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Related Party Transactions - Transfer of Employees to Newmark and Other Related Party Transactions (Details) shares in Millions |  | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
May 01, 2018 USD ($) employee | Jul. 31, 2020 USD ($) | Feb. 28, 2019 USD ($) | Oct. 31, 2018 USD ($) shares | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
Related Party Transaction |  |  |  |  |  |  |  |
Total stockholders’ equity |  |  |  |  | $ 1,225,221,000 | $ 655,049,000 |  |
Redeemable partnership interests |  |  |  |  | 20,407,000 | 20,045,000 |  | $ 21,517,000
Payables to related parties |  |  |  |  | $ 548,000 | $ 4,392,000 |  |
CCRE |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |
Number of employees transferred | employee | 5 |  |  |  |  |  |  |
Proceeds from limited partnership units |  |  |  | $ 6,900,000 |  |  |  |
Total stockholders’ equity | $ 6,900,000 |  |  |  |  |  |  |
Redeemable partnership interests | 2,200,000 |  |  |  |  |  |  |
Maximum revenue share to related party in first two years | $ 3,300,000 |  |  |  |  |  |  |
Payments to related party |  | $ 3,300,000 |  |  |  |  |  |
Payables to related parties |  |  |  |  |  |  | $ 3,300,000 |
CCRE | Newmark Holdings, L.P. |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |
Proceeds from issuance of EPUs |  |  |  | 6,700,000 |  |  |  |
Limited partnership unit cash distributions |  |  |  | $ 200,000 |  |  |  |
Issuance of additional limited partners units in exchange (in shares) | shares |  |  |  | 2.2 |  |  |  |
Issuance of additional limited partners units in exchange for cash payment |  |  |  | $ 500,000 |  |  |  |
Issuance of additional limited partnership units with capital account |  |  |  | $ 2,200,000 |  |  |  |
Cantor Fitzgerald Limited Partnership And B G C Partners Incorporation | Government Sponsored Enterprise Loans |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |
Maximum amount per loan |  |  | $ 100,000,000.0 |  |  |  |  |
Limit on loans that have not yet been acquired or sold |  |  | 250,000,000.0 |  |  |  |  |
Limit on loans outstanding |  |  | $ 250,000,000.0 |  |  |  |  |

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