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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Comprehensive Income [Abstract] |  |  |
Foreign currency translation, tax | $ (29,448) | $ 10,977 | $ 24,150
Prior service cost recognized in net periodic cost, tax | (39) | (20) | 0
Unamortized (loss) gain arising during the period, tax | 1,677 | 1,849 | 1,469
Plan amendments, tax | 74 | 0 | 0
Net loss recognized in net periodic cost, tax | (2,457) | (2,489) | (2,242)
Foreign currency translation, tax | 413 | (373) | (316)
Unrealized gain (loss) on derivatives arising during the period, tax | (631) | 1,359 | 379
Reclassification adjustment on derivatives included in net income, tax | $ 83 | $ (1,010) | $ (196)

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- Definition Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Pension and Other Postretirement Benefit Plans, Tax + References No definition available. + Details
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