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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Foreign currency translation, tax $ 157 $ (29,448) $ 10,977
Prior service cost recognized in net periodic cost, tax (23) (39) (20)
Unamortized (loss) gain arising during the period, tax (447) 1,677 1,849
Plan amendments, tax (137) 74 0
Net loss recognized in net periodic cost, tax (1,588) (2,457) (2,489)
Foreign currency translation, tax (183) 413 (373)
Unrealized gain (loss) on derivatives arising during the period, tax (268) (631) 1,359
Reclassification adjustment on derivatives included in net income, tax $ 163 $ 83 $ (1,010)