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ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Summary of Changes in Accumulated Other Comprehensive Income (Loss) Included Within Shareholders' Equity | A summary of changes in accumulated other comprehensive loss included within shareholders’ equity is as follows (in thousands):
| Twelve Months Ended December 31, 2018 |  | Twelve Months Ended December 31, 2017
| Foreign Currency Translation Adjustments |  | Foreign Currency Hedge |  | Defined benefit pension plans |  | Tax Provision |  | Total |  | Foreign Currency Translation Adjustments |  | Foreign Currency Hedge |  | Defined benefit pension plans |  | Tax Provision |  | Total
Balance at beginning of year | $ | (21,366 | ) |  | $ | 3,246 |  |  | $ | (7,221 | ) |  | $ | 5,545 |  |  | $ | (19,796 | ) |  | $ | (31,973 | ) |  | $ | 5,048 |  |  | $ | (10,518 | ) |  | $ | 8,443 |  |  | $ | (29,000 | )
Other comprehensive income (loss) | (9,241 | ) |  | 658 |  |  | (638 | ) |  | (3,045 | ) |  | (12,266 | ) |  | 10,607 |  |  | (1,802 | ) |  | 3,297 |  |  | (2,898 | ) |  | 9,204 |
Adoption of new accounting principle | — |  |  | — |  |  | — |  |  | (2,330 | ) |  | (2,330 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Balance at end of year | $ | (30,607 | ) |  | $ | 3,904 |  |  | $ | (7,859 | ) |  | $ | 170 |  |  | $ | (34,392 | ) |  | $ | (21,366 | ) |  | $ | 3,246 |  |  | $ | (7,221 | ) |  | $ | 5,545 |  |  | $ | (19,796 | )
Related Tax Effects Allocated to Each Component of Accumulated Other Comprehensive Income | The following table represents the related tax effects allocated to each component of other comprehensive income (loss) (in thousands):
| Twelve Months Ended December 31,
| 2018 |  | 2017 |  | 2016
| Gross Amount |  | Tax Effect |  | Net Amount |  | Gross Amount |  | Tax Effect |  | Net Amount |  | Gross Amount |  | Tax Effect |  | Net Amount
Foreign currency translation adjustments | $ | (9,241 | ) |  | $ | (2,923 | ) |  | $ | (12,164 | ) |  | $ | 10,607 |  |  | $ | (2,919 | ) |  | $ | 7,688 |  |  | $ | (3,849 | ) |  | $ | 1,351 |  |  | $ | (2,498 | )
Foreign currency hedge | 658 |  |  | (162 | ) |  | 496 |  |  | (1,802 | ) |  | 688 |  |  | (1,114 | ) |  | 481 |  |  | (181 | ) |  | 300 |
Defined benefit pension plans | (638 | ) |  | 40 |  |  | (598 | ) |  | 3,297 |  |  | (667 | ) |  | 2,630 |  |  | (10,518 | ) |  | 2,090 |  |  | (8,428 | )
Total | $ | (9,221 | ) |  | $ | (3,045 | ) |  | $ | (12,266 | ) |  | $ | 12,102 |  |  | $ | (2,898 | ) |  | $ | 9,204 |  |  | $ | (13,886 | ) |  | $ | 3,260 |  |  | $ | (10,626 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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