XML 105 R71.htm IDEA: XBRL DOCUMENT v3.20.4
Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 07, 2018
Mar. 06, 2018
Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted awards (in shares) 0 37,235      
Unrecognized compensation costs related to unvested options $ 0.6        
Restricted Stock Units | Executive Officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   3 years      
Restricted Stock Units | Executive Officer | Tranche 1          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted awards (in shares)     48,663    
Restricted Stock Units | Executive Officer | Tranche 1 | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
Restricted Stock Units | Executive Officer | Tranche 2          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted awards (in shares)     8,426    
Restricted Stock Units | Executive Officer | Tranche 2 | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     5 years    
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum number of shares of common stock available for awards (in shares) 181,504 227,478      
Granted awards (in shares) 96,056 125,232 100,715    
Share-based compensation arrangement by share-based payment award percentage of target achieved 95.00%        
Reversed of expense related to 2019 PSU’s $ 1.4        
Performance Shares | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation costs related to unvested options $ 14.1 $ 14.1      
Long-term incentive plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum number of shares of common stock available for awards (in shares)       3,775,000 2,975,000
Shares remaining available for grant (in shares) 647,903