v3.26.3
SUPPLEMENTAL STOCKHOLDERS’ EQUITY INFORMATION - Changes in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance, beginning of period     $ 2,041,363  
Other comprehensive loss before reclassifications, before tax     (13,964)  
Amounts reclassified from accumulated other comprehensive loss, before tax     14,923  
Income tax (benefit)/expense $ (34) $ 1,209 252 $ 3,213
Other comprehensive (loss)/income, net of tax (94) 3,393 707 9,018
Balance, end of period 2,045,258   2,045,258  
Foreign Currency Translation Adjustments        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance, beginning of period     (4,883)  
Other comprehensive loss before reclassifications, before tax     (2,667)  
Amounts reclassified from accumulated other comprehensive loss, before tax     0  
Income tax (benefit)/expense     (703)  
Other comprehensive (loss)/income, net of tax     (1,964)  
Balance, end of period (6,847)   (6,847)  
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     14,923  
Income tax (benefit)/expense     3,931  
Other comprehensive (loss)/income, net of tax     10,992  
Balance, end of period (352,270)   (352,270)  
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     (11,297)  
Amounts reclassified from accumulated other comprehensive loss, before tax     0  
Income tax (benefit)/expense     (2,976)  
Other comprehensive (loss)/income, net of tax     (8,321)  
Balance, end of period (5,982)   (5,982)  
Total Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance, beginning of period (365,005) (360,181) (365,806) (365,806)
Other comprehensive (loss)/income, net of tax (94) 3,393 707 9,018
Balance, end of period $ (365,099) $ (356,788) $ (365,099) $ (356,788)