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Share-Based Compensation - Restricted Stock and Performance Unit Share Activity (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Free Share Award      
Free Share Activity and Other Data, Nonvested [Roll Forward]      
Outstanding, beginning balance (in shares) 347    
Granted (in shares) 186    
Vested (in shares) (115)    
Forfeited (in shares) (71)    
Outstanding, ending balance (in shares) 347 347  
Free Share Activity and Other Data, Weighted Average Grant Date Fair Value [Abstract]      
Nonvested free share award, beginning balance (in usd per share) $ 4.73    
Granted (in usd per share) 7.69 $ 2.47 $ 5.87
Vested (in usd per share) 6.01    
Forfeited (in usd per share) 4.83    
Nonvested free share award, ending balance (in usd per share) $ 5.87 $ 4.73  
Performance Shares      
Free Share Activity and Other Data, Nonvested [Roll Forward]      
Outstanding, beginning balance (in shares) 0    
Granted (in shares) 257    
Vested (in shares) 0    
Forfeited (in shares) 0    
Outstanding, ending balance (in shares) 257 0  
Free Share Activity and Other Data, Weighted Average Grant Date Fair Value [Abstract]      
Nonvested free share award, beginning balance (in usd per share) $ 0    
Granted (in usd per share) 7.09    
Vested (in usd per share) 0    
Forfeited (in usd per share) 0    
Nonvested free share award, ending balance (in usd per share) $ 7.09 $ 0