Related Party Transactions	6 Months Ended
Related Party Transactions	Jun. 30, 2021
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Management Agreement In connection with our initial public offering in September 2009, we entered into a management agreement (the "Management Agreement") with the Manager, which describes the services to be provided by the Manager and its compensation for those services. The Manager is responsible for managing our day-to-day operations, subject to the direction and oversight of our board of directors. Pursuant to the terms of the Management Agreement, the Manager is paid a base management fee equal to 1.5% per annum of our stockholders’ equity (as defined in the Management Agreement), calculated and payable (in cash) quarterly in arrears. The current term of the Management Agreement will expire on September 29, 2021, and is automatically renewed for successive one-year terms on each anniversary thereafter. The Management Agreement may be terminated upon expiration of the one-year extension term only upon the affirmative vote of at least two-thirds of our independent directors, based upon (1) unsatisfactory performance by the Manager that is materially detrimental to ARI or (2) a determination that the management fee payable to the Manager is not fair, subject to the Manager’s right to prevent such a termination based on unfair fees by accepting a mutually acceptable reduction of management fees agreed to by at least two-thirds of our independent directors. The Manager must be provided with written notice of any such termination at least 180 days prior to the expiration of the then existing term and will be paid a termination fee equal to three times the sum of the average annual base management fee 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. Following a meeting by our independent directors in February 2021, which included a discussion of the Manager’s performance and the level of the management fees thereunder, we determined not to seek termination of the Management Agreement. We incurred approximately $9.4 million and $18.8 million in base management fees under the Management Agreement for the three and six months ended June 30, 2021, respectively, as compared to $10.0 million and $20.2 million for the three and six months ended June 30, 2020, respectively. In addition to the base management fee, we are also responsible for reimbursing the Manager for certain expenses paid by the Manager on our behalf or for certain services provided by the Manager to us. For the three and six months ended June 30, 2021 we paid expenses totaling $0.7 million and $1.3 million, respectively, related to reimbursements for certain expenses paid by the Manager on our behalf under the Management Agreement as compared to $0.5 million and $1.1 million for the three and six months ended June 30, 2020, respectively. Expenses incurred by the Manager and reimbursed by us are reflected in the respective condensed consolidated statement of operations expense category or our condensed consolidated balance sheet based on the nature of the item. Included in payable to related party on our condensed consolidated balance sheet at June 30, 2021 and December 31, 2020 are approximately $9.4 million and $9.6 million, respectively, for base management fees incurred but not yet paid under the Management Agreement. Loans receivable In June 2015, we originated a $20.0 million mezzanine loan secured by pledges of equity interests in the property recorded as real estate owned on our condensed consolidated balance sheet at June 30, 2021. The mezzanine loan was subordinate to (i) a $110.0 million mortgage loan, originated by a third party, and (ii) a $24.5 million senior mezzanine loan, originated by an affiliate of the Manager. On May 24, 2021, we purchased the $24.5 million senior mezzanine loan at par from the affiliate and acquired legal title to the hotel through a deed-in-lieu of foreclosure. Refer to "Note 5 – Real Estate Owned and Related Debt" for additional information. In January 2020, we sold £62.2 million ($81.3 million assuming conversion into USD) in a mezzanine loan and £50.0 million ($65.3 million assuming conversion into USD) unfunded commitment of a senior mortgage secured by a mixed-use property in London, United Kingdom to a fund managed by an affiliate of the Manager, that was originated by us in December 2019. This transaction was evaluated under ASC 860, "Transfers and Servicing," and we determined that it qualifies as a sale and accounted for as such (see "Note 4 -Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net"). Term Loan In March 2021, Apollo Global Funding, LLC, an affiliate of the Manager, served as one of the eight arrangers for the issuance of our 2028 Term Loan and received $0.2 million of arrangement fees. In addition, funds managed by an affiliate of the Manager invested in $30.0 million of the 2028 Term Loan. Senior Secured Notes In June 2021, Apollo Global Securities, LLC, an affiliate of the Manager, served as one of the eight initial purchasers in the issuance of our 2029 Notes and received $0.4 million of initial purchasers' discounts and commissions.