Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION (Restricted Stock Narrative) (Details)

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STOCK-BASED COMPENSATION (Restricted Stock Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total fair market value of the shares issued upon vesting $ 22.6 $ 20.0 $ 11.5  
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 415,000 535,000 1,132,000  
Shares that will begin to vest on achieving minimum performance targets (in shares) 1,169,582 1,399,181 1,607,000 1,080,000
Restricted Stock [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting Period 1 year      
Restricted Stock [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting Period 5 years      
Non-Market Based or Performance Based Restricted Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 200,000 300,000 900,000  
Non-Market Based or Performance Based Restricted Stock Awards [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting Period 1 year 1 year 1 year  
Non-Market Based or Performance Based Restricted Stock Awards [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting Period 4 years 4 years 4 years  
Restricted Stock Performance Based Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting Period 2 years      
Granted (in shares) 200,000 200,000 200,000  
Shares that will begin to vest on achieving minimum performance targets (in shares) 200,000      
Restricted Stock Performance Based Awards [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting Period   1 year 1 year  
Restricted Stock Performance Based Awards [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting Period   2 years 2 years