $ 0.507810 December 14, 2017 January 12, 2018 January 29, 2018 $ 0.507810 September 14, 2017 October 12, 2017 October 27, 2017 $ 0.507810 June 15, 2017 July 12, 2017 July 27, 2017 $ 0.750430 Series B Preferred Stock: December 18, 2018 December 31, 2018 January 28, 2019 $ 0.476560 September 20, 2018 October 12, 2018 October 29, 2018 $ 0.476560 June 19, 2018 July 12, 2018 July 27, 2018 $ 0.476560 March 20, 2018 April 12, 2018 April 27, 2018 $ 0.476560 December 14, 2017 January 12, 2018 January 29, 2018 $ 0.476560 September 14, 2017 October 12, 2017 October 27, 2017 $ 0.518920 Series C Preferred Stock: December 18, 2018 December 31, 2018 January 28, 2019 $ 0.453130 September 20, 2018 October 12, 2018 October 29, 2018 $ 0.453130 June 19, 2018 July 12, 2018 July 27, 2018 $ 0.453130 March 20, 2018 April 12, 2018 April 27, 2018 $ 0.453130 December 14, 2017 January 12, 2018 January 29, 2018 $ 0.302080 Series D Preferred Stock: December 18, 2018 December 31, 2018 January 28, 2019 $ 0.484375 September 20, 2018 October 1, 2018 October 15, 2018 $ 0.484375 Series E Preferred Stock: December 18, 2018 December 31, 2018 January 28, 2019 $ 0.468750 September 20, 2018 October 1, 2018 October 15, 2018 $ 0.468750 Common Stock Issuance of Common Stock in Connection with Acquisition of CYS Investments, Inc. On July 31, 2018, in exchange for all of the shares of CYS common stock outstanding immediately prior to the effective time of the merger, the Company issued approximately 72.6 million new shares of common stock, as well as aggregate cash consideration of $15.0 million , to CYS common stockholders. Reverse Stock Split On September 14, 2017, the Company’s board of directors approved a one-for-two reverse stock split of its outstanding shares of common stock. The reverse stock split was effected on November 1, 2017 at 5:01 p.m. Eastern Time, following the special dividend of Granite Point common stock. At the effective time, every two issued and outstanding shares of the Company’s common stock were converted into one share of common stock. No fractional shares were issued in connection with the reverse stock split; instead, each stockholder holding fractional shares was entitled to receive, in lieu of such fractional shares, cash in an amount determined on the basis of the volume weighted average price of the Company’s common stock on the NYSE on November 1, 2017. In connection with the reverse stock split, the number of authorized shares of the Company’s common stock was also reduced on a one-for-two basis, from 900 million to 450 million . The par value of each share of common stock remained unchanged. All per share amounts, common shares outstanding and restricted shares for all periods presented have been adjusted on a retroactive basis to reflect the reverse stock split. As of December 31, 2018 , the Company had 248,085,721 shares of common stock outstanding. The following table presents a reconciliation of the common shares outstanding for the years ended December 31, 2018 , 2017 and 2016 : Number of common shares Common shares outstanding, December 31, 2015 176,953,403 Issuance of common stock 30,301 Issuance of restricted stock (1) 852,459 Repurchase of common stock (4,010,000 ) Common shares outstanding, December 31, 2016 173,826,163 Issuance of common stock 26,950 Issuance of restricted stock (1) 643,474 Common shares outstanding, December 31, 2017 174,496,587 Issuance of common stock 72,616,483 Issuance of restricted stock (1) 972,651 Common shares outstanding, December 31, 2018 248,085,721 ____________________ (1) Represents shares of restricted stock granted under the Second Restated 2009 Equity Incentive Plan, net of forfeitures, of which 1,593,701 restricted shares remained subject to vesting requirements at December 31, 2018 . Distributions to Common Stockholders The following table presents cash dividends declared by the Company on its common stock during the he years ended December 31, 2018 , 2017 and 2016 : Declaration Date Record Date Payment Date Cash Dividend Per Common Share December 18, 2018 December 31, 2018 January 28, 2019 $ 0.470000 September 20, 2018 October 1, 2018 October 29, 2018 $ 0.311630 July 13, 2018 July 25, 2018 July 30, 2018 $ 0.158370 June 19, 2018 June 29, 2018 July 27, 2018 $ 0.470000 March 20, 2018 April 2, 2018 April 27, 2018 $ 0.470000 December 14, 2017 December 26, 2017 December 29, 2017 $ 0.470000 September 14, 2017 September 29, 2017 October 27, 2017 $ 0.520000 June 15, 2017 June 30, 2017 July 27, 2017 $ 0.520000 March 14, 2017 March 31, 2017 April 27, 2017 $ 0.500000 December 15, 2016 December 30, 2016 January 27, 2017 $ 0.480000 September 15, 2016 September 30, 2016 October 20, 2016 $ 0.460000 June 16, 2016 June 30, 2016 July 20, 2016 $ 0.460000 March 15, 2016 March 31, 2016 April 21, 2016 $ 0.460000 On September 14, 2017, the Company’s board of directors declared a special dividend pursuant to which the 33.1 million shares of Granite Point common stock acquired by the Company in exchange for the contribution of its equity interests in TH Commercial Holdings LLC to Granite Point on June 28, 2017 would be distributed, on a pro rata basis, to the holders of Two Harbors common stock outstanding at the close of business on October 20, 2017. The Granite Point common stock was distributed on November 1, 2017. Due to its controlling ownership interest in Granite Point through November 1, 2017, the Company consolidated Granite Point on its financial statements. Effective November 1, 2017 (the date the 33.1 million shares of Granite Point common stock were distributed to the Company’s common stockholders), the Company no longer had a controlling interest in Granite Point and, therefore, deconsolidated Granite Point and its subsidiaries from its financial statements and reclassified all of Granite Point’s prior period assets, liabilities and results of operations to discontinued operations. Dividend Reinvestment and Direct Stock Purchase Plan The Company sponsors a dividend reinvestment and direct stock purchase plan through which stockholders may purchase additional shares of the Company’s common stock by reinvesting some or all of the cash dividends received on shares of the Company’s common stock. Stockholders may also make optional cash purchases of shares of the Company’s common stock subject to certain limitations detailed in the plan prospectus. The plan allows for the issuance of up to an aggregate of 3,750,000 shares of the Company’s common stock. As of December 31, 2018 , 227,852 shares have been issued under the plan for total proceeds of approximately $4.4 million , of which 28,711 , 27,194 and 30,301 shares were issued for total proceeds of $0.4 million , $0.5 million and $0.5 million during the years ended December 31, 2018 , 2017 and 2016 , respectively. Share Repurchase Program The Company’s share repurchase program allows for the repurchase of up to an aggregate of 37,500,000 shares of the Company’s common stock. Shares may be repurchased from time to time through privately negotiated transactions or open market transactions, pursuant to a trading plan in accordance with Rules 10b5-1 and 10b-18 under the Securities Exchange Act of 1934, as amended, or the Exchange Act, or by any combination of such methods. The manner, price, number and timing of share repurchases are subject to a variety of factors, including market conditions and applicable SEC rules. The share repurchase program does not require the purchase of any minimum number of shares, and, subject to SEC rules, purchases may be commenced or suspended at any time without prior notice. The share repurchase program does not have an expiration date. As of December 31, 2018 , a total of 12,067,500 shares had been repurchased by the Company under the program for an aggregate cost of $200.4 million ; of these, 4,010,000 shares were repurchased for a total cost of $61.3 million during the year ended December 31, 2016 . No shares were repurchased during the years ended December 31, 2018 and 2017 . At-the-Market Offering As of December 31, 2018, the Company was party to an equity distribution agreement under which the Company was authorized to sell up to an aggregate of 10,000,000 shares of its common stock from time to time in any method permitted by law deemed to be an “at the market” offering as defined in Rule 415 under the Securities Act of 1933, as amended, or the Securities Act. As of December 31, 2018 , 3,792,935 shares of common stock had been sold under the equity distribution agreement for total accumulated net proceeds of approximately $77.6 million . No shares were sold during the years ended December 31, 2018 , 2017 and 2016 . Subsequent to year-end, the Company terminated its prior equity distribution agreement and entered into a new equity distribution agreement with a total of 35,000,000 shares authorized for issuance. Refer to Note 21 - Subsequent Events for further discussion. Accumulated Other Comprehensive (Loss) Income Accumulated other comprehensive (loss) income at December 31, 2018 and December 31, 2017 was as follows: (in thousands) December 31, December 31, Available-for-sale securities Unrealized gains $ 498,744 $ 475,694 Unrealized losses (387,927 ) (140,881 ) Accumulated other comprehensive (loss) income $ 110,817 $ 334,813 Reclassifications out of Accumulated Other Comprehensive (Loss) Income The Company reclassifies unrealized gains and losses on AFS securities in accumulated other comprehensive income to net (loss) income upon the recognition of any other-than-temporary impairments and realized gains and losses on sales, net of income tax effects, as individual securities are impaired or sold. The following table summarizes reclassifications out of accumulated other comprehensive income for the years ended December 31, 2018 , 2017 and 2016 : Affected Line Item in the Consolidated Statements of Comprehensive (Loss) Income Amount Reclassified out of Accumulated Other Comprehensive (Loss) Income Year Ended (in thousands) December 31, 2018 2017 2016 Other-than-temporary impairments on AFS securities Total other-than-temporary impairment losses $ 470 $ 789 $ 1,822 Realized losses (gains) on sales of certain AFS securities, net of tax Loss on investment securities 253,869 5,207 (102,852 ) Total $ 254,339 $ 5,996 $ (101,030 )

Equity Incentive Plan

Equity Incentive Plan	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity Incentive Plan	Equity Incentive Plan The Company’s Plan provides incentive compensation to attract and retain qualified directors, officers, advisors, consultants and other personnel, including PRCM Advisers and affiliates and employees of PRCM Advisers and its affiliates, and any joint venture affiliates of the Company. The Plan is administered by the compensation committee of the Company’s board of directors. The compensation committee has the full authority to administer and interpret the Plan, to authorize the granting of awards, to determine the eligibility of directors, officers, advisors, consultants and other personnel, including PRCM Advisers and affiliates and personnel of PRCM Advisers and its affiliates, and any joint venture affiliates of the Company, to receive an award, to determine the number of shares of common stock to be covered by each award (subject to the individual participant limitations provided in the Plan), to determine the terms, provisions and conditions of each award (which may not be inconsistent with the terms of the Plan), to prescribe the form of instruments evidencing awards and to take any other actions and make all other determinations that it deems necessary or appropriate in connection with the Plan or the administration or interpretation thereof. In connection with this authority, the compensation committee may, among other things, establish performance goals that must be met in order for awards to be granted or to vest, or for the restrictions on any such awards to lapse. The Company’s Plan provides for grants of restricted common stock, phantom shares, dividend equivalent rights and other equity-based awards, subject to a ceiling of 6,500,000 shares available for issuance under the Plan. The Plan allows for the Company’s board of directors to expand the types of awards available under the Plan to include long-term incentive plan units in the future. If an award granted under the Plan expires or terminates, the shares subject to any portion of the award that expires or terminates without having been exercised or paid, as the case may be, will again become available for the issuance of additional awards. Unless earlier terminated by the Company’s board of directors, no new award may be granted under the Plan after the tenth anniversary of the date that such Plan was initially approved by the Company’s board of directors. No award may be granted under the Plan to any person who, assuming payment of all awards held by such person, would own or be deemed to own more than 9.8% of the outstanding shares of the Company’s common stock. All per share amounts, common shares outstanding and restricted shares for all periods presented reflect the Company’s one-for-two reverse stock split effected on November 1, 2017 (refer to Note 16 - Stockholders’ Equity for additional information). During the years ended December 31, 2018 , 2017 and 2016 , the Company granted 55,553 , 34,559 and 40,869 shares of common stock, respectively, to its independent directors pursuant to the Plan. The estimated fair value of these awards was $15.48 , $19.82 and $16.86 per share on grant date, based on the adjusted closing price of the Company’s common stock on the NYSE on such date. The grants vested immediately. Additionally, during the years ended December 31, 2018 , 2017 and 2016 , the Company granted 941,371 , 637,286 and 968,761 shares of restricted common stock, respectively, to key employees of PRCM Advisers pursuant to the terms of the Plan and the associated award agreements. The estimated fair value of these awards was $15.12 , $17.48 and $15.04 per share on grant date, based on the adjusted closing market price of the Company’s common stock on the NYSE on such date. The shares underlying the grants vest in three equal annual installments commencing on the first anniversary of the grant date, as long as such grantee complies with the terms and conditions of his or her applicable restricted stock award agreement. During the year ended December 31, 2016, in connection with the restructuring activities, certain agreements were forfeited and re-granted with accelerated vesting terms, in accordance with ASC 718, Compensation - Stock Compensation . The following table summarizes the activity related to restricted common stock for the year ended December 31, 2018 and 2017 : Year Ended December 31, 2018 2017 Shares Weighted Average Grant Date Fair Market Value Shares Weighted Average Grant Date Fair Market Value Outstanding at Beginning of Period 1,284,010 $ 17.15 1,319,712 $ 17.10 Granted 996,924 14.96 671,845 17.60 Vested (673,118 ) (17.12 ) (684,727 ) (17.47 ) Forfeited (14,115 ) (15.59 ) (22,820 ) (17.90 ) Outstanding at End of Period 1,593,701 $ 15.81 1,284,010 $ 17.15 For the years ended December 31, 2018 , 2017 and 2016 , the Company recognized compensation related to restricted common stock granted pursuant to the Plan of $13.0 million , $11.3 million and $15.2 million

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the years ended December 31, 2018 , 2017 and 2016 , the Company qualified to be taxed as a REIT under the Code for U.S. federal income tax purposes. As long as the Company qualifies as a REIT, the Company generally will not be subject to U.S. federal income taxes on its taxable income to the extent it annually distributes its net taxable income to stockholders, and does not engage in prohibited transactions. The Company intends to distribute 100% of its REIT taxable income and comply with all requirements to continue to qualify as a REIT. The majority of states also recognize the Company’s REIT status. The Company’s TRSs file separate tax returns and are fully taxed as standalone U.S. C-corporations. The tables below reflect the net taxes accrued at the TRS level and the tax attributes included in the consolidated financial statements. It is assumed that the Company will retain its REIT status and will incur no REIT level taxation as it intends to comply with the REIT regulations and annual distribution requirements. Certain activities the Company performs may produce income that will not be qualifying income for REIT purposes. These activities include the designated portion of MSR treated as normal mortgage servicing, residential mortgage loans, certain derivative financial instruments and other risk-management instruments. The Company has designated its TRSs to engage in these activities. The following table summarizes the tax (benefit) provision from continuing operations recorded at the taxable subsidiary level for the years ended December 31, 2018 , 2017 and 2016 : Year Ended December 31, (in thousands) 2018 2017 2016 Current tax (benefit) provision: Federal $ 52 $ 492 $ (1,616 ) State 1 57 164 Total current tax (benefit) provision 53 549 (1,452 ) Deferred tax (benefit) provision 41,770 (11,031 ) 13,766 Total (benefit from) provision for income taxes $ 41,823 $ (10,482 ) $ 12,314 During the year ended December 31, 2018 , the Company’s TRSs recognized a provision for income taxes of $41.8 million , which was primarily due to realized gains on sales of AFS securities and gains recognized on MSR held in the TRSs as well as the write-down of net deferred tax assets resulting from the deemed liquidation of one of the Company’s TRSs due to its TRS election revocation, offset by net losses incurred on derivative instruments held in the TRS. During the year ended December 31, 2017 , the Company’s TRSs recognized a benefit from income taxes of $10.5 million , which was primarily due to the remeasurement of federal net deferred tax assets resulting from the permanent reduction in the U.S. statutory corporate tax rate from 35% to 21% , realized losses on sales of AFS securities and net losses incurred on derivative instruments held in the Company’s TRSs. The Company’s taxable income before dividend distributions differs from its pre-tax net income for U.S. GAAP purposes primarily due to unrealized gains and losses, the recognition of credit losses for U.S. GAAP purposes but not tax purposes, differences in timing of income recognition due to market discount, and original issue discount and the calculations surrounding each. These book to tax differences in the REIT are not reflected in the consolidated financial statements as the Company intends to retain its REIT status. The following is a reconciliation of the statutory federal and state rates to the effective rates, for the years ended December 31, 2018 , 2017 and 2016 : Year Ended December 31, 2018 2017 2016 (dollars in thousands) Amount Percent Amount Percent Amount Percent Computed income tax expense at federal rate $ (518 ) 21 % $ 104,215 35 % $ 127,957 35 % State taxes, net of federal benefit, if applicable 1 — % 37 — % 106 — % Permanent differences in taxable income from GAAP net income (1) 28,414 (1,152 )% 1,208 — % 401 — % Dividends paid deduction 13,926 (565 )% (115,942 ) (39 )% (116,150 ) (32 )% (Benefit from) provision for income taxes/ Effective Tax Rate (2) $ 41,823 (1,696 )% $ (10,482 ) (4 )% $ 12,314 3 % ____________________ (1) For the year ended December 31, 2018 , permanent differences include a provision of 17.8 million related to the write-down of the net deferred tax assets resulting from the deemed liquidation of three of the Company’s TRSs due to their election revocation, offset by the reversal of the valuation allowance upon TRS revocation. For the year ended December 31, 2017 , permanent differences include a provision of $17.5 million related to the effect of the federal tax reform statutory rate change from 35% to 21% . (2) The provision for (benefit from) income taxes is recorded at the taxable subsidiary level. The Company’s permanent differences in taxable income from GAAP net (loss) income in the year ended December 31, 2018 was primarily due to the intercompany sale of RMBS between the Company’s TRS and the REIT, as well as the write-down of net deferred tax assets resulting from the deemed liquidation of three of the Company’s TRSs due to their TRS election revocation, offset by the reversal of the valuation allowance upon TRS revocation. Additionally, the Company’s recurring permanent differences in taxable income from GAAP net (loss) income in the years ended December 31, 2018, 2017 and 2016 were due to a difference in the dividends paid deduction for tax, compensation expense related to restricted stock dividends and, for the years ended December 31, 2017 and 2016, net losses incurred by consolidated securitization trusts that are not subject to federal taxes. The Company’s consolidated balance sheets, as of December 31, 2018 and December 31, 2017 contain the following current and deferred tax liabilities and assets, which are included in other assets, and are recorded at the taxable subsidiary level: (in thousands) December 31, December 31, Income taxes receivable Federal income taxes receivable $ 690 $ 130 State and local income taxes receivable — — Income taxes receivable, net 690 130 Deferred tax assets (liabilities) Deferred tax asset 17,196 50,419 Deferred tax liability (18,333 ) (24,463 ) Total net deferred tax (liabilities) assets (1,137 ) 25,956 Total tax assets (liabilities), net $ (447 ) $ 26,086 Deferred Tax Assets and Liabilities Deferred income taxes reflect the net tax effect of temporary differences between the carrying amount of assets and liabilities for financial reporting and tax purposes at the TRS level. Components of the Company’s deferred tax liabilities and assets as of December 31, 2018 and December 31, 2017 were as follows: (in thousands) December 31, December 31, Available-for-sale securities $ 19 $ (11,917 ) Mortgage servicing rights (18,333 ) (9,054 ) Derivative assets and liabilities 33 4,870 Other assets 9 139 Other liabilities 652 545 Intangibles 101 108 Alternative minimum tax credit — 2,386 Net operating loss carryforward 16,354 21,853 Capital loss carryforward 28 19,766 Total deferred tax (liabilities) assets (1,137 ) 28,696 Valuation allowance — (2,740 ) Total net deferred tax (liabilities) assets $ (1,137 ) $ 25,956 As of December 31, 2018 , the Company has not recorded a valuation allowance for any portion of its deferred tax assets as it does not believe, at a more likely than not level, that any portion of its deferred tax assets will not be realized. At December 31, 2017 , a $2.7 million valuation allowance was recorded because the Company determined that it was more likely than not that the associated deferred tax assets would not be realized. Of the TRS net operating loss deferred tax asset carryforward of $16.4 million , $2.4 million is scheduled to expire December 31, 2035, $12.3 million is scheduled to expire December 31, 2036, $1.7 million is scheduled to expire December 31, 2037. Based on the Company’s evaluation, it has been concluded that there are no significant uncertain tax positions requiring recognition in the Company’s consolidated financial statements of a contingent tax liability for uncertain tax positions. Additionally, there were no amounts accrued for penalties or interest as of or during the periods presented in these consolidated

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following table presents a reconciliation of the (loss) earnings and shares used in calculating basic and diluted (loss) earnings per share for the years ended December 31, 2018 and 2017 . All per share amounts, common shares outstanding and restricted shares for all periods presented reflect the Company’s one-for-two reverse stock split effected on November 1, 2017 (refer to Note 16 - Stockholders’ Equity for additional information). Year Ended December 31, (in thousands, except share data) 2018 2017 2016 Numerator: Net (loss) income from continuing operations $ (44,290 ) $ 308,239 $ 317,921 Income from discontinued operations, net of tax — 44,146 35,357 Net (loss) income (44,290 ) 352,385 353,278 Income from discontinued operations attributable to noncontrolling interest — 3,814 — Net (loss) income attributable to Two Harbors Investment Corp. (44,290 ) 348,571 353,278 Dividends on preferred stock 65,395 25,122 — Net (loss) income attributable to common stockholders - basic (109,685 ) 323,449 353,278 Interest expense attributable to convertible notes (1) — 17,867 — Net (loss) income attributable to common stockholders - diluted $ (109,685 ) $ 341,316 353,278 Denominator: Weighted average common shares outstanding 204,409,853 173,063,178 172,523,497 Weighted average restricted stock shares 1,610,649 1,370,821 1,513,355 Basic weighted average shares outstanding 206,020,502 174,433,999 174,036,852 Effect of dilutive shares issued in an assumed conversion — 13,699,342 — Diluted weighted average shares outstanding 206,020,502 188,133,341 174,036,852 Basic (Loss) Earnings Per Share: Net (loss) income $ (0.53 ) $ 1.85 $ 2.03 Diluted (Loss) Earnings Per Share: Net (loss) income $ (0.53 ) $ 1.81 $ 2.03 ___________________ (1)

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The following summary provides disclosure of the material transactions with affiliates of the Company. In accordance with the Management Agreement between the Company and PRCM Advisers dated as of October 28, 2009 and subsequently amended, the Company incurred $47.8 million , $40.5 million and $39.3 million as a management fee to PRCM Advisers for the years ended December 31, 2018 , 2017 and 2016 , which represents approximately 1.5% of stockholders’ equity on an annualized basis as defined by the Management Agreement. For purposes of calculating the management fee, stockholders’ equity is adjusted as discussed below, and to exclude the consolidated stockholders’ equity of Granite Point and its subsidiaries previously included in the Company’s consolidated balance sheet and any common stock repurchases, as well as any unrealized gains, losses or other items that do not affect realized net (loss) income , among other adjustments, in accordance with the Management Agreement. In connection with the acquisition of CYS, the Management Agreement was amended to (i) reduce PRCM Advisers’ base management fee with respect to the additional equity under management resulting from the merger to 0.75% from the effective time through the first anniversary of the effective time and (ii) for the fiscal quarter in which closing of the merger occurred, to make a one-time downward adjustment of Pine River’s management fees payable by Two Harbors for such quarter by $15.0 million to offset the cash consideration payable to stockholders of CYS, plus an additional downward adjustment of up to $3.3 million for certain transaction-related expenses. For the year ended December 31, 2018, the total downward adjustment to management fees was $17.5 million . The Company does not anticipate any further downward adjustments to management fees for transaction-related expenses. In addition, the Company reimbursed PRCM Advisers for direct and allocated costs incurred by PRCM Advisers on behalf of the Company. These direct and allocated costs totaled approximately $26.3 million , $27.9 million and $28.4 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. The Company has direct relationships with the majority of its third-party vendors. The Company will continue to have certain costs allocated to it by PRCM Advisers for compensation, data services, technology and certain office lease payments, but most direct expenses with third-party vendors are paid directly by the Company. The Company recognized $13.0 million , $11.3 million and $15.2 million of compensation during the years ended December 31, 2018 , 2017 and 2016 , respectively, related to restricted common stock issued to employees of PRCM Advisers and the Company’s independent directors pursuant to the Plan. During the year ended December 31, 2017, the Company purchased 1,658,008 shares of Granite Point common stock in the open market for a cost of $30.0 million . These equity securities were carried at fair value and reported in other assets on the consolidated balance sheets. As of December 31, 2017 , the carrying value of the equity securities was $29.4 million , which included $0.6 million in unrealized losses. During the year ended December 31, 2018, the Company sold all of the Granite Point common stock it held for $31.2 million , resulting in a realized gain of $1.2 million

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On February 8, 2019, the Company entered into an equity distribution agreement with Credit Suisse Securities (USA) LLC, or Credit Suisse, pursuant to which the Company may offer and sell up to 35,000,000 shares of its common stock from time to time through Credit Suisse. Sales of common stock pursuant to the equity distribution agreement may be made in negotiated transactions or transactions that are deemed to be “at the market” offerings as defined in Rule 415 under the Securities Act of 1933, as amended, including sales made directly on the NYSE or sales made to or through a market maker other than on an exchange. Credit Suisse shall be entitled to total compensation of up to 2% of the gross proceeds from the sale of common stock sold under the equity distribution agreement. On February 8, 2019, the Company provided notice of termination to JMP Securities LLC and Keefe, Bruyette & Woods, Inc. related to the equity distribution agreement dated May 25, 2012, as amended. The Company had previously offered and sold 3,792,935 shares of common stock pursuant to such equity distribution agreement (as adjusted for the one-for-two reverse stock split on November 1, 2017). Events subsequent to December 31, 2018 were evaluated through the date these consolidated

Quarterly Financial Data

Quarterly Financial Data	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information	Quarterly Financial Data - Unaudited 2018 Quarter Ended (in thousands, except share data) March 31 June 30 September 30 December 31 Total interest income $ 194,019 $ 187,360 $ 236,698 $ 251,955 Total interest expense 96,560 108,414 152,396 162,301 Net interest income 97,459 78,946 84,302 89,654 Other-than-temporary impairment losses (94 ) (174 ) (95 ) (107 ) Total other income (loss) 281,982 93,174 112,514 (590,696 ) Total expenses 40,754 38,507 123,366 46,705 Provision for (benefit from) income taxes 3,784 (6,051 ) 37,409 6,681 Dividends on preferred stock 13,747 13,747 18,951 18,950 Net income (loss) attributable to common stockholders $ 321,062 $ 125,743 $ 16,995 $ (573,485 ) Basic earnings per share: Continuing operations $ 1.83 $ 0.72 $ 0.08 $ (2.31 ) Net income (loss) $ 1.83 $ 0.72 $ 0.08 $ (2.31 ) Diluted earnings per share: Continuing operations $ 1.69 $ 0.68 $ 0.08 $ (2.31 ) Net income (loss) $ 1.69 $ 0.68 $ 0.08 $ (2.31 ) 2017 Quarter Ended (in thousands, except share data) March 31 June 30 September 30 December 31 Total interest income $ 169,154 $ 184,741 $ 196,089 $ 195,105 Total interest expense 70,685 85,281 99,427 94,795 Net interest income 98,469 99,460 96,662 100,310 Other-than-temporary impairment losses — (429 ) — (360 ) Total other (loss) income (35,585 ) (57,197 ) 23,060 103,288 Total expenses 28,870 38,614 31,844 30,593 (Benefit from) provision for income taxes (24,517 ) 8,759 (5,342 ) 10,618 Income from discontinued operations (net of noncontrolling), net of tax 13,454 14,157 8,844 3,877 Dividends on preferred stock — 4,285 8,888 11,949 Net income attributable to common stockholders $ 71,985 $ 4,333 $ 93,176 $ 153,955 Basic earnings per share: Continuing operations $ 0.33 $ (0.06 ) $ 0.48 $ 0.86 Discontinued operations 0.08 0.08 0.05 0.02 Net income $ 0.41 $ 0.02 $ 0.53 $ 0.88 Diluted earnings per share: Continuing operations $ 0.33 $ (0.06 ) $ 0.47 $ 0.82 Discontinued operations 0.08 0.08 0.05 0.02 Net income $ 0.41 $ 0.02 $ 0.52 $ 0.84

Basis of Presentation and Sig_2

Basis of Presentation and Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Basis of Presentation and Significant Accounting Policies [Abstract]
Consolidation and Basis of Presentation	Consolidation and Basis of Presentation The accompanying consolidated financial statements include the accounts of all subsidiaries; inter-company accounts and transactions have been eliminated. The accounting and reporting policies of the Company conform to U.S. generally accepted accounting principles, or U.S. GAAP. Certain prior period amounts have been reclassified to conform to the current period presentation. All per share amounts, common shares outstanding and restricted shares for all prior periods presented have been adjusted on a retroactive basis to reflect the Company’s one-for-two reverse stock split effected on November 1, 2017 (refer to Note 16 - Stockholders’ Equity for additional information). Due to its controlling ownership interest in Granite Point through November 1, 2017, the Company consolidated Granite Point on its financial statements. Effective November 1, 2017 (the date the 33.1 million shares of Granite Point common stock were distributed to the Company’s common stockholders), the Company no longer had a controlling interest in Granite Point and, therefore, deconsolidated Granite Point and its subsidiaries from its financial statements and reclassified all of Granite Point’s prior period assets, liabilities and results of operations to discontinued operations. The Company retains debt securities and excess servicing rights purchased from securitization trusts sponsored by either third parties or the Company’s subsidiaries. The securitization trusts are considered variable interest entities, or VIEs, for financial reporting purposes and, thus, are reviewed for consolidation under the applicable consolidation guidance. Whenever the Company has both the power to direct the activities of a trust that most significantly impact the entities’ performance, and the obligation to absorb losses or the right to receive benefits of the entities that could be significant, the Company consolidates the trust. During the majority of 2017, the Company retained the most subordinate security in each of the securitization trusts, which gave the Company the power to direct the activities of the trusts that most significantly impact the trusts’ performance and the obligation to absorb losses or the right to receive benefits of the securitization trusts that could be significant. As a result, the Company consolidated all of the securitization trusts, including the underlying mortgage loans held by the trusts (residential mortgage loans held-for-investment) and the associated debt (collateralized borrowings), on its consolidated balance sheet. During the fourth quarter of 2017, the Company sold all of the retained subordinated securities thereby removing the Company’s power to direct the activities of the trusts and the obligation to absorb losses or the right to receive benefits of the securitization trusts. As a result, the securitization trusts are no longer consolidated on the Company’s consolidated
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make a number of significant estimates. These include estimates of fair value of certain assets and liabilities, amount and timing of credit losses, prepayment rates, the period of time during which the Company anticipates an increase in the fair values of real estate securities sufficient to recover unrealized losses in those securities, and other estimates that affect the reported amounts of certain assets and liabilities as of the date of the consolidated financial statements and the reported amounts of certain revenues and expenses during the reported period. It is likely that changes in these estimates ( e.g.
Available-for-Sale Securities, at Fair Value	Available-for-Sale Securities, at Fair Value The Company invests primarily in mortgage pass-through certificates, collateralized mortgage obligations and other residential mortgage-backed securities representing interests in or obligations backed by pools of mortgage loans (collectively “Agency RMBS”) issued by the Federal National Mortgage Association, or Fannie Mae, the Federal Home Loan Mortgage Corporation, or Freddie Mac, and the Government National Mortgage Association, or Ginnie Mae, or collectively, the government sponsored entities, or GSEs. The Company also invests in securities that are not issued by the GSEs, or non-Agency securities, and, from time to time, U.S. Treasuries. The Company classifies its Agency RMBS and non-Agency securities, excluding inverse interest-only Agency securities classified as derivatives for purposes of U.S. GAAP, as AFS, investments. Although the Company generally intends to hold most of its investment securities until maturity, it may, from time to time, sell any of its investment securities as part of its overall management of its portfolio. Accordingly, the Company classifies all of its securities as AFS, including its interest-only strips, which represent the Company’s right to receive a specified portion of the contractual interest flows of specific Agency or non-Agency securities. All assets classified as AFS, excluding Agency interest-only mortgage-backed securities, are reported at estimated fair value with unrealized gains and losses, excluding other than temporary impairments, included in accumulated other comprehensive income, on an after-tax basis. On July 1, 2015, the Company elected the fair value option for Agency interest-only securities acquired on or after such date. All Agency interest-only securities acquired on or after July 1, 2015 are carried at estimated fair value with changes in fair value, excluding other than temporary impairments, recorded as a component of loss on investment securities in the consolidated statements of comprehensive (loss) income . Fair value is determined under the guidance of Accounting Standards Codification (ASC) 820, Fair Value Measurements and Disclosures, or ASC 820. The Company determines the fair value of its RMBS that are issued or guaranteed as to principal and/or interest by a federally chartered corporation, such as Fannie Mae or Freddie Mac, or an agency of the U.S. government, such as Ginnie Mae (collectively, “Agency RMBS”), based upon prices obtained from third-party pricing providers or broker quotes received using the bid price, which are both deemed indicative of market activity. In determining the fair value of its non-Agency securities, management judgment is used to arrive at fair value that considers prices obtained from third-party pricing providers, broker quotes received and other applicable market data. If listed price data is not available or insufficient, then fair value is based upon internally developed models that are primarily based on observable market-based inputs but also include unobservable market data inputs. See Note 9 - Fair Value of these notes to the consolidated financial statements for details on fair value measurement. Investment securities transactions are recorded on the trade date. The cost basis for realized gains and losses on sales of investment securities are determined on the first-in, first-out, or FIFO, method. Interest income on securities is accrued based on the outstanding principal balance and their contractual terms. Premiums and discounts associated with Agency RMBS and non-Agency securities rated AA and higher at the time of purchase, are amortized into interest income over the life of such securities using the effective yield method. Adjustments to premium amortization are made for actual prepayment activity. The Company estimates prepayments for its Agency interest-only securities, which represent the Company’s right to receive a specified portion of the contractual interest flows of specific Agency securities. As a result, if prepayments increase (or are expected to increase), the Company will accelerate the rate of amortization on the premiums. Interest income on the non-Agency securities that were purchased at a discount to par value and were rated below AA at the time of purchase is recognized based on the security’s effective interest rate. The effective interest rate on these securities is based on the projected cash flows from each security, which are estimated based on the Company’s observation of current information and events and include assumptions related to interest rates, prepayment rates, and the timing and amount of credit losses. On at least a quarterly basis, the Company reviews and, if appropriate, makes adjustments to its cash flow projections based on input and analysis received from external sources, internal models, and its judgment about interest rates, prepayment rates, the timing and amount of credit losses, and other factors. Changes in cash flows from those originally projected, or from those estimated at the last evaluation, may result in a prospective change in the yield/interest income recognized on such securities. Actual maturities of the AFS securities are affected by the contractual lives of the associated mortgage collateral, periodic payments of principal, and prepayments of principal. Therefore actual maturities of AFS securities are generally shorter than stated contractual maturities. Stated contractual maturities are generally greater than ten years. Based on the projected cash flows from the Company’s non-Agency securities purchased at a discount to par value, a portion of the purchase discount may be designated as credit protection against future credit losses and, therefore, not accreted into interest income. The amount designated as credit discount may be adjusted over time, based on the actual performance of the security, its underlying collateral, actual and projected cash flow from such collateral, economic conditions, and other factors. If the performance of a security with a credit discount is more favorable than forecasted, a portion of the amount designated as credit discount may be accreted into interest income prospectively. Conversely, if the performance of a security with a credit discount is less favorable than forecasted, an impairment charge and write-down of such security to a new cost basis results. The Company evaluates its investment securities, on a quarterly basis, to assess whether a decline in the fair value of an AFS security below the Company’s amortized cost basis is an other-than-temporary impairment, or OTTI. The presence of OTTI is based upon a fair value decline below a security’s amortized cost basis and a corresponding adverse change in expected cash flows due to credit related factors as well as non-credit factors, such as changes in interest rates and market spreads. Impairment is considered other-than-temporary if an entity (i) intends to sell the security, (ii) will more likely than not be required to sell the security before it recovers in value, or (iii) does not expect to recover the security’s amortized cost basis, even if the entity does not intend to sell the security. Under these scenarios, the impairment is other-than-temporary and the full amount of impairment should be recognized currently in earnings and the cost basis of the investment security is adjusted. However, if an entity does not intend to sell the impaired debt security and it is more likely than not that it will not be required to sell before recovery, the OTTI is separated into (i) the estimated amount relating to credit loss, or credit component, and (ii) the amount relating to all other factors, or non-credit component. Only the estimated credit loss amount is recognized currently in earnings, with the remainder of the loss amount recognized in other comprehensive (loss) income
Mortgage Servicing Rights, at Fair Value	Mortgage Servicing Rights, at Fair Value The Company’s MSR represent the right to service mortgage loans. The Company and its subsidiaries do not originate or directly service mortgage loans, and instead contract with appropriately licensed subservicers to handle substantially all servicing functions in the name of the subservicer for the loans underlying the Company’s MSR. However, as an owner and manager of MSR, the Company may be obligated to fund advances of principal and interest payments due to third-party owners of the loans, but not yet received from the individual borrowers. These advances are reported as servicing advances within the other assets line item on the consolidated balance sheets. MSR are reported at fair value on the consolidated balance sheets. Although MSR transactions are observable in the marketplace, the valuation includes unobservable market data inputs (prepayment speeds, delinquency levels and discount rates). Changes in the fair value of MSR as well as servicing fee income and servicing expenses are reported on the consolidated statements of comprehensive (loss) income
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents include cash held in bank accounts and cash held in money market funds on an overnight basis.
Restricted Cash	Restricted Cash Restricted cash represents the Company’s cash held by counterparties as collateral against the Company’s securities, certain derivative instruments and/or repurchase agreements. Also included is the cash balance held pursuant to a letter of credit on the New York office lease. Cash held by counterparties as collateral, which resides in non-interest bearing accounts, is not available to the Company for general corporate purposes, but may be applied against amounts due to security, derivative or repurchase counterparties or returned to the Company when the collateral requirements are exceeded or, at the maturity of the derivative or repurchase agreement.
Accrued Interest Receivable	Accrued Interest Receivable Accrued interest receivable represents interest that is due and payable to the Company. Cash interest is generally received within 30 days of recording the receivable.
Due from/to Counterparties, net	Due from/to Counterparties, net Due from counterparties includes cash held by counterparties for payment of principal and interest as well as cash held by counterparties as collateral against certain of the Company’s derivatives and/or repurchase agreements but represents excess capacity and deemed unrestricted and a receivable from the counterparty as of the balance sheet date. Due from counterparties also includes cash receivable from counterparties for sales of MSR pending final transfer and settlement. Due to counterparties includes cash payable by the Company upon settlement of trade positions as well as cash deposited to and held by the Company as collateral against certain of the Company’s derivatives and/or repurchase agreements but represents a payable to the counterparty as of the balance sheet date. Due to counterparties also includes purchase price holdbacks on MSR acquisitions for early prepayment or default provisions, collateral exceptions and other contractual terms.
Derivative Financial Instruments, at Fair Value	Derivative Financial Instruments, at Fair Value In accordance with ASC 815, Derivatives and Hedging, as amended and interpreted, or ASC 815, all derivative financial instruments, whether designated for hedging relationships or not, are recorded on the consolidated balance sheets as assets or liabilities and carried at fair value. At the inception of a derivative contract, the Company determines whether the instrument will be part of a qualifying hedge accounting relationship or whether the Company will account for the contract as a trading instrument. Due to the volatility of the credit markets and difficulty in effectively matching pricing or cash flows, the Company has elected to treat all current derivative contracts as trading instruments. Changes in fair value as well as the accrual and settlement of interest associated with derivatives accounted for as trading instruments are reported in the consolidated statements of comprehensive (loss) income as gain (loss) on interest rate swap, cap and swaption agreements or (loss) gain on other derivative instruments depending on the type of derivative instrument. The Company enters into interest rate derivative contracts for a variety of reasons, including minimizing fluctuations in earnings or market values on certain assets or liabilities that may be caused by changes in interest rates. The Company may, at times, enter into various forward contracts including short securities, Agency to-be-announced securities, or TBAs, options, futures, swaps, and caps. Due to the nature of these instruments, they may be in a receivable/asset position or a payable/liability position at the end of an accounting period. Amounts payable to and receivable from the same party under contracts may be offset as long as the following conditions are met: (a) each of the two parties owes the other determinable amounts; (b) the reporting party has the right to offset the amount owed with the amount owed by the other party; (c) the reporting party intends to offset; and (d) the right of offset is enforceable by law. If the aforementioned conditions are not met, amounts payable to and receivable from are presented by the Company on a gross basis in its consolidated balance sheets. The Company’s centrally cleared interest rate swaps require that the Company posts an “initial margin” amount determined by the clearing exchange, which is generally intended to be set at a level sufficient to protect the exchange from the interest rate swap’s maximum estimated single-day price movement. The Company also exchanges “variation margin” based upon daily changes in fair value, as measured by the exchange. As a result of amendments to rules governing certain central clearing activities, the exchange of variation margin is a settlement of the interest rate swap, as opposed to pledged collateral. Accordingly, beginning in the first quarter of 2018 and in subsequent periods, the Company accounts for the receipt or payment of variation margin on interest rate swaps as a direct reduction to the carrying value of the interest rate swap asset or liability. As of December 31, 2018 and December 31, 2017 , variation margin pledged or received is netted on a counterparty basis and classified within restricted cash, due from counterparties, or due to counterparties on the Company’s consolidated balance sheets. The Company has provided specific disclosure regarding the location and amounts of derivative instruments in the consolidated financial statements and how derivative instruments and related hedged items are accounted for. See Note 7 - Derivative Instruments and Hedging Activities
Repurchase Agreements and Reverse Repurchase Agreements	Repurchase Agreements The Company finances certain of its investment securities and MSR through the use of repurchase agreements. These repurchase agreements are generally short-term debt, which expire within one year. As of December 31, 2018 The Company may borrow U.S. Treasury securities through reverse repurchase transactions under its master repurchase agreements to cover short sales. The Company accounts for these reverse repurchase agreements as securities borrowing transactions and records them at amortized cost, which approximates fair value due to their short-term nature, on its consolidated
Commercial Real Estate Assets (of Discontinued Operations)	Commercial Real Estate Assets (of Discontinued Operations) Due to the Company’s controlling ownership interest in Granite Point through November 1, 2017, its financial condition and results of operations through such date reflect Granite Point’s commercial strategy, which includes as target assets first mortgages, mezzanine loans, B-notes and preferred equity. These commercial real estate assets have been reclassified to assets of discontinued operations on the consolidated balance sheets. Interest income on commercial real estate assets has been reclassified to income from discontinued operations on the consolidated statements of comprehensive (loss) income . The Company’s commercial real estate assets were reported at cost, net of any unamortized acquisition premiums or discounts, loan fees and origination costs as applicable, unless the assets were deemed impaired. No impairments were recorded while these loans were held by the Company.
Federal Home Loan Bank of Des Moines Advances and Stock Holdings	Federal Home Loan Bank of Des Moines Advances and Stock Holdings The Company’s wholly owned subsidiary, TH Insurance Holdings Company LLC, or TH Insurance, is a member of the Federal Home Loan Bank of Des Moines, or the FHLB. As a member of the FHLB, TH Insurance has access to a variety of products and services offered by the FHLB, including secured advances. The Company’s secured advances from the FHLB may have both short-term and long-term maturities. The advances with less than five year terms generally bear interest rates of a spread over one- or three-month LIBOR and the advances with 20-year terms generally bear interest rates of or one- or three-month MOVR, or the FHLB member option variable-rate. FHLB advances are treated as secured financing transactions and are carried at their contractual amounts.
Revolving Credit Facilities	Revolving Credit Facilities To finance MSR, the Company enters into revolving credit facilities collateralized by pledged MSR. Borrowings under these revolving credit facilities that expire within one year are considered short-term debt. As of December 31, 2018
Convertible Senior Notes	Convertible Senior Notes Convertible senior notes include unsecured convertible debt that are carried at their unpaid principal balance, net of any unamortized deferred issuance costs, on the Company’s consolidated
Accrued Interest Payable	Accrued Interest Payable Accrued interest payable represents interest that is due and payable to third parties. Interest is generally paid within 30 days to three months of recording the payable, based upon the Company’s remittance requirements.
Deferred Tax Assets and Liabilities and Income Taxes	Deferred Tax Assets and Liabilities Income recognition for U.S. GAAP and tax differ in certain respects. These differences often reflect differing accounting treatments for tax and U.S. GAAP, such as accounting for discount and premium amortization, credit losses, asset impairments, recognition of certain operating expenses and certain valuation estimates. Some of these differences are temporary in nature and create timing mismatches between when taxable income is earned and the tax is paid versus when the earnings (losses) for U.S. GAAP purposes, or GAAP net (loss) income , are recognized and the tax provision is recorded. Some of these differences are permanent since certain income (or expense) may be recorded for tax purposes but not for U.S. GAAP purposes (or vice-versa). One such significant permanent difference is the Company’s ability as a REIT to deduct dividends paid to stockholders as an expense for tax purposes, but not for U.S. GAAP purposes. As a result of these temporary differences, the Company’s TRSs may recognize taxable income in periods prior or subsequent to when it recognizes income for U.S. GAAP purposes. When this occurs, the TRSs pay or defer the tax liability and establish deferred tax assets or deferred tax liabilities, respectively, for U.S. GAAP purposes. As the income is subsequently realized in future periods under U.S. GAAP, the deferred tax asset is recognized as an expense. Alternatively, as the TRSs realize the deferred taxable income, the deferred tax liability is recognized as a reduction to taxable income. The Company’s deferred tax assets and/or liabilities are generated solely by differences in GAAP net (loss) income and taxable income (loss) at our taxable subsidiaries. U.S. GAAP and tax differences in the REIT may create additional deferred tax assets and/or liabilities to the extent the Company does not distribute all of its taxable income. Income Taxes The Company has elected to be taxed as a REIT under the Code and the corresponding provisions of state law. To qualify as a REIT, the Company must distribute at least 90% of its annual REIT taxable income to stockholders (not including taxable income retained in its taxable subsidiaries) within the time frame set forth in the tax Code and the Company must also meet certain other requirements. In addition, because certain activities, if performed by the Company, may cause the Company to earn income which is not qualifying for the REIT gross income tests, the Company has formed TRSs, as defined in the Code, to engage in such activities. These TRSs’ activities are subject to income taxes as well as any REIT taxable income not distributed to stockholders. The Company assesses its tax positions for all open tax years and determines whether the Company has any material unrecognized liabilities in accordance with ASC 740, Income Taxes . The Company records these liabilities to the extent the Company deems them more likely than not to be incurred. The Company classifies interest and penalties on material uncertain tax positions as interest expense and operating expense, respectively, in its consolidated statements of comprehensive (loss) income . The SEC issued Staff Accounting Bulletin (“SAB 118”), which provides guidance on accounting for tax effects of the Tax Cuts and Jobs Act of 2017 (“TCJA”), which was signed into law on December 22, 2017. SAB 118 provided a measurement period that should not extend beyond one year from the TCJA enactment date for companies to complete the accounting under ASC 740. In accordance with SAB 118, a company must reflect the income tax effects of those aspects of the Act for which the accounting under ASC 740 is complete. To the extent that a company’s accounting for certain income tax effects of the TCJA were incomplete but it was able to determine a reasonable estimate, it was required to record a provisional estimate to be included in the financial statements. . If a company could not determine a provisional estimate to be included in the financial statements, it continued to apply ASC 740 on the basis of the provision of the tax laws that were in effect immediately before the enactment of the TCJA. The TCJA significantly revised the U.S. corporate income tax by, among other things, lowering the federal income tax rate applicable to corporations from 35% to 21% and repealing the corporate alternative minimum tax. In addition, the deduction of net interest expense is limited for all businesses; provided that certain businesses, including real estate businesses, may elect not to be subject to such limitations and instead to depreciate their real property related assets over longer depreciable lives. This limitation could adversely affect our TRSs. The Company recorded a provisional tax provision of $17.5 million in the 2017 financial statements, which was included as a component of income tax expense from continuing operations. This amount represents the remeasurement of federal net deferred tax assets resulting from the permanent reduction in the U.S. statutory corporate tax rate from 35% to 21%
Other Comprehensive Income (Loss)	Other Comprehensive Income (Loss) Current period net unrealized gains and losses on AFS securities, excluding Agency interest-only securities, are reported as components of accumulated other comprehensive income on the consolidated statements of stockholders’ equity and in the consolidated statements of comprehensive (loss) income
Earnings Per Share	Earnings Per Share Basic and diluted (loss) earnings per share are computed by dividing net (loss) income attributable to common stockholders by the weighted average number of common shares and potential common shares outstanding during the period. For both basic and diluted per share calculations, potential common shares represents issued and unvested shares of restricted stock, which have full rights to the common stock dividend declarations of the Company. If the assumed conversion of convertible notes into common shares is dilutive, diluted (loss) earnings per share is adjusted by adding back the periodic interest expense (net of any tax effects) associated with dilutive convertible notes to net (loss) income attributable to common stockholders and adding the shares issued in an assumed conversion to the diluted weighted average share count. All per share amounts, common shares outstanding and restricted shares for all periods presented reflect the Company’s one-for-two reverse stock split effected on November 1, 2017 (refer to Note 16 - Stockholders’ Equity
Equity Incentive Plan	Equity Incentive Plan The Company’s Second Restated 2009 Equity Incentive Plan, or the Plan, provides incentive compensation to attract and retain qualified directors, officers, advisors, consultants and other personnel, including PRCM Advisers and its affiliates. The Plan is administered by the compensation committee of the Company’s board of directors. The Plan permits the granting of restricted shares of common stock, phantom shares, dividend equivalent rights and other equity-based awards. See Note 17 - Equity Incentive Plan for further details regarding the Plan.
Asset Acquisition	Asset Acquisition In accordance with U.S. GAAP, the acquirer in a merger transaction is to evaluate whether substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets. If that threshold is met, the set of acquired assets and associated activities is not deemed a business and is required to be accounted for as an asset acquisition. Upon completion of the merger with CYS on July 31, 2018, approximately 89% of the CYS assets acquired were Agency RMBS. The Company concluded that they were similar identifiable assets to be grouped to evaluate whether the “substantially all” threshold was met as the Agency RMBS are financial assets with similar risk characteristics associated with managing these assets. Given the concentration of the fair value of the Agency RMBS of the gross assets acquired, the Company concluded that the fair value of the gross assets acquired was concentrated in a group of similar identifiable assets and, therefore, the merger was accounted for as an asset acquisition. The financial results of CYS since the closing date of the acquisition have been included in the Company’s consolidated financial statements. Asset acquisitions are generally accounted for by allocating the cost of the acquisition plus direct transaction costs to the individual assets acquired, including identified intangible assets, and liabilities assumed on a relative fair value basis. This allocation may cause identified assets to be recognized at amounts that are greater than their fair values. However, “non-qualifying” assets, which include financial assets and other current assets, should not be assigned an amount greater than their fair value. The gross assets acquired in the merger consisted most significantly of financial assets and other current assets. The cost of the acquisition of CYS plus direct transaction costs exceeded gross assets acquired less liabilities assumed in the merger. As there were no meaningful nonfinancial assets and non-current assets in this transaction and no identified intangible assets to assign value, the excess consideration and transaction costs were recognized in the consolidated statements of comprehensive (loss) income
Recently Issued and/or Adopted Accounting Standards	Recently Issued and/or Adopted Accounting Standards Revenue from Contracts with Customers In May 2014, the Financial Accounting Standards Board, or FASB, issued ASU No. 2014-09, which is a comprehensive revenue recognition standard that supersedes virtually all existing revenue guidance under U.S. GAAP. The standard’s core principle is that an entity will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. As a result of the issuance of ASU No. 2015-14 in August 2015 deferring the effective date of ASU No. 2014-09 by one year, the ASU is effective for annual periods, and interim periods within those annual periods, beginning on or after December 15, 2017, with early adoption prohibited. The Company has evaluated the new guidance and determined that interest income, gains and losses on financial instruments and income from servicing residential mortgage loans are outside the scope of ASC 606, Revenues from Contracts with Customers , or ASC 606. For income from servicing residential mortgage loans, the Company considered that the FASB Transition Resource Group members generally agreed that an entity should look to ASC 860, Transfers and Servicing , to determine the appropriate accounting for these fees and ASC 606 contains a scope exception for contracts that fall under ASC 860. As a result, the adoption of this ASU did not have a material impact on the Company’s financial condition, results of operations or financial statement disclosures. Lease Classification and Accounting In February 2016, the FASB issued ASU No. 2016-02, which requires lessees to recognize on their balance sheets both a lease liability for the obligation to make lease payments and a right-of-use asset for the right to use the underlying asset for the lease term. The ASU is effective for annual periods, and interim periods within those annual periods, beginning on or after December 15, 2018, with early adoption permitted. The Company has determined this ASU will not have a material impact on the Company’s financial condition, results of operations or financial statement disclosures. Measurement of Credit Losses on Financial Instruments In June 2016, the FASB issued ASU No. 2016-13, which changes the impairment model for most financial assets and certain other instruments. Valuation allowances for credit losses on AFS debt securities will be recognized, rather than direct reductions in the amortized cost of the investments, regardless of whether the impairment is considered to be other-than-temporary. The new model also requires the estimation of lifetime expected credit losses and corresponding recognition of allowance for losses on trade and other receivables, held-to-maturity debt securities, loans, and other instruments held at amortized cost. The ASU requires certain recurring disclosures and is effective for annual periods, and interim periods within those annual periods, beginning on or after December 15, 2019, with early adoption permitted for annual periods, and interim periods within those annual periods, beginning on or after December 15, 2018. The Company is evaluating the adoption of this ASU to determine the impact it may have on its consolidated financial statements, which at the date of adoption, will establish an allowance for credit losses on AFS securities which will be derived from the current designated credit reserve with a resulting increase to amortized cost on the securities. The Company also expects adoption of this ASU to impact the recording for the purchase of certain non-Agency securities with purchased credit deterioration by recording an allowance for credit losses with an increase in amortized cost above the purchase price of the same amount. Subsequent changes in expected credit losses will be recognized immediately in earnings as a provision for credit losses until the allowance is reduced to zero. Further favorable changes will result in prospective yield adjustments. Clarifying the Definition of a Business In January 2017, the FASB issued ASU No. 2017-01, which changes the definition of a business to assist entities with evaluating when a set of transferred assets and activities is a business. The ASU requires an entity to evaluate if substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets; if so, the set of transferred assets and activities is not a business. The guidance also requires a business to include at least one substantive process and narrows the definition of outputs by more closely aligning it with how outputs are described in ASC 606. The ASU is effective for annual periods, and interim periods within those annual periods, beginning on or after December 15, 2017, with early adoption permitted. The Company’s adoption of this ASU impacted how the Company accounted for the acquisition of CYS (see discussion above). Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income In February 2018, the FASB issued ASU No. 2018-02, which permits entities to reclassify tax effects stranded in accumulated other comprehensive income as a result of the Tax Cuts and Jobs Act, or TCJA, to retained earnings and requires entities to disclose whether or not they elected to reclassify the tax effects related to the TCJA as well as their policy for releasing income tax effects from accumulated other comprehensive income. The ASU is effective for annual periods, and interim periods within those annual periods, beginning on or after December 15, 2018, with early adoption permitted. Early adoption of this ASU was elected and applied by recording a cumulative-effect adjustment of $9.9 million to retained earnings, with the offsetting impact to accumulated other comprehensive income as of January 1, 2018. Accounting for Share-Based Payments to Nonemployees In June 2018, the FASB issued ASU No. 2018-07 to simplify the accounting for share-based payments to nonemployees by aligning it with the accounting for share-based payments to employees, with certain exceptions. Under the guidance, equity-classified nonemployee awards will be measured on and fixed at the grant date, rather than measured at fair value at each reporting date until the date at which the nonemployee’s performance is complete. The ASU is effective for annual periods, and interim periods within those annual periods, beginning on or after December 15, 2018, with early adoption permitted. Early adoption of this ASU was elected on July 1, 2018 and applied by recording a cumulative-effect adjustment to retained earnings as of January 1, 2018, which did not have a material impact on the Company’s financial condition, results of operations or financial statement disclosures. Fair Value Measurement Disclosure Requirements In August 2018, the FASB issued ASU No. 2018-13, which eliminates, adds and modifies certain disclosure requirements for fair value measurements. Under the guidance, entities are no longer required to disclose the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, but public companies are required to disclose (1) the changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements of instruments held at the end of the reporting period and (2) the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. The ASU is effective for annual periods, and interim periods within those annual periods, beginning on or after December 15, 2019, with early adoption permitted. Early adoption of this ASU did not have an impact on the Company’s financial condition or results of operations but resulted in some modified financial statement disclosures. SEC Disclosure Update and Simplification

Acquisition of CYS Investment_2

Acquisition of CYS Investments, Inc. (Tables)	12 Months Ended
	Dec. 31, 2018
Acquisition of CYS Investments, Inc. [Abstract]
Schedule of the calculation of the purchase price of CYS Investments, Inc.	The total purchase price for the merger of $1.4 billion consists primarily of Two Harbors common stock issued in exchange for shares of CYS common stock and was calculated based on the $15.50 closing price of Two Harbors common stock on July 31, 2018. (dollars in thousands, except per share prices) July 31, Common Stock Exchange: CYS common stock outstanding 155,102,543 Common exchange ratio 0.4680 Two Harbors common stock to be issued 72,587,990 Less: fractional shares 218 Two Harbors common stock issued 72,587,772 Two Harbors share price $ 15.50 $ 1,125,114 Cash in Lieu of Common Stock: Fractional shares 218 Cash in lieu rate $ 15.59 $ 3 Per Share Cash Consideration: CYS common stock outstanding 155,102,543 Per share cash consideration 0.0965 $ 14,967 Preferred Stock Exchange: Shares Series D preferred stock 3,000,000 $ 75,000 Series E preferred stock 8,000,000 $ 200,000 Total Purchase Price $ 1,415,084
Schedule of recognized identified assets acquired and liabilities assumed in acquisition of CYS Investments, Inc.	The total purchase price for the merger including direct transaction costs, which exceeded gross assets acquired less liabilities assumed in the merger, was allocated to the individual assets acquired and liabilities assumed on a relative fair value basis, as shown below: (in thousands) July 31, Assets: Available-for-sale securities, at fair value $ 10,034,557 Cash and cash equivalents 386 Restricted cash 1,062 Accrued interest receivable 30,646 Due from counterparties 21,572 Derivative assets, at fair value 314,811 Reverse repurchase agreements 761,460 Other assets 11,947 Total Assets $ 11,176,441 Liabilities: Repurchase agreements $ 8,743,527 Derivative liabilities, at fair value 765,837 Due to counterparties 301,287 Accrued interest payable 27,487 Other liabilities 821 Total Liabilities 9,838,959 Stockholders’ Equity Cumulative deficit (acquisition transaction costs) (77,602 ) Total Stockholders’ Equity $ (77,602 ) Total Purchase Price $ 1,415,084

Available-for-Sale Securities_2

Available-for-Sale Securities, at Fair Value (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale	The following table presents the Company’s AFS investment securities by collateral type as of December 31, 2018 and December 31, 2017 : (in thousands) December 31, December 31, Agency Federal National Mortgage Association $ 15,812,696 $ 13,920,721 Federal Home Loan Mortgage Corporation 4,930,963 3,616,967 Government National Mortgage Association 941,374 701,037 Non-Agency 3,867,571 2,982,094 Total available-for-sale securities $ 25,552,604 $ 21,220,819
Schedule of Available-for-sale Securities Reconciliation	The following tables present the amortized cost and carrying value of AFS securities by collateral type as of December 31, 2018 and December 31, 2017 : December 31, 2018 (in thousands) Principal/ Current Face Un-amortized Premium Accretable Purchase Discount Credit Reserve Purchase Discount Amortized Cost Unrealized Gain Unrealized Loss Carrying Value Agency Principal and interest $ 20,775,790 $ 1,037,781 $ (25,085 ) $ — $ 21,788,486 $ 61,128 $ (339,997 ) $ 21,509,617 Interest-only 3,115,967 209,901 — — 209,901 14,170 (48,655 ) 175,416 Total Agency 23,891,757 1,247,682 (25,085 ) — 21,998,387 75,298 (388,652 ) 21,685,033 Non-Agency Principal and interest 5,360,124 6,682 (694,119 ) (1,322,762 ) 3,349,925 478,095 (44,657 ) 3,783,363 Interest-only 5,137,169 83,846 — — 83,846 3,655 (3,293 ) 84,208 Total Non-Agency 10,497,293 90,528 (694,119 ) (1,322,762 ) 3,433,771 481,750 (47,950 ) 3,867,571 Total $ 34,389,050 $ 1,338,210 $ (719,204 ) $ (1,322,762 ) $ 25,432,158 $ 557,048 $ (436,602 ) $ 25,552,604 December 31, 2017 (in thousands) Principal/ Current Face Un-amortized Premium Accretable Purchase Discount Credit Reserve Purchase Discount Amortized Cost Unrealized Gain Unrealized Loss Carrying Value Agency Principal and interest $ 17,081,849 $ 1,079,246 $ (24,638 ) $ — $ 18,136,457 $ 42,149 $ (134,969 ) $ 18,043,637 Interest-only 2,941,772 223,289 — — 223,289 10,955 (39,156 ) 195,088 Total Agency 20,023,621 1,302,535 (24,638 ) — 18,359,746 53,104 (174,125 ) 18,238,725 Non-Agency Principal and interest 3,758,134 2,757 (676,033 ) (653,613 ) 2,431,245 488,931 (3,166 ) 2,917,010 Interest-only 5,614,925 65,667 — — 65,667 2,163 (2,746 ) 65,084 Total Non-Agency 9,373,059 68,424 (676,033 ) (653,613 ) 2,496,912 491,094 (5,912 ) 2,982,094 Total $ 29,396,680 $ 1,370,959 $ (700,671 ) $ (653,613 ) $ 20,856,658 $ 544,198 $ (180,037 ) $ 21,220,819
Debt Securities, Available-for-sale, Classified by Rate Type	The following tables present the carrying value of the Company’s AFS securities by rate type as of December 31, 2018 and December 31, 2017 : December 31, 2018 (in thousands) Agency Non-Agency Total Adjustable Rate $ 19,073 $ 3,475,171 $ 3,494,244 Fixed Rate 21,665,960 392,400 22,058,360 Total $ 21,685,033 $ 3,867,571 $ 25,552,604 December 31, 2017 (in thousands) Agency Non-Agency Total Adjustable Rate $ 23,220 $ 2,622,710 $ 2,645,930 Fixed Rate 18,215,505 359,384 18,574,889 Total $ 18,238,725 $ 2,982,094 $ 21,220,819
Debt Securities, Available-for-sale, Weighted Average Life Classifications	The following table presents the Company’s AFS securities according to their estimated weighted average life classifications as of December 31, 2018 : December 31, 2018 (in thousands) Agency Non-Agency Total ≤ 1 year $ 6,301 $ 97,955 $ 104,256 > 1 and ≤ 3 years 124,121 135,457 259,578 > 3 and ≤ 5 years 260,886 428,851 689,737 > 5 and ≤ 10 years 19,550,827 2,582,835 22,133,662 > 10 years 1,742,898 622,473 2,365,371 Total $ 21,685,033 $ 3,867,571 $ 25,552,604
Schedule of Available-for-sale Securities Reconciliation, Non-Agency Unamortized Net Discount and Designated Credit Reserves	The following table presents the changes for the years ended December 31, 2018 and 2017 of the net unamortized discount/premium and designated credit reserves on non-Agency AFS securities. Year Ended December 31, 2018 2017 (in thousands) Designated Credit Reserve Net Unamortized Discount/Premium Total Designated Credit Reserve Net Unamortized Discount/Premium Total Beginning balance at January 1 $ (653,613 ) $ (607,609 ) $ (1,261,222 ) $ (367,437 ) $ (623,440 ) $ (990,877 ) Acquisitions (737,765 ) (60,894 ) (798,659 ) (373,051 ) (57,732 ) (430,783 ) Accretion of net discount — 89,111 89,111 — 88,037 88,037 Realized credit losses 26,457 — 26,457 17,539 — 17,539 Reclassification adjustment for other-than-temporary impairments (470 ) — (470 ) (789 ) — (789 ) Transfers from (to) 42,629 (42,629 ) — 66,537 (66,537 ) — Sales, calls, other — 18,430 18,430 3,588 52,063 55,651 Ending balance at December 31 $ (1,322,762 ) $ (603,591 ) $ (1,926,353 ) $ (653,613 ) $ (607,609 ) $ (1,261,222 )
Schedule of Unrealized Loss on Investments	The following table presents the components comprising the carrying value of AFS securities not deemed to be other than temporarily impaired by length of time that the securities had an unrealized loss position as of December 31, 2018 and December 31, 2017 . At December 31, 2018 , the Company held 1,550 AFS securities, of which 290 were in an unrealized loss position for less than twelve consecutive months and 489 were in an unrealized loss position for more than twelve consecutive months. At December 31, 2017 , the Company held 1,435 AFS securities, of which 253 were in an unrealized loss position for less than twelve consecutive months and 234 were in an unrealized loss position for more than twelve consecutive months. Of the $4.4 billion and $12.2 billion of AFS securities in an unrealized loss position for less than twelve consecutive months as of December 31, 2018 and December 31, 2017 , $3.1 billion , or 71.1% , and $12.0 billion , or 98.5% , respectively, were Agency AFS securities, whose principal and interest are guaranteed by the GSEs. Unrealized Loss Position for Less than 12 Months 12 Months or More Total (in thousands) Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses December 31, 2018 $ 4,386,946 $ (66,520 ) $ 9,501,123 $ (370,082 ) $ 13,888,069 $ (436,602 ) December 31, 2017 $ 12,198,870 $ (65,313 ) $ 2,464,544 $ (114,724 ) $ 14,663,414 $ (180,037 )
Other than Temporary Impairment, Credit Losses Recognized in Earnings	The following table presents the changes in OTTI included in earnings for the years ended December 31, 2018 , 2017 and 2016 : Year Ended December 31, (in thousands) 2018 2017 2016 Cumulative credit loss at beginning of period $ (6,395 ) $ (5,606 ) $ (6,499 ) Additions: Other-than-temporary impairments not previously recognized (264 ) (429 ) (1,307 ) Increases related to other-than-temporary impairments on securities with previously recognized other-than-temporary impairments (206 ) (360 ) (515 ) Reductions: Decreases related to other-than-temporary impairments on securities paid down — — 1,387 Decreases related to other-than-temporary impairments on securities sold — — 1,328 Cumulative credit loss at end of period $ (6,865 ) $ (6,395 ) $ (5,606 )
Schedule of Realized Gain (Loss)	The following table presents the gross realized gains and losses on sales of AFS securities for the years ended December 31, 2018 , 2017 and 2016 : Year Ended December 31, (in thousands) 2018 2017 2016 Gross realized gains $ 70,076 $ 67,764 $ 97,049 Gross realized losses (419,638 ) (100,255 ) (223,277 ) Total realized losses on sales, net $ (349,562 ) $ (32,491 ) $ (126,228 )

Servicing Activities (Tables)

Servicing Activities (Tables)	12 Months Ended
	Dec. 31, 2018
Disclosures Pertaining to Servicing Assets and Servicing Liabilities [Abstract]
Schedule of Servicing Assets at Fair Value	The following table summarizes activity related to MSR for the years ended December 31, 2018 , 2017 and 2016 . Year Ended December 31, (in thousands) 2018 2017 2016 Balance at beginning of period $ 1,086,717 $ 693,815 $ 493,688 Additions from purchases of mortgage servicing rights 988,283 499,866 312,580 Additions from sales of residential mortgage loans — 20 924 Subtractions from sales of mortgage servicing rights — (946 ) (61,511 ) Changes in fair value due to: Changes in valuation inputs or assumptions used in the valuation model 80,209 6,339 16,572 Other changes in fair value (1) (149,879 ) (96,781 ) (78,729 ) Other changes (2) (11,890 ) (15,596 ) 10,291 Balance at end of period $ 1,993,440 $ 1,086,717 $ 693,815 ____________________ (1) Other changes in fair value primarily represents changes due to the realization of expected cash flows. (2) Other changes includes purchase price adjustments, contractual prepayment protection, and changes due to the Company’s purchase of the underlying collateral.
Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets	As of December 31, 2018 and December 31, 2017 , the key economic assumptions and sensitivity of the fair value of MSR to immediate 10% and 20% adverse changes in these assumptions were as follows: (dollars in thousands) December 31, December 31, Weighted average prepayment speed: 8.6 % 9.8 % Impact on fair value of 10% adverse change $ (67,245 ) $ (40,100 ) Impact on fair value of 20% adverse change $ (130,371 ) $ (77,483 ) Weighted average delinquency: 1.3 % 1.7 % Impact on fair value of 10% adverse change $ (6,911 ) $ (4,274 ) Impact on fair value of 20% adverse change $ (13,688 ) $ (8,875 ) Weighted average discount rate: 9.4 % 9.9 % Impact on fair value of 10% adverse change $ (62,528 ) $ (35,137 ) Impact on fair value of 20% adverse change $ (121,135 ) $ (68,246 )
Components of Servicing Revenue	The following table presents the components of servicing income recorded on the Company’s consolidated statements of comprehensive (loss) income for the years ended December 31, 2018 , 2017 and 2016 : Year Ended December 31, (in thousands) 2018 2017 2016 Servicing fee income $ 312,100 $ 197,902 $ 138,430 Ancillary and other fee income 1,280 1,009 1,631 Float income 29,716 10,154 3,518 Total $ 343,096 $ 209,065 $ 143,579
Schedule of Total Serviced Mortgage Assets	The following table presents the number of loans and unpaid principal balance of the mortgage assets for which the Company manages the servicing as of December 31, 2018 and December 31, 2017 : December 31, 2018 December 31, 2017 (dollars in thousands) Number of Loans Unpaid Principal Balance Number of Loans Unpaid Principal Balance Mortgage servicing rights 717,167 $ 163,102,308 454,028 $ 101,344,054 Residential mortgage loans in securitization trusts 3,612 2,392,471 3,845 2,618,016 Other assets 220 34,374 260 40,222 Total serviced mortgage assets 720,999 $ 165,529,153 458,133 $ 104,002,292

Cash, Cash Equivalents and Re_2

Cash, Cash Equivalents and Restricted Cash (Tables)	12 Months Ended
	Dec. 31, 2018
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Schedule of Restricted Cash and Cash Equivalents	The following table presents the Company’s restricted cash balances as of December 31, 2018 and December 31, 2017 : (in thousands) December 31, December 31, Restricted cash balances held by trading counterparties: For securities and loan trading activity $ 51,350 $ 27,050 For derivatives trading activity 219,900 191,421 As restricted collateral for repurchase agreements and Federal Home Loan Bank advances 416,696 417,018 Total restricted cash balances held by trading counterparties 687,946 635,489 Restricted cash balance pursuant to letter of credit on office lease 60 347 Total $ 688,006 $ 635,836
Schedule of Cash, Cash Equivalents and Restricted Cash	The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported on the Company’s consolidated balance sheets as of December 31, 2018 and December 31, 2017 that sum to the total of the same such amounts shown in the statements of cash flows: (in thousands) December 31, December 31, Cash and cash equivalents $ 409,758 $ 419,159 Restricted cash 688,006 635,836 Total cash, cash equivalents and restricted cash $ 1,097,764 $ 1,054,995

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The following tables present the gross fair value and notional amounts of the Company’s derivative financial instruments treated as trading derivatives as of December 31, 2018 and December 31, 2017 . December 31, 2018 Derivative Assets Derivative Liabilities (in thousands) Fair Value Notional Fair Value Notional Inverse interest-only securities $ 70,813 $ 476,299 $ — $ — Interest rate swap agreements 187,231 26,798,605 — 2,725,000 Interest rate cap contracts 40,335 2,500,000 — — Swaptions, net — — (13,456 ) 63,000 TBAs 21,602 6,484,000 — — Put and call options for TBAs, net — — (25,296 ) 1,767,000 Markit IOS total return swaps — — (383 ) 48,265 Short U.S. Treasuries — — (781,455 ) 800,000 Total $ 319,981 $ 36,258,904 $ (820,590 ) $ 5,403,265 December 31, 2017 Derivative Assets Derivative Liabilities (in thousands) Fair Value Notional Fair Value Notional Inverse interest-only securities $ 91,827 $ 588,246 $ — $ — Interest rate swap agreements 206,773 21,516,125 (29,867 ) 6,966,000 Swaptions, net 10,405 2,666,000 — — TBAs 913 733,000 (1,930 ) 1,306,000 Markit IOS total return swaps — — (106 ) 63,507 Total $ 309,918 $ 25,503,371 $ (31,903 ) $ 8,335,507
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance	The following table summarizes the location and amount of gains and losses on derivative instruments reported in the consolidated statements of comprehensive (loss) income : Derivative Instruments Location of Gain (Loss) Recognized in Income on Derivatives Amount of Gain (Loss) Recognized in Income on Derivatives Year Ended (in thousands) December 31, 2018 2017 2016 Interest rate risk management TBAs (Loss) gain on other derivative instruments $ (12,521 ) $ (46,778 ) $ 51,816 Short U.S. Treasuries (Loss) gain on other derivative instruments (26,988 ) — — Put and call options for TBAs (Loss) gain on other derivative instruments (18,457 ) (22,623 ) 64,920 Interest rate swaps - Payers Gain (loss) on interest rate swap, cap and swaption agreements 48,995 67,124 (3,110 ) Interest rate swaps - Receivers Gain (loss) on interest rate swap, cap and swaption agreements (74,407 ) (17,677 ) 37,272 Swaptions Gain (loss) on interest rate swap, cap and swaption agreements 45,954 (59,200 ) 11,209 Interest rate caps Gain (loss) on interest rate swap, cap and swaption agreements (4,499 ) — — Markit IOS total return swaps (Loss) gain on other derivative instruments 125 (870 ) (36,898 ) Credit risk management Credit default swaps - Receive protection (Loss) gain on other derivative instruments — — 962 Non-risk management Inverse interest-only securities (Loss) gain on other derivative instruments 2,984 112 18,579 Forward purchase commmitments (Loss) gain on other derivative instruments — — 2,418 Total $ (38,814 ) $ (79,912 ) $ 147,168
Schedule of Notional Amounts of Outstanding Derivative Positions	The following tables present information with respect to the volume of activity in the Company’s derivative instruments during the years ended December 31, 2018 and 2017 : Year Ended December 31, 2018 (in thousands) Beginning of Period Notional Amount Additions Settlement, Termination, Expiration or Exercise End of Period Notional Amount Average Notional Amount Realized Gain (Loss), net (1) Inverse interest-only securities $ 588,246 $ — $ (111,947 ) $ 476,299 $ 530,509 $ — Interest rate swap agreements 28,482,125 49,269,781 (48,228,301 ) 29,523,605 28,317,793 (71,578 ) Interest rate cap contracts — 2,500,000 — 2,500,000 1,054,795 — Swaptions, net 2,666,000 (35,000 ) (2,568,000 ) 63,000 (1,495,421 ) 67,985 TBAs, net (573,000 ) 64,988,000 (57,931,000 ) 6,484,000 4,502,888 (35,140 ) Short U.S. Treasuries — (800,000 ) — (800,000 ) (337,534 ) — Put and call options for TBAs, net — (451,000 ) (1,316,000 ) (1,767,000 ) (804,997 ) 6,839 Markit IOS total return swaps 63,507 — (15,242 ) 48,265 55,143 (765 ) Total $ 31,226,878 $ 115,471,781 $ (110,170,490 ) $ 36,528,169 $ 31,823,176 $ (32,659 ) Year Ended December 31, 2017 (in thousands) Beginning of Period Notional Amount Additions Settlement, Termination, Expiration or Exercise End of Period Notional Amount Average Notional Amount Realized Gain (Loss), net (1) Inverse interest-only securities $ 740,844 $ — $ (152,598 ) $ 588,246 $ 662,273 $ (40 ) Interest rate swap agreements 20,371,063 36,642,245 (28,531,183 ) 28,482,125 19,447,067 54,476 Swaptions, net 225,000 4,306,000 (1,865,000 ) 2,666,000 1,014,578 8,694 TBAs, net (1,489,000 ) (7,249,400 ) 8,165,400 (573,000 ) (1,256,424 ) (51,810 ) Put and call options for TBAs, net (1,136,000 ) 4,460,000 (3,324,000 ) — 11,978 20,010 Markit IOS total return swaps 90,593 — (27,086 ) 63,507 74,183 (181 ) Total $ 18,802,500 $ 38,158,845 $ (25,734,467 ) $ 31,226,878 $ 19,953,655 $ 31,149 ____________________ (1)
Schedule of TBA Positions	The following tables present the notional amount, cost basis, market value and carrying value (which approximates fair value) of the Company’s TBA positions as of December 31, 2018 and December 31, 2017 : December 31, 2018 Net Carrying Value (4) (in thousands) Notional Amount (1) Cost Basis (2) Market Value (3) Derivative Assets Derivative Liabilities Purchase contracts $ 6,484,000 $ 6,734,858 $ 6,756,460 $ 21,602 $ — Sale contracts — — — — — TBAs, net $ 6,484,000 $ 6,734,858 $ 6,756,460 $ 21,602 $ — December 31, 2017 Net Carrying Value (4) (in thousands) Notional Amount (1) Cost Basis (2) Market Value (3) Derivative Assets Derivative Liabilities Purchase contracts $ 733,000 $ 769,446 $ 770,359 $ 913 $ — Sale contracts (1,306,000 ) (1,316,368 ) (1,318,297 ) — (1,930 ) TBAs, net $ (573,000 ) $ (546,922 ) $ (547,938 ) $ 913 $ (1,930 ) ___________________ (1) Notional amount represents the face amount of the underlying Agency RMBS. (2) Cost basis represents the forward price to be paid (received) for the underlying Agency RMBS. (3) Market value represents the current market value of the TBA (or of the underlying Agency RMBS) as of period-end. (4) Net carrying value represents the difference between the market value of the TBA as of period-end and its cost basis, and is reported in derivative assets / (liabilities), at fair value, in the consolidated
Schedule of Interest Rate Swap Payers	As of December 31, 2018 and December 31, 2017 , the Company held the following interest rate swaps that were utilized as economic hedges of interest rate exposure (or duration) whereby the Company receives interest at a three-month LIBOR rate: (notional in thousands) December 31, 2018 Swaps Maturities Notional Amount (1) Weighted Average Fixed Pay Rate (2) Weighted Average Receive Rate (2) Weighted Average Maturity (Years) (2) 2019 $ 4,336,897 1.769 % 2.565 % 0.79 2020 3,640,000 1.806 % 2.689 % 1.83 2021 4,117,000 1.550 % 2.687 % 2.69 2022 2,470,000 2.002 % 2.728 % 3.75 2023 and Thereafter 6,842,270 2.495 % 2.636 % 7.60 Total $ 21,406,167 1.978 % 2.651 % 3.75 (notional in thousands) December 31, 2017 Swaps Maturities Notional Amount (1) Weighted Average Fixed Pay Rate (2) Weighted Average Receive Rate (2) Weighted Average Maturity (Years) (2) 2018 $ 4,320,000 1.155 % 1.508 % 0.50 2019 5,448,135 1.767 % 1.386 % 1.79 2020 5,490,000 1.945 % 1.509 % 2.87 2021 2,417,000 1.788 % 1.628 % 3.92 2022 and Thereafter 5,245,000 1.764 % 1.516 % 6.44 Total $ 22,920,135 1.694 % 1.493 % 3.01 ____________________ (1) Notional amount includes $572.0 million and $570.0 million in forward starting interest rate swaps as of December 31, 2018 and December 31, 2017 , respectively. (2) Weighted averages exclude forward starting interest rate swaps. As of December 31, 2018 and December 31, 2017 , the weighted average fixed pay rate on forward starting interest rate swaps was 2.8% and 2.1% , respectively.
Schedule of Interest Rate Swap Receivers	Additionally, as of December 31, 2018 and December 31, 2017 , the Company held the following interest rate swaps in order to mitigate mortgage interest rate exposure (or duration) risk whereby the Company pays interest at a three-month LIBOR rate: (notional in thousands) December 31, 2018 Swaps Maturities Notional Amounts Weighted Average Pay Rate Weighted Average Fixed Receive Rate Weighted Average Maturity (Years) 2020 $ 250,000 2.469 % 2.258 % 1.06 2021 $ 2,477,438 2.538 % 2.736 % 2.24 2022 800,000 2.653 % 2.975 % 3.39 2023 and Thereafter 4,590,000 2.653 % 2.757 % 7.37 Total $ 8,117,438 2.612 % 2.757 % 5.22 (notional in thousands) December 31, 2017 Swaps Maturities Notional Amounts Weighted Average Pay Rate Weighted Average Fixed Receive Rate Weighted Average Maturity (Years) 2020 $ 200,000 1.391 % 1.642 % 2.60 2021 500,000 1.357 % 1.327 % 3.05 2022 and Thereafter 4,861,990 1.475 % 2.325 % 8.34 Total $ 5,561,990 1.462 % 2.211 % 7.66
Schedule of Interest Rate Swaptions	As of December 31, 2018 and December 31, 2017 , the Company had the following outstanding interest rate swaptions that were utilized as macro-economic hedges: December 31, 2018 (notional and dollars in thousands) Option Underlying Swap Swaption Expiration Cost Basis Fair Value Average Months to Expiration Notional Amount Average Pay Rate Average Receive Rate Average Term (Years) Purchase contracts: Payer < 6 Months $ 4,855 $ 2,430 5.13 $ 900,000 3.16 % 3M Libor 10.0 Payer ≥ 6 Months 8,400 5,992 8.60 800,000 3.14 % 3M Libor 10.0 Total Payer $ 13,255 $ 8,422 7.92 $ 1,700,000 3.15 % 3M Libor 10.0 Sale contracts: Receiver < 6 Months $ (4,855 ) $ (9,001 ) 4.74 $ (845,000 ) 3M Libor 2.66 % 10.0 Receiver ≥ 6 Months $ (8,400 ) $ (12,877 ) 8.60 $ (792,000 ) 3M Libor 2.64 % 10.0 Total Receiver $ (13,255 ) $ (21,878 ) 7.52 $ (1,637,000 ) 3M Libor 2.65 % 10.0 December 31, 2017 (notional and dollars in thousands) Option Underlying Swap Swaption Expiration Cost Fair Value Average Months to Expiration Notional Amount Average Fixed Pay Rate Average Receive Rate Average Term (Years) Purchase contracts: Payer < 6 Months $ 21,380 $ 17,736 4.03 $ 7,200,000 2.27 % 3M Libor 3.8 Receiver < 6 Months $ 4,660 $ 2,982 3.72 $ 2,300,000 3M Libor 2.10 % 10.0 Sale contracts: Payer < 6 Months $ (7,950 ) $ (5,619 ) 4.66 $ (1,693,000 ) 2.70 % 3M Libor 10.0 Receiver < 6 Months $ (16,260 ) $ (4,694 ) 5.17 $ (5,141,000 ) 3M Libor 1.89 % 5.6
Schedule of Interest Rate Caps [Table Text Block]	As of December 31, 2018 , the Company held the following interest rate caps that were utilized as economic hedges of interest rate exposure (or duration) whereby the Company receives interest at a three-month LIBOR rate, net of a fixed cap rate: (notional in thousands) December 31, 2018 Caps Maturities Notional Amount Weighted Average Cap Rate Weighted Average Receive Rate Weighted Average Maturity (Years) 2019 $ 800,000 1.344 % 2.422 % 0.53 2020 $ 1,700,000 1.250 % 2.766 % 1.29 Total $ 2,500,000 1.280 % 2.656 % 1.04 The Company did not hold any interest rate caps as of December 31, 2017
Schedule of Total Return Swaps	The Company had the following total return swap agreements in place at December 31, 2018 and December 31, 2017 : (notional and dollars in thousands) December 31, 2018 Maturity Date Current Notional Amount Fair Value Cost Basis Unrealized Gain (Loss) January 12, 2043 $ (21,395 ) $ (153 ) $ (30 ) $ (123 ) January 12, 2044 (26,870 ) (230 ) (29 ) (201 ) Total $ (48,265 ) $ (383 ) $ (59 ) $ (324 ) (notional and dollars in thousands) December 31, 2017 Maturity Date Current Notional Amount Fair Value Cost Basis Unrealized Gain (Loss) January 12, 2043 $ (24,362 ) $ (24 ) $ 201 $ (225 ) January 12, 2044 (39,145 ) (82 ) 366 (448 ) Total $ (63,507 ) $ (106 ) $ 567 $ (673 )

Offsetting Assets and Liabili_2

Offsetting Assets and Liabilities Offsetting Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2018
Offsetting [Abstract]
Offsetting Assets	The following tables present information about the Company’s assets and liabilities that are subject to master netting arrangements or similar agreements and can potentially be offset on the Company’s consolidated balance sheets as of December 31, 2018 and December 31, 2017 : December 31, 2018 Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Balance Sheets (1) (in thousands) Gross Amounts of Recognized Assets (Liabilities) Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Assets (Liabilities) Presented in the Consolidated Balance Sheets Financial Instruments Cash Collateral (Received) Pledged Net Amount Assets Derivative assets $ 599,573 $ (279,592 ) $ 319,981 $ (58,775 ) $ — $ 261,206 Reverse repurchase agreements 761,815 $ — $ 761,815 (761,815 ) $ — $ — Total Assets $ 1,361,388 $ (279,592 ) $ 1,081,796 $ (820,590 ) $ — $ 261,206 Liabilities Repurchase agreements $ (23,133,476 ) $ — $ (23,133,476 ) $ 23,133,476 $ — $ — Derivative liabilities (1,100,182 ) 279,592 (820,590 ) 820,590 — — Total Liabilities $ (24,233,658 ) $ 279,592 $ (23,954,066 ) $ 23,954,066 $ — $ — December 31, 2017 Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Balance Sheets (1) (in thousands) Gross Amounts of Recognized Assets (Liabilities) Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Assets (Liabilities) Presented in the Consolidated Balance Sheets Financial Instruments Cash Collateral (Received) Pledged Net Amount Assets Derivative assets $ 340,576 $ (30,658 ) $ 309,918 $ (31,903 ) $ — $ 278,015 Total Assets $ 340,576 $ (30,658 ) $ 309,918 $ (31,903 ) $ — $ 278,015 Liabilities Repurchase agreements $ (19,451,207 ) $ — $ (19,451,207 ) $ 19,451,207 $ — $ — Derivative liabilities (62,561 ) 30,658 (31,903 ) 31,903 — — Total Liabilities $ (19,513,768 ) $ 30,658 $ (19,483,110 ) $ 19,483,110 $ — $ — ____________________ (1) Amounts presented are limited in total to the net amount of assets or liabilities presented in the consolidated balance sheets by instrument. Excess cash collateral or financial assets that are pledged to counterparties may exceed the financial liabilities subject to a master netting arrangement or similar agreement, or counterparties may have pledged excess cash collateral to the Company that exceed the corresponding financial assets. These excess amounts are excluded from the table above, although separately reported within restricted cash, due from counterparties, or due to counterparties in the Company’s consolidated
Offsetting Liabilities	The following tables present information about the Company’s assets and liabilities that are subject to master netting arrangements or similar agreements and can potentially be offset on the Company’s consolidated balance sheets as of December 31, 2018 and December 31, 2017 : December 31, 2018 Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Balance Sheets (1) (in thousands) Gross Amounts of Recognized Assets (Liabilities) Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Assets (Liabilities) Presented in the Consolidated Balance Sheets Financial Instruments Cash Collateral (Received) Pledged Net Amount Assets Derivative assets $ 599,573 $ (279,592 ) $ 319,981 $ (58,775 ) $ — $ 261,206 Reverse repurchase agreements 761,815 $ — $ 761,815 (761,815 ) $ — $ — Total Assets $ 1,361,388 $ (279,592 ) $ 1,081,796 $ (820,590 ) $ — $ 261,206 Liabilities Repurchase agreements $ (23,133,476 ) $ — $ (23,133,476 ) $ 23,133,476 $ — $ — Derivative liabilities (1,100,182 ) 279,592 (820,590 ) 820,590 — — Total Liabilities $ (24,233,658 ) $ 279,592 $ (23,954,066 ) $ 23,954,066 $ — $ — December 31, 2017 Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Balance Sheets (1) (in thousands) Gross Amounts of Recognized Assets (Liabilities) Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Assets (Liabilities) Presented in the Consolidated Balance Sheets Financial Instruments Cash Collateral (Received) Pledged Net Amount Assets Derivative assets $ 340,576 $ (30,658 ) $ 309,918 $ (31,903 ) $ — $ 278,015 Total Assets $ 340,576 $ (30,658 ) $ 309,918 $ (31,903 ) $ — $ 278,015 Liabilities Repurchase agreements $ (19,451,207 ) $ — $ (19,451,207 ) $ 19,451,207 $ — $ — Derivative liabilities (62,561 ) 30,658 (31,903 ) 31,903 — — Total Liabilities $ (19,513,768 ) $ 30,658 $ (19,483,110 ) $ 19,483,110 $ — $ — ____________________ (1) Amounts presented are limited in total to the net amount of assets or liabilities presented in the consolidated balance sheets by instrument. Excess cash collateral or financial assets that are pledged to counterparties may exceed the financial liabilities subject to a master netting arrangement or similar agreement, or counterparties may have pledged excess cash collateral to the Company that exceed the corresponding financial assets. These excess amounts are excluded from the table above, although separately reported within restricted cash, due from counterparties, or due to counterparties in the Company’s consolidated

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following tables display the Company’s assets and liabilities measured at fair value on a recurring basis. The Company often economically hedges the fair value change of its assets or liabilities with derivatives and other financial instruments. The tables below display the hedges separately from the hedged items, and therefore do not directly display the impact of the Company’s risk management activities. Recurring Fair Value Measurements December 31, 2018 (in thousands) Level 1 Level 2 Level 3 Total Assets Available-for-sale securities $ — $ 25,447,447 $ 105,157 $ 25,552,604 Mortgage servicing rights — — 1,993,440 1,993,440 Derivative assets 21,602 298,379 — 319,981 Total assets $ 21,602 $ 25,745,826 $ 2,098,597 $ 27,866,025 Liabilities Derivative liabilities $ — $ 820,590 $ — $ 820,590 Total liabilities $ — $ 820,590 $ — $ 820,590 Recurring Fair Value Measurements December 31, 2017 (in thousands) Level 1 Level 2 Level 3 Total Assets Available-for-sale securities $ — $ 21,067,678 $ 153,141 $ 21,220,819 Mortgage servicing rights — — 1,086,717 1,086,717 Derivative assets 913 309,005 — 309,918 Other assets 29,413 — — 29,413 Total assets $ 30,326 $ 21,376,683 $ 1,239,858 $ 22,646,867 Liabilities Derivative liabilities 1,930 29,973 — 31,903 Total liabilities $ 1,930 $ 29,973 $ — $ 31,903
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	The following tables present the reconciliation for all of the Company’s Level 3 assets measured at fair value on a recurring basis: Year Ended December 31, 2018 (in thousands) Available-For-Sale Securities Mortgage Servicing Rights Beginning of period level 3 fair value $ 153,141 $ 1,086,717 Gains (losses) included in net (loss) income: Realized gains and losses, net (2,538 ) (149,242 ) Unrealized gains and losses, net — 80,209 Net gains (losses) included in net (loss) income (2,538 ) (69,033 ) Other comprehensive (loss) income (1,960 ) — Purchases 17,861 988,283 Sales — (637 ) Settlements (153,000 ) (11,890 ) Gross transfers into level 3 91,653 — Gross transfers out of level 3 — — End of period level 3 fair value $ 105,157 $ 1,993,440 Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period — $ 68,518 Change in unrealized gains or losses for the period included in other comprehensive (loss) income for assets held at the end of the reporting period (1,818 ) $ — Year Ended December 31, 2017 (in thousands) Available-For-Sale Securities Mortgage Servicing Rights Beginning of period level 3 fair value $ — $ 693,815 Gains (losses) included in net (loss) income: Realized gains and (losses), net — (97,372 ) Unrealized gains and (losses), net — 6,339 Net gains (losses) included in net (loss) income — (91,033 ) Other comprehensive (loss) income 141 — Purchases 153,000 499,886 Sales — (355 ) Settlements — (15,596 ) Gross transfers into level 3 — — Gross transfers out of level 3 — — End of period level 3 fair value $ 153,141 $ 1,086,717 Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period $ — $ 5,870 Change in unrealized gains or losses for the period included in other comprehensive (loss) income for assets held at the end of the reporting period 141 $ — ____________________ (1) The change in unrealized gains or losses on MSR was recorded in loss on servicing asset on the consolidated statements of comprehensive (loss) income . (2) The change in unrealized gains or losses on MSR that were held at the end of the reporting period was recorded in loss on servicing asset on the consolidated statements of comprehensive (loss) income
Fair Value Inputs, Assets, Quantitative Information	The table below presents information about the significant unobservable inputs used by the third-party pricing providers in the fair value measurement of the Company’s MSR classified as Level 3 fair value assets at December 31, 2018 : December 31, 2018 Valuation Technique Unobservable Input (1) Range Weighted Average (2) Discounted cash flow Constant prepayment speed 7.6 - 9.6 % 8.6% Delinquency 1.0 - 1.5 % 1.3% Discount rate 8.2 - 10.7 % 9.4% December 31, 2017 Valuation Technique Unobservable Input (1) Range Weighted Average (2) Discounted cash flow Constant prepayment speed 8.2 - 11.2 % 9.8% Delinquency 1.3 - 2.0 % 1.7% Discount rate 8.3 - 11.2 % 9.9% ___________________ (1) Significant increases (decreases) in any of the inputs in isolation may result in significantly lower (higher) fair value measurement. A change in the assumption used for discount rates may be accompanied by a directionally similar change in the assumption used for the probability of delinquency and a directionally opposite change in the assumption used for prepayment rates. (2)
Fair Value, Option, Quantitative Disclosures	The following tables summarize the fair value option elections and information regarding the line items and amounts recognized in the consolidated statements of comprehensive (loss) income for each fair value option-elected item. Year Ended December 31, 2017 (in thousands) Interest income (expense) Other income Total included in net (loss) income Change in fair value due to credit risk Assets Residential mortgage loans held-for-investment in securitization trusts 102,886 (1) 45,275 148,161 $ — (2) Liabilities Collateralized borrowings in securitization trusts (82,573 ) (22,592 ) (105,165 ) — (2) Total $ 20,313 $ 22,683 $ 42,996 $ — Year Ended December 31, 2016 (in thousands) Interest income (expense) Other income Total included in net (loss) income Change in fair value due to credit risk Assets Residential mortgage loans held-for-investment in securitization trusts 133,993 (1) (19,741 ) 114,252 — (2) Liabilities Collateralized borrowings in securitization trusts (97,729 ) 7,907 (89,822 ) — (2) Total $ 36,264 $ (11,834 ) $ 24,430 $ — ____________________ (1) Interest income on residential mortgage loans held-for-investment in securitization trusts is measured by multiplying the unpaid principal balance on the loans by the coupon rate and the number of days of interest due. (2)
Fair Value, by Balance Sheet Grouping	The following table presents the carrying values and estimated fair values of assets and liabilities that are required to be recorded or disclosed at fair value at December 31, 2018 and December 31, 2017 . December 31, 2018 December 31, 2017 (in thousands) Carrying Value Fair Value Carrying Value Fair Value Assets Available-for-sale securities $ 25,552,604 $ 25,552,604 $ 21,220,819 $ 21,220,819 Mortgage servicing rights $ 1,993,440 $ 1,993,440 $ 1,086,717 $ 1,086,717 Cash and cash equivalents $ 409,758 $ 409,758 $ 419,159 $ 419,159 Restricted cash $ 688,006 $ 688,006 $ 635,836 $ 635,836 Derivative assets $ 319,981 $ 319,981 $ 309,918 $ 309,918 Reverse repurchase agreements $ 761,815 $ 761,815 $ — $ — Other assets $ 74,412 $ 74,412 116,653 116,653 Liabilities Repurchase agreements $ 23,133,476 $ 23,133,476 $ 19,451,207 $ 19,451,207 Federal Home Loan Bank advances $ 865,024 $ 865,024 $ 1,215,024 $ 1,215,024 Revolving credit facilities $ 310,000 $ 310,000 $ 20,000 $ 20,000 Convertible senior notes $ 283,856 $ 281,951 $ 282,827 $ 306,351 Derivative liabilities $ 820,590 $ 820,590 $ 31,903 $ 31,903

Repurchase Agreements (Tables)

Repurchase Agreements (Tables)	12 Months Ended
	Dec. 31, 2018
Disclosure of Repurchase Agreements [Abstract]
Schedule of Repurchase Agreements By Term, Short or Long	At December 31, 2018 and December 31, 2017 , the repurchase agreement balances were as follows: (in thousands) December 31, December 31, Short-term $ 22,833,476 $ 19,338,707 Long-term 300,000 112,500 Total $ 23,133,476 $ 19,451,207
Schedule of Repurchase Agreements by Maturity	At December 31, 2018 and December 31, 2017 , the repurchase agreements had the following characteristics and remaining maturities: December 31, 2018 Collateral Type (in thousands) Agency RMBS Non-Agency Securities Agency Derivatives Mortgage Servicing Rights Total Amount Outstanding Within 30 days $ 6,712,021 $ 770,287 $ 6,561 $ — $ 7,488,869 30 to 59 days 4,557,688 496,466 23,444 — 5,077,598 60 to 89 days 5,410,967 242,473 1,621 — 5,655,061 90 to 119 days 1,209,395 722,399 7,065 — 1,938,859 120 to 364 days 2,201,325 463,939 7,825 — 2,673,089 One year and over — — — 300,000 300,000 Total $ 20,091,396 $ 2,695,564 $ 46,516 $ 300,000 $ 23,133,476 Weighted average borrowing rate 2.52 % 3.65 % 3.34 % 4.51 % 2.68 % December 31, 2017 Collateral Type (in thousands) Agency RMBS Non-Agency Securities Agency Derivatives Mortgage Servicing Rights Total Amount Outstanding Within 30 days $ 3,634,541 $ 613,500 $ 21,423 $ — $ 4,269,464 30 to 59 days 3,522,256 261,835 47,020 — 3,831,111 60 to 89 days 3,165,834 290,628 2,478 — 3,458,940 90 to 119 days 2,119,490 332,614 322 — 2,452,426 120 to 364 days 4,883,432 443,334 — — 5,326,766 One year and over — — — 112,500 112,500 Total $ 17,325,553 $ 1,941,911 $ 71,243 $ 112,500 $ 19,451,207 Weighted average borrowing rate 1.53 % 2.98 % 2.15 % 3.78 % 1.69 %
Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets	The following table summarizes assets at carrying values that are pledged or restricted as collateral for the future payment obligations of repurchase agreements and derivative instruments: (in thousands) December 31, December 31, Available-for-sale securities, at fair value $ 24,240,507 $ 19,780,175 Mortgage servicing rights, at fair value 685,683 424,740 Cash and cash equivalents — 15,000 Restricted cash 416,696 417,018 Due from counterparties 110,695 773,422 Derivative assets, at fair value 70,191 90,895 U.S. Treasuries (1) 6,457 — Total $ 25,530,229 $ 21,501,250 ____________________ (1)
Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 10 Percent of Stockholders' Equity	. The following table summarizes certain characteristics of the Company’s repurchase agreements and counterparty concentration at December 31, 2018 and December 31, 2017 : December 31, 2018 December 31, 2017 (dollars in thousands) Amount Outstanding Net Counterparty Exposure (1) Percent of Equity Weighted Average Days to Maturity Amount Outstanding Net Counterparty Exposure (1) Percent of Equity Weighted Average Days to Maturity Royal Bank of Canada $ 2,504,438 $ 342,739 8 % 94 $ 1,261,956 $ 223,347 6 % 75 All other counterparties (2) 20,629,038 1,679,335 39 % 63 18,189,251 1,519,776 43 % 84 Total $ 23,133,476 $ 2,022,074 $ 19,451,207 $ 1,743,123 ____________________ (1) Represents the net carrying value of the assets sold under agreements to repurchase, including accrued interest plus any cash or assets on deposit to secure the repurchase obligation, less the amount of the repurchase liability, including accrued interest. The Company did not have any such payables at December 31, 2018 nor December 31, 2017 . (2) Represents amounts outstanding with 29 and 26 counterparties at December 31, 2018 and December 31, 2017

Federal Home Loan Bank of Des_2

Federal Home Loan Bank of Des Moines Advances (Tables)	12 Months Ended
	Dec. 31, 2018
Advances from Federal Home Loan Banks [Abstract]
Schedule of Maturities of Federal Home Loan Bank Advances	At December 31, 2018 and December 31, 2017 , FHLB advances had the following remaining maturities: (in thousands) December 31, December 31, ≤ 1 year $ 815,024 $ — > 1 and ≤ 3 years — 815,024 > 3 and ≤ 5 years — — > 5 and ≤ 10 years — — > 10 years 50,000 400,000 Total $ 865,024 $ 1,215,024
Schedule of Underlying Assets of Federal Home Loan Bank Advances	The following table summarizes assets at carrying values that are pledged or restricted as collateral for the future payment obligations of FHLB advances: (in thousands) December 31, December 31, Available-for-sale securities, at fair value $ 917,492 $ 1,210,715 Due from counterparties — 62,959 Total $ 917,492 $ 1,273,674

Revolving Credit Facilities (Ta

Revolving Credit Facilities (Tables)	12 Months Ended
	Dec. 31, 2018
Revolving Credit Facilities [Abstract]
Schedule of Line of Credit Facilities	At December 31, 2018 and December 31, 2017 , borrowings under revolving credit facilities had the following remaining maturities: (in thousands) December 31, December 31, Within 30 days $ — $ — 30 to 59 days — — 60 to 89 days — — 90 to 119 days — — 120 to 364 days 20,000 20,000 One year and over 290,000 — Total $ 310,000 $ 20,000

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Preferred Stock	The following is a summary of the Company's series of cumulative redeemable preferred stock issued and outstanding as of December 31, 2018 . In the event of a voluntary or involuntary liquidation, dissolution or winding up of the Company, each series of preferred stock will rank on parity with one another and rank senior to the Company's common stock with respect to the payment of the dividends and the distribution of assets. As of December 31, 2018 (in thousands) Class of Stock Issuance Date Shares issued and outstanding Carrying Value Contractual rate Redemption date (1) Fixed to floating rate conversion date (2) Floating annual rate (3) Fixed-to-Floating rate Series A March 14, 2017 5,750 138,872 8.125 % April 27, 2027 April 27, 2027 3M LIBOR + 5.660% Series B July 19, 2017 11,500 278,094 7.625 % July 27, 2027 July 27, 2027 3M LIBOR + 5.352% Series C November 27, 2017 11,800 285,584 7.250 % January 27, 2025 January 27, 2025 3M LIBOR + 5.011% Fixed Rate Series D July 31, 2018 3,000 74,964 7.750 % July 31, 2018 N/A N/A Series E July 31, 2018 8,000 199,987 7.500 % July 31, 2018 N/A N/A Total 40,050 $977,501 ____________________ (1) Subject to the Company's right under limited circumstances to redeem the preferred stock earlier than the redemption date disclosed in order to preserve its qualification as a REIT or following a change in control of the Company. (2) For the fixed-to-floating rate redeemable preferred stock, the dividend rate will remain at a annual fixed rate of the $25.00 per share liquidation preference from the issuance date up to but not including the transition date disclosed within. Effective the conversion date and onward, dividends will accumulate on a floating rate basis according to the terms disclosed within (3) below. (3) On and after the fixed to floating rate conversion date, the dividend will accumulate and be payable quarterly at a percentage of the $25.00
Preferred Dividends Declared	The following table presents cash dividends declared by the Company on its preferred stock since their issuances: Declaration Date Record Date Payment Date Cash Dividend Per Preferred Share Series A Preferred Stock: December 18, 2018 December 31, 2018 January 28, 2019 $ 0.507810 September 20, 2018 October 12, 2018 October 29, 2018 $ 0.507810 June 19, 2018 July 12, 2018 July 27, 2018 $ 0.507810 March 20, 2018 April 12, 2018 April 27, 2018 $ 0.507810 December 14, 2017 January 12, 2018 January 29, 2018 $ 0.507810 September 14, 2017 October 12, 2017 October 27, 2017 $ 0.507810 June 15, 2017 July 12, 2017 July 27, 2017 $ 0.750430 Series B Preferred Stock: December 18, 2018 December 31, 2018 January 28, 2019 $ 0.476560 September 20, 2018 October 12, 2018 October 29, 2018 $ 0.476560 June 19, 2018 July 12, 2018 July 27, 2018 $ 0.476560 March 20, 2018 April 12, 2018 April 27, 2018 $ 0.476560 December 14, 2017 January 12, 2018 January 29, 2018 $ 0.476560 September 14, 2017 October 12, 2017 October 27, 2017 $ 0.518920 Series C Preferred Stock: December 18, 2018 December 31, 2018 January 28, 2019 $ 0.453130 September 20, 2018 October 12, 2018 October 29, 2018 $ 0.453130 June 19, 2018 July 12, 2018 July 27, 2018 $ 0.453130 March 20, 2018 April 12, 2018 April 27, 2018 $ 0.453130 December 14, 2017 January 12, 2018 January 29, 2018 $ 0.302080 Series D Preferred Stock: December 18, 2018 December 31, 2018 January 28, 2019 $ 0.484375 September 20, 2018 October 1, 2018 October 15, 2018 $ 0.484375 Series E Preferred Stock: December 18, 2018 December 31, 2018 January 28, 2019 $ 0.468750 September 20, 2018 October 1, 2018 October 15, 2018 $ 0.468750
Schedule of Stock by Class	The following table presents a reconciliation of the common shares outstanding for the years ended December 31, 2018 , 2017 and 2016 : Number of common shares Common shares outstanding, December 31, 2015 176,953,403 Issuance of common stock 30,301 Issuance of restricted stock (1) 852,459 Repurchase of common stock (4,010,000 ) Common shares outstanding, December 31, 2016 173,826,163 Issuance of common stock 26,950 Issuance of restricted stock (1) 643,474 Common shares outstanding, December 31, 2017 174,496,587 Issuance of common stock 72,616,483 Issuance of restricted stock (1) 972,651 Common shares outstanding, December 31, 2018 248,085,721 ____________________ (1) Represents shares of restricted stock granted under the Second Restated 2009 Equity Incentive Plan, net of forfeitures, of which 1,593,701 restricted shares remained subject to vesting requirements at December 31, 2018
Common Dividends Declared	The following table presents cash dividends declared by the Company on its common stock during the he years ended December 31, 2018 , 2017 and 2016 : Declaration Date Record Date Payment Date Cash Dividend Per Common Share December 18, 2018 December 31, 2018 January 28, 2019 $ 0.470000 September 20, 2018 October 1, 2018 October 29, 2018 $ 0.311630 July 13, 2018 July 25, 2018 July 30, 2018 $ 0.158370 June 19, 2018 June 29, 2018 July 27, 2018 $ 0.470000 March 20, 2018 April 2, 2018 April 27, 2018 $ 0.470000 December 14, 2017 December 26, 2017 December 29, 2017 $ 0.470000 September 14, 2017 September 29, 2017 October 27, 2017 $ 0.520000 June 15, 2017 June 30, 2017 July 27, 2017 $ 0.520000 March 14, 2017 March 31, 2017 April 27, 2017 $ 0.500000 December 15, 2016 December 30, 2016 January 27, 2017 $ 0.480000 September 15, 2016 September 30, 2016 October 20, 2016 $ 0.460000 June 16, 2016 June 30, 2016 July 20, 2016 $ 0.460000 March 15, 2016 March 31, 2016 April 21, 2016 $ 0.460000
Schedule of Accumulated Other Comprehensive Income (Loss)	Accumulated other comprehensive (loss) income at December 31, 2018 and December 31, 2017 was as follows: (in thousands) December 31, December 31, Available-for-sale securities Unrealized gains $ 498,744 $ 475,694 Unrealized losses (387,927 ) (140,881 ) Accumulated other comprehensive (loss) income $ 110,817 $ 334,813
Reclassification out of Accumulated Other Comprehensive Income	The following table summarizes reclassifications out of accumulated other comprehensive income for the years ended December 31, 2018 , 2017 and 2016 : Affected Line Item in the Consolidated Statements of Comprehensive (Loss) Income Amount Reclassified out of Accumulated Other Comprehensive (Loss) Income Year Ended (in thousands) December 31, 2018 2017 2016 Other-than-temporary impairments on AFS securities Total other-than-temporary impairment losses $ 470 $ 789 $ 1,822 Realized losses (gains) on sales of certain AFS securities, net of tax Loss on investment securities 253,869 5,207 (102,852 ) Total $ 254,339 $ 5,996 $ (101,030 )

Equity Incentive Plan (Tables)

Equity Incentive Plan (Tables)	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity	The following table summarizes the activity related to restricted common stock for the year ended December 31, 2018 and 2017 : Year Ended December 31, 2018 2017 Shares Weighted Average Grant Date Fair Market Value Shares Weighted Average Grant Date Fair Market Value Outstanding at Beginning of Period 1,284,010 $ 17.15 1,319,712 $ 17.10 Granted 996,924 14.96 671,845 17.60 Vested (673,118 ) (17.12 ) (684,727 ) (17.47 ) Forfeited (14,115 ) (15.59 ) (22,820 ) (17.90 ) Outstanding at End of Period 1,593,701 $ 15.81 1,284,010 $ 17.15

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	The following table summarizes the tax (benefit) provision from continuing operations recorded at the taxable subsidiary level for the years ended December 31, 2018 , 2017 and 2016 : Year Ended December 31, (in thousands) 2018 2017 2016 Current tax (benefit) provision: Federal $ 52 $ 492 $ (1,616 ) State 1 57 164 Total current tax (benefit) provision 53 549 (1,452 ) Deferred tax (benefit) provision 41,770 (11,031 ) 13,766 Total (benefit from) provision for income taxes $ 41,823 $ (10,482 ) $ 12,314
Schedule of Effective Income Tax Rate Reconciliation	The following is a reconciliation of the statutory federal and state rates to the effective rates, for the years ended December 31, 2018 , 2017 and 2016 : Year Ended December 31, 2018 2017 2016 (dollars in thousands) Amount Percent Amount Percent Amount Percent Computed income tax expense at federal rate $ (518 ) 21 % $ 104,215 35 % $ 127,957 35 % State taxes, net of federal benefit, if applicable 1 — % 37 — % 106 — % Permanent differences in taxable income from GAAP net income (1) 28,414 (1,152 )% 1,208 — % 401 — % Dividends paid deduction 13,926 (565 )% (115,942 ) (39 )% (116,150 ) (32 )% (Benefit from) provision for income taxes/ Effective Tax Rate (2) $ 41,823 (1,696 )% $ (10,482 ) (4 )% $ 12,314 3 % ____________________ (1) For the year ended December 31, 2018 , permanent differences include a provision of 17.8 million related to the write-down of the net deferred tax assets resulting from the deemed liquidation of three of the Company’s TRSs due to their election revocation, offset by the reversal of the valuation allowance upon TRS revocation. For the year ended December 31, 2017 , permanent differences include a provision of $17.5 million related to the effect of the federal tax reform statutory rate change from 35% to 21% . (2)
Schedule Of Current And Deferred Tax Assets And Liabilities	The Company’s consolidated balance sheets, as of December 31, 2018 and December 31, 2017 contain the following current and deferred tax liabilities and assets, which are included in other assets, and are recorded at the taxable subsidiary level: (in thousands) December 31, December 31, Income taxes receivable Federal income taxes receivable $ 690 $ 130 State and local income taxes receivable — — Income taxes receivable, net 690 130 Deferred tax assets (liabilities) Deferred tax asset 17,196 50,419 Deferred tax liability (18,333 ) (24,463 ) Total net deferred tax (liabilities) assets (1,137 ) 25,956 Total tax assets (liabilities), net $ (447 ) $ 26,086
Schedule of Deferred Tax Assets and Liabilities	Components of the Company’s deferred tax liabilities and assets as of December 31, 2018 and December 31, 2017 were as follows: (in thousands) December 31, December 31, Available-for-sale securities $ 19 $ (11,917 ) Mortgage servicing rights (18,333 ) (9,054 ) Derivative assets and liabilities 33 4,870 Other assets 9 139 Other liabilities 652 545 Intangibles 101 108 Alternative minimum tax credit — 2,386 Net operating loss carryforward 16,354 21,853 Capital loss carryforward 28 19,766 Total deferred tax (liabilities) assets (1,137 ) 28,696 Valuation allowance — (2,740 ) Total net deferred tax (liabilities) assets $ (1,137 ) $ 25,956

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table presents a reconciliation of the (loss) earnings and shares used in calculating basic and diluted (loss) earnings per share for the years ended December 31, 2018 and 2017 . All per share amounts, common shares outstanding and restricted shares for all periods presented reflect the Company’s one-for-two reverse stock split effected on November 1, 2017 (refer to Note 16 - Stockholders’ Equity for additional information). Year Ended December 31, (in thousands, except share data) 2018 2017 2016 Numerator: Net (loss) income from continuing operations $ (44,290 ) $ 308,239 $ 317,921 Income from discontinued operations, net of tax — 44,146 35,357 Net (loss) income (44,290 ) 352,385 353,278 Income from discontinued operations attributable to noncontrolling interest — 3,814 — Net (loss) income attributable to Two Harbors Investment Corp. (44,290 ) 348,571 353,278 Dividends on preferred stock 65,395 25,122 — Net (loss) income attributable to common stockholders - basic (109,685 ) 323,449 353,278 Interest expense attributable to convertible notes (1) — 17,867 — Net (loss) income attributable to common stockholders - diluted $ (109,685 ) $ 341,316 353,278 Denominator: Weighted average common shares outstanding 204,409,853 173,063,178 172,523,497 Weighted average restricted stock shares 1,610,649 1,370,821 1,513,355 Basic weighted average shares outstanding 206,020,502 174,433,999 174,036,852 Effect of dilutive shares issued in an assumed conversion — 13,699,342 — Diluted weighted average shares outstanding 206,020,502 188,133,341 174,036,852 Basic (Loss) Earnings Per Share: Net (loss) income $ (0.53 ) $ 1.85 $ 2.03 Diluted (Loss) Earnings Per Share: Net (loss) income $ (0.53 ) $ 1.81 $ 2.03 ___________________ (1)

Quarterly Financial Data (Table

Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information	2018 Quarter Ended (in thousands, except share data) March 31 June 30 September 30 December 31 Total interest income $ 194,019 $ 187,360 $ 236,698 $ 251,955 Total interest expense 96,560 108,414 152,396 162,301 Net interest income 97,459 78,946 84,302 89,654 Other-than-temporary impairment losses (94 ) (174 ) (95 ) (107 ) Total other income (loss) 281,982 93,174 112,514 (590,696 ) Total expenses 40,754 38,507 123,366 46,705 Provision for (benefit from) income taxes 3,784 (6,051 ) 37,409 6,681 Dividends on preferred stock 13,747 13,747 18,951 18,950 Net income (loss) attributable to common stockholders $ 321,062 $ 125,743 $ 16,995 $ (573,485 ) Basic earnings per share: Continuing operations $ 1.83 $ 0.72 $ 0.08 $ (2.31 ) Net income (loss) $ 1.83 $ 0.72 $ 0.08 $ (2.31 ) Diluted earnings per share: Continuing operations $ 1.69 $ 0.68 $ 0.08 $ (2.31 ) Net income (loss) $ 1.69 $ 0.68 $ 0.08 $ (2.31 ) 2017 Quarter Ended (in thousands, except share data) March 31 June 30 September 30 December 31 Total interest income $ 169,154 $ 184,741 $ 196,089 $ 195,105 Total interest expense 70,685 85,281 99,427 94,795 Net interest income 98,469 99,460 96,662 100,310 Other-than-temporary impairment losses — (429 ) — (360 ) Total other (loss) income (35,585 ) (57,197 ) 23,060 103,288 Total expenses 28,870 38,614 31,844 30,593 (Benefit from) provision for income taxes (24,517 ) 8,759 (5,342 ) 10,618 Income from discontinued operations (net of noncontrolling), net of tax 13,454 14,157 8,844 3,877 Dividends on preferred stock — 4,285 8,888 11,949 Net income attributable to common stockholders $ 71,985 $ 4,333 $ 93,176 $ 153,955 Basic earnings per share: Continuing operations $ 0.33 $ (0.06 ) $ 0.48 $ 0.86 Discontinued operations 0.08 0.08 0.05 0.02 Net income $ 0.41 $ 0.02 $ 0.53 $ 0.88 Diluted earnings per share: Continuing operations $ 0.33 $ (0.06 ) $ 0.47 $ 0.82 Discontinued operations 0.08 0.08 0.05 0.02 Net income $ 0.41 $ 0.02 $ 0.52 $ 0.84

Organization and Operations (De

Organization and Operations (Details)	Jun. 28, 2017shares
Organization and Operations [Abstract]
Shares of Granite Point Mortgage Trust Inc. common stock received in exchange for contribution (in shares)	33,100,000
Ownership percentage in Granite Point Mortgage Trust Inc.	76.50%

Organization and Operations Spe

Organization and Operations Special Dividend (Details)	Nov. 01, 2017shares
Organization and Operations [Abstract]
Number of shares of common stock of Granite Point Mortgage Trust Inc distributed via special dividend (in shares)	33,100,000

Organization and Operations Acq

Organization and Operations Acquisition of CYS Investments, Inc. (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jul. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Number of shares of stock issued during period (in shares)				30,301
Aggregate cash consideration exchanged for shares of CYS common stock	$ 14,967
Common Stock [Member]
Class of Stock [Line Items]
Number of shares of stock issued during period (in shares)	72,587,772	72,616,483	26,950
Series D Preferred Stock [Member]
Class of Stock [Line Items]
Number of shares of stock issued during period (in shares)	3,000,000
Series E Preferred Stock [Member]
Class of Stock [Line Items]
Number of shares of stock issued during period (in shares)	8,000,000

Basis of Presentation and Sig_3

Basis of Presentation and Significant Accounting Policies Consolidation and Basis of Presentation (Details)	Nov. 01, 2017shares
Basis of Presentation and Significant Accounting Policies [Abstract]
Reverse stock split, conversion ratio	0.50
Number of shares of common stock of Granite Point Mortgage Trust Inc distributed via special dividend (in shares)	33,100,000

Basis of Presentation and Sig_4

Basis of Presentation and Significant Accounting Policies Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Basis of Presentation and Significant Accounting Policies [Abstract]
Percent of REIT taxable income the company is required to distribute	90.00%
Federal income tax rate applicable to corporations	21.00%	35.00%	35.00%
Tax provision related to the decrease in the federal income tax rate applicable to corporations	$ 17.8	$ 17.5

Basis of Presentation and Sig_5

Basis of Presentation and Significant Accounting Policies Asset Acquisition (Details)	Jul. 31, 2018
Basis of Presentation and Significant Accounting Policies [Abstract]
Agency RMBS, as a percentage of gross assets, acquired in connection with the acquisition of CYS Investments, Inc.	89.00%

Basis of Presentation and Sig_6

Basis of Presentation and Significant Accounting Policies Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (Details) $ in Thousands	Dec. 31, 2017USD ($)
Cumulative effect of adoption of new accounting principles	$ 0
Cumulative Earnings
Cumulative effect of adoption of new accounting principles	$ (9,943)

Acquisition of CYS Investment_3

Acquisition of CYS Investments, Inc. (Details) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Jul. 31, 2018USD ($)$ / sharesshares	Dec. 31, 2018shares	Dec. 31, 2017shares	Dec. 31, 2016shares
Class of Stock [Line Items]
Number of shares of stock issued during period (in shares)				30,301
Aggregate cash consideration exchanged for shares of CYS common stock | $	$ 14,967
Cash consideration provided to CYS common stockholders (in usd per share) | $ / shares	$ 0.0965
Exchange ratio for number of shares of Two Harbors common stock issued	0.4680
Common Stock [Member]
Class of Stock [Line Items]
Number of shares of stock issued during period (in shares)	72,587,772	72,616,483	26,950
Series D Preferred Stock [Member]
Class of Stock [Line Items]
Number of shares of stock issued during period (in shares)	3,000,000
Series E Preferred Stock [Member]
Class of Stock [Line Items]
Number of shares of stock issued during period (in shares)	8,000,000

Acquisition of CYS Investment_4

Acquisition of CYS Investments, Inc. Calculation of the Purchase Price of CYS Investments, Inc. (Details)	1 Months Ended	12 Months Ended
	Jul. 31, 2018USD ($)$ / sharesshares	Dec. 31, 2018USD ($)shares	Dec. 31, 2017USD ($)shares	Dec. 31, 2016shares	Dec. 31, 2015shares
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Total Purchase Price | $	$ 1,415,084,000
Common stock share price (in usd per share) | $ / shares	$ 15.50
CYS common shares outstanding (in shares)		248,085,721	174,496,587	173,826,163	176,953,403
Exchange ratio for number of shares of Two Harbors common stock issued	0.4680
Number of shares of common stock issuable in connection with the acquisition of CYS Investments, Inc. (in shares)	72,587,990
Number of fractional shares of common stock not issued in connection with the acquisition of CYS Investments, Inc. (in shares)	218
Number of shares of stock issued during period (in shares)				30,301
Value of common stock issued in connection with the acquisition of CYS Investments, Inc. | $		$ 1,400,064,000
Price per share paid to CYS common stockholders for fractional shares not issued in connection with the acquisition (in usd per share) | $ / shares	$ 15.59
Total cash paid to CYS common stockholders for fractional shares not issued in connection with the acquisition | $	$ 3,000
Cash consideration provided to CYS common stockholders (in usd per share) | $ / shares	$ 0.0965
Aggregate cash consideration exchanged for shares of CYS common stock | $	$ 14,967,000
Preferred stock liquidation preference | $		$ 1,001,250,000	$ 726,250,000
CYS Investments, Inc. [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
CYS common shares outstanding (in shares)	155,102,543
Common Stock [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
CYS common shares outstanding (in shares)		248,085,721	174,496,587
Number of shares of stock issued during period (in shares)	72,587,772	72,616,483	26,950
Series D Preferred Stock [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Number of shares of stock issued during period (in shares)	3,000,000
Preferred stock liquidation preference | $	$ 75,000,000
Series E Preferred Stock [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Number of shares of stock issued during period (in shares)	8,000,000
Preferred stock liquidation preference | $	$ 200,000,000
Common Stock Including Additional Paid in Capital
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Value of common stock issued in connection with the acquisition of CYS Investments, Inc. | $	$ 1,125,114,000

Acquisition of CYS Investment_5

Acquisition of CYS Investments, Inc. Allocation of Purchase Price to Assets Acquired and LIabilities Assumed (Details) $ in Thousands	Jul. 31, 2018USD ($)
Acquisition of CYS Investments, Inc. [Abstract]
Available-for-sale securities, at fair value	$ 10,034,557
Cash and cash equivalents	386
Restricted cash	1,062
Accrued interest receivable	30,646
Due from counterparties	21,572
Derivative assets, at fair value	314,811
Reverse repurchase agreements	761,460
Other assets	11,947
Total Assets	11,176,441
Repurchase agreements	8,743,527
Derivative liabilities, at fair value	765,837
Due to counterparties	301,287
Accrued interest payable	27,487
Other liabilities	821
Total Liabilities	9,838,959
Cumulative deficit (acquisition transaction costs)	(77,602)
Total Purchase Price	$ 1,415,084

Available-for-Sale Securities_3

Available-for-Sale Securities, at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, at fair value	$ 25,552,604	$ 21,220,819
Available-for-sale securities, at fair value, pledged as collateral for borrowings	25,200,000	21,000,000
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, at fair value	15,812,696	13,920,721
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, at fair value	4,930,963	3,616,967
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, at fair value	941,374	701,037
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, at fair value	$ 3,867,571	$ 2,982,094

Available-for-Sale Securities_4

Available-for-Sale Securities, at Fair Value Nonconsolidated Variable Interest Entities (Details) - Mortgage-backed Securities, Issued by Private Enterprises [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Assets of nonconsolidated Variable Interest Entities	$ 3,900,000	$ 3,000,000
Maximum exposure to loss of nonconsolidated Variable Interest Entities	$ 3,867,572	$ 2,982,094

Schedule of Available-for-sale

Schedule of Available-for-sale Securities Reconciliation (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Principal/Current Face	$ 34,389,050	$ 29,396,680
Unamortized Premium	1,338,210	1,370,959
Accretable Purchase Discount	719,204	700,671
Credit Reserve Purchase Discount	1,322,762	653,613
Amortized Cost	25,432,158	20,856,658
Unrealized Gain	557,048	544,198
Unrealized Loss	436,602	180,037
Available-for-sale securities, at fair value	25,552,604	21,220,819
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Principal/Current Face	23,891,757	20,023,621
Unamortized Premium	1,247,682	1,302,535
Accretable Purchase Discount	25,085	24,638
Credit Reserve Purchase Discount	0	0
Amortized Cost	21,998,387	18,359,746
Unrealized Gain	75,298	53,104
Unrealized Loss	388,652	174,125
Available-for-sale securities, at fair value	21,685,033	18,238,725
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Principal/Current Face	10,497,293	9,373,059
Unamortized Premium	90,528	68,424
Accretable Purchase Discount	694,119	676,033
Credit Reserve Purchase Discount	1,322,762	653,613
Amortized Cost	3,433,771	2,496,912
Unrealized Gain	481,750	491,094
Unrealized Loss	47,950	5,912
Available-for-sale securities, at fair value	3,867,571	2,982,094
Interest-Only-Strip [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Principal/Current Face	3,115,967	2,941,772
Unamortized Premium	209,901	223,289
Accretable Purchase Discount	0	0
Credit Reserve Purchase Discount	0	0
Amortized Cost	209,901	223,289
Unrealized Gain	14,170	10,955
Unrealized Loss	48,655	39,156
Available-for-sale securities, at fair value	175,416	195,088
Interest-Only-Strip [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Principal/Current Face	5,137,169	5,614,925
Unamortized Premium	83,846	65,667
Accretable Purchase Discount	0	0
Credit Reserve Purchase Discount	0	0
Amortized Cost	83,846	65,667
Unrealized Gain	3,655	2,163
Unrealized Loss	3,293	2,746
Available-for-sale securities, at fair value	84,208	65,084
Fixed Income Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Principal/Current Face	20,775,790	17,081,849
Unamortized Premium	1,037,781	1,079,246
Accretable Purchase Discount	25,085	24,638
Credit Reserve Purchase Discount	0	0
Amortized Cost	21,788,486	18,136,457
Unrealized Gain	61,128	42,149
Unrealized Loss	339,997	134,969
Available-for-sale securities, at fair value	21,509,617	18,043,637
Fixed Income Securities [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Principal/Current Face	5,360,124	3,758,134
Unamortized Premium	6,682	2,757
Accretable Purchase Discount	694,119	676,033
Credit Reserve Purchase Discount	1,322,762	653,613
Amortized Cost	3,349,925	2,431,245
Unrealized Gain	478,095	488,931
Unrealized Loss	44,657	3,166
Available-for-sale securities, at fair value	$ 3,783,363	$ 2,917,010

Available-for-sale Securities C

Available-for-sale Securities Classified by Rate Type (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Adjustable Rate	$ 3,494,244	$ 2,645,930
Fixed Rate	22,058,360	18,574,889
Available-for-sale securities, at fair value	25,552,604	21,220,819
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Adjustable Rate	19,073	23,220
Fixed Rate	21,665,960	18,215,505
Available-for-sale securities, at fair value	21,685,033	18,238,725
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Adjustable Rate	3,475,171	2,622,710
Fixed Rate	392,400	359,384
Available-for-sale securities, at fair value	$ 3,867,571	$ 2,982,094

Available-for-Sale Securities_5

Available-for-Sale Securities, Weighted Average Life Classifications (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Less than or equal to 1 year	$ 104,256
Greater than 1 year and less than or equal to 3 years	259,578
Greater than 3 years and less than or equal to 5 years	689,737
Greater than 5 years and less than or equal to 10 years	22,133,662
Greater than 10 years	2,365,371
Available-for-sale securities, at fair value	25,552,604	$ 21,220,819
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Less than or equal to 1 year	6,301
Greater than 1 year and less than or equal to 3 years	124,121
Greater than 3 years and less than or equal to 5 years	260,886
Greater than 5 years and less than or equal to 10 years	19,550,827
Greater than 10 years	1,742,898
Available-for-sale securities, at fair value	21,685,033	18,238,725
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Less than or equal to 1 year	97,955
Greater than 1 year and less than or equal to 3 years	135,457
Greater than 3 years and less than or equal to 5 years	428,851
Greater than 5 years and less than or equal to 10 years	2,582,835
Greater than 10 years	622,473
Available-for-sale securities, at fair value	$ 3,867,571	$ 2,982,094

Schedule of Available-for-sal_2

Schedule of Available-for-sale Securities Reconciliation, Non-Agency Unamortized Net Discount and Designated Credit Reserves (Details) - Mortgage-backed Securities, Issued by Private Enterprises [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale, Designated Credit Reserve [Member]
Debt Securities, Available-for-sale, Unamortized Discount [Roll Forward]
Total discount/premium on available-for-sale securities, beginning balance	$ 653,613	$ 367,437
Acquisitions	737,765	373,051
Accretion of net discount	0	0
Realized credit losses	26,457	17,539
Reclassification adjustment for other-than-temporary impairments	470	789
Transfers from (to)	(42,629)	(66,537)
Sales, calls, other	0	3,588
Total discount/premium on available-for-sale securities, ending balance	1,322,762	653,613
Debt Securities, Available-for-sale, Net Unamortized Discount/Premium [Member]
Debt Securities, Available-for-sale, Unamortized Discount [Roll Forward]
Total discount/premium on available-for-sale securities, beginning balance	607,609	623,440
Acquisitions	60,894	57,732
Accretion of net discount	(89,111)	(88,037)
Realized credit losses	0	0
Reclassification adjustment for other-than-temporary impairments	0	0
Transfers from (to)	42,629	66,537
Sales, calls, other	18,430	52,063
Total discount/premium on available-for-sale securities, ending balance	603,591	607,609
Debt Securities, Available-for-sale, Total Discount/Premium [Member]
Debt Securities, Available-for-sale, Unamortized Discount [Roll Forward]
Total discount/premium on available-for-sale securities, beginning balance	1,261,222	990,877
Acquisitions	798,659	430,783
Accretion of net discount	(89,111)	(88,037)
Realized credit losses	26,457	17,539
Reclassification adjustment for other-than-temporary impairments	470	789
Transfers from (to)	0	0
Sales, calls, other	18,430	55,651
Total discount/premium on available-for-sale securities, ending balance	$ 1,926,353	$ 1,261,222

Available-for-Sale Securities_6

Available-for-Sale Securities, at Fair Value Schedule of Unrealized Loss on Investments (Details) $ in Thousands	Dec. 31, 2018USD ($)position	Dec. 31, 2017USD ($)position
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Number of Positions | position	1,550	1,435
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | position	290	253
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | position	489	234
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 4,386,946	$ 12,198,870
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Percent Agency	71.10%	98.50%
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (66,520)	$ (65,313)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	9,501,123	2,464,544
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(370,082)	(114,724)
Debt Securities, Available-for-sale, Unrealized Loss Position	13,888,069	14,663,414
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(436,602)	(180,037)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 3,100,000	$ 12,000,000

Available-for-Sale Securities_7

Available-for-Sale Securities, at Fair Value Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018USD ($)	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)position	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2018USD ($)position	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)position
Debt Securities, Available-for-sale [Abstract]
Other-than-temporary impairment losses	$ (107)	$ (95)	$ (174)	$ (94)	$ (360)	$ 0	$ (429)	$ 0	$ (470)	$ (789)	$ (1,822)
Other than Temporary Impairment Losses, Investments, Number, Available-for-sale Securities | position					2				3		4
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Market Value	$ 135,500								$ 135,500
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Weighted Average Cumulative Losses	8.80%
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Weighted Average Three-Month Prepayment Speed	0.058
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Delinquency Rate	18.60%
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Weighted Average FICO Score	667
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Cumulative credit loss at beginning of period				$ (6,395)				$ (5,606)	(6,395)	(5,606)	$ (6,499)
Other-than-temporary impairments not previously recognized									(264)	(429)	(1,307)
Increases related to other-than-temporary impairments on securities with previously recognized other-than-temporary impairments									(206)	(360)	(515)
Decreases related to other-than-temporary impairments on securities paid down									0	0	1,387
Decreases related to other-than-temporary impairments on securities sold									0	0	1,328
Cumulative credit loss at end of period	$ (6,865)				$ (6,395)				$ (6,865)	$ (6,395)	$ (5,606)

Available-for-Sale Securities_8

Available-for-Sale Securities, at Fair Value Schedule of Realized Gain (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Securities, Available-for-sale [Abstract]
Proceeds from sales of available-for-sale securities	$ 15,202,406	$ 8,708,941	$ 14,404,458
Amortized cost of available-for-sale securities sold	15,600,000	8,700,000	14,500,000
Gross realized gains	70,076	67,764	97,049
Gross realized losses	(419,638)	(100,255)	(223,277)
Total realized losses on sales, net	$ (349,562)	$ (32,491)	$ (126,228)

Rollforward of Mortgage Servici

Rollforward of Mortgage Servicing Rights, at Fair Value (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Servicing Asset at Fair Value, Amount [Roll Forward]
Mortgage servicing rights, at fair value, at beginning of period	$ 1,086,717	$ 693,815	$ 493,688
Additions from purchases of mortgage servicing rights	988,283	499,866	312,580
Additions from sales of residential mortgage loans	0	20	924
Subtractions from sales of mortgage servicing rights	0	(946)	(61,511)
Changes in valuation inputs or assumptions used in the valuation model	80,209	6,339	16,572
Other changes in fair value	(149,879)	(96,781)	(78,729)
Other changes	(11,890)	(15,596)	10,291
Mortgage servicing rights, at fair value, at end of period	1,993,440	1,086,717	$ 693,815
Mortgage servicing rights, at fair value, pledged as collateral for borrowings	$ 1,100,000	$ 600,000

Schedule of Mortgage Servicing

Schedule of Mortgage Servicing Rights Sensitivity Analysis of Fair Value (Details) $ in Thousands	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Impact on fair value of 10% adverse change in prepayment speed	$ (67,245)	$ (40,100)
Impact on fair value of 20% adverse change in prepayment speed	(130,371)	(77,483)
Impact on fair value of 10% adverse change in delinquency	(6,911)	(4,274)
Impact on fair value of 20% adverse change in delinquency	(13,688)	(8,875)
Impact on fair value of 10% adverse change in discount rate	(62,528)	(35,137)
Impact on fair value of 20% adverse change in discount rate	$ (121,135)	$ (68,246)
Measurement Input, Constant Prepayment Rate [Member]
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Weighted average assumption	0.086	0.098
Measurement Input, Default Rate [Member]
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Weighted average assumption	0.013	0.017
Measurement Input, Discount Rate [Member]
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Weighted average assumption	0.094	0.099

Components of Servicing Revenue

Components of Servicing Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosures Pertaining to Servicing Assets and Servicing Liabilities [Abstract]
Servicing fee income	$ 312,100	$ 197,902	$ 138,430
Ancillary and other fee income	1,280	1,009	1,631
Float income	29,716	10,154	3,518
Servicing income	343,096	209,065	$ 143,579
Servicing advances	$ 39,700	$ 31,100

Serviced Mortgage Assets (Detai

Serviced Mortgage Assets (Details) $ in Thousands	Dec. 31, 2018USD ($)loan	Dec. 31, 2017USD ($)loan
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Number of Loans | loan	720,999	458,133
Unpaid Principal Balance | $	$ 165,529,153	$ 104,002,292
Servicing Contracts [Member]
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Number of Loans | loan	717,167	454,028
Unpaid Principal Balance | $	$ 163,102,308	$ 101,344,054
Loans in Securitization Trusts, Residential Mortgages [Member]
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Number of Loans | loan	3,612	3,845
Unpaid Principal Balance | $	$ 2,392,471	$ 2,618,016
Other Assets [Member]
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Number of Loans | loan	220	260
Unpaid Principal Balance | $	$ 34,374	$ 40,222

Schedule of Restricted Cash and

Schedule of Restricted Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 688,006	$ 635,836
Restricted Cash and Cash Equivalents Held for Securities Trading Activity [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	51,350	27,050
Restricted Cash and Cash Equivalents Held for Derivatives Trading Activity [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	219,900	191,421
Restricted Cash and Cash Equivalents Pledged as Restricted Collateral for Borrowings [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	416,696	417,018
Restricted Cash and Cash Equivalents Held by Counterparties [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	687,946	635,489
Restricted Cash and Cash Equivalents for Lease [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 60	$ 347

Schedule of Total Cash, Cash Eq

Schedule of Total Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	$ 409,758	$ 419,159
Restricted cash	688,006	635,836
Total cash, cash equivalents and restricted cash	$ 1,097,764	$ 1,054,995	$ 815,195	$ 1,000,393

Schedule of Derivative Instrume

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Notional Disclosures [Abstract]
Notional	$ 36,528,169,000	$ 31,226,878,000	$ 18,802,500,000
Inverse Interest-Only Securities [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	70,813,000	91,827,000
Total Return Swap [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	(383,000)	(106,000)
Notional Disclosures [Abstract]
Notional	48,265,000	63,507,000
Short US Treasury Securities [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	(781,500,000)	0
Derivative Financial Instruments, Assets [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	319,981,000	309,918,000
Notional Disclosures [Abstract]
Notional	36,258,904,000	25,503,371,000
Derivative Financial Instruments, Assets [Member] | Inverse Interest-Only Securities [Member]
Notional Disclosures [Abstract]
Notional	476,299,000	588,246,000
Derivative Financial Instruments, Assets [Member] | Interest Rate Swap [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	187,231,000	206,773,000
Notional Disclosures [Abstract]
Notional	26,798,605,000	21,516,125,000
Derivative Financial Instruments, Assets [Member] | Interest Rate Cap [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	40,335,000
Notional Disclosures [Abstract]
Notional	2,500,000,000
Derivative Financial Instruments, Assets [Member] | Interest Rate Swaption [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	0	10,405,000
Notional Disclosures [Abstract]
Notional	0	2,666,000,000
Derivative Financial Instruments, Assets [Member] | Forward Contracts [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	21,602,000	913,000
Notional Disclosures [Abstract]
Notional	6,484,000,000	733,000,000
Derivative Financial Instruments, Assets [Member] | Options Held [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	0	0
Notional Disclosures [Abstract]
Notional	0
Derivative Financial Instruments, Assets [Member] | Total Return Swap [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	0	0
Notional Disclosures [Abstract]
Notional	0	0
Derivative Financial Instruments, Assets [Member] | Short US Treasury Securities [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	0
Notional Disclosures [Abstract]
Notional	0
Derivative Financial Instruments, Liabilities [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	(820,590,000)	(31,903,000)
Notional Disclosures [Abstract]
Notional	5,403,265,000	8,335,507,000
Derivative Financial Instruments, Liabilities [Member] | Inverse Interest-Only Securities [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	0	0
Notional Disclosures [Abstract]
Notional	0	0
Derivative Financial Instruments, Liabilities [Member] | Interest Rate Swap [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	0	(29,867,000)
Notional Disclosures [Abstract]
Notional	2,725,000,000	6,966,000,000
Derivative Financial Instruments, Liabilities [Member] | Interest Rate Cap [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	0
Notional Disclosures [Abstract]
Notional	0
Derivative Financial Instruments, Liabilities [Member] | Interest Rate Swaption [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	(13,456,000)	0
Notional Disclosures [Abstract]
Notional	63,000,000	0
Derivative Financial Instruments, Liabilities [Member] | Forward Contracts [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	0	(1,930,000)
Notional Disclosures [Abstract]
Notional	0	1,306,000,000
Derivative Financial Instruments, Liabilities [Member] | Options Held [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	(25,296,000)	0
Notional Disclosures [Abstract]
Notional	1,767,000,000
Derivative Financial Instruments, Liabilities [Member] | Total Return Swap [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	(383,000)	(106,000)
Notional Disclosures [Abstract]
Notional	48,265,000	63,507,000
Derivative Financial Instruments, Liabilities [Member] | Short US Treasury Securities [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	$ (781,455,000)	$ 0

Schedule of Derivative Instru_2

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	$ (38,814)	$ (79,912)	$ 147,168
Forward Contracts [Member] | (Loss) gain on other derivative instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	(12,521)	(46,778)	51,816
Short US Treasury Securities [Member] | (Loss) gain on other derivative instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	(26,988)	0	0
Options Held [Member] | (Loss) gain on other derivative instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	(18,457)	(22,623)	64,920
Interest Rate Swap [Member] | Long [Member] | Gain (loss) on interest rate swap, cap and swaption agreements
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	48,995	67,124	(3,110)
Interest Rate Swap [Member] | Short [Member] | Gain (loss) on interest rate swap, cap and swaption agreements
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	(74,407)	(17,677)	37,272
Interest Rate Swaption [Member] | Gain (loss) on interest rate swap, cap and swaption agreements
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	45,954	(59,200)	11,209
Interest Rate Cap [Member] | Gain (loss) on interest rate swap, cap and swaption agreements
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	(4,499)	0	0
Total Return Swap [Member] | (Loss) gain on other derivative instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	125	(870)	(36,898)
Credit Default Swap, Selling Protection [Member] | (Loss) gain on other derivative instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	0	0	962
Inverse Interest-Only Securities [Member] | (Loss) gain on other derivative instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	2,984	112	18,579
Forward Purchase Commitments [Member] | (Loss) gain on other derivative instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	$ 0	$ 0	$ 2,418

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities Interest Spread on Interest Rate Swaps and Caps (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Average Notional Amount	$ 31,823,176,000	$ 19,953,655,000
Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net interest expense (income) on interest rate swaps and caps	49,200,000	(8,800,000)	$ (21,100,000)
Net Long Position [Member] | Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Notional Amount	$ 29,400,000,000	$ 19,400,000,000	$ 15,500,000,000

Schedule of Notional Amounts of

Schedule of Notional Amounts of Derivative Positions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Derivative, Notional Amount [Roll Forward]
Beginning of Period Notional Amount	$ 31,226,878,000	$ 18,802,500,000
Additions	115,471,781,000	38,158,845,000
Settlement, Termination, Expiration or Exercise	(110,170,490,000)	(25,734,467,000)
End of Period Notional Amount	36,528,169,000	31,226,878,000
Average Notional Amount	31,823,176,000	19,953,655,000
Realized Gain (Loss), net	(32,659,000)	31,149,000
Inverse Interest-Only Securities [Member]
Derivative, Notional Amount [Roll Forward]
Additions	0	0
Settlement, Termination, Expiration or Exercise	(111,947,000)	(152,598,000)
Realized Gain (Loss), net	0	(40,000)
Interest Rate Swap [Member]
Derivative, Notional Amount [Roll Forward]
Additions	49,269,781,000	36,642,245,000
Settlement, Termination, Expiration or Exercise	(48,228,301,000)	(28,531,183,000)
Realized Gain (Loss), net	(71,578,000)	54,476,000
Interest Rate Cap [Member]
Derivative, Notional Amount [Roll Forward]
Additions	2,500,000,000
Settlement, Termination, Expiration or Exercise	0
Realized Gain (Loss), net	0
Interest Rate Swaption [Member]
Derivative, Notional Amount [Roll Forward]
Additions	(35,000,000)	4,306,000,000
Settlement, Termination, Expiration or Exercise	(2,568,000,000)	(1,865,000,000)
Realized Gain (Loss), net	67,985,000	8,694,000
Forward Contracts [Member]
Derivative, Notional Amount [Roll Forward]
Additions	64,988,000,000	(7,249,400,000)
Settlement, Termination, Expiration or Exercise	(57,931,000,000)	8,165,400,000
Realized Gain (Loss), net	(35,140,000)	(51,810,000)
Short US Treasury Securities [Member]
Derivative, Notional Amount [Roll Forward]
Additions	(800,000,000)
Settlement, Termination, Expiration or Exercise	0
Realized Gain (Loss), net	0
Options Held [Member]
Derivative, Notional Amount [Roll Forward]
Additions	(451,000,000)	4,460,000,000
Settlement, Termination, Expiration or Exercise	(1,316,000,000)	(3,324,000,000)
Realized Gain (Loss), net	6,839,000	20,010,000
Total Return Swap [Member]
Derivative, Notional Amount [Roll Forward]
Beginning of Period Notional Amount	63,507,000
Additions	0	0
Settlement, Termination, Expiration or Exercise	(15,242,000)	(27,086,000)
End of Period Notional Amount	48,265,000	63,507,000
Realized Gain (Loss), net	(765,000)	(181,000)
Net Long Position [Member] | Inverse Interest-Only Securities [Member]
Derivative, Notional Amount [Roll Forward]
Beginning of Period Notional Amount	588,246,000	740,844,000
End of Period Notional Amount	476,299,000	588,246,000
Average Notional Amount	530,509,000	662,273,000
Net Long Position [Member] | Interest Rate Swap [Member]
Derivative, Notional Amount [Roll Forward]
Beginning of Period Notional Amount	28,482,125,000	20,371,063,000
End of Period Notional Amount	29,523,605,000	28,482,125,000
Average Notional Amount	28,317,793,000	19,447,067,000
Net Long Position [Member] | Interest Rate Cap [Member]
Derivative, Notional Amount [Roll Forward]
Beginning of Period Notional Amount	0
End of Period Notional Amount	2,500,000,000	0
Average Notional Amount	1,054,795,000
Net Long Position [Member] | Interest Rate Swaption [Member]
Derivative, Notional Amount [Roll Forward]
Beginning of Period Notional Amount	2,666,000,000	225,000,000
End of Period Notional Amount	63,000,000	2,666,000,000
Average Notional Amount		1,014,578,000
Net Long Position [Member] | Forward Contracts [Member]
Derivative, Notional Amount [Roll Forward]
End of Period Notional Amount	6,484,000,000
Average Notional Amount	4,502,888,000
Net Long Position [Member] | Short US Treasury Securities [Member]
Derivative, Notional Amount [Roll Forward]
Beginning of Period Notional Amount	0
End of Period Notional Amount		0
Net Long Position [Member] | Options Held [Member]
Derivative, Notional Amount [Roll Forward]
Beginning of Period Notional Amount	0
End of Period Notional Amount		0
Net Long Position [Member] | Total Return Swap [Member]
Derivative, Notional Amount [Roll Forward]
Beginning of Period Notional Amount	63,507,000	90,593,000
End of Period Notional Amount	48,265,000	63,507,000
Average Notional Amount	55,143,000	74,183,000
Net Short Position [Member] | Interest Rate Swaption [Member]
Derivative, Notional Amount [Roll Forward]
Average Notional Amount	1,495,421,000
Net Short Position [Member] | Forward Contracts [Member]
Derivative, Notional Amount [Roll Forward]
Beginning of Period Notional Amount	573,000,000	1,489,000,000
End of Period Notional Amount		573,000,000
Average Notional Amount		1,256,424,000
Net Short Position [Member] | Short US Treasury Securities [Member]
Derivative, Notional Amount [Roll Forward]
End of Period Notional Amount	800,000,000
Average Notional Amount	337,534,000
Net Short Position [Member] | Options Held [Member]
Derivative, Notional Amount [Roll Forward]
Beginning of Period Notional Amount	0	1,136,000,000
End of Period Notional Amount	1,767,000,000	0
Average Notional Amount	$ 804,997,000	$ 11,978,000

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities Interest Rate Sensitive Assets/Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Available-for-sale securities, at fair value	$ 25,552,604	$ 21,220,819
Mortgage servicing rights, at fair value	1,993,440	1,086,717	$ 693,815	$ 493,688
Interest-Only-Strip [Member]
Derivatives, Fair Value [Line Items]
Available-for-sale securities, at fair value	$ 147,600	$ 117,800

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities Schedule of TBA Contracts (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Notional	$ 36,528,169,000	$ 31,226,878,000	$ 18,802,500,000
Derivative Financial Instruments, Assets [Member]
Derivative [Line Items]
Notional	36,258,904,000	25,503,371,000
Fair Value	319,981,000	309,918,000
Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Notional	5,403,265,000	8,335,507,000
Fair Value	(820,590,000)	(31,903,000)
Forward Contracts [Member] | Derivative Financial Instruments, Assets [Member]
Derivative [Line Items]
Notional	6,484,000,000	733,000,000
Fair Value	21,602,000	913,000
Forward Contracts [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Notional	0	1,306,000,000
Fair Value	0	(1,930,000)
Forward Contracts [Member] | Long [Member]
Derivative [Line Items]
Notional	6,484,000,000	733,000,000
Cost Basis	6,734,858,000	769,446,000
Market Value	6,756,460,000	770,359,000
Forward Contracts [Member] | Long [Member] | Derivative Financial Instruments, Assets [Member]
Derivative [Line Items]
Fair Value	21,602,000	913,000
Forward Contracts [Member] | Long [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Fair Value	0	0
Forward Contracts [Member] | Short [Member]
Derivative [Line Items]
Notional	0	1,306,000,000
Cost Basis	0	1,316,368,000
Market Value	0	1,318,297,000
Forward Contracts [Member] | Short [Member] | Derivative Financial Instruments, Assets [Member]
Derivative [Line Items]
Fair Value	0	0
Forward Contracts [Member] | Short [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Fair Value	0	(1,930,000)
Forward Contracts [Member] | Net Long Position [Member]
Derivative [Line Items]
Notional	6,484,000,000
Cost Basis	6,734,858,000
Market Value	6,756,460,000
Forward Contracts [Member] | Net Long Position [Member] | Derivative Financial Instruments, Assets [Member]
Derivative [Line Items]
Fair Value	21,602,000
Forward Contracts [Member] | Net Long Position [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Fair Value	$ 0
Forward Contracts [Member] | Net Short Position [Member]
Derivative [Line Items]
Notional		573,000,000	$ 1,489,000,000
Cost Basis		546,922,000
Market Value		547,938,000
Forward Contracts [Member] | Net Short Position [Member] | Derivative Financial Instruments, Assets [Member]
Derivative [Line Items]
Fair Value		913,000
Forward Contracts [Member] | Net Short Position [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Fair Value		$ (1,930,000)

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities Short U.S. Treasury Securities (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Notional	$ 36,528,169,000	$ 31,226,878,000	$ 18,802,500,000
Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Notional	5,403,265,000	8,335,507,000
Fair Value	(820,590,000)	(31,903,000)
Short US Treasury Securities [Member]
Derivative [Line Items]
Fair Value	(781,500,000)	0
Short US Treasury Securities [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Fair Value	(781,455,000)	0
Short US Treasury Securities [Member] | Short [Member]
Derivative [Line Items]
Notional	$ 800,000,000	$ 0

Derivative Instruments and He_7

Derivative Instruments and Hedging Activities Put and Call Options for TBAs (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Notional	$ 36,528,169,000	$ 31,226,878,000	$ 18,802,500,000
Derivative Financial Instruments, Assets [Member]
Derivative [Line Items]
Notional	36,258,904,000	25,503,371,000
Fair Value	319,981,000	309,918,000
Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Notional	5,403,265,000	8,335,507,000
Fair Value	(820,590,000)	(31,903,000)
Options Held [Member] | Derivative Financial Instruments, Assets [Member]
Derivative [Line Items]
Notional	0
Fair Value	0	0
Options Held [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Notional	1,767,000,000
Fair Value	(25,296,000)	0
Options Held [Member] | Long [Member]
Derivative [Line Items]
Notional	5,400,000,000	0
Options Held [Member] | Short [Member]
Derivative [Line Items]
Notional	$ 7,200,000,000	$ 0

Derivative Instruments and He_8

Derivative Instruments and Hedging Activities Schedule of Interest Rate Swap Payers (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Notional	$ 36,528,169,000	$ 31,226,878,000	$ 18,802,500,000
Interest Rate Swap [Member] | Long [Member]
Derivative [Line Items]
Notional	$ 21,406,167,000	$ 22,920,135,000
Weighted Average Variable Interest Rate	2.651%	1.493%
Weighted Average Remaining Maturity	3 years 9 months	3 years 3 days
Weighted Average Fixed Interest Rate	1.978%	1.694%
Interest Rate Swap [Member] | Derivative Maturity Within One Year From Balance Sheet Date [Member] | Long [Member]
Derivative [Line Items]
Notional	$ 4,336,897,000	$ 4,320,000,000
Weighted Average Variable Interest Rate	2.565%	1.508%
Weighted Average Remaining Maturity	24 days	15 days
Weighted Average Fixed Interest Rate	1.769%	1.155%
Interest Rate Swap [Member] | Derivative Maturity Over One And Within Two Years From Balance Sheet Date [Member] | Long [Member]
Derivative [Line Items]
Notional	$ 3,640,000,000	$ 5,448,135,000
Weighted Average Variable Interest Rate	2.689%	1.386%
Weighted Average Remaining Maturity	1 year 9 months 29 days	1 year 9 months 14 days
Weighted Average Fixed Interest Rate	1.806%	1.767%
Interest Rate Swap [Member] | Derivative Maturity Over Two And Within Three Years From Balance Sheet Date [Member] | Long [Member]
Derivative [Line Items]
Notional	$ 4,117,000,000	$ 5,490,000,000
Weighted Average Variable Interest Rate	2.687%	1.509%
Weighted Average Remaining Maturity	2 years 8 months 8 days	2 years 10 months 13 days
Weighted Average Fixed Interest Rate	1.55%	1.945%
Interest Rate Swap [Member] | Derivative Maturity Over Three And Within Four Years From Balance Sheet Date [Member] | Long [Member]
Derivative [Line Items]
Notional	$ 2,470,000,000	$ 2,417,000,000
Weighted Average Variable Interest Rate	2.728%	1.628%
Weighted Average Remaining Maturity	3 years 9 months	3 years 11 months 1 day
Weighted Average Fixed Interest Rate	2.002%	1.788%
Interest Rate Swap [Member] | Derivative Maturity Over Four Years From Balance Sheet Date [Member] | Long [Member]
Derivative [Line Items]
Notional	$ 6,842,270,000	$ 5,245,000,000
Weighted Average Variable Interest Rate	2.636%	1.516%
Weighted Average Remaining Maturity	7 years 7 months 6 days	6 years 5 months 8 days
Weighted Average Fixed Interest Rate	2.495%	1.764%
Forward Starting Interest Rate Swap [Member]
Derivative [Line Items]
Notional	$ 572,000,000	$ 570,000,000
Weighted Average Fixed Interest Rate	2.80%	2.10%

Derivative Instruments and He_9

Derivative Instruments and Hedging Activities Schedule of Interest Rate Swap Receivers (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Notional	$ 36,528,169,000	$ 31,226,878,000	$ 18,802,500,000
Interest Rate Swap [Member] | Short [Member]
Derivative [Line Items]
Notional	$ 8,117,438,000	$ 5,561,990,000
Weighted Average Variable Interest Rate	2.612%	1.462%
Weighted Average Fixed Interest Rate	2.757%	2.211%
Weighted Average Remaining Maturity	5 years 2 months 19 days	7 years 7 months 28 days
Interest Rate Swap [Member] | Derivative Maturity Over One And Within Two Years From Balance Sheet Date [Member] | Short [Member]
Derivative [Line Items]
Notional	$ 250,000,000
Weighted Average Variable Interest Rate	2.469%
Weighted Average Fixed Interest Rate	2.258%
Weighted Average Remaining Maturity	1 year 21 days
Interest Rate Swap [Member] | Derivative Maturity Over Two And Within Three Years From Balance Sheet Date [Member] | Short [Member]
Derivative [Line Items]
Notional	$ 2,477,438,000	$ 200,000,000
Weighted Average Variable Interest Rate	2.538%	1.391%
Weighted Average Fixed Interest Rate	2.736%	1.642%
Weighted Average Remaining Maturity	2 years 2 months 26 days	2 years 7 months 6 days
Interest Rate Swap [Member] | Derivative Maturity Over Three And Within Four Years From Balance Sheet Date [Member] | Short [Member]
Derivative [Line Items]
Notional	$ 800,000,000	$ 500,000,000
Weighted Average Variable Interest Rate	2.653%	1.357%
Weighted Average Fixed Interest Rate	2.975%	1.327%
Weighted Average Remaining Maturity	3 years 4 months 20 days	3 years 18 days
Interest Rate Swap [Member] | Derivative Maturity Over Four Years From Balance Sheet Date [Member] | Short [Member]
Derivative [Line Items]
Notional	$ 4,590,000,000	$ 4,861,990,000
Weighted Average Variable Interest Rate	2.653%	1.475%
Weighted Average Fixed Interest Rate	2.757%	2.325%
Weighted Average Remaining Maturity	7 years 4 months 13 days	8 years 4 months 2 days

Derivative Instruments and H_10

Derivative Instruments and Hedging Activities Schedule of Interest Rate Swaptions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Notional	$ (36,528,169,000)	$ (31,226,878,000)	$ (18,802,500,000)
Interest Rate Swaption [Member] | Long [Member] | Variable Income Interest Rate [Member]
Derivative [Line Items]
Cost Basis	(13,255,000)
Fair Value	$ 8,422,000
Weighted Average Remaining Maturity	7 months 28 days
Interest Rate Swaption [Member] | Long [Member] | Variable Income Interest Rate [Member] | Less Than Six Months Remaining Maturity [Member]
Derivative [Line Items]
Cost Basis	$ (4,855,000)	(21,380,000)
Fair Value	$ 2,430,000	$ 17,736,000
Weighted Average Remaining Maturity	5 months 4 days	4 months 1 day
Interest Rate Swaption [Member] | Long [Member] | Variable Income Interest Rate [Member] | Six Months or Longer Remaining Maturity [Member]
Derivative [Line Items]
Cost Basis	$ (8,400,000)
Fair Value	$ 5,992,000
Weighted Average Remaining Maturity	8 months 18 days
Interest Rate Swaption [Member] | Long [Member] | Fixed Income Interest Rate [Member] | Less Than Six Months Remaining Maturity [Member]
Derivative [Line Items]
Cost Basis		$ (4,660,000)
Fair Value		$ 2,982,000
Weighted Average Remaining Maturity		3 months 22 days
Interest Rate Swaption [Member] | Short [Member] | Variable Income Interest Rate [Member] | Less Than Six Months Remaining Maturity [Member]
Derivative [Line Items]
Cost Basis		$ (7,950,000)
Fair Value		$ 5,619,000
Weighted Average Remaining Maturity		4 months 20 days
Interest Rate Swaption [Member] | Short [Member] | Fixed Income Interest Rate [Member]
Derivative [Line Items]
Cost Basis	$ (13,255,000)
Fair Value	$ (21,878,000)
Weighted Average Remaining Maturity	7 months 16 days
Interest Rate Swaption [Member] | Short [Member] | Fixed Income Interest Rate [Member] | Less Than Six Months Remaining Maturity [Member]
Derivative [Line Items]
Cost Basis	$ (4,855,000)	$ (16,260,000)
Fair Value	$ (9,001,000)	$ 4,694,000
Weighted Average Remaining Maturity	4 months 24 days	5 months 5 days
Interest Rate Swaption [Member] | Short [Member] | Fixed Income Interest Rate [Member] | Six Months or Longer Remaining Maturity [Member]
Derivative [Line Items]
Cost Basis	$ (8,400,000)
Fair Value	$ (12,877,000)
Weighted Average Remaining Maturity	8 months 18 days
Underlying Swap [Member] | Long [Member] | Variable Income Interest Rate [Member]
Derivative [Line Items]
Weighted Average Remaining Maturity	10 years
Notional	$ (1,700,000,000)
Underlying Swap [Member] | Long [Member] | Variable Income Interest Rate [Member] | London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Weighted Average Fixed Interest Rate	3.15%
Underlying Swap [Member] | Long [Member] | Variable Income Interest Rate [Member] | Less Than Six Months Remaining Maturity [Member]
Derivative [Line Items]
Weighted Average Remaining Maturity	10 years	3 years 9 months 18 days
Notional	$ (900,000,000)	$ (7,200,000,000)
Underlying Swap [Member] | Long [Member] | Variable Income Interest Rate [Member] | Less Than Six Months Remaining Maturity [Member] | London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Weighted Average Fixed Interest Rate	3.16%	2.27%
Underlying Swap [Member] | Long [Member] | Variable Income Interest Rate [Member] | Six Months or Longer Remaining Maturity [Member]
Derivative [Line Items]
Weighted Average Remaining Maturity	10 years
Notional	$ (800,000,000)
Underlying Swap [Member] | Long [Member] | Variable Income Interest Rate [Member] | Six Months or Longer Remaining Maturity [Member] | London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Weighted Average Fixed Interest Rate	3.14%
Underlying Swap [Member] | Long [Member] | Fixed Income Interest Rate [Member] | Less Than Six Months Remaining Maturity [Member]
Derivative [Line Items]
Weighted Average Remaining Maturity		10 years
Notional		$ (2,300,000,000)
Weighted Average Fixed Interest Rate		2.10%
Underlying Swap [Member] | Short [Member] | Variable Income Interest Rate [Member] | Less Than Six Months Remaining Maturity [Member]
Derivative [Line Items]
Weighted Average Remaining Maturity		10 years
Notional		$ (1,693,000,000)
Underlying Swap [Member] | Short [Member] | Variable Income Interest Rate [Member] | Less Than Six Months Remaining Maturity [Member] | London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Weighted Average Fixed Interest Rate		2.70%
Underlying Swap [Member] | Short [Member] | Fixed Income Interest Rate [Member]
Derivative [Line Items]
Weighted Average Remaining Maturity	10 years
Notional	$ (1,637,000,000)
Underlying Swap [Member] | Short [Member] | Fixed Income Interest Rate [Member] | London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Weighted Average Fixed Interest Rate	2.65%
Underlying Swap [Member] | Short [Member] | Fixed Income Interest Rate [Member] | Less Than Six Months Remaining Maturity [Member]
Derivative [Line Items]
Weighted Average Remaining Maturity	10 years	5 years 7 months 6 days
Notional	$ (845,000,000)	$ (5,141,000,000)
Underlying Swap [Member] | Short [Member] | Fixed Income Interest Rate [Member] | Less Than Six Months Remaining Maturity [Member] | London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Weighted Average Fixed Interest Rate	2.66%	1.89%
Underlying Swap [Member] | Short [Member] | Fixed Income Interest Rate [Member] | Six Months or Longer Remaining Maturity [Member]
Derivative [Line Items]
Weighted Average Remaining Maturity	10 years
Notional	$ (792,000,000)
Underlying Swap [Member] | Short [Member] | Fixed Income Interest Rate [Member] | Six Months or Longer Remaining Maturity [Member] | London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Weighted Average Fixed Interest Rate	2.64%

Derivative Instruments and H_11

Derivative Instruments and Hedging Activities Schedule of Interest Rate Caps (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Notional	$ 36,528,169,000	$ 31,226,878,000	$ 18,802,500,000
Interest Rate Cap [Member] | Long [Member]
Derivative [Line Items]
Notional	$ 2,500,000,000
Derivative, Average Cap Interest Rate	1.28%
Weighted Average Variable Interest Rate	2.656%
Weighted Average Remaining Maturity	1 year 14 days
Derivative Maturity Within One Year From Balance Sheet Date [Member] | Interest Rate Cap [Member] | Long [Member]
Derivative [Line Items]
Notional	$ 800,000,000
Derivative, Average Cap Interest Rate	1.344%
Weighted Average Variable Interest Rate	2.422%
Weighted Average Remaining Maturity	16 days
Derivative Maturity Over One And Within Two Years From Balance Sheet Date [Member] | Interest Rate Cap [Member] | Long [Member]
Derivative [Line Items]
Notional	$ 1,700,000,000
Derivative, Average Cap Interest Rate	1.25%
Weighted Average Variable Interest Rate	2.766%
Weighted Average Remaining Maturity	1 year 3 months 14 days

Derivative Instruments and H_12

Derivative Instruments and Hedging Activities Schedule of Total Return Swaps (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Notional	$ 36,528,169,000	$ 31,226,878,000	$ 18,802,500,000
Total Return Swap [Member]
Derivative [Line Items]
Notional	48,265,000	63,507,000
Fair Value	(383,000)	(106,000)
Cost Basis	(59,000)	567,000
Derivative, Unrealized Gains (Losses)	(324,000)	(673,000)
Total Return Swap [Member] | Maturity Date, 1/12/2043 [Member]
Derivative [Line Items]
Notional	21,395,000	24,362,000
Fair Value	(153,000)	(24,000)
Cost Basis	(30,000)	201,000
Derivative, Unrealized Gains (Losses)	(123,000)	(225,000)
Total Return Swap [Member] | Maturity Date, 1/12/2044 [Member]
Derivative [Line Items]
Notional	26,870,000	39,145,000
Fair Value	(230,000)	(82,000)
Cost Basis	(29,000)	366,000
Derivative, Unrealized Gains (Losses)	$ (201,000)	$ (448,000)

Derivative Instruments and H_13

Derivative Instruments and Hedging Activities Credit Risk - Counterparty Exposure (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative assets, at fair value	$ 319,981	$ 309,918
Derivative liabilities, at fair value	$ (820,590)	$ (31,903)

Offsetting Assets and Liabili_3

Offsetting Assets and Liabilities Offsetting Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Offsetting [Abstract]
Gross amount of recognized derivative assets	$ 599,573	$ 340,576
Gross amount of derivative liabilities offset against derivative assets in the balance sheet	279,592	30,658
Net amount of derivative assets presented in the balance sheet	319,981	309,918
Gross amount of derivative liabilities not offset against derivative assets in the balance sheet	58,775	31,903
Gross amount of cash collateral received not offset against derivative assets in the balance sheet	0	0
Net amount of derivative assets after effects of amounts offset and not offset in the balance sheet	261,206	278,015
Gross amount of recognized reverse repurchase agreements	761,815
Gross amount of financial liabilities offset against reverse repurchase agreements in the balance sheet	0
Net amount of reverse repurchase agreements presented in the balance sheet	761,815
Gross amount of financial liabilities not offset against reverse repurchase agreements in the balance sheet	(761,815)
Gross amount of cash collateral received not offset against reverse repurchase agreements in the balance sheet	0
Securities Purchased under Agreements to Resell, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	0
Gross amount of recognized assets subject to master netting arrangements or similar agreements	1,361,388	340,576
Gross amount of liabilities offset against assets subject to master netting arrangements or similar agreements in the balance sheet	279,592	30,658
Net amount of assets subject to master netting arrangements or similar agreements presented in the balance sheet	1,081,796	309,918
Gross amount of liabilities not offset against assets subject to master netting arrangements or similar agreements in the balance sheet	820,590	31,903
Gross amount of cash collateral received not offset against assets subject to master netting arrangements or similar agreements in the balance sheet	0	0
Net amount of assets subject to master netting arrangements or similar agreements after effects of amounts offset and not offset in the balance sheet	261,206	278,015
Gross amount of recognized repurchase agreements	23,133,476	19,451,207
Gross amount of financial assets offset against repurchase agreements in the balance sheet	0	0
Net amount of repurchase agreements presented in the balance sheet	23,133,476	19,451,207
Gross amount of financial assets not offset against repurchase agreements in the balance sheet	23,133,476	19,451,207
Gross amount of cash collateral pledged not offset against repurchase agreements in the balance sheet	0	0
Net amount of repurchase agreements after effects of amounts offset and not offset in the balance sheet	0	0
Gross amount of recognized derivative liabilities	1,100,182	62,561
Gross amount of derivative assets offset against derivative liabilities in the balance sheet	279,592	30,658
Net amount of derivative liabilities presented in the balance sheet	820,590	31,903
Gross amount of derivatives assets not offset against derivative liabilities in the balance sheet	820,590	31,903
Gross amount of cash collateral pledged not offset against derivative liabilities in the balance sheet	0	0
Net amount of derivative liabilities after effects of amounts offset and not offset in the balance sheet	0	0
Gross amount of recognized liabilities subject to master netting arrangements or similar agreements	24,233,658	19,513,768
Gross amount of assets offset against liabilities subject to master netting arrangements or similar agreements in the balance sheet	279,592	30,658
Net amount of liabilities subject to master netting arrangements or similar agreements presented in the balance sheet	23,954,066	19,483,110
Gross amount of assets not offset against liabilities subject to master netting arrangements or similar agreements in the balance sheet	23,954,066	19,483,110
Gross amount of cash collateral pledged not offset against liabilities subject to master netting arrangements or similar agreements in the balance sheet	0	0
Net amount of liabilities subject to master netting arrangements or similar agreements after effects of amounts offset and not offset in the balance sheet	$ 0	$ 0

Fair Value, Measurement Inputs,

Fair Value, Measurement Inputs, Disclosure (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale, Categorized as Level 2 Assets	99.60%
Debt Securities, Available-for-sale, Categorized as Level 3 Assets	0.40%
Assets Reported at Fair Value, Debt Securities, Available-for-sale	91.70%
Mortgage Servicing Rights Categorized as Level 3 Assets	100.00%
Interest Rate Swaps, Swaptions and Credit Default Swaps Categorized as Level 2 Assets (Liabilities)	100.00%
Short U.S. Treasury and Inverse Interest-only Securities Categorized as Level 2 Assets	100.00%
Agency To-be-Announced Securities Categorized as Level 1 Assets (Liabilities)	100.00%
Mortgage servicing rights	$ 1,993,440	$ 1,086,717	$ 693,815	$ 493,688
Derivative assets, at fair value	319,981	309,918
Derivative liabilities, at fair value	820,590	31,903
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	25,552,604	21,220,819
Mortgage servicing rights	1,993,440	1,086,717
Derivative assets, at fair value	319,981	309,918
Other assets		29,413
Total assets	27,866,025	22,646,867
Derivative liabilities, at fair value	820,590	31,903
Total liabilities	820,590	31,903
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Mortgage servicing rights	0	0
Derivative assets, at fair value	21,602	913
Other assets		29,413
Total assets	21,602	30,326
Derivative liabilities, at fair value	0	1,930
Total liabilities	0	1,930
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	25,447,447	21,067,678
Mortgage servicing rights	0	0
Derivative assets, at fair value	298,379	309,005
Other assets		0
Total assets	25,745,826	21,376,683
Derivative liabilities, at fair value	820,590	29,973
Total liabilities	820,590	29,973
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	105,157	153,141
Mortgage servicing rights	1,993,440	1,086,717
Derivative assets, at fair value	0	0
Other assets		0
Total assets	2,098,597	1,239,858
Derivative liabilities, at fair value	0	0
Total liabilities	$ 0	$ 0

Fair Value, Assets Measured on

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Available-for-sale Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning of period level 3 fair value	$ 153,141	$ 0
Realized (losses) gains	(2,538)	0
Unrealized (losses) gains	0	0
Total gains (losses) included in net income	(2,538)	0
Other comprehensive (loss) income	(1,960)
Purchases	17,861	153,000
Sales	0	0
Settlements	(153,000)	0
Gross transfers into level 3	91,653	0
Gross transfers out of level 3	0	0
End of period level 3 fair value	105,157	153,141
Available-for-sale Securities [Member] | Other Comprehensive Income (Loss) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period	(1,818)	141
Available-for-sale Securities [Member] | Other Income (Loss) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period		0
Servicing Contracts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning of period level 3 fair value	1,086,717	693,815
Realized (losses) gains	(149,242)	(97,372)
Unrealized (losses) gains	80,209	6,339
Total gains (losses) included in net income	(69,033)	(91,033)
Other comprehensive (loss) income	0	0
Purchases	988,283	499,886
Sales	(637)	(355)
Settlements	(11,890)	(15,596)
Gross transfers into level 3	0	0
Gross transfers out of level 3	0	0
End of period level 3 fair value	1,993,440	1,086,717
Servicing Contracts [Member] | Other Comprehensive Income (Loss) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period	0	0
Servicing Contracts [Member] | Other Income (Loss) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period	$ 68,518	$ 5,870

Fair Value, Quantitative Inform

Fair Value, Quantitative Information about Level 3 Fair Value Measurements (Details)	Dec. 31, 2018	Dec. 31, 2017
Measurement Input, Constant Prepayment Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value measurement input	0.086	0.098
Measurement Input, Constant Prepayment Rate [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value measurement input	0.076	0.082
Measurement Input, Constant Prepayment Rate [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value measurement input	0.096	0.112
Measurement Input, Default Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value measurement input	0.013	0.017
Measurement Input, Default Rate [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value measurement input	0.010	0.013
Measurement Input, Default Rate [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value measurement input	0.015	0.020
Measurement Input, Discount Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value measurement input	0.094	0.099
Measurement Input, Discount Rate [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value measurement input	0.082	0.083
Measurement Input, Discount Rate [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value measurement input	0.107	0.112

Fair Value, Option, Quantitativ

Fair Value, Option, Quantitative Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Option, Quantitative Disclosures [Line Items]
Total included in net income	$ 42,996	$ 24,430
Change in fair value due to credit risk	0	0
Residential mortgage loans held-for-investment in securitization trusts
Fair Value, Option, Quantitative Disclosures [Line Items]
Total included in net income	148,161	114,252
Change in fair value due to credit risk	0	0
Collateralized borrowings in securitization trusts
Fair Value, Option, Quantitative Disclosures [Line Items]
Total included in net income	(105,165)	(89,822)
Change in fair value due to credit risk	0	0
Interest Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Total included in net income	20,313	36,264
Interest Income [Member] | Residential mortgage loans held-for-investment in securitization trusts
Fair Value, Option, Quantitative Disclosures [Line Items]
Total included in net income	102,886	133,993
Interest Expense [Member] | Collateralized borrowings in securitization trusts
Fair Value, Option, Quantitative Disclosures [Line Items]
Total included in net income	(82,573)	(97,729)
Other Income (Loss) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Total included in net income	22,683	(11,834)
Other Income (Loss) [Member] | Residential mortgage loans held-for-investment in securitization trusts
Fair Value, Option, Quantitative Disclosures [Line Items]
Total included in net income	45,275	(19,741)
Other Income (Loss) [Member] | Collateralized borrowings in securitization trusts
Fair Value, Option, Quantitative Disclosures [Line Items]
Total included in net income	$ (22,592)	$ 7,907

Fair Value of Financial Instrum

Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Repurchase agreements	$ 23,133,476	$ 19,451,207
Long-term Federal Home Loan Bank Advances	50,000
Revolving credit facilities	310,000	20,000
Maturity Over One Year [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Revolving credit facilities	290,000	0
Maturity Over One Year [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Repurchase agreements	$ 300,000	$ 112,500

Fair Value by Balance Sheet Gro

Fair Value by Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities, at fair value	$ 25,552,604	$ 21,220,819
Mortgage servicing rights, at fair value	1,993,440	1,086,717	$ 693,815	$ 493,688
Cash and cash equivalents	409,758	419,159
Restricted cash	688,006	635,836
Derivative assets, at fair value	319,981	309,918
Reverse repurchase agreements	761,815	0
Other assets	74,412	116,653
Repurchase agreements	23,133,476	19,451,207
Federal Home Loan Bank advances	865,024	1,215,024
Revolving credit facilities	310,000	20,000
Convertible senior notes	283,856	282,827
Convertible senior notes, at fair value	281,951	306,351
Derivative liabilities, at fair value	820,590	31,903
Federal Home Loan Bank of Des Moines [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Federal Home Loan Bank advances	$ 900,000	$ 1,200,000

Repurchase Agreements (Details)

Repurchase Agreements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Repurchase Agreements [Abstract]
Repurchase agreements	$ 23,133,476	$ 19,451,207
Weighted average borrowing rate	2.68%	1.69%
Weighted average remaining maturity	66 days	83 days

Schedule of Repurchase Agreemen

Schedule of Repurchase Agreements by Term, Short or Long (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	$ 23,133,476	$ 19,451,207
Maturity up to One Year [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	22,833,476	19,338,707
Maturity Over One Year [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	$ 300,000	$ 112,500

Schedule of Repurchase Agreem_2

Schedule of Repurchase Agreements by Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	$ 23,133,476	$ 19,451,207
Weighted average borrowing rate	2.68%	1.69%
US Government Agencies Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	$ 20,091,396	$ 17,325,553
Weighted average borrowing rate	2.52%	1.53%
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	$ 2,695,564	$ 1,941,911
Weighted average borrowing rate	3.65%	2.98%
Inverse Interest-Only Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	$ 46,516	$ 71,243
Weighted average borrowing rate	3.34%	2.15%
Servicing Contracts [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	$ 300,000	$ 112,500
Weighted average borrowing rate	4.51%	3.78%
Maturity up to 30 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	$ 7,488,869	$ 4,269,464
Maturity up to 30 days [Member] | US Government Agencies Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	6,712,021	3,634,541
Maturity up to 30 days [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	770,287	613,500
Maturity up to 30 days [Member] | Inverse Interest-Only Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	6,561	21,423
Maturity up to 30 days [Member] | Servicing Contracts [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	0
Maturity 30 to 59 Days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	5,077,598	3,831,111
Maturity 30 to 59 Days [Member] | US Government Agencies Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	4,557,688	3,522,256
Maturity 30 to 59 Days [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	496,466	261,835
Maturity 30 to 59 Days [Member] | Inverse Interest-Only Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	23,444	47,020
Maturity 30 to 59 Days [Member] | Servicing Contracts [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	0
Maturity 60 to 89 Days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	5,655,061	3,458,940
Maturity 60 to 89 Days [Member] | US Government Agencies Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	5,410,967	3,165,834
Maturity 60 to 89 Days [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	242,473	290,628
Maturity 60 to 89 Days [Member] | Inverse Interest-Only Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	1,621	2,478
Maturity 60 to 89 Days [Member] | Servicing Contracts [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	0
Maturity 90 to 119 Days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	1,938,859	2,452,426
Maturity 90 to 119 Days [Member] | US Government Agencies Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	1,209,395	2,119,490
Maturity 90 to 119 Days [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	722,399	332,614
Maturity 90 to 119 Days [Member] | Inverse Interest-Only Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	7,065	322
Maturity 90 to 119 Days [Member] | Servicing Contracts [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	0
Maturity 120 to 364 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	2,673,089	5,326,766
Maturity 120 to 364 days [Member] | US Government Agencies Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	2,201,325	4,883,432
Maturity 120 to 364 days [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	463,939	443,334
Maturity 120 to 364 days [Member] | Inverse Interest-Only Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	7,825	0
Maturity 120 to 364 days [Member] | Servicing Contracts [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	0
Maturity Over One Year [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	300,000	112,500
Maturity Over One Year [Member] | US Government Agencies Debt Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	0
Maturity Over One Year [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	0
Maturity Over One Year [Member] | Inverse Interest-Only Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	0
Maturity Over One Year [Member] | Servicing Contracts [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	$ 300,000	$ 112,500

Schedule of Underlying Assets o

Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]
Assets pledged or restricted as collateral for repurchase agreements	$ 25,530,229	$ 21,501,250
Available-for-sale Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets pledged or restricted as collateral for repurchase agreements	24,240,507	19,780,175
Servicing Contracts [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets pledged or restricted as collateral for repurchase agreements	685,683	424,740
Cash and Cash Equivalents [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets pledged or restricted as collateral for repurchase agreements	0	15,000
Restricted Cash and Cash Equivalents [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets pledged or restricted as collateral for repurchase agreements	416,696	417,018
Due From Correspondent Brokers [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets pledged or restricted as collateral for repurchase agreements	110,695	773,422
Derivative Financial Instruments, Assets [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets pledged or restricted as collateral for repurchase agreements	70,191	90,895
US Treasury Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets pledged or restricted as collateral for repurchase agreements	$ 6,457	$ 0

Schedule of Repurchase Agreem_3

Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 10 Percent of Stockholders' Equity (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)counterparty	Dec. 31, 2017USD ($)counterparty
Repurchase Agreement Counterparty [Line Items]
Repurchase agreements	$ 23,133,476	$ 19,451,207
Net Counterparty Exposure	$ 2,022,074	$ 1,743,123
Weighted Average Days to Maturity	66 days	83 days
Repurchase Agreement Counterparty, Royal Bank of Canada [Member]
Repurchase Agreement Counterparty [Line Items]
Repurchase agreements	$ 2,504,438	$ 1,261,956
Net Counterparty Exposure	$ 342,739	$ 223,347
Percent of Equity	8.00%	6.00%
Weighted Average Days to Maturity	94 days	75 days
Repurchase Agreement Counterparty, All Other Counterparties [Member]
Repurchase Agreement Counterparty [Line Items]
Repurchase agreements	$ 20,629,038	$ 18,189,251
Net Counterparty Exposure	$ 1,679,335	$ 1,519,776
Percent of Equity	39.00%	43.00%
Weighted Average Days to Maturity	63 days	84 days
Number of repurchase agreement counterparties with whom amount at risk is less than 10 percent of stockholders' equity | counterparty	29	26

Reverse Repurchase Agreements_2

Reverse Repurchase Agreements Reverse Repurchase Agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Reverse repurchase agreements	$ 761,815	$ 0
Short US Treasury Securities [Member]
Derivative [Line Items]
Fair Value	$ (781,500)	$ 0

Federal Home Loan Bank of Des_3

Federal Home Loan Bank of Des Moines Advances (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal Home Loan Bank advances	$ 865,024	$ 1,215,024
Maximum percent of FHLB advances to total assets	40.00%
Federal Home Loan Bank of Des Moines [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal Home Loan Bank advances	$ 900,000	$ 1,200,000
Weighted average borrowing rate	2.79%	1.79%
Available uncommitted capacity for borrowings	$ 2,700,000	$ 2,200,000

Schedule of Maturities of Feder

Schedule of Maturities of Federal Home Loan Bank Advances (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Maturities of Federal Home Loan Bank Advances [Line Items]
Federal Home Loan Bank advances	$ 865,024	$ 1,215,024
Maturity Within One Year [Member]
Schedule of Maturities of Federal Home Loan Bank Advances [Line Items]
Federal Home Loan Bank advances	815,024	0
Maturity One to Three Years [Member]
Schedule of Maturities of Federal Home Loan Bank Advances [Line Items]
Federal Home Loan Bank advances	0	815,024
Maturity Three to Five Years [Member]
Schedule of Maturities of Federal Home Loan Bank Advances [Line Items]
Federal Home Loan Bank advances	0	0
Maturity Five to Ten Years [Member]
Schedule of Maturities of Federal Home Loan Bank Advances [Line Items]
Federal Home Loan Bank advances	0	0
Maturity Over Ten Years [Member]
Schedule of Maturities of Federal Home Loan Bank Advances [Line Items]
Federal Home Loan Bank advances	$ 50,000	$ 400,000

Schedule of Underlying Assets_2

Schedule of Underlying Assets of Federal Home Loan Bank Advances (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]
Assets pledged as collateral for Federal Home Loan Bank advances	$ 917,492	$ 1,273,674
Federal Home Loan Bank of Des Moines [Member]
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]
Federal Home Loan Bank stock	40,800	53,800
Available-for-sale Securities [Member]
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]
Assets pledged as collateral for Federal Home Loan Bank advances	917,492	1,210,715
Due From Correspondent Brokers [Member]
Schedule of Assets Underlying Federal Home Loan Bank Advances [Line Items]
Assets pledged as collateral for Federal Home Loan Bank advances	$ 0	$ 62,959

Revolving Credit Facilities (De

Revolving Credit Facilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Revolving credit facilities	$ 310,000	$ 20,000
Weighted average borrowing rate	5.60%	5.14%
Weighted average remaining maturity	4 years 3 months	11 months 15 days
Mortgage servicing rights, at fair value, pledged as collateral for borrowings	$ 1,100,000	$ 600,000
Short-term Debt [Member]
Short-term Debt [Line Items]
Mortgage servicing rights, at fair value, pledged as collateral for borrowings	$ 458,200	$ 159,500

Schedule of Revolving Credit Fa

Schedule of Revolving Credit Facilities by Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Revolving credit facilities	$ 310,000	$ 20,000
Maturity up to 30 days [Member]
Line of Credit Facility [Line Items]
Revolving credit facilities	0	0
Maturity 30 to 59 Days [Member]
Line of Credit Facility [Line Items]
Revolving credit facilities	0	0
Maturity 60 to 89 Days [Member]
Line of Credit Facility [Line Items]
Revolving credit facilities	0	0
Maturity 90 to 119 Days [Member]
Line of Credit Facility [Line Items]
Revolving credit facilities	0	0
Maturity 120 to 364 days [Member]
Line of Credit Facility [Line Items]
Revolving credit facilities	20,000	20,000
Maturity Over One Year [Member]
Line of Credit Facility [Line Items]
Revolving credit facilities	$ 290,000	$ 0

Convertible Senior Notes (Detai

Convertible Senior Notes (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Debt Instrument, Redemption [Line Items]
Proceeds from convertible senior notes	$ 282,200
Convertible senior notes conversion ratio	0.0624003	0.0614698
Convertible senior notes	$ 283,856	$ 282,827
Convertible Debt [Member]
Debt Instrument, Redemption [Line Items]
Convertible senior notes aggregate principal amount	$ 287,500
Convertible senior notes interest rate per annum	6.25%

Commitments and Contingencies M

Commitments and Contingencies Management Agreement (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Percent per annum of equity used to calculate management fees		1.50%
Percent per annum of additional equity used to calculate management fees		0.75%
One Time Downward Adjustment of Management Fees Payable	$ 15,000
Maximum Additional One Time Downward Adjustment of Management Fees Payable	$ 3,300

Stockholders' Equity Redeemable

Stockholders' Equity Redeemable Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Jul. 31, 2018	Dec. 31, 2018	Dec. 31, 2016	Dec. 31, 2017
Class of Stock [Line Items]
Shares issued and outstanding		40,050,000		29,050,000
Preferred stock carrying value		$ 977,501
Preferred stock liquidation preference per share (in usd per share)		$ 25
Number of shares of stock issued during period (in shares)			30,301
Preferred stock par value per share (in usd per share)		$ 0.01		$ 0.01
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Shares issued and outstanding		5,750,000
Preferred stock carrying value		$ 138,872
Preferred stock dividend rate		8.125%
Preferred stock dividend variable rate spread		5.66%
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Shares issued and outstanding		11,500,000
Preferred stock carrying value		$ 278,094
Preferred stock dividend rate		7.625%
Preferred stock dividend variable rate spread		5.352%
Series C Preferred Stock [Member]
Class of Stock [Line Items]
Shares issued and outstanding		11,800,000
Preferred stock carrying value		$ 285,584
Preferred stock dividend rate		7.25%
Preferred stock dividend variable rate spread		5.011%
Series D Preferred Stock [Member]
Class of Stock [Line Items]
Shares issued and outstanding		3,000,000
Preferred stock carrying value		$ 74,964
Preferred stock dividend rate		7.75%
Number of shares of stock issued during period (in shares)	3,000,000
Preferred stock par value per share (in usd per share)		$ 0.01
Series E Preferred Stock [Member]
Class of Stock [Line Items]
Shares issued and outstanding		8,000,000
Preferred stock carrying value		$ 199,987
Preferred stock dividend rate		7.50%
Number of shares of stock issued during period (in shares)	8,000,000
Preferred stock par value per share (in usd per share)		$ 0.01

Stockholders' Equity Schedule o

Stockholders' Equity Schedule of Preferred Dividends Declared (Details) - $ / shares	3 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Declaration Date	Dec. 18, 2018	Sep. 20, 2018	Jun. 19, 2018	Mar. 20, 2018	Dec. 14, 2017	Sep. 14, 2017	Jun. 15, 2017
Record Date	Dec. 31, 2018	Oct. 12, 2018	Jul. 12, 2018	Apr. 12, 2018	Jan. 12, 2018	Oct. 12, 2017	Jul. 12, 2017
Payment Date	Jan. 28, 2019	Oct. 29, 2018	Jul. 27, 2018	Apr. 27, 2018	Jan. 29, 2018	Oct. 27, 2017	Jul. 27, 2017
Dividends declared per preferred share (in usd per share)	$ 0.507810	$ 0.507810	$ 0.507810	$ 0.507810	$ 0.507810	$ 0.507810	$ 0.750430
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Declaration Date	Dec. 18, 2018	Sep. 20, 2018	Jun. 19, 2018	Mar. 20, 2018	Dec. 14, 2017	Sep. 14, 2017
Record Date	Dec. 31, 2018	Oct. 12, 2018	Jul. 12, 2018	Apr. 12, 2018	Jan. 12, 2018	Oct. 12, 2017
Payment Date	Jan. 28, 2019	Oct. 29, 2018	Jul. 27, 2018	Apr. 27, 2018	Jan. 29, 2018	Oct. 27, 2017
Dividends declared per preferred share (in usd per share)	$ 0.476560	$ 0.476560	$ 0.476560	$ 0.476560	$ 0.476560	$ 0.518920
Series C Preferred Stock [Member]
Class of Stock [Line Items]
Declaration Date	Dec. 18, 2018	Sep. 20, 2018	Jun. 19, 2018	Mar. 20, 2018	Dec. 14, 2017
Record Date	Dec. 31, 2018	Oct. 12, 2018	Jul. 12, 2018	Apr. 12, 2018	Jan. 12, 2018
Payment Date	Jan. 28, 2019	Oct. 29, 2018	Jul. 27, 2018	Apr. 27, 2018	Jan. 29, 2018
Dividends declared per preferred share (in usd per share)	$ 0.453130	$ 0.453130	$ 0.453130	$ 0.453130	$ 0.302080
Series D Preferred Stock [Member]
Class of Stock [Line Items]
Declaration Date	Dec. 18, 2018	Sep. 20, 2018
Record Date	Dec. 31, 2018	Oct. 1, 2018
Payment Date	Jan. 28, 2019	Oct. 15, 2018
Dividends declared per preferred share (in usd per share)	$ 0.484375	$ 0.484375
Series E Preferred Stock [Member]
Class of Stock [Line Items]
Declaration Date	Dec. 18, 2018	Sep. 20, 2018
Record Date	Dec. 31, 2018	Oct. 1, 2018
Payment Date	Jan. 28, 2019	Oct. 15, 2018
Dividends declared per preferred share (in usd per share)	$ 0.468750	$ 0.468750

Stockholders' Equity Issuance o

Stockholders' Equity Issuance of Common Stock in Connection with Acquisition of CYS Investments, Inc. (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jul. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Number of shares of stock issued during period (in shares)				30,301
Aggregate cash consideration exchanged for shares of CYS common stock	$ 14,967
Common Stock [Member]
Class of Stock [Line Items]
Number of shares of stock issued during period (in shares)	72,587,772	72,616,483	26,950

Stockholders' Equity Common Sto

Stockholders' Equity Common Stock Rollforward (Details) $ in Thousands	Nov. 01, 2017shares	Jul. 31, 2018USD ($)shares	Dec. 31, 2018shares	Dec. 31, 2017shares	Dec. 31, 2016shares	Oct. 31, 2017shares
Increase (Decrease) in Common Stock Outstanding [Roll Forward]
Common shares outstanding at beginning of period (in shares)			174,496,587	173,826,163	176,953,403
Number of shares of stock issued during period (in shares)					30,301
Number of shares of restricted common stock issued during period (in shares)					852,459
Number of shares of stock repurchased during period (in shares)					(4,010,000)
Common shares outstanding at end of period (in shares)			248,085,721	174,496,587	173,826,163
Reverse stock split, conversion ratio	0.50
Common shares authorized (in shares)	450,000,000		450,000,000	450,000,000		900,000,000
Aggregate cash consideration exchanged for shares of CYS common stock | $		$ 14,967
Number of nonvested restricted common shares outstanding (in shares)			1,593,701	1,284,010	1,319,712
Common Stock [Member]
Increase (Decrease) in Common Stock Outstanding [Roll Forward]
Common shares outstanding at beginning of period (in shares)			174,496,587
Number of shares of stock issued during period (in shares)		72,587,772	72,616,483	26,950
Number of shares of restricted common stock issued during period (in shares)			972,651	643,474
Common shares outstanding at end of period (in shares)			248,085,721	174,496,587

Stockholders' Equity Schedule_2

Stockholders' Equity Schedule of Common Dividends Declared (Details) - $ / shares

Nov. 01, 2017

Jul. 31, 2018

Sep. 30, 2018

Sep. 30, 2018

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2016

Sep. 30, 2016

Jun. 30, 2016

Mar. 31, 2016

Class of Stock [Line Items]

Number of shares of common stock of Granite Point Mortgage Trust Inc distributed via special dividend (in shares)

33,100,000

Common Stock [Member]

Class of Stock [Line Items]

Declaration Date

Jul. 13, 2018

Dec. 18, 2018

Sep. 20, 2018

Jun. 19, 2018

Mar. 20, 2018

Dec. 14, 2017

Sep. 14, 2017

Jun. 15, 2017

Mar. 14, 2017

Dec. 15, 2016

Sep. 15, 2016

Jun. 16, 2016

Mar. 15, 2016

Record Date

Jul. 25, 2018

Dec. 31, 2018

Oct. 1, 2018

Jun. 29, 2018

Apr. 2, 2018

Dec. 26, 2017

Sep. 29, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 30, 2016

Sep. 30, 2016

Jun. 30, 2016

Mar. 31, 2016

Payment Date

Jul. 30, 2018

Jan. 28, 2019

Oct. 29, 2018

Jul. 27, 2018

Apr. 27, 2018

Dec. 29, 2017

Oct. 27, 2017

Jul. 27, 2017

Apr. 27, 2017

Jan. 27, 2017

Oct. 20, 2016

Jul. 20, 2016

Apr. 21, 2016

Dividends declared per common share (in usd per share)

$ 0.158370

$ 0.470000

$ 0.311630

$ 0.470000

$ 0.470000

$ 0.470000

$ 0.520000

$ 0.520000

$ 0.500000

$ 0.480000

$ 0.460000

$ 0.460000

$ 0.460000

Stockholders' Equity Dividend R

Stockholders' Equity Dividend Reinvestment and Direct Stock Purchase Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Number of common shares reserved for issuance under dividend reinvestment plan (in shares)	3,750,000
Number of common shares issued from dividend reinvestment plan and outstanding as of period-end (in shares)	227,852
Accumulated proceeds from issuance of common shares from dividend reinvestment plan	$ 4,400
Number of common shares issued during period from dividend reinvestment plan (in shares)	28,711	27,194	30,301
Proceeds from issuance of common shares during period from dividend reinvestment plan	$ 400	$ 500	$ 500

Stockholders' Equity Share Repu

Stockholders' Equity Share Repurchase Program (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Number of shares authorized to be repurchased under stock repurchase program (in shares)	37,500,000
Number of shares repurchased and retired to date (in shares)	12,067,500
Cost of shares repurchased and retired to date	$ 200,400
Repurchase of common stock (in shares)	0	0	4,010,000
Repurchase of common stock	$ 0	$ 0	$ 61,307

Stockholders' Equity At-the-Mar

Stockholders' Equity At-the-Market Offering (Details) - USD ($) $ in Thousands	Feb. 08, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Number of shares authorized to be sold under equity distribution agreement (in shares)		10,000,000
Number of common shares issued under equity distribution agreement and outstanding as of period-end (in shares)		3,792,935
Accumulated proceeds from issuance of common shares under equity distribution agreement		$ 77,600
Subsequent Event [Member]
Subsequent Event [Line Items]
Number of shares authorized to be sold under equity distribution agreement (in shares)	35,000,000

Stockholders' Equity Schedule_3

Stockholders' Equity Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Unrealized gains	$ 498,744	$ 475,694
Unrealized losses	(387,927)	(140,881)
Accumulated other comprehensive (loss) income	$ 110,817	$ 334,813

Stockholders' Equity Reclassifi

Stockholders' Equity Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Realized losses (gains) on sales of certain AFS securities, net of tax	$ 341,312	$ 34,695	$ 107,374
Amounts reclassified from accumulated other comprehensive income (loss)	(254,339)	5,996	(101,030)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other-than-temporary impairments on AFS securities	470	789	1,822
Realized losses (gains) on sales of certain AFS securities, net of tax	$ 253,869	$ 5,207	$ (102,852)

Equity Incentive Plan (Details)

Equity Incentive Plan (Details)	Nov. 01, 2017	Dec. 31, 2018$ / sharesshares	Dec. 31, 2017$ / sharesshares	Dec. 31, 2016$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted common shares reserved for issuance under equity incentive plan (in shares)		6,500,000
Reverse stock split, conversion ratio	0.50
Number of restricted common shares granted during period under equity incentive plan (in shares)		996,924	671,845
Weighted average grant date fair value of restricted common shares granted during period under equity incentive plan (in usd per share) | $ / shares		$ 14.96	$ 17.60
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted common shares granted during period under equity incentive plan (in shares)		55,553	34,559	40,869
Weighted average grant date fair value of restricted common shares granted during period under equity incentive plan (in usd per share) | $ / shares		$ 15.48	$ 19.82	$ 16.86
Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted common shares granted during period under equity incentive plan (in shares)		941,371	637,286	968,761
Weighted average grant date fair value of restricted common shares granted during period under equity incentive plan (in usd per share) | $ / shares		$ 15.12	$ 17.48	$ 15.04
Award vesting period of restricted common shares granted during period under equity incentive plan		3 years

Equity Incentive Plan Schedule

Equity Incentive Plan Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of nonvested restricted common shares outstanding at beginning of period (in shares)	1,284,010	1,319,712
Weighted average grant date fair value of nonvested restricted common shares outstanding at beginning of period (in usd per share)	$ 17.15	$ 17.10
Number of restricted common shares granted during period under equity incentive plan (in shares)	996,924	671,845
Weighted average grant date fair value of restricted common shares granted during period under equity incentive plan (in usd per share)	$ 14.96	$ 17.60
Number of restricted common shares vested during period (in shares)	(673,118)	(684,727)
Weighted average grant date fair value of restricted common shares vested during period (in usd per share)	$ (17.12)	$ (17.47)
Number of restricted common shares forfeited during period (in shares)	(14,115)	(22,820)
Weighted average grant date fair value of restricted common shares forfeited during period (in usd per share)	$ (15.59)	$ (17.90)
Number of nonvested restricted common shares outstanding at end of period (in shares)	1,593,701	1,284,010	1,319,712
Weighted average grant date fair value of nonvested restricted common shares outstanding at end of period (in usd per share)	$ 15.81	$ 17.15	$ 17.10
Compensation costs related to restricted common stock	$ 13	$ 11.3	$ 15.2

Income Taxes (Details)

Income Taxes (Details)	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Percent of REIT taxable income the entity intends to distribute	100.00%

Components of Income Tax Expens

Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Current Federal Tax Expense (Benefit)									$ 52	$ 492	$ (1,616)
Current state tax provision (benefit)									1	57	164
Total current tax provision (benefit)									53	549	(1,452)
Deferred tax (benefit) provision									41,770	(11,031)	13,766
Provision for (benefit from) income taxes	$ 6,681	$ 37,409	$ (6,051)	$ 3,784	$ 10,618	$ (5,342)	$ 8,759	$ (24,517)	$ 41,823	$ (10,482)	$ 12,314
Federal income tax rate applicable to corporations									21.00%	35.00%	35.00%

Effective Income Tax Rate Recon

Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Computed income tax expense at federal rate									$ (518)	$ 104,215	$ 127,957
Federal income tax rate applicable to corporations									21.00%	35.00%	35.00%
State taxes, net of federal benefit, if applicable									$ 1	$ 37	$ 106
State taxes, net of federal benefit, if applicable, effective tax rate									0.00%	0.00%	0.00%
Permanent differences in taxable income from GAAP net income									$ 28,414	$ 1,208	$ 401
Permanent differences in taxable income from GAAP net income, effective tax rate									(1152.00%)	0.00%	0.00%
Dividends paid deduction									$ 13,926	$ (115,942)	$ (116,150)
Dividends paid deduction, effective tax rate									(565.00%)	(39.00%)	(32.00%)
Provision for (benefit from) income taxes	$ 6,681	$ 37,409	$ (6,051)	$ 3,784	$ 10,618	$ (5,342)	$ 8,759	$ (24,517)	$ 41,823	$ (10,482)	$ 12,314
Provision for (benefit from) income taxes, effective tax rate									(1696.00%)	(4.00%)	3.00%
Tax provision related to permanent differences in taxable income from GAAP net income									$ 17,800	$ 17,500

Current and Deferred Tax Assets

Current and Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal income taxes receivable	$ 690	$ 130
State and local income taxes receivable	0	0
Income taxes receivable, net	690	130
Deferred tax asset	17,196	50,419
Deferred tax liability	(18,333)	(24,463)
Total net deferred tax liabilities	(1,137)
Total net deferred tax assets		25,956
Total tax liabilities, net	$ (447)
Total tax assets, net		$ 26,086

Income Taxes Components of Defe

Income Taxes Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Deferred tax assets, available-for-sale securities	$ 19
Deferred tax liabilities, available-for-sale securities		$ (11,917)
Deferred tax liabilities, mortgage servicing rights	(18,333)	(9,054)
Deferred tax assets, derivative assets and liabilities	33	4,870
Deferred tax assets, other assets	9	139
Deferred tax assets, other liabilities	652	545
Deferred tax assets, intangibles	101	108
Deferred tax assets, alternative minimum tax credit	0	2,386
Deferred tax assets, net operating loss carryforward	16,354	21,853
Deferred tax assets, capital loss carryforward	28	19,766
Total deferred tax liabilities	(1,137)
Total deferred tax assets		28,696
Valuation allowance on deferred tax assets	0	(2,740)
Total net deferred tax liabilities	(1,137)
Total net deferred tax assets		$ 25,956
Tax Year 2015 [Member]
Operating Loss Carryforwards [Line Items]
Deferred tax assets, net operating loss carryforward	2,400
Tax Year 2016 [Member]
Operating Loss Carryforwards [Line Items]
Deferred tax assets, net operating loss carryforward	12,300
Tax Year 2017 [Member]
Operating Loss Carryforwards [Line Items]
Deferred tax assets, net operating loss carryforward	$ 1,700

Earnings Per Share (Details)

Earnings Per Share (Details) $ / shares in Units, $ in Thousands	Nov. 01, 2017	Dec. 31, 2018USD ($)$ / shares	Sep. 30, 2018USD ($)$ / shares	Jun. 30, 2018USD ($)$ / shares	Mar. 31, 2018USD ($)$ / shares	Dec. 31, 2017USD ($)$ / shares	Sep. 30, 2017USD ($)$ / shares	Jun. 30, 2017USD ($)$ / shares	Mar. 31, 2017USD ($)$ / shares	Dec. 31, 2018USD ($)$ / sharesshares	Dec. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2016USD ($)$ / sharesshares
Earnings Per Share [Abstract]
Reverse stock split, conversion ratio	0.50
Net (loss) income from continuing operations										$ (44,290)	$ 308,239	$ 317,921
Income from discontinued operations, net of tax						$ 3,877	$ 8,844	$ 14,157	$ 13,454	0	44,146	35,357
Net (loss) income										(44,290)	352,385	353,278
Income from discontinued operations attributable to noncontrolling interest										0	3,814	0
Net income attributable to Two Harbors Investment Corp.										(44,290)	348,571	353,278
Dividends on preferred stock		$ 18,950	$ 18,951	$ 13,747	$ 13,747	11,949	8,888	4,285	0	65,395	25,122	0
Net income attributable to common stockholders		$ (573,485)	$ 16,995	$ 125,743	$ 321,062	$ 153,955	$ 93,176	$ 4,333	$ 71,985	(109,685)	323,449	353,278
Interest expense attributable to convertible notes										0	17,867	0
Net (loss) income attributable to common stockholders - diluted										$ (109,685)	$ 341,316	$ 353,278
Weighted average common shares outstanding (in shares) | shares										204,409,853	173,063,178	172,523,497
Weighted average restricted stock shares (in shares) | shares										1,610,649	1,370,821	1,513,355
Weighted average basic common shares outstanding (in shares) | shares										206,020,502	174,433,999	174,036,852
Effect of dilutive shares issued in an assumed conversion (in shares) | shares										0	13,699,342	0
Weighted average diluted common shares outstanding (in shares) | shares										206,020,502	188,133,341	174,036,852
Basic earnings per weighted average common share (in usd per share) | $ / shares		$ (2.31)	$ 0.08	$ 0.72	$ 1.83	$ 0.88	$ 0.53	$ 0.02	$ 0.41	$ (0.53)	$ 1.85	$ 2.03
Diluted earnings per weighted average common share (in usd per share) | $ / shares		$ (2.31)	$ 0.08	$ 0.68	$ 1.69	$ 0.84	$ 0.52	$ 0.02	$ 0.41	$ (0.53)	$ 1.81	$ 2.03

Schedule of Related Party Trans

Schedule of Related Party Transactions, by Related Party (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Management fees		$ 30,272	$ 40,472	$ 39,261
Percent per annum of equity used to calculate management fees		1.50%
Percent per annum of additional equity used to calculate management fees		0.75%
One Time Downward Adjustment of Management Fees Payable	$ 15,000
Maximum Additional One Time Downward Adjustment of Management Fees Payable	$ 3,300
Compensation costs related to restricted common stock		$ 13,000	11,300	15,200
PRCM Advisers LLC [Member]
Related Party Transaction [Line Items]
Management fees		$ 47,800	40,500	39,300
Percent per annum of equity used to calculate management fees		1.50%
Total One Time Downward Adjustment of Management Fees Payable		$ 17,500
Direct and allocated costs incurred by manager		$ 26,300	27,900	$ 28,400
Granite Point Mortgage Trust Inc. [Member]
Related Party Transaction [Line Items]
Purchases of equity securities of related party (in shares)		1,658,008
Purchases of equity securities of related party		$ 30,000
Equity securities, at fair value			29,400
Equity securities, unrealized gain (loss)			$ (600)
Proceeds from sales of equity securities of related party		31,200
Realized gain on sales of equity securities of related party		$ 1,200

Subsequent Events Subsequent Ev

Subsequent Events Subsequent Events (Details)	Nov. 01, 2017	Mar. 31, 2019	Feb. 08, 2019shares	Dec. 31, 2018shares
Subsequent Event [Line Items]
Number of shares authorized to be sold under equity distribution agreement (in shares)				10,000,000
Number of common shares issued under equity distribution agreement and outstanding as of period-end (in shares)				3,792,935
Reverse stock split, conversion ratio	0.50
Subsequent Event [Member]
Subsequent Event [Line Items]
Number of shares authorized to be sold under equity distribution agreement (in shares)			35,000,000
Percentage of gross proceeds compensated to sales agent		2.00%

Quarterly Financial Data (Detai

Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Total interest income	$ 251,955	$ 236,698	$ 187,360	$ 194,019	$ 195,105	$ 196,089	$ 184,741	$ 169,154	$ 870,032	$ 745,089	$ 575,080
Total interest expense	162,301	152,396	108,414	96,560	94,795	99,427	85,281	70,685	519,671	350,188	213,284
Net interest income	89,654	84,302	78,946	97,459	100,310	96,662	99,460	98,469	350,361	394,901	361,796
Other-than-temporary impairment losses	(107)	(95)	(174)	(94)	(360)	0	(429)	0	(470)	(789)	(1,822)
Total other income	(590,696)	112,514	93,174	281,982	103,288	23,060	(57,197)	(35,585)	(103,026)	33,566	107,388
Total expenses	46,705	123,366	38,507	40,754	30,593	31,844	38,614	28,870	249,332	129,921	137,127
Provision for (benefit from) income taxes	6,681	37,409	(6,051)	3,784	10,618	(5,342)	8,759	(24,517)	41,823	(10,482)	12,314
Income from discontinued operations, net of tax					3,877	8,844	14,157	13,454	0	44,146	35,357
Dividends on preferred stock	18,950	18,951	13,747	13,747	11,949	8,888	4,285	0	65,395	25,122	0
Net income attributable to common stockholders	$ (573,485)	$ 16,995	$ 125,743	$ 321,062	$ 153,955	$ 93,176	$ 4,333	$ 71,985	$ (109,685)	$ 323,449	$ 353,278
Basic earnings per weighted average common share:
Basic earnings from continuing operations per weighted average common share (in usd per share)	$ (2.31)	$ 0.08	$ 0.72	$ 1.83	$ 0.86	$ 0.48	$ (0.06)	$ 0.33	$ (0.53)	$ 1.62	$ 1.83
Basic earnings from discontinued operations per weighted average common share (in usd per share)					0.02	0.05	0.08	0.08	0	0.23	0.20
Basic earnings per weighted average common share (in usd per share)	(2.31)	0.08	0.72	1.83	0.88	0.53	0.02	0.41	(0.53)	1.85	2.03
Diluted earnings per weighted average common share:
Diluted earnings from continuing operations per weighted average common share (in usd per share)	(2.31)	0.08	0.68	1.69	0.82	0.47	(0.06)	0.33	(0.53)	1.60	1.83
Diluted earnings from discontinued operations per weighted average common share (in usd per share)					0.02	0.05	0.08	0.08	0	0.21	0.20
Diluted earnings per weighted average common share (in usd per share)	$ (2.31)	$ 0.08	$ 0.68	$ 1.69	$ 0.84	$ 0.52	$ 0.02	$ 0.41	$ (0.53)	$ 1.81	$ 2.03

Uncategorized Items - two123120

Label	Element	Value
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations	us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations	$ 56,338,000