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Financings - Collateral at Risk Under its Repurchase Agreements Greater than 10% (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Credit Suisse AG, Cayman Islands Branch  
Amounts of collateral at risk under its repurchase agreements greater than 10% of the Company's equity with any counterparty  
Amount of Collateral at Risk, at fair value $ 132,306
Weighted Average Remaining Maturity (days) 1024 days
Percentage of Stockholders' Equity 23.40%
Barclays Capital Inc.  
Amounts of collateral at risk under its repurchase agreements greater than 10% of the Company's equity with any counterparty  
Amount of Collateral at Risk, at fair value $ 73,203
Weighted Average Remaining Maturity (days) 38 days
Percentage of Stockholders' Equity 13.00%