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Stock-Based Compensation - Performance Shares Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Unrecognized stock-based compensation cost $ 8.7      
Unrecognized stock-based compensation cost, weighted-average period recognized 1 year 7 months 6 days      
Performance shares        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]        
Shares outstanding (in shares) 2,335,102 1,214,145 1,538,315 2,368,281
Granted (in shares) 1,343,953 946,000 869,421  
Vested (in shares) (54,132) (969,903) (1,086,058)  
Canceled/Forfeited (in shares) (168,864) (300,267) (613,329)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Shares outstanding, Weighted Average Grant Date Fair Value, beginning balance (in dollars per share) $ 6.93 $ 4.05 $ 4.44  
Grant date fair value of restricted stock 3.95 4.71 7.41  
Vested (in dollars per share) 11.47 1.77 6.83  
Canceled/Forfeited (in dollars per share) 10.71 1.84 5.41  
Shares outstanding, Weighted Average Grant Date Fair Value, ending balance (in dollars per share) $ 4.83 $ 6.93 $ 4.05  
Unrecognized stock-based compensation cost $ 4.3      
Unrecognized stock-based compensation cost, weighted-average period recognized 1 year 10 months 24 days      
Performance shares | 2015 Award [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]        
Granted (in shares)     461,242  
Performance shares | 2016 Award [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]        
Granted (in shares)   207,264    
Canceled/Forfeited (in shares)   (300,267)    
Performance shares | 2017 Award [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]        
Granted (in shares) 6,226      
Canceled/Forfeited (in shares) (143,808)