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Commitments and Contingencies, Contractual Commitments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Agency Business Commitments |  |  |  |  |  |
Cash collateral | $ 249,090 | $ 94,847 | $ 249,090 | $ 94,847 | $ 197,470 | $ 210,875
Debt Obligations |  |  |  |  |  |
2021 (six months ending December 31, 2021) | 859,768 |  | 859,768 |  |  |
2022 | 2,496,580 |  | 2,496,580 |  |  |
2023 | 1,371,081 |  | 1,371,081 |  |  |
2024 | 1,017,797 |  | 1,017,797 |  |  |
2025 | 256,723 |  | 256,723 |  |  |
2026 | 340,026 |  | 340,026 |  |  |
Thereafter | 463,903 |  | 463,903 |  |  |
Total | 6,805,878 |  | 6,805,878 |  |  |
Minimum Annual Operating Lease Payments |  |  |  |  |  |
2021 (six months ending December 31, 2021) | 3,408 |  | 3,408 |  |  |
2022 | 8,257 |  | 8,257 |  |  |
2023 | 8,031 |  | 8,031 |  |  |
2024 | 7,926 |  | 7,926 |  |  |
2025 | 7,978 |  | 7,978 |  |  |
2026 | 8,282 |  | 8,282 |  |  |
Thereafter | 26,098 |  | 26,098 |  |  |
Total | 69,980 |  | 69,980 |  |  |
Total |  |  |  |  |  |
2021 | 863,176 |  | 863,176 |  |  |
2022 | 2,504,837 |  | 2,504,837 |  |  |
2023 | 1,379,112 |  | 1,379,112 |  |  |
2024 | 1,025,723 |  | 1,025,723 |  |  |
2025 | 264,701 |  | 264,701 |  |  |
2026 | 348,308 |  | 348,308 |  |  |
Thereafter | 490,001 |  | 490,001 |  |  |
Total | 6,875,858 |  | 6,875,858 |  |  |
Operating lease expense | 2,400 | $ 1,500 | 4,700 | $ 3,100 |  |
Unfunded CLO Commitments |  |  |  |  |  |
Unfunded commitments related to structured loans and investments | 524,700 |  | 524,700 |  | $ 353,800 |
Fannie Mae |  |  |  |  |  |
Agency Business Commitments |  |  |  |  |  |
Minimum liquid assets to be maintained to meet operational liquidity requirements | 19,100 |  | $ 19,100 |  |  |
Period of funding for collateral requirement |  |  | 48 months |  |  |
Forward Contracts |  |  |  |  |  |
Agency Business Commitments |  |  |  |  |  |
Period of contractual commitment |  |  | 60 days |  |  |
Restricted liquidity arrangement - loans sold under the Fannie Mae DUS program | Fannie Mae |  |  |  |  |  |
Agency Business Commitments |  |  |  |  |  |
Letter of credit assigned | 45,000 |  | $ 45,000 |  |  |
Cash collateral | 14,600 |  | 14,600 |  |  |
Reserve required to fund additional restricted liquidity over the next 48 months | 47,700 |  | $ 47,700 |  |  |
Period of additional funding for collateral requirement |  |  | 48 months |  |  |
Cash collateral arrangement - purchase and loss obligations under Freddie Mac's SBL Program |  |  |  |  |  |
Agency Business Commitments |  |  |  |  |  |
Cash collateral per securitization | 5,000 |  | $ 5,000 |  |  |
Outstanding letters of credit | $ 5,000 |  | $ 5,000 |  |  |

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