Commitments and Contingencies	6 Months Ended
Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Merger agreement. On February 26, 2016, the Company entered into an Agreement and Plan of Merger (as amended, the “Merger Agreement”) with Apollo Residential Mortgage, Inc., a Maryland corporation (“AMTG”), and Arrow Merger Sub, Inc., a Maryland corporation and a wholly-owned subsidiary of the Company (the “Merger Sub”), pursuant to which the Company will acquire AMTG for an aggregate purchase price equal to 89.25% of AMTG’s book value determined in accordance with the Merger Agreement, plus the assumption of $172,500 of AMTG’s 8.0% Series A Cumulative Redeemable Perpetual Preferred Stock (the “AMTG Preferred Stock”). The book value of AMTG, and therefore the actual purchase price payable, was determined as of July 22, 2016 (the “Pricing Date”), and will be subject to adjustment in the event that the closing of the transactions contemplated by the Merger Agreement does not occur by September 5, 2016. The aggregate number of shares of Company common stock issuable under the Merger Agreement is limited to 13,400,000 shares at a value of $16.75 per share, and the remainder of the consideration will be paid in cash. Upon the closing, each outstanding share of AMTG common stock will be converted into the right to receive (i) 0.417571 shares of Company common stock and (ii) $6.86 in cash, without interest; provided, however, that the cash portion of the merger consideration may be subject to certain adjustments. In addition , each share of AMTG Preferred Stock will be converted into one share of preferred stock, par value $0.01 per share, of a newly-designated series of the Company’s preferred stock, which the Company expects will be designated as 8.00% Series C Cumulative Redeemable Perpetual Preferred Stock. The Merger Agreement and related transactions were approved by all of the members of the Company's Board of Directors (with the exception of Mark Biderman, who recused himself). Consummation of the merger transaction is subject to the satisfaction of customary closing conditions, including the registration and listing of the shares of ARI stock that will be issued in the merger transaction and the approval and adoption of the Merger Agreement by the holders of a majority of the shares of AMTG common stock entitled to vote on the transaction, including a majority of the votes entitled to be cast by persons unaffiliated with Apollo Global Management, LLC. Company stockholder approval will not be required in connection with the transaction. On July 27, 2016, the Company filed with the SEC a definitive proxy statement/prospectus relating to the proposed transaction. Arrangements with Athene. In connection with financing the transactions contemplated by the Merger Agreement, on February 26, 2016 the Company entered into certain arrangements with certain subsidiaries of Athene Holding Ltd., an insurance holding company whose operating subsidiaries’ business is primarily issuing and reinsuring retirement savings products (collectively, “Athene”). The arrangements include (i) a bridge loan commitment from Athene USA Corporation, pursuant to which Athene has committed to provide the Company with up to $200,000 of term loans to consummate the merger transaction, (ii) an asset purchase agreement which provides that, promptly following the closing of the merger transaction, the Company will sell to Athene approximately $1,200,000 (subject to increase or decrease in certain circumstances) of primarily non-Agency Residential Mortgage Backed Securities at a price set as of the Pricing Date in accordance with the methodology set forth in the asset purchase agreement, and (iii) a stock purchase agreement, under which Athene has committed to purchase, during a specified period of time following the closing of the merger transaction, up to $20,000 (subject to reduction in certain circumstances) of Company common stock in the open market at the then-current market price if the quoted price of a share of Company common stock on the New York Stock Exchange at any time during such period is less than $16.75 (which is the value per share at which the Company common stock is to be issued to holders of AMTG common stock in the merger). Letter Agreement with the Manager. Concurrently with the execution of the Merger Agreement, the Company entered into a Letter Agreement with the Manager, pursuant to which the Manager has agreed to perform such services and activities as may be necessary to enable the Company to consummate the merger transaction. In consideration of the services provided and to be provided to the Company by the Manager in connection with the merger transaction and the process leading to the merger transaction, the Company agreed to pay the Manager an aggregate amount of up to $500, in monthly installments of $150 payable on the first of each calendar month between the execution of the Merger Agreement and the closing of the merger transaction. Upon consummation of the merger transaction, an additional amount (based on an agreed formula) will be added to Stockholders’ Equity (as defined in the Management Agreement) for purposes of calculating the amount of the management fee payable to the Manager under the Management Agreement. In addition, the Manager acknowledged that, as a result of the merger transaction, the management agreement between AMTG and its manager, ARM Manager, LLC (the “AMTG Management Agreement”), will be assigned to the Company and, following the merger transaction, any management fees paid by the Company to ARM Manager, LLC pursuant to the AMTG Management Agreement will offset, and therefore reduce (but not below zero), the Company’s obligation to pay corresponding management fees to the Manager. Legal Proceedings. From time to time, the Company may be involved in various claims and legal actions arising in the ordinary course of business. After the announcement of the execution of the Merger Agreement, two putative class action lawsuits challenging the proposed First Merger (as defined in the Merger Agreement), captioned Aivasian v. Apollo Residential Mortgage, Inc., et al., No. 24-C-16-001532 and Wiener v. Apollo Residential Mortgage, Inc., et al., No. 24-C-16-001837, were filed in the Circuit Court for Baltimore City, (the “Court”). A putative class and derivative lawsuit was later filed in the Court captioned Crago v. Apollo Residential Mortgage, Inc., No. 24-C-16-002610. Following a hearing on May 6, 2016, the Court entered orders among other things, consolidating the three actions under the caption In Re Apollo Residential Mortgage, Inc. Shareholder Litigation, Case No.: 24-C-16-002610. The plaintiffs have designated the Crago complaint as the operative complaint. The operative complaint includes both direct and derivative claims, names as defendants AMTG, the board of directors of AMTG (the “AMTG Board”), ARI, Merger Sub, Apollo and Athene and alleges, among other things, that the members of the AMTG Board breached their fiduciary duties to the AMTG stockholders and that the other corporate defendants aided and abetted such fiduciary breaches. The operative complaint further alleges, among other things, that the proposed First Merger involves inadequate consideration, was the result of an inadequate and conflicted sales process, and includes unreasonable deal protection devices that purportedly preclude competing offers. It also alleges that the transactions with Athene are unfair and that the registration statement on Form S-4 filed with the SEC on April 6, 2016 contains materially misleading disclosures and omits certain material information. The operative complaint seeks, among other things, certification of the proposed class, declaratory relief, preliminary and permanent injunctive relief, including enjoining or rescinding the First Merger, unspecified damages, and an award of other unspecified attorneys’ and other fees and costs. On May 6, 2016, counsel for the plaintiffs filed with the Court a stipulation seeking the appointment of interim co-lead counsel, which stipulation was approved by the Court on June 9, 2016. The defendants believe that the claims asserted in the complaints are without merit and intend to vigorously defend the lawsuits. Bremer Kreditbank AG. In September 2013, the Company, together with other affiliates of Apollo, reached an agreement to make an investment in an entity that agreed to acquire a minority participation in Bremer Kreditbank AG (“BKB”). The Company committed to invest up to approximately €38,000 (or $50,000), representing approximately 21% of the ownership in BKB. In September 2014, the Company, through a wholly owned subsidiary, acquired a 59% ownership interest in Champ LP following which a wholly-owned subsidiary of Champ LP then acquired a 35% ownership interest in BKB. In February 2015, the Company sold approximately 48% of its ownership interest in Champ LP at cost to an account managed by Apollo for approximately €16,314 (or $20,794). In June 2016, the Company transferred €427 of its unfunded commitment to Apollo, reducing its unfunded commitment to Champ LP to €2,802 (or $3,113). Through its interest in Champ LP, the Company now holds an indirect ownership interest of approximately 9.34% in BKB. Loan Commitments. As described in "Note 5 - Commercial Mortgage Loans" and "Note 6 - Subordinate Loans," respectively, at June 30, 2016, the Company had $69,311 of unfunded commitments related to its commercial mortgage loan portfolio and $85,825 of unfunded commitments related to its subordinate loan portfolio.

Commitments and Contingencies

Merger agreement. On February 26, 2016, the Company entered into an Agreement and Plan of Merger (as amended, the “Merger Agreement”) with Apollo Residential Mortgage, Inc., a Maryland corporation (“AMTG”), and Arrow Merger Sub, Inc., a Maryland corporation and a wholly-owned subsidiary of the Company (the “Merger Sub”), pursuant to which the Company will acquire AMTG for an aggregate purchase price equal to 89.25% of AMTG’s book value determined in accordance with the Merger Agreement, plus the assumption of $172,500 of AMTG’s 8.0% Series A Cumulative Redeemable Perpetual Preferred Stock (the “AMTG Preferred Stock”). The book value of AMTG, and therefore the actual purchase price payable, was determined as of July 22, 2016 (the “Pricing Date”), and will be subject to adjustment in the event that the closing of the transactions contemplated by the Merger Agreement does not occur by September 5, 2016. The aggregate number of shares of Company common stock issuable under the Merger Agreement is limited to 13,400,000 shares at a value of $16.75 per share, and the remainder of the consideration will be paid in cash. Upon the closing, each outstanding share of AMTG common stock will be converted into the right to receive (i) 0.417571 shares of Company common stock and (ii) $6.86 in cash, without interest; provided, however, that the cash portion of the merger consideration may be subject to certain adjustments. In addition , each share of AMTG Preferred Stock will be converted into one share of preferred stock, par value $0.01 per share, of a newly-designated series of the Company’s preferred stock, which the Company expects will be designated as 8.00% Series C Cumulative Redeemable Perpetual Preferred Stock.

The Merger Agreement and related transactions were approved by all of the members of the Company's Board of Directors (with the exception of Mark Biderman, who recused himself). Consummation of the merger transaction is subject to the satisfaction of customary closing conditions, including the registration and listing of the shares of ARI stock that will be issued in the merger transaction and the approval and adoption of the Merger Agreement by the holders of a majority of the shares of AMTG common stock entitled to vote on the transaction, including a majority of the votes entitled to be cast by persons unaffiliated with Apollo Global Management, LLC. Company stockholder approval will not be required in connection with the transaction. On July 27, 2016, the Company filed with the SEC a definitive proxy statement/prospectus relating to the proposed transaction.

Arrangements with Athene. In connection with financing the transactions contemplated by the Merger Agreement, on February 26, 2016 the Company entered into certain arrangements with certain subsidiaries of Athene Holding Ltd., an insurance holding company whose operating subsidiaries’ business is primarily issuing and reinsuring retirement savings products (collectively, “Athene”). The arrangements include (i) a bridge loan commitment from Athene USA Corporation, pursuant to which Athene has committed to provide the Company with up to $200,000 of term loans to consummate the merger transaction, (ii) an asset purchase agreement which provides that, promptly following the closing of the merger transaction, the Company will sell to Athene approximately $1,200,000 (subject to increase or decrease in certain circumstances) of primarily non-Agency Residential Mortgage Backed Securities at a price set as of the Pricing Date in accordance with the methodology set forth in the asset purchase agreement, and (iii) a stock purchase agreement, under which Athene has committed to purchase, during a specified period of time following the closing of the merger transaction, up to $20,000 (subject to reduction in certain circumstances) of Company common stock in the open market at the then-current market price if the quoted price of a share of Company common stock on the New York Stock Exchange at any time during such period is less than $16.75 (which is the value per share at which the Company common stock is to be issued to holders of AMTG common stock in the merger).

Letter Agreement with the Manager. Concurrently with the execution of the Merger Agreement, the Company entered into a Letter Agreement with the Manager, pursuant to which the Manager has agreed to perform such services and activities as may be necessary to enable the Company to consummate the merger transaction. In consideration of the services provided and to be provided to the Company by the Manager in connection with the merger transaction and the process leading to the merger transaction, the Company agreed to pay the Manager an aggregate amount of up to $500, in monthly installments of $150 payable on the first of each calendar month between the execution of the Merger Agreement and the closing of the merger transaction. Upon consummation of the merger transaction, an additional amount (based on an agreed formula) will be added to Stockholders’ Equity (as defined in the Management Agreement) for purposes of calculating the amount of the management fee payable to the Manager under the Management Agreement. In addition, the Manager acknowledged that, as a result of the merger transaction, the management agreement between AMTG and its manager, ARM Manager, LLC (the “AMTG Management Agreement”), will be assigned to the Company and, following the merger transaction, any management fees paid by the Company to ARM Manager, LLC pursuant to the AMTG Management Agreement will offset, and therefore reduce (but not below zero), the Company’s obligation to pay corresponding management fees to the Manager.

Legal Proceedings. From time to time, the Company may be involved in various claims and legal actions arising in the ordinary course of business.

After the announcement of the execution of the Merger Agreement, two putative class action lawsuits challenging the proposed First Merger (as defined in the Merger Agreement), captioned Aivasian v. Apollo Residential Mortgage, Inc., et al., No. 24-C-16-001532 and Wiener v. Apollo Residential Mortgage, Inc., et al., No. 24-C-16-001837, were filed in the Circuit Court for Baltimore City, (the “Court”). A putative class and derivative lawsuit was later filed in the Court captioned Crago v. Apollo Residential Mortgage, Inc., No. 24-C-16-002610. Following a hearing on May 6, 2016, the Court entered orders among other things, consolidating the three actions under the caption In Re Apollo Residential Mortgage, Inc. Shareholder Litigation, Case No.: 24-C-16-002610. The plaintiffs have designated the Crago complaint as the operative complaint. The operative complaint includes both direct and derivative claims, names as defendants AMTG, the board of directors of AMTG (the “AMTG Board”), ARI, Merger Sub, Apollo and Athene and alleges, among other things, that the members of the AMTG Board breached their fiduciary duties to the AMTG stockholders and that the other corporate defendants aided and abetted such fiduciary breaches. The operative complaint further alleges, among other things, that the proposed First Merger involves inadequate consideration, was the result of an inadequate and conflicted sales process, and includes unreasonable deal protection devices that purportedly preclude competing offers. It also alleges that the transactions with Athene are unfair and that the registration statement on Form S-4 filed with the SEC on April 6, 2016 contains materially misleading disclosures and omits certain material information. The operative complaint seeks, among other things, certification of the proposed class, declaratory relief, preliminary and permanent injunctive relief, including enjoining or rescinding the First Merger, unspecified damages, and an award of other unspecified attorneys’ and other fees and costs. On May 6, 2016, counsel for the plaintiffs filed with the Court a stipulation seeking the appointment of interim co-lead counsel, which stipulation was approved by the Court on June 9, 2016. The defendants believe that the claims asserted in the complaints are without merit and intend to vigorously defend the lawsuits.

Bremer Kreditbank AG. In September 2013, the Company, together with other affiliates of Apollo, reached an agreement to make an investment in an entity that agreed to acquire a minority participation in Bremer Kreditbank AG (“BKB”). The Company committed to invest up to approximately €38,000 (or $50,000), representing approximately 21% of the ownership in BKB. In September 2014, the Company, through a wholly owned subsidiary, acquired a 59% ownership interest in Champ LP following which a wholly-owned subsidiary of Champ LP then acquired a 35% ownership interest in BKB.

In February 2015, the Company sold approximately 48% of its ownership interest in Champ LP at cost to an account managed by Apollo for approximately €16,314 (or $20,794). In June 2016, the Company transferred €427 of its unfunded commitment to Apollo, reducing its unfunded commitment to Champ LP to €2,802 (or $3,113). Through its interest in Champ LP, the Company now holds an indirect ownership interest of approximately 9.34% in BKB.

Loan Commitments. As described in "Note 5 - Commercial Mortgage Loans" and "Note 6 - Subordinate Loans," respectively, at June 30, 2016, the Company had $69,311 of unfunded commitments related to its commercial mortgage loan portfolio and $85,825 of unfunded commitments related to its subordinate loan portfolio.