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Investments and other assets - Components of Investments and Other Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Investments, All Other Investments [Abstract] |  |
Cash value insurance | $ 50,300 | $ 48,919
Equity method investments | 16,810 | 17,003
Other equity investments | 20,158 | 20,158
Deferred debt issuance costs | 450 | 2,232
Long-term contract assets | 11,881 | 14,135
Other long-term assets | 19,240 | 24,047
Total | $ 118,839 | $ 126,494

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