v3.26.1
SUPPLEMENTAL STOCKHOLDERS’ EQUITY INFORMATION - Changes in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance, beginning of period     $ 2,041,363  
Other comprehensive loss before reclassifications, before tax     (8,862)  
Amounts reclassified from accumulated other comprehensive loss, before tax     9,949  
Income tax (benefit)/expense $ 479 $ (76) 286 $ 2,004
Other comprehensive income/(loss), net of tax 1,337 (209) 801 5,625
Balance, end of period 2,047,536   2,047,536  
Foreign Currency Translation Adjustments        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance, beginning of period     (4,883)  
Other comprehensive loss before reclassifications, before tax     (2,846)  
Amounts reclassified from accumulated other comprehensive loss, before tax     0  
Income tax (benefit)/expense     (750)  
Other comprehensive income/(loss), net of tax     (2,096)  
Balance, end of period (6,979)   (6,979)  
Funded Status of Benefit Plans        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance, beginning of period     (363,262)  
Other comprehensive loss before reclassifications, before tax     0  
Amounts reclassified from accumulated other comprehensive loss, before tax     9,949  
Income tax (benefit)/expense     2,621  
Other comprehensive income/(loss), net of tax     7,328  
Balance, end of period (355,934)   (355,934)  
Net Unrealized Gain/(Loss) on Available-For-Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance, beginning of period     2,339  
Other comprehensive loss before reclassifications, before tax     (6,016)  
Amounts reclassified from accumulated other comprehensive loss, before tax     0  
Income tax (benefit)/expense     (1,585)  
Other comprehensive income/(loss), net of tax     (4,431)  
Balance, end of period (2,092)   (2,092)  
Total Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance, beginning of period (366,342) (359,972) (365,806) (365,806)
Other comprehensive income/(loss), net of tax 1,337 (209) 801 5,625
Balance, end of period $ (365,005) $ (360,181) $ (365,005) $ (360,181)