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Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Long-Term Incentive Plans [Abstract]  
Restricted Shares Outstanding
                                                 
 
Restricted Share Activity
 
 
2019
   
2018
   
2017
 
 
Number of
Shares
 
  
Weighted
Average Price
Per Share
 
  
Number of
Shares
 
  
Weighted
Average Price
Per Share
 
  
Number of
Shares
 
  
Weighted
Average Price
Per Share
 
Outstanding at beginning of year
   
5,044,616
    $
 9.7986
     
2,392,978
    $
9.6142
     
3,916,661
    $
9.3553
 
Granted
   
711,176
     
11.4185
     
3,668,801
     
9.9711
     
708,529
     
9.3740
 
Vested
   
(416,676
 )    
9.0332
     
(267,163
 )    
10.0705
     
(1,051,657
 )    
9.9732
 
Forfeited
   
(192,288
 )    
9.4917
     
(750,000
 )    
9.9576
     
(1,180,555
 )    
8.2912
 
                                                 
Outstanding at end of year
   
5,146,828
    $
 10.0958
     
5,044,616
    $
9.7986
     
2,392,978
    $
9.6142