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Investments - Other Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Investments [Abstract]    
SERP Investments at fair value $ 2,687 $ 2,278
Cost method investments 10,536 9,497
Equity method investments 546 613
Total investments $ 13,769 $ 12,388