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Fair Value of Financial Instruments Carrying Value and Estimated Fair Value of Financial Instruments (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Carrying Value  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 42,147
Borrowings under repurchase agreements 3,251,686
Convertible senior unsecured notes 108,743
Total 3,360,429
Estimated Fair Value  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 42,881
Borrowings under repurchase agreements 3,257,956
Convertible senior unsecured notes 114,819
Total 3,372,775
Residential Bridge Loans  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 42,147
Residential Bridge Loans | Estimated Fair Value  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 42,881