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STOCK-BASED COMPENSATION PLANS (Details)
3 Months Ended 9 Months Ended
Sep. 01, 2019
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
installment
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
Nov. 20, 2019
$ / shares
Oct. 10, 2019
$ / shares
Oct. 09, 2019
shares
Jun. 30, 2019
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Jun. 30, 2018
$ / shares
Dec. 31, 2017
$ / shares
STOCK-BASED COMPENSATION PLANS                        
Special dividend per share | $ / shares           $ 9.43 $ 9.43          
Performance Shares                        
STOCK-BASED COMPENSATION PLANS                        
Granted (in units)   110,160 110,160                
Granted (in dollars per unit) | $ / shares   $ 25.75 $ 25.75                
Stock appreciation rights plan liability recorded for the outstanding units | $   $ 0   $ 0           $ 1,884,000    
Compensation expense (benefit) | $   64,000 $ 482,000 (51,000) $ 540,000              
Unrecognized compensation cost related to non-vested stock-based compensation agreements | $   0   0           0    
Stock appreciation rights plan liability recorded for the previously exercised units | $   $ 1,674,000   $ 1,674,000           $ 176,000    
Number of equal annual instalments in which the liability recorded for previously exercised units will be paid | installment       5                
Outstanding (in dollars per unit) | $ / shares   $ 25.75 $ 5.73 $ 25.75 $ 5.73 $ 16.32     $ 7.46 $ 5.73 $ 5.73 $ 5.66
Performance Shares | Key employees                        
STOCK-BASED COMPENSATION PLANS                        
Granted (in units) 110,160                      
Granted (in dollars per unit) | $ / shares $ 25.75                      
Fully vested on grant date 79,560                      
Vest ratable (in units) 30,600                      
Vesting period 4 years                      
Omnibus Incentive Plan                        
STOCK-BASED COMPENSATION PLANS                        
Authorized number of shares               1,820,000