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FAIR VALUE MEASUREMENTS (Contingent Consideration Roll Forward) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Acquisition date fair value of contractual contingent liabilities $ 0 $ 0 $ 1,924
Level 3      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Contractual contingent liabilities, beginning of period 5,364 40,623 0
Liability-classified stock-based awards 5,148 5,148 3,088
Changes in fair value of contractual contingent liabilities included in earnings 1,232 4,355 2,059
Changes in fair value of contractual contingent liabilities recorded against goodwill 200   1,366
Effect of net foreign currency exchange rate changes   246 (288)
Settlements of contractual contingent liabilities (8,955) (45,008)  
Reclassification of contractual contingent liabilities out of Level 3 (3,789)    
Contractual contingent liabilities, end of period 0 $ 5,364 40,623
Level 3 | Netsoft      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Acquisition date fair value of contractual contingent liabilities     1,825
Level 3 | Jointech      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Acquisition date fair value of contractual contingent liabilities     20,000
Level 3 | GGA      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Acquisition date fair value of contractual contingent liabilities     11,400
Level 3 | Great Fridays      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Acquisition date fair value of contractual contingent liabilities     $ 1,173
Level 3 | Other Acquisitions [Member]      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Acquisition date fair value of contractual contingent liabilities $ 800