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Fair Value of Financial Instruments - Carrying Value and Estimated Fair Value of Company's Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Participations sold $ (25,130) $ (27,064)
Commercial Mortgage Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Participations sold (25,130) (27,064)
Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cash and cash equivalents 222,030 343,106
Carrying Value | Level III    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured debt arrangements, net (5,296,825) (4,150,268)
Participations sold (25,130) (27,064)
Carrying Value | Level III | Secured Debt    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Term loans, net (763,813) (768,325)
Carrying Value | Level III | Senior Notes    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Term loans, net (494,844) (494,051)
Carrying Value | Level III | 2022 Notes    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes 0 (343,117)
Carrying Value | Level III | 2023 Notes    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (229,361) (226,862)
Carrying Value | Level III | Commercial Mortgage Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 8,121,109 7,012,312
Carrying Value | Level III | Subordinate Mortgage Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 560,881 844,948
Estimate of Fair Value Measurement    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Cash and cash equivalents 222,030 343,106
Estimate of Fair Value Measurement | Level III    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured debt arrangements, net (5,296,825) (4,150,268)
Participations sold (25,130) (27,064)
Estimate of Fair Value Measurement | Level III | Secured Debt    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Term loans, net (731,709) (782,995)
Estimate of Fair Value Measurement | Level III | Senior Notes    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Term loans, net (400,950) (489,175)
Estimate of Fair Value Measurement | Level III | 2022 Notes    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes 0 (347,552)
Estimate of Fair Value Measurement | Level III | 2023 Notes    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes (225,366) (231,150)
Estimate of Fair Value Measurement | Level III | Commercial Mortgage Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 8,083,410 6,945,038
Estimate of Fair Value Measurement | Level III | Subordinate Mortgage Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans $ 558,740 $ 725,906