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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2021
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) [ABSTRACT] |
Schedule of accumulated other comprehensive income (loss) | The following table presents changes in the accumulated balance for each component of Other comprehensive income (loss), including current period other comprehensive income (loss) and reclassifications out of accumulated other comprehensive income (loss) (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Foreign |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
​ | ​ | Currency | ​ | Derivative | ​ | ​ | ​ | ​ | ​ | ​ |
​ | ​ | Translation | ​ | Valuation, Net | ​ | Other, Net | ​ | ​ | ​ |
​ | ​ | Adjustment | ​ | of Tax | ​ | of Tax | ​ | Totals |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accumulated other comprehensive income (loss) at December 31, 2018 | ​ | $ | (114,168) | ​ | $ | (8,278) | ​ | $ | (2,150) | ​ | $ | (124,596) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income (loss) before reclassifications | ​ |  | 6,688 | ​ |  | 15,545 | ​ |  | (588) | ​ |  | 21,645 | ​
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | — | ​ |  | (3,085) | ​ |  | (198) | ​ |  | (3,283) | ​
Net current period other comprehensive (income) loss | ​ |  | 6,688 | ​ |  | 12,460 | ​ |  | (786) | ​ |  | 18,362 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accumulated other comprehensive income (loss) at December 31, 2019 | ​ | $ | (107,480) | ​ | $ | 4,182 | ​ | $ | (2,936) | ​ | $ | (106,234) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accumulated other comprehensive income (loss) at December 31, 2019 | ​ | $ | (107,480) |  | $ | 4,182 |  | $ | (2,936) |  | $ | (106,234) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income (loss) before reclassifications | ​ |  | 9,722 | ​ |  | 2,321 | ​ |  | 1,016 | ​ |  | 13,059 | ​
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | 19,619 | ​ |  | 1,928 | ​ |  | (528) | ​ |  | 21,019 | ​
Net current period other comprehensive income (loss) | ​ |  | 29,341 | ​ |  | 4,249 | ​ |  | 488 | ​ |  | 34,078 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accumulated other comprehensive income (loss) at December 31, 2020 | ​ | $ | (78,139) |  | $ | 8,431 |  | $ | (2,448) |  | $ | (72,156) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accumulated other comprehensive income (loss) at December 31, 2020 | ​ | $ | (78,139) |  | $ | 8,431 |  | $ | (2,448) |  | $ | (72,156) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income (loss) before reclassifications | ​ |  | (17,408) | ​ |  | (12,126) | ​ |  | (103) | ​ |  | (29,637) | ​
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | — | ​ |  | 3,655 | ​ |  | (288) | ​ |  | 3,367 | ​
Net current period other comprehensive income (loss) | ​ |  | (17,408) | ​ |  | (8,471) | ​ |  | (391) | ​ |  | (26,270) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accumulated other comprehensive income (loss) at December 31, 2021 | ​ | $ | (95,547) |  | $ | (40) |  | $ | (2,839) |  | $ | (98,426) | ​
Schedule of reclassifications from Accumulated other comprehensive income (loss) | The following table presents the classification and amount of the reclassifications from Accumulated other comprehensive income (loss) to the Statement of Comprehensive Income (Loss) (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Statement of |
​ | ​ | For the Year Ended December 31, | ​ | Comprehensive Income |
​ |  | 2021 |  | 2020 |  | 2019 |  | (Loss) Classification |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Derivative valuation | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Loss on foreign currency forward exchange contracts | ​ | $ | 4,939 | ​ | $ | 2,618 | ​ | $ | (4,228) |  | Revenue | ​
Tax effect | ​ |  | (1,284) | ​ |  | (690) | ​ |  | 1,143 |  | Provision for income taxes | ​
​ | ​ | $ | 3,655 | ​ | $ | 1,928 | ​ | $ | (3,085) |  | Net income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Actuarial loss on defined benefit plan | ​ | $ | (320) | ​ | $ | (588) | ​ | $ | (221) |  | Cost of services | ​
Tax effect | ​ |  | 32 | ​ |  | 60 | ​ |  | 23 |  | Provision for income taxes | ​
​ | ​ | $ | (288) | ​ | $ | (528) | ​ | $ | (198) |  | Net income (loss) | ​

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