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Other Investments and Assets - Summary of Other Investments and Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Investments All Other Investments [Abstract]    
Self-insured liability receivable $ 9,982 $ 9,982
Contract costs 4,773 3,961
Other mutual funds 2,992 3,107
Cash surrender value of life insurance 176 24,873
Other 2,953 3,196
Other investments and assets $ 20,876 $ 45,119