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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Presentation of Income Statement Reclassifications [Line Items]                      
Sales Revenue Services Net $ 341,816 $ 309,195 $ 310,223 $ 325,521 $ 338,170 $ 305,900 $ 295,490 $ 302,221 $ 1,286,755 $ 1,241,781 $ 1,193,157
Interest Expense.                 7,538 6,946 7,513
Provision for income taxes $ 6,566 $ 1,192 $ 7,841 $ 4,405 $ 8,971 $ 5,778 $ 5,417 $ 2,876 20,004 23,042 20,598
Net Income (Loss)                 65,885 77,417 71,471
Net Income (Loss) - Other                 8,716 3,160 (3,621)
Derivative Valuation, Net of Tax                      
Presentation of Income Statement Reclassifications [Line Items]                      
Net Income (Loss) - Other                 7,809 2,128 (4,190)
Tax effect                      
Presentation of Income Statement Reclassifications [Line Items]                      
Provision for income taxes - Other                 101 66 36
Cost of Services                      
Presentation of Income Statement Reclassifications [Line Items]                      
Cost of services                 (1,008) (1,098) (605)
Reclassification from accumulated other comprehensive income                      
Presentation of Income Statement Reclassifications [Line Items]                      
Net Income (Loss) - Other                 (907) (1,032) (569)
Reclassification from accumulated other comprehensive income | Derivative Valuation, Net of Tax                      
Presentation of Income Statement Reclassifications [Line Items]                      
Net Income (Loss)                 (7,809) (2,128) 4,190
Reclassification from accumulated other comprehensive income | Tax effect                      
Presentation of Income Statement Reclassifications [Line Items]                      
Provision for income taxes                 5,654 1,361 (2,736)
Foreign Exchange Forward | Reclassification from accumulated other comprehensive income | Foreign Currency Translation Adjustment                      
Presentation of Income Statement Reclassifications [Line Items]                      
Sales Revenue Services Net                 (12,410) (2,429) 7,973
Interest Rate | Reclassification from accumulated other comprehensive income | Loss on interest rate swaps [Member]                      
Presentation of Income Statement Reclassifications [Line Items]                      
Interest Expense.                 $ (1,053) $ (1,060) $ (1,047)