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SHAREHOLDERS' EQUITY - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jul. 25, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]              
Number of shares repurchased and retired (shares)   513,116 1,603,248 1,808,398 1,612,174    
Cost of shares repurchased, including commissions   $ 71,999 $ 179,917 $ 229,995 $ 180,897    
Average cost per share (USD per share)   $ 140.32 $ 112.20 $ 127.18 $ 112.19    
Dividends declared (USD per share)       $ 0.01      
Common stock authorized (shares)   200,000,000   200,000,000     200,000,000
Forecast              
Class of Stock [Line Items]              
Common stock authorized (shares)           400,000,000  
Subsequent Event              
Class of Stock [Line Items]              
Dividends declared (USD per share) $ 0.01            
Other than accelerated share repurchase program              
Class of Stock [Line Items]              
Remaining authorized repurchase amount (up to)   $ 566,000   $ 566,000