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INCENTIVE PLANS - Stock Option Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Options (in shares):        
Outstanding, beginning balance (in shares) 166,650 762,225 1,138,813  
Canceled (in shares) 0 (11,365) 0  
Expired (in shares) 0 (449,916) (376,588)  
Exercised (in shares) 0 (134,294) 0  
Outstanding, ending balance (in shares) 166,650 166,650 762,225  
Exercisable, end of period (in shares) 166,650 166,650 762,225  
Weighted- average exercise price (in dollars per share):        
Outstanding, beginning balance (in dollars per share) $ 47.42 $ 101.84 $ 161.96  
Canceled (in dollars per share) 0 40.80 0  
Expired (in dollars per share) 0 142.30 283.63  
Exercised (in dollars per share) 0 39.00 0  
Outstanding, ending balance (in dollars per share) 47.42 47.42 101.84  
Intrinsic value per share (in dollars per share):        
Outstanding (in dollars per share) 14.24 32.47 0 $ 0
Exercised (in dollars per share) $ 0 $ 23.50 $ 0