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Investments in debt and equity securities - Debt Securities According to Contractual Terms (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Amortized costs    
In one year or less $ 69,702  
After one year through five years 313,470  
After five years through ten years 165,852  
After ten years 33,030  
Amortized costs, total 582,054 $ 592,648
Fair values    
In one year or less 70,474  
After one year through five years 326,654  
After five years through ten years 179,896  
After ten years 35,867  
Fair values, total $ 612,891 $ 605,721