Organization and Basis of Presentation	9 Months Ended
Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation Great Ajax Corp., a Maryland corporation (the “Company”), is an externally managed real estate company formed on January 30, 2014, and capitalized on March 28, 2014, by its then sole stockholder, Aspen Yo (“Aspen”), a company affiliated with Aspen Capital, the trade name for the Aspen group of companies. The Company was formed to facilitate capital raising activities and to operate as a mortgage real estate investment trust (“REIT”). The Company primarily targets acquisitions of re-performing loans (“RPLs”) including residential mortgage loans and small balance commercial mortgage loans (“SBC loans”) and originations of SBC loans. RPLs are mortgage loans on which at least five of the seven most recent payments have been made, or the most recent payment has been made and accepted pursuant to an agreement, or the full dollar amount, to cover at least five payments has been paid in the last seven months. The SBC loans that the Company intends to opportunistically target, through acquisitions, or originations, generally have a principal balance of up to $5.0 million and are secured by multi-family residential and commercial mixed use retail/residential properties. Purchased SBC loans are generally RPLs. Additionally, the Company may invest in both residential and non-residential commercial properties directly either through a foreclosure event of a loan in its mortgage portfolio or, through a direct acquisition. The Company may also target investments in non-performing loans (“NPL”). NPLs are loans on which the most recent three payments have not been made. The Company may acquire NPLs, either directly or with third-party institutional investors if attractive opportunities exist. The Company’s manager is Thetis Asset Management LLC (the “Manager” or “Thetis”), an affiliated company. The Company owns 19.8% of the Manager and 8.0% of Great Ajax FS LLC ("GAFS" or "The Parent of our Servicer") which owns substantially all of the interest in Gregory Funding LLC ("Gregory" or the "Servicer"), the Company's loan servicer. The Company’s mortgage loans and real properties are serviced by Gregory, also an affiliated company. The Company has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended (the “Code”). The Company conducts substantially all of its business through its operating partnership, Great Ajax Operating Partnership L.P., a Delaware limited partnership (the “Operating Partnership”), and its subsidiaries. The Company, through a wholly-owned subsidiary, is the sole general partner of the Operating Partnership. GA-TRS is a wholly-owned subsidiary of the Operating Partnership that owns the equity interest in the Manager and the Parent of the Servicer. The Company elected to treat GA-TRS as a taxable REIT subsidiary (“TRS”) under the Code. Great Ajax Funding LLC is a wholly-owned subsidiary of the Operating Partnership formed to act as the depositor of mortgage loans into securitization trusts and to hold the subordinated securities issued by such trusts and any additional trusts the Company may form for additional secured borrowings. The Company generally securitizes its mortgage loans through securitization trusts and retains subordinated securities from the secured borrowings. These trusts are considered to be VIEs, and the Company has determined that it is the primary beneficiary of many of these VIEs. AJX Mortgage Trust I and AJX Mortgage Trust II are wholly owned subsidiaries of the Operating Partnership formed to hold mortgage loans used as collateral for financings under the Company’s repurchase agreements. In addition, the Company, through its Operating Partnership, holds real estate owned properties (“REO”) acquired upon the foreclosure or other settlement of its owned NPLs, as well as through outright purchases. GAJX Real Estate LLC is a wholly-owned subsidiary of the Operating Partnership formed to own, maintain, improve and sell REO properties purchased by the Company. The Company has elected to treat GAJX Real Estate LLC as a TRS under the Code. In February 2018, the Company formed AJX Commercial Properties I to hold multi-family residential properties held as rentals. AJX Commercial Properties I is a wholly-owned subsidiary of the Operating Partnership. Basis of Presentation and Use of Estimates The consolidated interim financial statements should be read in conjunction with the Company's consolidated Financial Statements and the notes thereto for the period ended December 31, 2017, included in the Company's Annual Report on Form 10-K filed with the Securities and Exchange Commission (the "SEC") on March 8, 2018. Interim financial statements are unaudited and prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and pursuant to the requirements for reporting on Form 10-Q and Regulation S-X. In the opinion of management, all adjustments, consisting solely of normal recurring accruals considered necessary for the fair presentation of consolidated financial statements for the interim period presented, have been included. The current period’s results of operations will not necessarily be indicative of results that ultimately may be achieved for the fiscal year ending December 31, 2018. The consolidated interim financial statements have been prepared in accordance with U.S. GAAP, as contained within the Accounting Standards Codification (“ASC”) of the Financial Accounting Standards Board (“FASB”) and the rules and regulations of the SEC, as applied to interim financial statements. The Company consolidates the results and balances of securitization trusts when it determines it is the primary beneficiary of the trust. The trusts are established to provide debt financing to the Company. The Company also consolidates the results and balances of five subsidiaries with ownership interests held by third parties. AS Ajax E II LLC ("AS Ajax E II") holds a 5.0% interest in a Delaware trust that was formed to own residential mortgage loans and residential real estate assets; AS Ajax E II is 53.1% owned by the Company. Ajax Mortgage Loan Trusts 2017-D ("2017-D") and Ajax Mortgage Loan Trusts 2018-C (“2018-C”) are securitization trusts which holds mortgage loans, REO property and secured debt; 2017-D is 50.0% owned by the Company, and 2018-C is 63.0% owned by the Company. Banfield Holding LLC ("Banfield") holds an REO property that is 90.0% owned by the Company. The Company recognizes non-controlling interests in its consolidated financial statements for the amounts of the investments and income due to the third-party investors for its consolidated subsidiaries. The Operating Partnership is a majority owned partnership that has a non-controlling ownership interest that is included in non-controlling interests on the consolidated Balance Sheet. As of September 30, 2018, the Company owned 96.8% of the outstanding operating partnership units ("OP Units") and the remaining 3.2% of the OP Units were owned by an unaffiliated holder. All controlled subsidiaries are included in the Company's consolidated financial statements and all intercompany accounts and transactions have been eliminated in consolidation. The Company’s 19.8% investment in the Manager and 8.0% investment in GAFS are accounted for using the equity method because the Company can exercise influence on the operations of these entities through common officers and directors. There is no traded or quoted price for the interests in the Manager or GAFS since each is privately held. The preparation of consolidated financial statements in conformity with U.S. GAAP requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting periods. The Company considers significant estimates to include expected cash flows from mortgage loans and their resolution timelines, fair value measurements, and the net realizable value of REO properties held-for-sale.

Organization and Basis of Presentation

Great Ajax Corp., a Maryland corporation (the “Company”), is an externally managed real estate company formed on January 30, 2014, and capitalized on March 28, 2014, by its then sole stockholder, Aspen Yo (“Aspen”), a company affiliated with Aspen Capital, the trade name for the Aspen group of companies. The Company was formed to facilitate capital raising activities and to operate as a mortgage real estate investment trust (“REIT”). The Company primarily targets acquisitions of re-performing loans (“RPLs”) including residential mortgage loans and small balance commercial mortgage loans (“SBC loans”) and originations of SBC loans. RPLs are mortgage loans on which at least five of the seven most recent payments have been made, or the most recent payment has been made and accepted pursuant to an agreement, or the full dollar amount, to cover at least five payments has been paid in the last seven months. The SBC loans that the Company intends to opportunistically target, through acquisitions, or originations, generally have a principal balance of up to $5.0 million and are secured by multi-family residential and commercial mixed use retail/residential properties. Purchased SBC loans are generally RPLs. Additionally, the Company may invest in both residential and non-residential commercial properties directly either through a foreclosure event of a loan in its mortgage portfolio or, through a direct acquisition. The Company may also target investments in non-performing loans (“NPL”). NPLs are loans on which the most recent three payments have not been made. The Company may acquire NPLs, either directly or with third-party institutional investors if attractive opportunities exist. The Company’s manager is Thetis Asset Management LLC (the “Manager” or “Thetis”), an affiliated company. The Company owns 19.8% of the Manager and 8.0% of Great Ajax FS LLC ("GAFS" or "The Parent of our Servicer") which owns substantially all of the interest in Gregory Funding LLC ("Gregory" or the "Servicer"), the Company's loan servicer. The Company’s mortgage loans and real properties are serviced by Gregory, also an affiliated company. The Company has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended (the “Code”).

The Company conducts substantially all of its business through its operating partnership, Great Ajax Operating Partnership L.P., a Delaware limited partnership (the “Operating Partnership”), and its subsidiaries. The Company, through a wholly-owned subsidiary, is the sole general partner of the Operating Partnership. GA-TRS is a wholly-owned subsidiary of the Operating Partnership that owns the equity interest in the Manager and the Parent of the Servicer. The Company elected to treat GA-TRS as a taxable REIT subsidiary (“TRS”) under the Code. Great Ajax Funding LLC is a wholly-owned subsidiary of the Operating Partnership formed to act as the depositor of mortgage loans into securitization trusts and to hold the subordinated securities issued by such trusts and any additional trusts the Company may form for additional secured borrowings. The Company generally securitizes its mortgage loans through securitization trusts and retains subordinated securities from the secured borrowings. These trusts are considered to be VIEs, and the Company has determined that it is the primary beneficiary of many of these VIEs. AJX Mortgage Trust I and AJX Mortgage Trust II are wholly owned subsidiaries of the Operating Partnership formed to hold mortgage loans used as collateral for financings under the Company’s repurchase agreements. In addition, the Company, through its Operating Partnership, holds real estate owned properties (“REO”) acquired upon the foreclosure or other settlement of its owned NPLs, as well as through outright purchases. GAJX Real Estate LLC is a wholly-owned subsidiary of the Operating Partnership formed to own, maintain, improve and sell REO properties purchased by the Company. The Company has elected to treat GAJX Real Estate LLC as a TRS under the Code.

In February 2018, the Company formed AJX Commercial Properties I to hold multi-family residential properties held as rentals. AJX Commercial Properties I is a wholly-owned subsidiary of the Operating Partnership.

Basis of Presentation and Use of Estimates

The consolidated interim financial statements should be read in conjunction with the Company's consolidated Financial Statements and the notes thereto for the period ended December 31, 2017, included in the Company's Annual Report on Form 10-K filed with the Securities and Exchange Commission (the "SEC") on March 8, 2018.

Interim financial statements are unaudited and prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and pursuant to the requirements for reporting on Form 10-Q and Regulation S-X. In the opinion of management, all adjustments, consisting solely of normal recurring accruals considered necessary for the fair presentation of consolidated financial statements for the interim period presented, have been included. The current period’s results of operations will not necessarily be indicative of results that ultimately may be achieved for the fiscal year ending December 31, 2018. The consolidated interim financial statements have been prepared in accordance with U.S. GAAP, as contained within the Accounting Standards Codification (“ASC”) of the Financial Accounting Standards Board (“FASB”) and the rules and regulations of the SEC, as applied to interim financial statements.

The Company consolidates the results and balances of securitization trusts when it determines it is the primary beneficiary of the trust. The trusts are established to provide debt financing to the Company. The Company also consolidates the results and balances of five subsidiaries with ownership interests held by third parties. AS Ajax E II LLC ("AS Ajax E II") holds a 5.0% interest in a Delaware trust that was formed to own residential mortgage loans and residential real estate assets; AS Ajax E II is 53.1% owned by the Company. Ajax Mortgage Loan Trusts 2017-D ("2017-D") and Ajax Mortgage Loan Trusts 2018-C (“2018-C”) are securitization trusts which holds mortgage loans, REO property and secured debt; 2017-D is 50.0% owned by the Company, and 2018-C is 63.0% owned by the Company. Banfield Holding LLC ("Banfield") holds an REO property that is 90.0% owned by the Company. The Company recognizes non-controlling interests in its consolidated financial statements for the amounts of the investments and income due to the third-party investors for its consolidated subsidiaries. The Operating Partnership is a majority owned partnership that has a non-controlling ownership interest that is included in non-controlling interests on the consolidated Balance Sheet. As of September 30, 2018, the Company owned 96.8% of the outstanding operating partnership units ("OP Units") and the remaining 3.2% of the OP Units were owned by an unaffiliated holder. All controlled subsidiaries are included in the Company's consolidated financial statements and all intercompany accounts and transactions have been eliminated in consolidation.

The Company’s 19.8% investment in the Manager and 8.0% investment in GAFS are accounted for using the equity method because the Company can exercise influence on the operations of these entities through common officers and directors. There is no traded or quoted price for the interests in the Manager or GAFS since each is privately held.

The preparation of consolidated financial statements in conformity with U.S. GAAP requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting periods. The Company considers significant estimates to include expected cash flows from mortgage loans and their resolution timelines, fair value measurements, and the net realizable value of REO properties held-for-sale.