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Summary of Significant Accounting Policies - Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Accounting Policies [Abstract]    
Corporate-Owned Life Insurance Policies $ 41,078 $ 36,825
Corporate and Government Debt Securities 9,202 9,260
Mutual Funds 5,432 1,662
Money Market Funds 949 4,075
Other Investments 29 34
Total Investments $ 56,690 $ 51,856