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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Presentation of Income Statement Reclassifications [Line Items]        
Sales Revenue Services Net $ 353,429 $ 305,105 $ 691,706 $ 617,515
Interest Expense. 2,912 1,753 5,230 3,717
Benefit from (provision for) income taxes (1,597) (2,952) (6,988) (7,480)
Net income 15,794 12,542 35,961 24,447
Accumulated Other Comprehensive Income (Loss)        
Presentation of Income Statement Reclassifications [Line Items]        
Net Income (Loss) - Other     7,340 7,414
Derivative Valuation, Net of Tax        
Presentation of Income Statement Reclassifications [Line Items]        
Net Income (Loss) - Other     7,105 7,010
Reclassification from accumulated other comprehensive income        
Presentation of Income Statement Reclassifications [Line Items]        
Net income     (7,105) (7,010)
Cost of services (130) (224) (261) (448)
Net Income (Loss) - Other (117) (202) (235) (404)
Reclassification from accumulated other comprehensive income | Derivative Valuation, Net of Tax        
Presentation of Income Statement Reclassifications [Line Items]        
Net income (2,969) (3,457)    
Reclassification from accumulated other comprehensive income | Tax effect        
Presentation of Income Statement Reclassifications [Line Items]        
Benefit from (provision for) income taxes 2,148 2,505 4,907 5,078
Provision for income taxes - Other 13 22 26 44
Foreign Exchange Forward | Reclassification from accumulated other comprehensive income        
Presentation of Income Statement Reclassifications [Line Items]        
Sales Revenue Services Net (5,091) (5,860) (11,897) (11,757)
Interest Rate | Reclassification from accumulated other comprehensive income | Loss on interest rate swaps [Member]        
Presentation of Income Statement Reclassifications [Line Items]        
Interest Expense. $ (26) $ (102) $ (115) $ (331)