Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION (Narrative) (Details)

v3.19.3.a.u2
STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation cost $ 2.7 $ 3.6 $ 8.3 $ 9.7
Capitalized stock-based compensation cost 1.1 $ 1.4 $ 3.3 $ 3.9
Percent of target based award, minimum     0.00%  
Percent of target based award, maximum     200.00%  
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense 19.0   $ 19.0  
Weighted average period of expense recognition period     2 years 3 months 10 days  
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense $ 4.9   $ 4.9  
Weighted average period of expense recognition period     2 years 7 months 20 days  
Expected performance period     2 years  
Risk free interest rate, minimum     1.56%  
Risk free interest rate, maximum     2.42%  
Range of expected volatility, minimum     29.10%  
Range of expected volatility, maximum     85.10%  
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