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STOCKHOLDERS' EQUITY - AOCI (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income        
Total after-tax amount $ 1,151,401 $ 929,067 $ 828,593 $ 763,043
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income        
Total pre-tax amount 9,566 4,977 1,586  
Total after-tax amount 7,103 3,699 1,190 $ 203
Unrecognized Net Periodic Benefit Credit        
Accumulated Other Comprehensive Income        
Total pre-tax amount 9,287 5,602 4,390  
Total after-tax amount 6,896 4,160 3,260  
Interest Rate Swap        
Accumulated Other Comprehensive Income        
Total pre-tax amount 3,526 419 (1,622)  
Total after-tax amount 2,604 309 (1,198)  
Foreign Currency Translation        
Accumulated Other Comprehensive Income        
Total pre-tax amount (3,247) (1,044) (1,182)  
Total after-tax amount $ (2,397) $ (770) $ (872)