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Credit Risk (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Credit Risk    
Total stockholder's equity $ 4,014,242 $ 3,378,588
Excess Capital 10,000  
Allowance for doubtful accounts 115 $ 195
Minimum    
Credit Risk    
Total stockholder's equity $ 25,000