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Stock-Based Compensation - Performance Shares Activity (Details) - Performance shares - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares outstanding (in shares) 1,214,145 1,538,315 2,368,281 2,372,632
Shares outstanding, Weighted Average Grant Date Fair Value (in dollars per share) $ 6.93 $ 4.05 $ 4.44 $ 4.53
Granted (in shares) 946,000 869,421 316,213  
Grant date fair value of restricted stock $ 4.71 $ 7.41 $ 11.58  
Vested (in shares) (969,903) (1,086,058) (66,696)  
Vested (in dollars per share) $ 1.77 $ 6.83 $ 14.18  
Canceled/Forfeited (in shares) (300,267) (613,329) (253,868)  
Canceled/Forfeited (in dollars per share) $ 1.84 $ 5.41 $ 11.56