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Common Stock (Restricted Stock and Units) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restricted Stock, Time-vesting      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period in years 3 years    
Percentage by award type 63.00%    
Restricted Stock, Performance-based      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage by award type 37.00%    
Restricted Stock      
Shares      
Non-vested at beginning of period (in shares) 1,050,372    
Granted to employees (in shares) 1,494,022    
Vested (in shares) (615,941)    
Forfeited (in shares) (299,433)    
Non-vested at end of period (in shares) 1,629,020 1,050,372  
Weighted-Average Fair Value - Date of Grant (in dollars per share)      
Non-vested at beginning of period (in dollars per share) $ 3.47    
Forfeited (in dollars per share) 3.16    
Vested (in dollars per share) 3.72    
Granted to employees (in dollars per share) 2.62 $ 10.62 $ 11.92
Non-vested at end of period (in dollars per share) $ 2.66 $ 3.47  
Fair value of vested restricted stock $ 6.3 $ 8.6 $ 15.4
Award unrecognized compensation expense $ 1.8    
Award unrecognized compensation expense, expected period for recognition 2 years    
Restricted Stock Units (RSUs)      
Shares      
Non-vested at beginning of period (in shares) 301,766    
Vested (in shares) (29,720)    
Non-vested at end of period (in shares) 1,038,474 301,766  
Weighted-Average Fair Value - Date of Grant (in dollars per share)      
Non-vested at beginning of period (in dollars per share) $ 3.94    
Vested (in dollars per share) 0    
Non-vested at end of period (in dollars per share) $ 3.24 $ 3.94  
Award unrecognized compensation expense, expected period for recognition 1 year 3 months 18 days    
Awards granted (in shares) 1,071,530 604,682  
2018 | Restricted Stock Units (RSUs)      
Shares      
Forfeited (in shares) (272,046)    
Weighted-Average Fair Value - Date of Grant (in dollars per share)      
Forfeited (in dollars per share) $ 6.39    
2019 | Restricted Stock Units (RSUs)      
Shares      
Granted to employees (in shares) 1,071,530    
Forfeited (in shares) (62,776)    
Weighted-Average Fair Value - Date of Grant (in dollars per share)      
Forfeited (in dollars per share) $ 1.66    
Granted to employees (in dollars per share) $ 3.75