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STOCKHOLDERS' EQUITY (AOCI) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Loss        
Total after-tax amount $ 717,682 $ 651,462 $ 599,055 $ 588,728
Amount remaining in unrecognized net periodic benefit costs portion of accumulated other comprehensive income for previous valuation allowance on deferred tax assets 4,000      
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Loss        
Total pre-tax amount (13,836) (27,181) (31,840)  
Total after-tax amount (14,238) (20,574) (23,417) $ (27,496)
Unrecognized Net Periodic Benefit Costs        
Accumulated Other Comprehensive Loss        
Total pre-tax amount (11,821) (25,768) (29,320)  
Total after-tax amount (12,749) (19,715) (21,886)  
Interest Rate Swap        
Accumulated Other Comprehensive Loss        
Total pre-tax amount 801 481 (542)  
Total after-tax amount 591 292 (329)  
Foreign Currency Translation        
Accumulated Other Comprehensive Loss        
Total pre-tax amount (2,816) (1,894) (1,978)  
Total after-tax amount $ (2,080) $ (1,151) $ (1,202)