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