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Accumulated Other Comprehensive Loss - Changes to Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 1,573,928 $ 1,429,755
Ending balance 1,591,144 1,548,575
Employee benefit costs    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (40,587) (12,162)
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive loss 750 (488)
Ending balance $ (39,837) $ (12,650)