Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation (Narrative) (Details)

v3.20.4
Share-Based Compensation (Narrative) (Details)
$ in Thousands
12 Months Ended
Aug. 07, 2020
May 10, 2018
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 20, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock split, conversion ratio 0.1          
Number of shares available for grant (in shares) | shares     2,002,463      
Payments to settle vested liability share-based awards     $ 770 $ 1,425 $ 4,990  
RSU equity awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Fair value of shares vested     1,600 $ 7,300 $ 6,300  
Unrecognized compensation cost related to unvested awards     $ 13,500      
Weighted average period over which expense is expected to be recognized     1 year 8 months 12 days      
Vested in period (in shares) | shares     132,000 106,000 51,000  
TSR, maximum percent of performance period     5.00%      
RSU equity awards | Vesting Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation arrangement vesting rights, percentage     0.00% 0.00% 0.00%  
RSU equity awards | Vesting Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation arrangement vesting rights, percentage     300.00% 200.00% 200.00%  
Performance-based RSU            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Fair value of shares vested     $ 3,400 $ 4,300 $ 3,500  
Cash-settleable RSU awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost related to unvested awards     $ 1,500      
Weighted average period over which expense is expected to be recognized     1 year 10 months 24 days      
Vested in period (in shares) | shares     16,000 16,000 28,000  
Market-based Cash-settleable RSUs Awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Cash-settleable restricted stock unit awards     $ 200   $ 3,200  
Market-based Cash-settleable RSUs Awards | Vested at between 100% to 163%            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Payments to settle vested liability share-based awards     800      
Cash-settled SARs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Fair value of shares vested     4,600      
Unrecognized compensation cost related to unvested awards     $ 1,700 $ 5,000    
Carrizo            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exchange ratio (in shares)     1.75     1.75
2018 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized (in shares) | shares   9,400,000 10,722,742      
Increase (decrease) in shares | shares   1,322,742