SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
SIGNIFICANT ACCOUNTING POLICIES (Policies)	Dec. 31, 2014
Principles of Consolidation	Principles of Consolidation – The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The Company has evaluated all of its investments in legal entities in order to determine if they are variable interests in Variable Interest Entities ("VIEs"). A VIE is defined as an entity in which equity investors (i) do not have the characteristics of a controlling financial interest, and/or (ii) do not have sufficient equity at risk for the entity to finance its activities without additional subordinated financial support from other parties. A variable interest is an investment or other interest that will absorb portions of a VIE's expected losses or receive portions of the entity’s expected residual returns. A VIE is required to be consolidated by its primary beneficiary, which is defined as the party that (i) has the power to control the activities that most significantly impact the VIE’s economic performance and (ii) has the obligation to absorb losses of the VIE that could potentially be significant to the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. To assess whether the Company has the power to direct the activities of a VIE that most significantly impact the VIE’s economic performance, the Company considers all facts and circumstances, including the Company’s role in establishing the VIE and the Company’s ongoing rights and responsibilities. This assessment includes first, identifying the activities that most significantly impact the VIE’s economic performance; and second, identifying which party, if any, has power over those activities. In general, the parties that make the most significant decisions affecting the VIE or have the right to unilaterally remove those decision makers are deemed to have the power to direct the activities of a VIE. To assess whether the Company has the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE, the Company considers all of its economic interests, including debt and equity investments and other arrangements deemed to be variable interests in the VIE. This assessment requires that the Company applies judgment in determining whether these interests, in the aggregate, are considered potentially significant to the VIE. Factors considered in assessing significance include: the design of the VIE, including its capitalization structure; subordination of interests; payment priority; relative share of interests held across various classes within the VIE’s capital structure; and the reasons why the interests are held by the Company. The Company performs ongoing reassessments of whether changes in the facts and circumstances regarding the Company’s involvement with a VIE causes the Company’s consolidation conclusion regarding the VIE to change.
Cash and Cash Equivalents	Cash and Cash Equivalents – Cash and cash equivalents include cash on hand and cash held in money market funds on an overnight basis. RCap is a member of various clearing organizations with which it maintains cash required to conduct its day-to-day clearance activities. Cash and securities deposited with clearing organizations are carried at cost, which approximates fair value. The Company also maintains collateral in the form of cash on margin with counterparties to its interest rate swaps and other derivatives. Cash and securities deposited with clearing organizations and collateral held in the form of cash on margin with counterparties to its interest rate swaps and other derivatives totaled approximately $1.6 billion and $371.8 million at December 31, 2014 and December 31, 2013, respectively.
Fair Value Measurements	Fair Value Measurements – The Company reports various financial instruments at fair value. A complete discussion of the methodology utilized by the Company to estimate the fair value of certain financial instruments is included in these Notes to Consolidated Financial Statements.
Revenue Recognition	Revenue Recognition – The revenue recognition policy by asset class is discussed below. Agency Mortgage-Backed Securities and Agency Debentures – The Company invests primarily in mortgage pass-through certificates, collateralized mortgage obligations and other mortgage-backed securities representing interests in or obligations backed by pools of mortgage loans and certificates guaranteed by the Government National Mortgage Association (“Ginnie Mae”), the Federal Home Loan Mortgage Corporation (“Freddie Mac”) or the Federal National Mortgage Association (“Fannie Mae”) (collectively, “Agency mortgage-backed securities”). These Agency mortgage-backed securities may include forward contracts for Agency mortgage-backed securities purchases or sales of a generic pool, on a to-be-announced basis (“TBA securities”). The Company also invests in Agency debentures issued by the Federal Home Loan Banks, Freddie Mac and Fannie Mae. Agency mortgage-backed securities and Agency debentures are referred to herein as “Investment Securities.” 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. Investment Securities are classified as available-for-sale and are reported at fair values estimated by management that are compared to independent sources for reasonableness, with unrealized gains and losses reported as a component of other comprehensive income (loss). Investment Securities transactions are recorded on trade date, including TBA securities that meet the regular-way securities scope exception from derivative accounting. Realized gains and losses on sales of Investment Securities are determined using the average cost method. The Company elected the fair value option for Agency interest-only mortgage-backed securities. Interest-only securities and inverse interest-only securities are collectively referred to as “interest-only securities.” These Agency interest-only mortgage-backed securities represent the Company’s right to receive a specified proportion of the contractual interest flows of specific Agency mortgage-backed securities. Agency interest-only mortgage-backed securities are measured at fair value with changes in fair value recorded as Net unrealized gains (losses) on interest-only Agency mortgage-backed securities in the Company’s Consolidated Statements of Comprehensive Income (Loss). The interest-only securities are included in Agency mortgage-backed securities at fair value on the accompanying Consolidated Statements of Financial Condition. Interest income from coupon payments is accrued based on the outstanding principal amounts of the Investment Securities and their contractual terms. Premiums and discounts associated with the purchase of the Investment Securities are amortized or accreted into interest income over the projected lives of the securities using the interest method. The Company uses a third-party supplied model to project prepayment speeds. The Company’s prepayment speed projections incorporate underlying loan characteristics (e.g., coupon, term, original loan size, original loan to value, etc.) and market data, including interest rate and home price index forecasts. Adjustments are made for actual prepayment activity.
Corporate Debt	Corporate Debt – The Company’s investments in corporate debt are designated as held for investment, and are carried at their principal balance outstanding plus any premiums or discounts less allowances for loan losses. No allowance for loan losses was deemed necessary as of December 31, 2014 and December 31, 2013.
Equity Securities	Equity Securities – The Company may invest in equity securities that are classified as available-for-sale or trading. Equity securities classified as available-for-sale are reported at fair value, based on market quotes, with unrealized gains and losses reported as a component of other comprehensive income (loss). Equity securities classified as trading are reported at fair value, based on market quotes, with unrealized gains and losses reported in the Consolidated Statements of Comprehensive Income (Loss) as Net gains (losses) on trading assets. Dividends are recorded in earnings based on the declaration date.
Derivative Instruments	Derivative Instruments – The Company may use a variety of derivative instruments to economically hedge some of its exposure to market risks, including interest rate and prepayment risk. These instruments include, but are not limited to, interest rate swaps, options to enter into interest rate swaps (“swaptions”), TBA securities with the intent to net settle (“TBA derivatives”), options on TBA securities (“MBS options”) and U.S. Treasury and Eurodollar futures contracts. The Company may also invest in other types of mortgage derivatives such as interest-only securities and synthetic total return swaps, such as the Markit IOS Synthetic Total Return Swap Index. Derivatives are accounted for in accordance with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 815, Derivatives and Hedging, which requires recognition of all derivatives as either assets or liabilities at fair value in the Consolidated Statements of Financial Condition with changes in fair value recognized in the Consolidated Statements of Comprehensive Income (Loss). None of the Company’s derivative transactions have been designated as hedging instruments for accounting purposes. Some derivative agreements contain provisions that allow for netting or setting off by counterparty; however, the Company elected to present related assets and liabilities on a gross basis in the Consolidated Statements of Financial Condition. Interest rate swap agreements - Interest rate swaps are the primary instrument used to mitigate interest rate risk. In particular, the Company uses interest rate swaps to manage its exposure to changing interest rates on its repurchase agreements by economically hedging cash flows associated with these borrowings. Swap agreements may or may not be cleared through a derivatives clearing organization (“DCO”). Uncleared swaps are fair valued using internal pricing models and compared to the counterparty market values. Centrally cleared swaps are fair valued using internal pricing models and compared to the DCO’s market values. Interest rate swaptions - Interest rate swaptions are purchased/sold to mitigate the potential impact of increases or decreases in interest rates. Interest rate swaptions provide the option to enter into an interest rate swap agreement for a predetermined notional amount, stated term and pay and receive interest rates in the future. They are not centrally cleared. The premium paid/received for interest rate swaptions is reported as an asset/liability in the Consolidated Statement of Financial Condition. The difference between the premium and the fair value of the swaption is reported in Net gains (losses) on trading assets in the Consolidated Statements of Comprehensive Income (Loss). If a swaption expires unexercised, the realized gain (loss) on the swaption would be equal to the premium received/paid. If the Company sells or exercises a swaption, the realized gain or loss on the swaption would be equal to the difference between the cash received or the fair value of the underlying interest rate swap received and the premium paid. The fair value of interest rate swaptions is estimated using internal pricing models and compared to the counterparty market value. TBA Dollar Rolls - TBA dollar roll transactions are accounted for as a series of derivative transactions. The fair value of TBA derivatives is based on similar methods used to value Agency mortgage-backed securities with gains and losses recorded in Net gains (losses) on trading assets in the Consolidated Statements of Comprehensive Income (Loss). MBS Options – MBS options are generally options on TBA contracts, which help manage mortgage market risks and volatility while providing the potential to enhance returns. MBS options are over-the-counter traded instruments and those written on current-coupon mortgage-backed securities are typically the most liquid. MBS options are fair valued using internal pricing models and compared to the counterparty market value at the valuation date with gains and losses recorded in Net gains (losses) on trading assets in the Consolidated Statements of Comprehensive Income (Loss). Futures Contracts - Futures contracts are derivatives that track the prices of specific assets. Short sales of futures contracts help mitigate the potential impact of changes in interest rates on the portfolio performance. The Company maintains margin accounts which are settled daily with Futures Commission Merchants (“FCMs”). The margin requirement varies based on the market value of the open positions and the equity retained in the account. Futures contracts are fair valued based on exchange pricing with gains and losses recorded in Net gains (losses) on trading assets in the Consolidated Statements of Comprehensive Income (Loss).
Other-Than-Temporary Impairment	Other-Than-Temporary Impairment – Management evaluates available-for-sale securities for other-than-temporary impairment at least quarterly, and more frequently when economic or market conditions warrant such evaluation. When the fair value of an available-for-sale security is less than its amortized cost the security is considered impaired. For securities that are impaired, the Company determines if it (1) has the intent to sell the security, (2) is more likely than not that it will be required to sell the security before recovery of its amortized cost basis, or (3) does not expect to recover the entire amortized cost basis of the security. Further, the security is analyzed for credit loss (the difference between the present value of cash flows expected to be collected and the amortized cost basis). The credit loss, if any, will then be recognized in the Consolidated Statements of Comprehensive Income (Loss), while the balance of losses related to other factors will be recognized as a component of other comprehensive income (loss). There was no other-than-temporary impairment recognized for the years ended December 31, 2014, 2013 and 2012.
Loan Loss Reserves	Loan Loss Reserves – To determine if loan loss allowances are required on investments in corporate debt, the Company reviews the monthly and/or quarterly financial statements of the borrowers to verify they meet the covenants of the loan documents. If based on the financial review it is deemed probable that the Company will be unable to collect contractual principal and interest amounts (e.g. financial performance and delinquencies), a loan loss provision would be recorded. No allowance for loan losses was deemed necessary as of December 31, 2014 and 2013.
Repurchase Agreements	Repurchase Agreements – The Company finances the acquisition of a significant portion of its Agency mortgage-backed securities with repurchase agreements. The Company examines each of the specified criteria in ASC 860, Transfers and Servicing, at the inception of each transaction and has determined that each of the financings meet the specified criteria in this guidance. None of the Company’s repurchase agreements are accounted for as components of linked transactions. As a result, the Company separately accounts for the financial assets and related repurchase financings in the accompanying consolidated financial statements. Reverse repurchase agreements and repurchase agreements with the same counterparty and the same maturity are presented net in the Consolidated Statements of Financial Condition when the terms of the agreements meet the criteria to permit netting. The Company reports cash flows on repurchase agreements as financing activities in the Consolidated Statements of Cash Flows. The Company reports cash flows on reverse repurchase and repurchase agreements entered into by RCap and Shannon as operating activities in the Consolidated Statements of Cash Flows.
Goodwill and Intangible Assets	Goodwill and Intangible Assets – The Company’s acquisitions of FIDAC, Merganser Capital Management, Inc. (“Merganser”) and CreXus were accounted for using the acquisition method. In October 2013, the Company sold the operations of Merganser. Under the acquisition method, net assets and results of operations of acquired companies are included in the consolidated financial statements from the date of acquisition. The purchase prices of FIDAC, Merganser and CreXus were allocated to the assets acquired, including identifiable intangible assets, and the liabilities assumed based on their estimated fair values at the date of acquisition. The excess of purchase price over the fair value of the net assets acquired was recognized as goodwill. The Company tests goodwill for impairment on an annual basis and at interim periods when events or circumstances may make it more likely than not that an impairment has occurred. If a qualitative analysis indicates that there may be an impairment, a quantitative analysis is performed. The quantitative impairment test for goodwill utilizes a two-step approach, whereby the Company compares the carrying value of each identified reporting unit to its fair value. If the carrying value of the reporting unit is greater than its fair value, the second step is performed, where the implied fair value of goodwill is compared to its carrying value. The Company recognizes an impairment charge for the amount by which the carrying amount of goodwill exceeds its fair value. Intangible assets with an estimated useful life are amortized over their expected useful lives.
Convertible Senior Notes	Convertible Senior Notes – The Company records the 4% Convertible Senior Notes and 5% Convertible Senior Notes (collectively, the “Convertible Senior Notes”) at their contractual amounts, adjusted by the effects of a beneficial conversion feature and a contingent beneficial conversion feature (collectively, the “Conversion Features”). The Conversion Features’ intrinsic value is included in “Additional paid-in capital” on the Company’s Consolidated Statements of Financial Condition and reduces the recorded liability amount associated with the Convertible Senior Notes. A Conversion Feature may be recognized as a result of adjustments to the conversion price for dividends declared to common stockholders.
Stock Based Compensation	Stock Based Compensation – The Company is required to measure and recognize in the consolidated financial statements the compensation cost relating to share-based payment transactions. The Company recognizes compensation expense on a straight-line basis over the requisite service period for the entire award.
Income Taxes	Income Taxes – The Company has elected to be taxed as a REIT and intends to comply with the provisions of the Code, with respect thereto. Accordingly, the Company will not be subject to federal income tax to the extent of its distributions to stockholders and as long as certain asset, income and stock ownership tests are met. The Company and certain of its direct and indirect subsidiaries, including FIDAC, RCap and certain subsidiaries of ACREG, have made separate joint elections to treat these subsidiaries as taxable REIT subsidiaries (“TRSs”). As such, each of these TRSs is taxable as a domestic C corporation and subject to federal, state and local income taxes based upon their taxable income. The provisions of ASC 740, Income Taxes, (“ASC 740”) clarify the accounting for uncertainty in income taxes recognized in financial statements and prescribe a recognition threshold and measurement attribute for uncertain tax positions taken or expected to be taken on a tax return. ASC 740 also requires that interest and penalties related to unrecognized tax benefits be recognized in the financial statements. The Company does not have any unrecognized tax benefits that would affect its financial position. Thus, no accruals for penalties and interest were necessary as of December 31, 2014 and 2013.
Use of Estimates	Use of Estimates – The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Commercial Real Estate Investments	Commercial Real Estate Investments Commercial Real Estate Loans – The Company's commercial real estate loans are comprised of fixed-rate and adjustable-rate loans. Commercial real estate loans are designated as held for investment and are carried at their outstanding principal balance, net of unamortized origination fees and costs, premiums or discounts, less a reserve for estimated losses if necessary. The difference between the principal amount of a loan and proceeds at acquisition is recorded as either a discount or premium. Origination fees and costs, premiums and discounts are amortized or accreted into interest income over the estimated life of the loan. Preferred Equity Interests Held for Investment – Preferred equity interests are designated as held for investment and are carried at their outstanding principal balance, net of unamortized origination fees and costs, premiums or discounts, less a reserve for estimated losses if necessary. Origination fees and costs, premiums and discounts are amortized or accreted into interest income over the estimated life of the investment. Allowance for Losses – The Company evaluates the need for a loss reserve on its commercial real estate loans and preferred equity interests held for investment (collectively referred to as “CRE Debt and Preferred Equity Investments”). A provision for losses related to CRE Debt and Preferred Equity Investments, including those accounted for under ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality, may be established when it is probable the Company will not collect amounts contractually due or all amounts previously estimated to be collectable. Management assesses the credit quality of the portfolio and adequacy of loan loss reserves on a quarterly basis, or more frequently as necessary. Significant judgment is required in this analysis. Depending on the expected recovery of its investment, the Company considers the estimated net recoverable value of the CRE Debt and Preferred Equity Investments as well as other factors, including but not limited to the fair value of any collateral, the amount and the status of any senior debt, the prospects for the borrower and the competitive landscape where the borrower conducts business. Because this determination is based upon projections of future economic events, which are inherently subjective, the amounts ultimately realized may differ materially from the carrying value as of the reporting date. The Company may be exposed to various levels of credit risk depending on the nature of its investments and the nature of the assets underlying the investments and credit enhancements, if any, supporting its assets. The Company’s core investment process includes procedures related to the initial approval and periodic monitoring of credit risk and other risks associated with each investment. The Company’s investment underwriting procedures include evaluation of the underlying borrowers’ ability to manage and operate their respective properties. Management reviews loan-to-value metrics upon either the origination or the acquisition of a new investment but generally does not update the loan-to-value metrics in the course of quarterly surveillance. Management generally reviews the most recent financial information produced by the borrower, which may include, but is not limited to, net operating income (“NOI”), debt service coverage ratios, property debt yields (net cash flow or NOI divided by the amount of outstanding indebtedness), loan per unit and rent rolls relating to each of the Company’s CRE Debt and Preferred Equity Investments, and may consider other factors management deems important. Management also reviews market pricing to determine each borrower’s ability to refinance their respective assets at the maturity of each loan. Management also reviews economic trends, both macro as well as those directly affecting the property, and the supply and demand of competing projects in the sub-market in which each subject property is located. In connection with the quarterly surveillance review process, loans are assigned an internal rating of “Performing”, “Watch List”, “Defaulted-Recovery” or “Impaired”. Loans that are deemed to be Performing meet all present contractual obligations and do not qualify for Watch List designation. Watch List loans are defined as Performing loans that are significantly lagging expectations and default is considered imminent. Defaulted–Recovery loans are currently in default; however full recovery of contractual principal and interest is expected. Impaired loans may or may not be in default, impairment is anticipated, and a loan loss provision has been recognized to reflect expected losses. Investments in Commercial Real Estate – Investments in commercial real estate are carried at historical cost less accumulated depreciation. Historical cost includes all costs necessary to bring the asset to the condition and location necessary for its intended use, including financing during the construction period. Costs directly related to acquisitions deemed to be business combinations are expensed. Ordinary repairs and maintenance which are not reimbursed by tenants are expensed as incurred. Major replacements and improvements that extend the useful life of the asset are capitalized and depreciated over their useful life. Investments in commercial real estate are depreciated using the straight-line method over the estimated useful lives of the assets, summarized as follows: Category Term Building 30-40 years Site improvements 2-10 years The Company follows the acquisition method of accounting for acquisitions of operating real estate held for investment, where the purchase price of operating real estate is allocated to tangible assets such as land, building, site improvements and other identified intangibles such as above/below market and in-place leases. The Company evaluates whether real estate acquired in connection with a foreclosure (“REO”) or UCC/deed in lieu of foreclosure (herein collectively referred to as a foreclosure) constitutes a business and whether business combination accounting is applicable. Upon foreclosure of a property, the excess of the carrying value of a loan, if any, over the estimated fair value of the property, less estimated costs to sell, is charged to provision for loan losses. Investments in commercial real estate, including REO, which do not meet the criteria to be classified as held for sale, are separately presented in the Consolidated Statements of Financial Condition as held for investment. Real estate held for sale is reported at the lower of its carrying value or its estimated fair value less estimated costs to sell. Once a property is determined to be held for sale, depreciation is no longer recorded. In addition, if considered material to the overall consolidated financial statements, the results of operations are reclassified to income (loss) from discontinued operations in the Consolidated Statements of Comprehensive Income (Loss). The Company's real estate portfolio (REO and real estate held for investment) is reviewed on a quarterly basis, or more frequently as necessary, to assess whether there are any indicators that the value of its operating real estate may be impaired or that its carrying value may not be recoverable. A property's value is considered impaired if the Company's estimate of the aggregate future undiscounted cash flows to be generated by the property is less than the carrying value of the property. In conducting this review, the Company considers U.S. macroeconomic factors, including real estate sector conditions, together with asset specific and other factors. To the extent impairment has occurred and is considered to be other than temporary, the loss will be measured as the excess of the carrying amount of the property over the calculated fair value of the property. Revenue Recognition – Commercial Real Estate Investments - Interest income is accrued based on the outstanding principal amount of the CRE Debt and Preferred Equity Investments and their contractual terms. Premiums and discounts associated with the purchase of CRE Debt and Preferred Equity Investments are amortized or accreted into interest income over the projected lives of the CRE Debt and Preferred Equity Investments using the interest method.
Broker Dealer Activities	Broker Dealer Activities In January 2014, RCap ceased its trading activity in U.S. Treasury securities, derivatives and securities borrowed and loaned transactions.
Reverse Repurchase Agreements	Reverse Repurchase Agreements – RCap enters into reverse repurchase agreements as part of its matched book trading activity. Reverse repurchase agreements are recorded on trade date at the contract amount and are collateralized by mortgage-backed or other securities. Margin calls are made by RCap as necessary based on the daily valuation of the underlying collateral as compared to the contract price. RCap generates income from the spread between what is earned on the reverse repurchase agreements and what is paid on the matched repurchase agreements. RCap’s policy is to obtain possession of collateral with a market value in excess of the principal amount loaned under reverse repurchase agreements. To ensure that the market value of the underlying collateral remains sufficient, collateral is valued daily, and RCap will require counterparties to deposit additional collateral, when necessary. All reverse repurchase activities are transacted under master repurchase agreements that give RCap the right, in the event of default, to liquidate collateral held and in some instances, to offset receivables and payables with the same counterparty.
Securities Borrowed and Loaned Transactions	Securities Borrowed and Loaned Transactions – RCap recorded securities borrowed and loaned transactions as collateralized financings. Securities borrowed transactions required RCap to provide the counterparty with collateral in the form of cash, or other securities. RCap received collateral in the form of cash or other securities for securities loaned transactions. RCap monitored the fair value of the securities borrowed and loaned on a daily basis, with additional collateral obtained or refunded as necessary. Securities borrowed and securities loaned transactions were recorded at contract value. For these transactions, the rebates accrued by RCap were recorded as interest income or expense.
U.S. Treasury Securities	U.S. Treasury Securities – RCap traded in U.S. Treasury securities for its proprietary portfolio, which consisted of long and short positions on U.S Treasury notes and bonds. U.S. Treasury securities were classified as trading investments and were recorded on the trade date at cost. Changes in fair value were reflected in Net gains (losses) on trading assets in the Company’s Consolidated Statement of Comprehensive Income (Loss). Interest income or expense on U.S. Treasury notes and bonds was accrued based on the outstanding principal amount of those investments and their stated terms. Derivatives - RCap entered primarily into U.S. Treasury, Eurodollar, federal funds, German government and U.S. equity index and currency futures and options contracts. RCap maintained a margin account which was settled daily with FCMs. Changes in the unrealized gains or losses on the futures and options contracts as well as any foreign exchange gains and losses were reflected in Net gains (losses) on trading assets in the Company’s Consolidated Statements of Comprehensive Income (Loss). Unrealized gains (losses) were excluded from net income (loss) in arriving at cash flows from operating activities in the Consolidated Statements of Cash Flows.