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Indebtedness (Details)
$ in Thousands
Jun. 30, 2020
USD ($)
Indebtedness  
Short-term notes payable $ 94,962
Senior 5.75% unsecured notes due, 2021 ("Series B Notes")  
Indebtedness  
Fair value of outstanding indebtedness 97,100
Short-term notes payable $ 95,000