Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION (Narrative) (Details)

v3.19.2
STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation cost $ 2.8 $ 3.3 $ 5.6 $ 6.0
Capitalized stock-based compensation cost 1.1 $ 1.3 2.3 $ 2.4
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense 13.8   $ 13.8  
Weighted average period of expense recognition period     1 year 10 months 24 days  
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense $ 1.9   $ 1.9  
Weighted average period of expense recognition period     2 years 6 months 3 days  
Performance period     36 months  
Expected performance period     3 years  
Risk-free interest rate     2.42%  
Range of expected volatility, minimum     30.50%  
Range of expected volatility, maximum     72.60%  
Minimum | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     1 year  
Maximum | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years