XML 52 R40.htm IDEA: XBRL DOCUMENT v3.21.2
Investments - Other Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Investments [Abstract]    
SERP Investments at fair value $ 2,165 $ 2,687
Cost method investments 10,905 10,536
Equity method investments 340 546
Total investments $ 13,410 $ 13,769