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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Amounts reclassified out of each component of accumulated other comprehensive income    
Tax benefit $ (6,067) $ (5,759)
Net income 11,181 10,395
Amount Reclassified from AOCI    
Amounts reclassified out of each component of accumulated other comprehensive income    
Net income (250) (260)
Defined Benefit Plans | Amount Reclassified from AOCI    
Amounts reclassified out of each component of accumulated other comprehensive income    
Total before tax (376) (429)
Tax benefit 126 169
Net actuarial losses | Amount Reclassified from AOCI    
Amounts reclassified out of each component of accumulated other comprehensive income    
Total before tax (367) (420)
Net transition obligation | Amount Reclassified from AOCI    
Amounts reclassified out of each component of accumulated other comprehensive income    
Total before tax (4) (4)
Prior service cost | Amount Reclassified from AOCI    
Amounts reclassified out of each component of accumulated other comprehensive income    
Total before tax $ (5) $ (5)