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Accumulated Other Comprehensive (Loss) / Income (Tables)
12 Months Ended
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Changes in Accumulated Other Comprehensive Income (Loss)
The changes in accumulated other comprehensive (loss) income during the years ended December 31, were as follows:
Balance at December 31, 2019Other comprehensive (loss) incomeTax effectBalance at December 31, 2020
Foreign currency$(28,204)$2,128 $(26,076)
Unrealized loss on intra-entity foreign currency transactions(4,306)3,130 (961)(2,137)
Unrealized holding gains (losses) on marketable debt securities(751)751 — — 
Total$(33,261)$6,009 $(961)$(28,213)
Balance at December 31, 2018Other comprehensive (loss) incomeTax effectBalance at December 31, 2019
Foreign currency$(26,436)$(1,768)$— $(28,204)
Unrealized income (loss) on intra-entity foreign currency transactions(3,906)(579)179 (4,306)
Unrealized holding gains (losses) on marketable debt securities(41)(710)— (751)
Total$(30,383)$(3,057)$179 $(33,261)
Balance at December 31, 2017Other comprehensive (loss) incomeTax effectBalance at December 31, 2018
Foreign currency$(20,284)$(6,152)$— $(26,436)
Unrealized (loss) income on intra-entity foreign currency transactions(3,085)(1,263)442 (3,906)
Unrealized holding gains (losses) on marketable debt securities(4)(37)— (41)
Total$(23,373)$(7,452)$442 $(30,383)