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Accumulated Other Comprehensive Loss - Changes to Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 1,545,495 $ 1,649,497
Ending balance 1,498,819 1,613,710
Employee benefit costs    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (60,433) (50,082)
Other comprehensive income (loss) before reclassifications 1,819 (1,312)
Amounts reclassified from accumulated other comprehensive loss 3,427 2,207
Ending balance $ (55,187) $ (49,187)