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Other Investments and Assets - Summary of Other Investments and Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Investments All Other Investments [Abstract] |  |
Self-insured liability receivable | $ 6,358 | $ 6,358
Other mutual funds | 3,970 | 3,457
Contract costs | 3,053 | 2,912
Other | 2,709 | 2,765
Other investments and assets | $ 16,090 | $ 15,492

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