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Affiliates - Narrative (Details) $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 22, 2019 USD ($) shares | May 29, 2018 USD ($) warrant shares | Jan. 26, 2018 USD ($) warrant shares | Jun. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) numberOfLoanPools | Dec. 31, 2018 transaction | Mar. 14, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred stock and warrants, net of offering costs |  |  |  | $ 130,000 | $ 124,977 | $ 0 |  |  |
Percentage of ownership interests in joint venture |  |  |  | 34.00% | 34.00% |  |  |  |
2017-D |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Percentage of ownership interests in joint venture |  |  |  | 50.00% | 50.00% |  |  |  |
Great Ajax II REIT |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Company ownership percentage |  |  |  |  | 99.80% |  |  |  |
Great Ajax II REIT | Third Party |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  | 0.20% | 0.20% |  |  |  |
Thetis |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 19.80% | 19.80% |  |  |  |
AS Ajax E LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 16.50% | 16.50% |  | 16.50% |  | 24.20%
Ajax E Master Trust | AS Ajax E LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 5.00% | 5.00% |  |  |  |
Unconsolidated Affiliates |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 100.00% | 100.00% |  |  |  |
Gaea |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred stock and warrants, net of offering costs | $ 66,300 |  |  |  |  |  |  |  |
Private placement share issuance | shares | 4,419,641 |  |  |  |  |  |  |  |
Ownership percentage | 23.20% |  |  |  |  |  |  |  |
Gaea | Third Party |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 76.80% |  |  |  |  |  |  |  |
Great Ajax FS LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 8.00% | 8.00% |  |  |  |
Number of transactions | transaction |  |  |  |  |  |  |  | 2 |
Percentage of equity interest at closing date |  | 3.10% | 4.90% |  |  |  |  |  |
Number of warrants | warrant |  | 3 | 3 |  |  |  |  |  |
Percentage of warrants exercisable |  | 1.55% | 2.45% |  |  |  |  |  |
Cash payment in business acquisition |  | $ 700 | $ 1,100 |  |  |  |  |  |
Number of shares (in shares) | shares |  | 29,063 | 45,938 |  |  |  |  |  |
Common stock value |  | $ 400 | $ 600 |  |  |  |  |  |
Legacy entities |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of entities | numberOfLoanPools |  |  |  |  |  |  | 3 |  |
Ownership percentage |  |  |  |  |  |  | 40.40% |  |
Cash payment in business acquisition |  |  |  |  |  |  | $ 1,000 |  |

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