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Loans Receivable - Summary of Real Estate Loans Receivable (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Carrying Value | $ 1,407,852 |  |  |
Allowance for credit losses on real estate loans receivable | (165,693) | $ (166,785) | $ (224,146) | $ (224,036)
Real estate loans receivable, net of credit allowance | 1,003,136 | 1,068,681 |  |
Non-real estate loans | 390,559 | 375,060 |  |
Allowance for credit losses on non-real estate loans receivable | (151,536) | (151,433) |  |
Non-real estate loans receivable, net of credit allowance | 239,023 | 223,627 |  |
Total loans receivable, net of credit allowance | 1,242,159 | 1,292,308 |  |
Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Carrying Value | 833,070 | 889,556 |  |
Other real estate loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan Carrying Value | 184,223 | 194,477 |  |
Allowance for credit losses on real estate loans receivable |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses on real estate loans receivable | $ (14,157) | $ (15,352) |  |

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