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Accumulated Other Comprehensive Loss - Schedule of Changes to Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 1,649,497 $ 1,573,928
Ending balance 1,614,838 1,591,144
Employee benefit costs    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (50,082) (40,587)
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive loss 1,087 750
Ending balance $ (48,995) $ (39,837)