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Stock Based Compensation - Non-vested Restricted Stock, PSU and RSU Award Activity (Details) - $ / shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Restricted Stock    
Number of Non-vested Restricted Shares    
Non-vested shares at beginning of period (in shares) 1,603,766 837,123
Granted (in shares) 939,446 1,054,254
Vested (in shares) 538,243 287,611
Forfeited (in shares) (9,997) 0
Non-vested shares at end of period (in shares) 1,994,972 1,603,766
Weighted Average Per Share Grant Date Fair Value    
Non-vested shares at beginning of period (in dollars per share) $ 6.27 $ 6.18
Granted (in dollars per share) 3.82 6.33
Vested (in dollars per share) 6.24 6.22
Forfeited (in dollars per share) 6.33 0
Non-vested shares at end of period (in dollars per share) $ 5.12 $ 6.27
PSUs    
Number of Non-vested Restricted Shares    
Non-vested shares at beginning of period (in shares) 2,902,014 2,018,518
Granted (in shares) 1,563,910 883,496
Vested (in shares) (842,792) 0
Vested (in shares) 974,074  
Non-vested shares at end of period (in shares) 3,623,132 2,902,014
Weighted Average Per Share Grant Date Fair Value    
Non-vested shares at beginning of period (in dollars per share) $ 4.98 $ 4.09
Granted (in dollars per share) 5.49 7.03
Vested (in dollars per share) 4.20 0
Non-vested shares at end of period (in dollars per share) $ 5.38 $ 4.98
RSUs    
Number of Non-vested Restricted Shares    
Non-vested shares at beginning of period (in shares) 441,746 0
Granted (in shares) 781,955 441,746
Vested (in shares) 147,254 0
Non-vested shares at end of period (in shares) 1,076,447 441,746
Weighted Average Per Share Grant Date Fair Value    
Non-vested shares at beginning of period (in dollars per share) $ 6.23 $ 0
Granted (in dollars per share) 3.69 6.23
Vested (in dollars per share) 6.23 0
Non-vested shares at end of period (in dollars per share) $ 4.38 $ 6.23