XML 82 R70.htm IDEA: XBRL DOCUMENT v3.21.2
Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Liability based restricted stock units transferred to equity $ 0.4 $ 1.8
Performance and Incentive Pay Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares available for grant 897,161  
Performance and Incentive Pay Plan | Restricted stock units | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 2 years  
Performance and Incentive Pay Plan | Restricted stock units | Minimum | Nonemployee    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 2 years  
Performance and Incentive Pay Plan | Restricted stock units | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 3 years  
Performance and Incentive Pay Plan | Restricted stock units | Maximum | Nonemployee    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 3 years  
Performance and Incentive Pay Plan | Performance shares | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 2 years  
Performance and Incentive Pay Plan | Performance shares | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 3 years