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Share-Based Arrangements (Stock Incentive Plan) (Details)
12 Months Ended
Dec. 31, 2020
shares
Dec. 31, 2019
shares
Apr. 18, 2018
shares
Apr. 17, 2013
shares
Share-based Compensation Arrangement by Share-based Payment Award        
Number of shares authorized under the plan for each award issued, fair value awards 3      
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award        
Award vesting rate 0.20      
Share-based payment award, vesting period 5 years      
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award        
Award vesting rate 0.20      
Share-based payment award, vesting period 5 years      
2013 Management Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award        
Number of shares authorized (in shares)     2,250,000 2,250,000
Number of shares available for grant (in shares) 1,845,019      
2013 Management Incentive Plan [Member] | LTIP Awards        
Share-based Compensation Arrangement by Share-based Payment Award        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 100.00%      
Minimum [Member] | 2013 Management Incentive Plan [Member] | LTIP Awards        
Share-based Compensation Arrangement by Share-based Payment Award        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 0.00%      
Maximum [Member] | 2013 Management Incentive Plan [Member] | LTIP Awards        
Share-based Compensation Arrangement by Share-based Payment Award        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 200.00%      
2016 Grant [Member] | 2013 Management Incentive Plan [Member] | Performance-based and Market-based Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   130.00%    
Granted (in shares)   925