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Select Balance Sheet Information - Schedule of Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Corporate-Owned Life Insurance Policies $ 38,205 $ 36,825
Debt Securities 9,209 9,260
Money Market Funds 1,862 4,075
Mutual Funds 5,141 1,662
Other Investments 29 34
Total Investments $ 54,446 $ 51,856