XML 170 R155.htm IDEA: XBRL DOCUMENT v3.20.4
EMPLOYEE STOCK COMPENSATION - Summary of SARs Activity (Details) - Stock appreciation rights - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Shares      
Outstanding at beginning of year (in shares) 1,559,012 1,559,012 1,559,012
Outstanding at end of year (in shares) 1,559,012 1,559,012 1,559,012
Exercisable at end of year (in shares) 1,559,012 1,559,012 1,559,012
Weighted-Average Exercise Price per Share      
Outstanding at beginning of year (in dollars per share) $ 11.60 $ 11.60 $ 11.60
Outstanding at end of year (in dollars per share) 11.60 11.60 11.60
Exercisable at end of year (in dollars per share) $ 11.60 $ 11.60 $ 11.60