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Share-Based Arrangements (Stock Incentive Plan) (Details)
12 Months Ended
Dec. 31, 2018
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      
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) 2,482,935    
2013 Management Incentive Plan | LTIP Awards      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting percentage 100.00%    
Minimum | 2013 Management Incentive Plan | LTIP Awards      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting percentage 0.00%    
Maximum | 2013 Management Incentive Plan | LTIP Awards      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting percentage 200.00%    
2014 Grant [Member] | 2013 Management Incentive Plan | Performance- and Market-based Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting percentage 139.90%    
Granted (in shares) 1,506    
2015 Grant [Member] | 2013 Management Incentive Plan | Performance- and Market-based Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting percentage 142.30%    
Granted (in shares) 1,573    
2016 Grant [Member] | 2013 Management Incentive Plan | Performance- and Market-based Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting percentage 100.00%    
Granted (in shares) 1,060