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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (INCOME STATEMENT CLASSIFICATION TABLE) (DETAILS) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Presentation of Income Statement Reclassifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales Revenue Services Net | $ 426,623 | $ 359,036 | $ 353,429 | $ 338,277 | $ 344,947 | $ 312,796 | $ 305,105 | $ 312,410 | $ 1,477,365 | $ 1,275,258 | $ 1,286,755
Interest Expense. |  |  |  |  |  |  |  |  | 13,734 | 7,943 | 7,538
Benefit from (provision for) income taxes | $ (69,016) | $ (2,071) | $ (1,597) | $ (5,391) | $ (6,196) | $ 813 | $ (2,952) | $ (4,528) | (78,075) | (12,863) | (20,004)
Net income |  |  |  |  |  |  |  |  | 10,812 | 37,435 | 65,885
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |
Presentation of Income Statement Reclassifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) - Other |  |  |  |  |  |  |  |  | 14,876 | 17,931 | (8,716)
Derivative Valuation, Net of Tax |  |  |  |  |  |  |  |  |  |  |
Presentation of Income Statement Reclassifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) - Other |  |  |  |  |  |  |  |  | 14,406 | 16,750 | (7,809)
Tax effect |  |  |  |  |  |  |  |  |  |  |
Presentation of Income Statement Reclassifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Provision for income taxes - Other |  |  |  |  |  |  |  |  | 52 | 129 | 101
Cost of Services |  |  |  |  |  |  |  |  |  |  |
Presentation of Income Statement Reclassifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of services |  |  |  |  |  |  |  |  | 522 | 1,310 | 1,008
Reclassification from accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Presentation of Income Statement Reclassifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) - Other |  |  |  |  |  |  |  |  | 470 | 1,181 | 907
Reclassification from accumulated other comprehensive income | Derivative Valuation, Net of Tax |  |  |  |  |  |  |  |  |  |  |
Presentation of Income Statement Reclassifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | (14,406) | (16,750) | (7,809)
Reclassification from accumulated other comprehensive income | Tax effect |  |  |  |  |  |  |  |  |  |  |
Presentation of Income Statement Reclassifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Benefit from (provision for) income taxes |  |  |  |  |  |  |  |  | (8,501) | (11,809) | (5,654)
Foreign Exchange Forward | Reclassification from accumulated other comprehensive income | Foreign Currency Translation Adjustment |  |  |  |  |  |  |  |  |  |  |
Presentation of Income Statement Reclassifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales Revenue Services Net |  |  |  |  |  |  |  |  | (22,792) | (28,025) | (12,410)
Interest Rate | Reclassification from accumulated other comprehensive income | Loss on interest rate swaps |  |  |  |  |  |  |  |  |  |  |
Presentation of Income Statement Reclassifications [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest Expense. |  |  |  |  |  |  |  |  | $ (115) | $ (534) | $ (1,053)

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