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FAIR VALUE (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Assets:    
Marketable Securities $ 136,704 $ 179,125
Fair Value, Measurements, Recurring [Member]    
Assets:    
Marketable Securities 136,704 179,125
Total assets 139,647 181,901
Liabilities:    
Contingent consideration 7,229 7,086
Deferred compensation 27,048 25,397
Total liabilities 46,255 41,919
Fair Value, Measurements, Recurring [Member] | Foreign exchange contracts    
Assets:    
Assets 2,943 2,776
Liabilities:    
Liabilities 3,585 4,351
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]    
Liabilities:    
Liabilities 8,393 5,085
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)    
Assets:    
Marketable Securities 0 0
Total assets 0 0
Liabilities:    
Contingent consideration 0 0
Deferred compensation 0 0
Total liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Foreign exchange contracts    
Assets:    
Assets 0 0
Liabilities:    
Liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Interest Rate Swap [Member]    
Liabilities:    
Liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)    
Assets:    
Marketable Securities 136,704 179,125
Total assets 139,647 181,901
Liabilities:    
Contingent consideration 0 0
Deferred compensation 27,048 25,397
Total liabilities 39,026 34,833
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts    
Assets:    
Assets 2,943 2,776
Liabilities:    
Liabilities 3,585 4,351
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Interest Rate Swap [Member]    
Liabilities:    
Liabilities 8,393 5,085
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)    
Assets:    
Marketable Securities 0 0
Total assets 0 0
Liabilities:    
Contingent consideration 7,229 7,086
Deferred compensation 0 0
Total liabilities 7,229 7,086
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Foreign exchange contracts    
Assets:    
Assets 0 0
Liabilities:    
Liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Interest Rate Swap [Member]    
Liabilities:    
Liabilities $ 0 $ 0