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STOCK-BASED COMPENSATION - Restricted stock and restricted stock unit, activity (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Weighted average grant date fair value      
Vested weighted average exercise price (in dollar per share)   $ 69.75  
Debt instrument, convertible, conversion ratio 0.4307    
Restricted Stock      
Number of shares (in thousands)      
Nonvested ending Balance (in shares) | shares 1,664 1,516 1,593
Granted (in shares) | shares 810 1,082 737
Vested (in shares) | shares (600) (724) (556)
Forfeited (in shares) | shares (80) (210) (258)
Converted (in shares) | shares 346    
Nonvested ending Balance (in shares) | shares 2,140 1,664 1,516
Weighted average grant date fair value      
Nonvested weighted average exercise price beginning balance (in dollar per share) $ 44.26 $ 42.97 $ 38.86
Granted the weighted average exercise price (in dollar per share) 33.94 41.66 51.70
Vested weighted average exercise price (in dollar per share) 44.85 36.81 42.25
Forfeited weighted average exercise price (in dollar per share) 40.20 44.82 44.51
Converted weighted average exercise price (in dollar per share) 39.54    
Nonvested weighted average exercise price beginning balance (in dollar per share) $ 39.58 $ 44.26 $ 42.97