Fair value measurements Debt (Details 5) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Fair value, balance sheet grouping [Line Items]
Long-term debt	$ 2,247,422	$ 2,365,667	$ 2,090,200
Carrying amount
Fair value, balance sheet grouping [Line Items]
Long-term debt	2,247,422	2,365,667	2,090,200
Fair value
Fair value, balance sheet grouping [Line Items]
Long-term debt, fair value	$ 1,949,905	$ 2,053,396	$ 1,940,092