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STOCKHOLDERS' EQUITY - AOCI (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income            
Total after-tax amount $ 1,220,733 $ 1,211,361 $ 1,151,401 $ 1,126,292 $ 1,063,212 $ 929,067
Accumulated Other Comprehensive Income            
Accumulated Other Comprehensive Income            
Total pre-tax amount 7,518   9,566      
Total after-tax amount 5,586 $ 6,569 7,103 3,978 $ 4,974 3,699
Unrecognized Net Periodic Benefit Credit            
Accumulated Other Comprehensive Income            
Total pre-tax amount 8,289   9,287      
Total after-tax amount 6,155   6,896 3,738   4,160
Interest Rate Swap            
Accumulated Other Comprehensive Income            
Total pre-tax amount 2,468   3,526      
Total after-tax amount 1,823   2,604 2,692   309
Foreign Currency Translation            
Accumulated Other Comprehensive Income            
Total pre-tax amount (3,239)   (3,247)      
Total after-tax amount $ (2,392)   $ (2,397) $ (2,452)   $ (770)