Investments and other assets - Components of Investments and Other Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Investments, All Other Investments [Abstract]
Cash value insurance	$ 49,567	$ 48,919
Equity method investments	16,587	17,003
Other equity investments	19,526	20,158
Deferred debt issuance costs	0	2,232
Long-term contract assets	10,907	14,135
Other long-term assets	17,632	24,047
Total	$ 114,219	$ 126,494