XML 58 R57.htm IDEA: XBRL DOCUMENT v3.20.1
Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Outstanding at beginning of period (in shares) 963,832 969,928 969,928  
Granted (in shares) 435,254 276,496    
Converted (in shares) (128,463) (130,764)    
Expired (in shares) (1,000) 0    
Forfeited (in shares) 0 0    
Outstanding at end of period (in shares) 1,269,623 1,115,660 963,832 969,928
Vested (in shares) 353,023 337,060    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Outstanding at beginning of period, Weighted average grant-date fair value (in dollars per share) $ 17.67 $ 15.89 $ 15.89  
Granted, Weighted average grant-date fair value (in dollars per share) 18.86 23.24    
Converted, Weighted average grant-date fair value (in dollars per share) 19.06 16.74    
Expired, Weighted average grant-date fair value (in dollars per share) 19.40 0    
Forfeited, Weighted average grant-date fair value (in dollars per share) 0 0    
Outstanding at end of period, Weighted average grant-date fair value (in dollars per share) 17.94 17.61 $ 17.67 $ 15.89
Vested (in dollars per share) $ 8.25 $ 8.04    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Share-based compensation expense $ 1.8 $ 1.5    
Unrecognized share-based compensation expense $ 13.5      
Unrecognized share-based compensation, weighted average recognition period 1 year 9 months 18 days      
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Requisite service period 3 years      
Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Requisite service period 3 years      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Historical volatility period 3 years   3 years  
Risk-free interest rate 0.70%      
Expected volatility rate 35.00%      
Market Condition Award [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Granted, Weighted average grant-date fair value (in dollars per share) $ 20.41      
Performance Condition Award [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Granted, Weighted average grant-date fair value (in dollars per share) $ 18.39      
Time-Based Awards [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Number of additional outstanding shares issued (in shares) 1,570,298      
Director [Member] | Time-Based Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Vested (in shares) 353,023      
Director [Member] | Time-Based Awards [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Requisite service period       6 months
Director [Member] | Time-Based Awards [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Requisite service period 12 months