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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (INCOME STATEMENT CLASSIFICATION TABLE) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Presentation of Income Statement Reclassifications [Line Items] |  |  |  |
Sales Revenue Services Net | $ 392,515 | $ 349,853 | $ 786,871 | $ 725,102
Interest Expense. | 4,208 | 7,765 | 9,496 | 14,224
Benefit from (provision for) income taxes | (7,345) | (653) | (14,811) | (2,755)
Net income | 13,614 | 6,297 | 34,090 | 12,229
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Presentation of Income Statement Reclassifications [Line Items] |  |  |  |
Net Income (Loss) - Other |  |  | 2,682 | 7,659
Derivative Valuation, Net of Tax |  |  |  |
Presentation of Income Statement Reclassifications [Line Items] |  |  |  |
Net Income (Loss) - Other |  |  | 2,583 | 7,458
Tax effect |  |  |  |
Presentation of Income Statement Reclassifications [Line Items] |  |  |  |
Provision for income taxes - Other | 6 | 11 | 11 | 22
Reclassification from accumulated other comprehensive income |  |  |  |
Presentation of Income Statement Reclassifications [Line Items] |  |  |  |
Cost of services | (55) | (112) | (110) | (223)
Net Income (Loss) - Other | (49) | (101) | (99) | (201)
Reclassification from accumulated other comprehensive income | Foreign Currency Translation Adjustment |  |  |  |
Presentation of Income Statement Reclassifications [Line Items] |  |  |  |
Sales Revenue Services Net | (1,011) | (4,883) | (3,538) | (10,215)
Reclassification from accumulated other comprehensive income | Derivative Valuation, Net of Tax |  |  |  |
Presentation of Income Statement Reclassifications [Line Items] |  |  |  |
Net income | (738) | (3,565) | (2,583) | (7,458)
Reclassification from accumulated other comprehensive income | Tax effect |  |  |  |
Presentation of Income Statement Reclassifications [Line Items] |  |  |  |
Benefit from (provision for) income taxes | $ 273 | $ 1,318 | $ 955 | $ 2,757

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