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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
 9 Months Ended
Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
The changes in accumulated other comprehensive income/(loss) were as follows:
 Three Months Ended
September 30,		Nine Months Ended
September 30,
 2021202020212020
Net foreign currency translation adjustment$(3,362)$4,313 $(7,981)$7,440 
Net change of cash flow hedge (see Note 19 for further information)
Unrealized gain (loss) on cash flow hedge450 299 1,583 (3,585)
Tax(109)(72)(379)926 
Net of tax341 227 1,204 (2,659)
Net change in postretirement benefit plan (see Note 14 for further information)
Amortization of prior service cost18 18 55 56 
Amortization of gain(4)(12)(16)(38)
Prior service credit— — (4)— 
Total before tax14 6 35 18 
Tax(3)2 (9)3 
Adjustment (1)
— 129 — (455)
Net of tax and adjustment11 137 26 (434)
Total other comprehensive (loss) income$(3,010)$4,677 $(6,751)$4,347 
(1) One time adjustment to the postretirement account.
Included in "Net foreign currency translation adjustment" were gains of $1,715 and $3,888, related to a net investment hedge, which were net of taxes of $553 and $1,243 for the three and nine months ended September 30, 2021, respectively. Included in "Net foreign currency translation adjustment" were losses of $3,891 and $986, related to a net investment hedge, which were net of taxes of $1,244 and $330 for the three and nine months ended September 30, 2020, respectively. See Note 19, "Derivative Instruments and Hedging Activities."
Accumulated other comprehensive income/(loss) at September 30, 2021 and December 31, 2020 consisted of the following:
 Foreign currency
translation
adjustment		Cash flow hedgePostretirement
benefit plan		Total
Balance December 31, 2020$7,653 $(3,684)$204 $4,173 
Other comprehensive (loss) income(7,981)1,204 26 (6,751)
Balance September 30, 2021$(328)$(2,480)$230 $(2,578)