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Summary of Significant Accounting Policies - Accounting Standards (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 60,193 $ 88,179
Operating Lease, Right-of-Use Asset $ 5,846  
Equity Funds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fair Value   $ 0