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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (INCOME STATEMENT CLASSIFICATION TABLE) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Presentation of Income Statement Reclassifications [Line Items] |  |
Revenues | $ 394,356 | $ 375,249
Interest Expense. | 5,288 | 6,459
Benefit from (provision for) income taxes | (7,466) | (2,102)
Net income | 20,476 | 5,932
Accumulated Other Comprehensive Income (Loss) |  |
Presentation of Income Statement Reclassifications [Line Items] |  |
Net Income (Loss) - Other | 1,894 | 3,994
Derivative Valuation, Net of Tax |  |
Presentation of Income Statement Reclassifications [Line Items] |  |
Net Income (Loss) - Other | 1,845 | 3,893
Tax effect |  |
Presentation of Income Statement Reclassifications [Line Items] |  |
Provision for income taxes - Other | 6 | 11
Reclassification from accumulated other comprehensive income |  |
Presentation of Income Statement Reclassifications [Line Items] |  |
Cost of services | (55) | (112)
Net Income (Loss) - Other | (49) | (101)
Reclassification from accumulated other comprehensive income | Foreign Currency Translation Adjustment |  |
Presentation of Income Statement Reclassifications [Line Items] |  |
Revenues | (2,527) | (5,332)
Reclassification from accumulated other comprehensive income | Derivative Valuation, Net of Tax |  |
Presentation of Income Statement Reclassifications [Line Items] |  |
Net income | (1,845) | (3,893)
Reclassification from accumulated other comprehensive income | Tax effect |  |
Presentation of Income Statement Reclassifications [Line Items] |  |
Benefit from (provision for) income taxes | $ 682 | $ 1,439

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