v3.26.1
SUPPLEMENTAL STOCKHOLDERS’ EQUITY INFORMATION - Changes in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance, beginning of period $ 2,041,363  
Other comprehensive loss before reclassifications, before tax (5,704)  
Amounts reclassified from accumulated other comprehensive loss, before tax 4,975  
Income tax (benefit)/expense (193) $ 2,080
Other comprehensive (loss)/income, net of tax (536) 5,834
Balance, end of period 2,001,481  
Foreign Currency Translation Adjustments    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance, beginning of period (4,883)  
Other comprehensive loss before reclassifications, before tax (1,927)  
Amounts reclassified from accumulated other comprehensive loss, before tax 0  
Income tax (benefit)/expense (510)  
Other comprehensive (loss)/income, net of tax (1,417)  
Balance, end of period (6,300)  
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 4,975  
Income tax (benefit)/expense 1,317  
Other comprehensive (loss)/income, net of tax 3,658  
Balance, end of period (359,604)  
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 (3,777)  
Amounts reclassified from accumulated other comprehensive loss, before tax 0  
Income tax (benefit)/expense (1,000)  
Other comprehensive (loss)/income, net of tax (2,777)  
Balance, end of period (438)  
Total Accumulated Other Comprehensive Loss    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance, beginning of period (365,806) (365,806)
Other comprehensive (loss)/income, net of tax (536) 5,834
Balance, end of period $ (366,342) $ (359,972)