Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Narrative (Details)

v3.21.2
Share-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
RSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares) 0 6,000   636,000 562,000  
TSR, maximum percent of performance period 5.00%     5.00%    
Vested (in shares) 2,000 14,000   207,000 120,000  
Grant date fair value $ 100 $ 100   $ 7,900 $ 1,400  
Unrecognized compensation costs 25,400     $ 25,400    
Period for recognition (in years)       2 years 2 months 12 days    
Performance-based Equity Awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vested (in shares)       0    
Grant date fair value $ 0       $ 3,400  
Performance-based Equity Awards | Vesting Percentage, Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting rights     0.00%      
Performance-based Equity Awards | Vesting Percentage, Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting rights     300.00%      
Cash-Settled RSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares) 0 0   3,000 125,000  
Vested (in shares) 0 1,000   1,000 3,000  
Unrecognized compensation costs $ 3,700     $ 3,700    
Period for recognition (in years)       1 year 2 months 12 days    
Award vesting period (in years)       3 years    
Cash Stock Appreciation Rights (SARs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation costs $ 8,200     $ 8,200   $ 1,700