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STOCKHOLDERS' EQUITY (AOCI) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Loss        
Total after-tax amount $ 763,043 $ 717,682 $ 651,462 $ 599,055
Amount remaining in unrecognized net periodic benefit costs portion of accumulated other comprehensive income for previous valuation allowance on deferred tax assets   4,000 4,000  
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Loss        
Total pre-tax amount 260 (13,836) (27,181)  
Total after-tax amount 203 (14,238) (20,574) $ (23,417)
Unrecognized Net Periodic Benefit Credit (Costs)        
Accumulated Other Comprehensive Loss        
Total pre-tax amount 2,898 (11,821) (25,768)  
Total after-tax amount 2,152 (12,749) (19,715)  
Interest Rate Swap, 2019        
Accumulated Other Comprehensive Loss        
Total pre-tax amount (563)      
Total after-tax amount (416) 591    
Interest Rate Swap, 2018 and 2017        
Accumulated Other Comprehensive Loss        
Total pre-tax amount   801 481  
Total after-tax amount   591 292  
Foreign Currency Translation        
Accumulated Other Comprehensive Loss        
Total pre-tax amount (2,075) (2,816) (1,894)  
Total after-tax amount $ (1,533) $ (2,080) $ (1,151)