Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION (Narrative) (Details)

v3.19.1
STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation cost $ 2.8 $ 2.7
Capitalized stock-based compensation cost $ 1.1  
Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted average period of expense recognition period 2 years 1 month 2 days  
Unrecognized compensation expense $ 14.8  
Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 36 months  
Weighted average period of expense recognition period 2 years 9 months 4 days  
Performance period 3 years  
Risk-free interest rate 2.42%  
Range of expected volatility, minimum 30.50%  
Range of expected volatility, maximum 72.60%  
Unrecognized compensation expense $ 2.2  
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