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Investment Securities Table (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Current $ 11,693 $ 14,687
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value 11,693 14,687
Available-for-sale Equity Securities, Amortized Cost Basis 30,527 27,661
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax 0 0
Available-for-sale Securities 30,527 27,661
Available-for-sale Debt Security Current [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Long-term Investments [Domain]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Equity Securities, Amortized Cost Basis 18,834 12,974
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax 0 0
Available-for-sale Securities $ 18,834 $ 12,974