Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation (Narrative) (Details)

v3.19.3.a.u2
Share-Based Compensation (Narrative) (Details)
$ in Thousands
12 Months Ended
May 10, 2018
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 20, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Payments to settle vested liability share-based awards   $ 1,425 $ 4,990 $ 13,173  
RSU equity awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement vesting rights, percentage       142.00%  
Fair value of shares vested   7,300 $ 6,300 $ 9,000  
Unrecognized compensation cost related to unvested awards   $ 15,100      
Weighted average period over which expense is expected to be recognized   1 year 3 months 18 days      
Vested in period (in shares) | shares   1,062,000 506,000 797,000  
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%      
RSU equity awards | Vesting Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement vesting rights, percentage   200.00%      
Performance-based RSU          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Fair value of shares vested   $ 4,300 $ 3,500 $ 2,600  
Cash-settleable RSU awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to unvested awards   $ 1,100      
Weighted average period over which expense is expected to be recognized   1 year 6 months      
Vested in period (in shares) | shares   164,000 276,000 379,000  
Cash-settleable RSU awards | Vesting Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement vesting rights, percentage   0.00%      
Cash-settleable RSU awards | Vesting Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement vesting rights, percentage   200.00%      
Market-based Cash-settleable RSUs Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement vesting rights, percentage   100.00%      
Vested in period (in shares) | shares   147,492 207,261    
Cash-settleable restricted stock unit awards   $ 700      
Market-based Cash-settleable RSUs Awards | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement vesting rights, percentage     100.00%    
Market-based Cash-settleable RSUs Awards | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement vesting rights, percentage     163.00%    
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   $ 1,300 $ 100    
Non-Market Based Cash-settleable RSU Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vested in period (in shares) | shares   16,600 129,753    
Payments to settle vested liability share-based awards   $ 100 $ 1,800    
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   $ 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        
Number of shares available for grant (in shares) | shares   13,814,216