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Subsequent Events (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Apr. 30, 2020
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Subsequent Event [Line Items]        
Outstanding repurchase agreements   $ 713,364   $ 2,352,102
Cash margin outstanding   137,200    
Payments for repurchase agreement financing   $ 1,677,506 $ (141,153)  
Subsequent Event        
Subsequent Event [Line Items]        
Settlement of outstanding receivable for securities sold $ 213,600      
Outstanding repurchase agreements 248,800      
Payments for repurchase agreement financing $ 562,900