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Share-Based Compensation (Narrative) (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
item
$ / shares
shares
Jun. 30, 2019
USD ($)
Share-based compensation | $ $ 1,900 $ 3,500 $ 4,700 $ 6,500
Restricted Stock Units (RSUs) [Member]        
Share-based compensation shares granted     501,049  
Weighted average grant date fair value | $ / shares     $ 1.11  
Number of vesting equal annual installments | item     3  
Restricted Stock Units (RSUs) [Member] | Non-Employee Board Of Directors [Member]        
Share-based compensation vesting period     1 year  
Equivalent Stock Units (ESUs) [Member]        
Share-based compensation shares granted     3,001,168  
Weighted average grant date fair value | $ / shares     $ 1.09  
Number of vesting equal annual installments | item     3  
Performance Stock Unit Awards (PSUs) [Member]        
Share-based compensation award vesting period     3 years  
Performance Stock Unit Awards (PSUs) [Member] | Minimum [Member]        
Number of common stock shares issued for each PSU     0  
Performance Stock Unit Awards (PSUs) [Member] | Maximum [Member]        
Number of common stock shares issued for each PSU     2  
Performance Stock Unit Awards (PSUs) [Member] | 50th percentile relative TSR [Member]        
Share-based compensation arrangement performance obligations, percentage     65.00%  
Performance Stock Unit Awards (PSUs) [Member] | 90th percentile relative TSR [Member]        
Share-based compensation arrangement performance obligations, percentage     200.00%  
Performance Stock Unit Awards (PSUs) [Member] | Performance Period from January 1, 2020 to December 31, 2022 [Member]        
Share-based compensation shares granted     1,036,185  
Weighted average grant date fair value | $ / shares     $ 1.31