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SHAREHOLDERS' EQUITY - Changes in Shareholder's Equity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
December 31, 2017 $ 1,040,815  
Net income 35,981 $ 27,890
Foreign currency translation adjustments 6,225 4,548
Derivative instrument adjustment 19 $ (307)
Amounts related to share-based compensation (4,586)  
Repurchase of common stock (1,882)  
Dividends (10,668)  
Employee stock plan issuance 326  
March 31, 2018 1,066,230  
Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
December 31, 2017 369  
Amounts related to share-based compensation 1  
March 31, 2018 370  
Treasury Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
December 31, 2017 (694,233)  
Repurchase of common stock (1,882)  
Employee stock plan issuance 171  
March 31, 2018 (695,944)  
Additional Paid-In Capital    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
December 31, 2017 1,188,538  
Amounts related to share-based compensation (4,587)  
Employee stock plan issuance 155  
March 31, 2018 1,184,106  
Accumulated Other Comprehensive Income    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
December 31, 2017 16,745  
Foreign currency translation adjustments 6,225  
Derivative instrument adjustment 19  
March 31, 2018 22,989  
Retained Earnings    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
December 31, 2017 529,396  
Net income 35,981  
Dividends (10,668)  
March 31, 2018 $ 554,709