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FAIR VALUE MEASUREMENTS (Contractual Contingent Liabilities Roll Forward) (Details) - Level 3 - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Contractual contingent liabilities, beginning of period $ 0 $ 5,364 $ 40,623
Liability-classified stock-based awards   5,148 5,148
Changes in fair value of contractual contingent liabilities included in earnings   1,232 4,355
Changes in fair value of contractual contingent liabilities recorded against goodwill 200    
Settlements of contractual contingent liabilities   (8,955) (45,008)
Effect of net foreign currency exchange rate changes     246
Reclassification of contractual contingent liabilities out of Level 3   (3,789)  
Increase/(decrease) in contractual contingent liabilities 0    
Contractual contingent liabilities, end of period $ 0 $ 0 5,364
Other Acquisitions      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Acquisition date fair value of contractual contingent liabilities — other acquisitions     $ 800