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Financial Derivatives Narrative (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Derivative [Line Items]    
U.S. Treasury securities sold short, at fair value $ 2,154 $ 2,070
US Treasury Securities [Member]    
Derivative [Line Items]    
U.S. Treasury securities sold short, at fair value 2,200 2,100
Investment Sold, Not yet Purchased, Balance, Principal Amount $ 2,000 $ 2,100