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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Presentation of Income Statement Reclassifications [Line Items] |  |  |  |
Sales Revenue Services Net | $ 349,853 | $ 353,429 | $ 725,102 | $ 691,706
Interest Expense. | 7,765 | 2,912 | 14,224 | 5,230
Benefit from (provision for) income taxes | (653) | (1,597) | (2,755) | (6,988)
Net income | $ 6,297 | $ 15,794 | 12,229 | 35,961
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Presentation of Income Statement Reclassifications [Line Items] |  |  |  |
Net Income (Loss) - Other |  |  | 7,659 | 7,340
Derivative Valuation, Net of Tax |  |  |  |
Presentation of Income Statement Reclassifications [Line Items] |  |  |  |
Net Income (Loss) - Other |  |  | $ 7,458 | $ 7,105

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