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Incentive Compensation Plan Incentive Compensation Plan - Restricted Stock Awards Estimated to be Granted on a Performance Award (Details) - $ / shares
12 Months Ended
Feb. 20, 2020
Feb. 21, 2019
Nov. 26, 2018
May 29, 2018
Mar. 26, 2018
Feb. 28, 2018
Feb. 26, 2018
Feb. 23, 2017
Dec. 19, 2016
Sep. 30, 2016
Sep. 19, 2016
Jun. 07, 2016
Mar. 01, 2016
Mar. 01, 2016
Feb. 18, 2016
Dec. 30, 2015
Jun. 26, 2015
Feb. 05, 2015
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Target Award Participants Earn 40.00% 40.00%       40.00%   40.00%             40.00%            
Performance Shares Awards As Percentage Of Target 100.00% 100.00%       100.00%   100.00%             100.00%            
Percentage Of Target Award Opportunities Maximum In Certain Cases 200.00% 200.00%       200.00%   200.00%             200.00%            
Vesting period of restricted stock 0 years 0 years       0 years   0 years             0 years 0 years          
Performance Based Stock Awards Vesting Period 3 years 3 years       3 years   3 years             3 years 5 years          
Grant Price (in dollars per share)                                     $ 13.72 $ 14.22 $ 14.50
Restricted Stock [Member]                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Vesting period of restricted stock   1 year 1 year 1 year 1 year   1 year   3 years 1 year 3 years 1 year 1 year 1 year     1 year        
Common stock issued to executive   15,000 2,000 3,000 2,000   77,500   15,000 10,000 33,000 10,000 5,000 10,000     1,000        
Grant Price (in dollars per share)   $ 14.22 $ 13.82 $ 15.44 $ 14.08   $ 14.49   $ 13.96 $ 10.09 $ 10.02 $ 9.34 $ 8.84 $ 8.84   $ 9.18 $ 9.84        
Vesting Date   Feb. 22, 2022 Nov. 26, 2021 May 29, 2021 Mar. 26, 2021   Feb. 26, 2021   Dec. 19, 2019 Sep. 30, 2019 Sep. 19, 2019 Jun. 07, 2019 Mar. 01, 2019 Mar. 01, 2019     Jun. 26, 2018        
Restricted Stock [Member] | Long Term Incentive Plan [Member]                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Vesting period of restricted stock                                   1 year      
Common stock issued to executive                                   50,000      
Grant Price (in dollars per share)                                   $ 8.55      
Vesting Date                                   Feb. 05, 2018      
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member]                                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Common stock issued to executive 188,700,000 121,900,000       102,000,000   93,500,000             160,650,000 60,000,000