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Accumulated Other Comprehensive (Loss) / Income | 12 Months Ended
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Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Accumulated Other Comprehensive (Loss) / Income | Accumulated Other Comprehensive (Loss) / Income The changes in accumulated other comprehensive (loss) income during the years ended December 31, were as follows:
| Balance at December 31, 2019 |  | Other comprehensive (loss) income |  | Tax effect |  | Balance 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, 2018 |  | Other comprehensive (loss) income |  | Tax effect |  | Balance 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, 2017 |  | Other comprehensive (loss) income |  | Tax effect |  | Balance 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) |

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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