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SUPPLEMENTAL STOCKHOLDERS’ EQUITY INFORMATION - Changes in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance, beginning of period     $ 1,927,209  
Other comprehensive (loss)/income before reclassifications, before tax     (986)  
Amounts reclassified from accumulated other comprehensive loss, before tax     13,217  
Income tax (benefit)/expense $ 1,209 $ 3,017 3,213 $ 3,969
Other comprehensive income, net of tax 3,393 8,501 9,018 11,051
Balance, end of period 1,980,252   1,980,252  
Foreign Currency Translation Adjustments        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance, beginning of period     (2,762)  
Other comprehensive (loss)/income before reclassifications, before tax     (2,701)  
Amounts reclassified from accumulated other comprehensive loss, before tax     0  
Income tax (benefit)/expense     (709)  
Other comprehensive income, net of tax     (1,992)  
Balance, end of period (4,754)   (4,754)  
Funded Status of Benefit Plans        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance, beginning of period     (363,874)  
Other comprehensive (loss)/income before reclassifications, before tax     0  
Amounts reclassified from accumulated other comprehensive loss, before tax     13,217  
Income tax (benefit)/expense     3,472  
Other comprehensive income, net of tax     9,745  
Balance, end of period (354,129)   (354,129)  
Net Unrealized Gain on Available-For-Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance, beginning of period     830  
Other comprehensive (loss)/income before reclassifications, before tax     1,715  
Amounts reclassified from accumulated other comprehensive loss, before tax     0  
Income tax (benefit)/expense     450  
Other comprehensive income, net of tax     1,265  
Balance, end of period 2,095   2,095  
Total Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance, beginning of period (360,181) (350,312) (365,806) (352,862)
Other comprehensive income, net of tax 3,393 8,501 9,018 11,051
Balance, end of period $ (356,788) $ (341,811) $ (356,788) $ (341,811)