Annual report pursuant to Section 13 and 15(d)

Credit facilities - Schedule of Credit Facilities (Details)

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Credit facilities - Schedule of Credit Facilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]    
Outstanding balance $ 31,199 $ 258,592
Senior Secured Revolving Credit Facility | Rep-Based Facility    
Line of Credit Facility [Line Items]    
Outstanding balance 0  
Value of collateral pledged to credit facility 31,000  
Senior Secured Revolving Credit Facility | Approval-Based Facility    
Line of Credit Facility [Line Items]    
Outstanding balance 31,000  
Value of collateral pledged to credit facility $ 164,000  
Weighted average short-term borrowing rate 3.20%