Quarterly report pursuant to Section 13 or 15(d)

Share-based Compensation (Narrative) (Details)

v3.20.2
Share-based Compensation (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
TSR, maximum percent of performance period 5.00%     5.00%  
Vested (in shares) (14,000) (17,000)   (120,000) (96,000)
Grant date fair value $ 100,000 $ 800,000   $ 1,400,000 $ 6,800,000
Unrecognized compensation costs 16,400,000     $ 16,400,000  
Period for recognition       1 year 10 months 24 days  
RSUs | Vesting Percentage, Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights       0.00% 0.00%
RSUs | Vesting Percentage, Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights       300.00% 200.00%
Performance-based Equity Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vested (in shares)       0  
Grant date fair value $ 0 $ 0   $ 3,400,000 $ 4,300,000
Performance-based Equity Awards | Vesting Percentage, Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights 0.00%   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%   200.00%    
Cash-Settled RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vested (in shares) (1,000) 0   (3,000) (2,000)
Unrecognized compensation costs $ 500,000     $ 500,000  
Period for recognition       2 years  
Award vesting period       3 years  
2020 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares of common stock available for grant (in shares) 1,967,782     1,967,782