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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]      
Cash flow hedges adjustment, tax amount $ (10) $ (89) $ (61)
Pension adjustment, tax amount $ 778 $ 785 $ 613