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Summary of Significant Accounting Policies (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 01, 2017
USD ($)
Mar. 31, 2017
variable_interest_entity
May 31, 2015
Jun. 30, 2018
USD ($)
securitization
Jun. 30, 2018
USD ($)
segment
securitization
Dec. 31, 2017
USD ($)
securitization
Mar. 31, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jan. 23, 2017
Dec. 31, 2006
securitization
Dec. 31, 2005
securitization
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Residential mortgage loans, delinquency period         90 days            
Real estate under development       $ 20,300,000 $ 20,300,000   $ 22,400,000        
Goodwill       25,222,000 25,222,000 $ 25,222,000          
Goodwill impairment $ 0                    
Restricted cash       5,695,000 5,695,000 11,000,000   $ 38,970,000      
Interest receivable       32,200,000 32,200,000 33,600,000          
Deferred finance costs, gross       400,000 400,000 700,000          
Employer contributions         $ 0 0          
Number of operating segments | segment         1            
Performance Share Awards                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Award vesting period     3 years                
6.25% senior convertible notes due 2022 | Convertible Notes                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Convertible note discount, percentage                 4.00%    
Discount and deferred issuance costs, net of amortization       $ 8,300,000 $ 8,300,000 $ 9,300,000          
Consolidated K-Series | K-Series                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Number of securitizations | securitization       7 7 7       4 4
Distressed Residential Mortgage Loans                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Deferred finance costs, gross       $ 300,000 $ 300,000 $ 700,000          
Held in Agency IO Portfolio for Trading Purposes                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Restricted cash           500,000          
Held by Counterparties as Collateral for Hedging Instruments                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Restricted cash           700,000          
Riverchase Landing and The Clusters                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Number of variable interest entities consolidated | variable_interest_entity   2                  
RBDHC | VIE, Primary Beneficiary                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Impairment of real estatement under development       2,100,000              
Net Loss Attributable to Noncontrolling Interest | RBDHC | VIE, Primary Beneficiary                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Impairment of real estatement under development       1,000,000              
Net Loss Attributable to Parent | RBDHC | VIE, Primary Beneficiary                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Impairment of real estatement under development       1,100,000              
Receivables and other assets                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Real estate under development       $ 20,300,000 $ 20,300,000 $ 22,900,000          
Minimum                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Finite-lived intangible asset, useful life         6 months            
Maximum                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Finite-lived intangible asset, useful life         10 years            
Building                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Components of real estate, useful life         30 years            
Building and Improvements | Minimum                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Components of real estate, useful life         10 years            
Building and Improvements | Maximum                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Components of real estate, useful life         30 years            
Furniture, Fixtures and Equipment                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Components of real estate, useful life         5 years