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Summary of Significant Accounting Policies - Narrative (Details)
$ in Thousands
 12 Months Ended
Oct. 01, 2019
USD ($)
Dec. 31, 2021
USD ($)
segment
derivative
Dec. 31, 2020
USD ($)
derivative
Dec. 31, 2019
USD ($)
Apr. 27, 2021
Jan. 01, 2020
USD ($)
Dec. 31, 2018
USD ($)
Jan. 23, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Impairment of goodwill $ 0 $ 0 $ (25,222) $ 0        
Residential mortgage loans, past due period   30 days            
Residential mortgage loans, delinquency period   90 days            
Real estate, net held in Consolidated VIEs   $ 1,017,583 50,532          
Restricted cash and cash equivalents   $ 48,259 $ 11,307 2,849        
Derivative asset, number of instruments held | derivative   0 0          
Derivative liability, number of instruments held | derivative   0 0          
Reportable segment | segment   1            
Stockholders' equity   $ 2,365,390 $ 2,307,573 2,205,029     $ 1,180,293  
Cumulative Effect, Period of Adoption, Adjustment                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Stockholders' equity       $ 12,284   $ 12,300    
VIE, Primary Beneficiary                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Impairment of real estate   $ 1,800 1,900          
6.25% senior convertible notes due 2022 | Convertible Notes                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Interest rate   6.25%           6.25%
Senior Notes Due 2026                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Interest rate         5.75%      
Net Income (Loss) Attributable to Noncontrolling Interest | VIE, Primary Beneficiary                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Impairment of real estate   $ 900 1,000          
Net Loss Attributable to Parent | VIE, Primary Beneficiary                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Impairment of real estate   900 900          
Other Assets                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Real estate, net held in Consolidated VIEs   62,700 3,000          
Restricted cash and cash equivalents   48,300 11,300          
Receivables, loan services, recoverable advances and interest receivable   48,600 63,600          
Operating lease right-of-use asset   9,000 10,100          
Operating lease, liability, current   $ 9,600 $ 10,600          
Minimum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Finite-lived intangible asset, useful life   5 months            
Repurchase agreements, expiration period   11 months            
Maximum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Finite-lived intangible asset, useful life   10 years            
Repurchase agreements, expiration period   2 months            
Building                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Property, plant and equipment useful life   30 years            
Building Improvements | Minimum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Property, plant and equipment useful life   10 years            
Building Improvements | Maximum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Property, plant and equipment useful life   30 years            
Furniture and Fixtures                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Property, plant and equipment useful life   5 years