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Other Investments and Assets - Summary of Other Investments and Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Investments All Other Investments [Abstract]    
Cash surrender value of life insurance $ 23,892 $ 23,815
Self-insured liability receivable 9,176 9,176
Contract costs 3,769 3,461
Other mutual funds 2,993 2,517
Other 4,058 3,941
Other investments and assets $ 43,888 $ 42,910