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STOCK-BASED COMPENSATION - Liability-Classified Stock Compensation Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2009
Shares        
Outstanding (in shares) 0      
Outstanding (in shares) 0 0    
2001 Stock Option Plan        
Stock-based compensation        
Shares eligible for issuance       500,000
2001 Stock Option Plan | Stock Option Awards        
Stock-based compensation        
Awards available for issue ( in shares)       0
Remaining liability $ 0 $ 0    
Shares        
Outstanding (in shares) 0   11,000  
Exercised (in shares)     (6,000)  
Expired (in shares)     (5,000)  
Outstanding (in shares) 0 0    
Exercisable (in shares) 0      
Weighted Average Fair Value        
Outstanding (in dollars per share)     $ 63.87  
Exercised (in dollars per share)     52.73  
Expired (in dollars per share)     $ 52.73  
2001 Stock Option Plan | Stock Appreciation Rights        
Shares        
Outstanding (in shares) 0      
Outstanding (in shares) 0 0    
Exercisable (in shares) 0 0    
Shares        
Outstanding (in shares)     11,000  
Exercised (in shares)     (6,000)  
Expired (in shares)     (5,000)  
Weighted Average Fair Value        
Outstanding (in dollars per share)     $ 1.33  
Exercised (in dollars per share)     $ 3.84