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Share-Based Compensation Plan (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Feb. 14, 2018
Feb. 15, 2017
Feb. 10, 2016
Jul. 27, 2015
Feb. 11, 2015
Feb. 04, 2014
Dec. 13, 2013
Jan. 30, 2013
Mar. 31, 2018
Restricted Stock [Member]                  
Summary of restricted share activity                  
Unvested shares, Beginning balance                 137,105
Unvested shares, Granted                 52,609
Vested, shares                 (61,982)
Forfeited, shares                 0
Unvested shares, Ending balance                 127,732
Unvested weighted average grant date fair value, beginning balance (in usd per share)                 $ 30.05
Granted, weighted average grant date fair value (in usd per share)                 36.86
Vested, weighted average grant date fair value (in usd per share)                 31.35
Forfeited, weighted average grant date fair value (in usd per share)                 0.00
Unvested weighted average grant date fair value, ending balance (in usd per share)                 $ 32.22
Performance Shares [Member] | January 2013 [Member]                  
Summary of restricted share activity                  
Unvested shares, Granted               72,118  
Performance Shares [Member] | January 2013 [Member] | Relative TSR [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Percentage of Total Award               30.00%  
Grant Date Fair Value by Component ($ in millions)               $ 700  
Volatility               31.00%  
Interest Rate               0.41%  
Dividend Yield               2.20%  
Performance Shares [Member] | January 2013 [Member] | Absolute TSR [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Percentage of Total Award               30.00%  
Grant Date Fair Value by Component ($ in millions)               $ 500  
Volatility               31.00%  
Interest Rate               0.41%  
Dividend Yield               2.20%  
Performance Shares [Member] | January 2013 [Member] | EBITDA Comparison [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Percentage of Total Award               40.00%  
Grant Date Fair Value by Component ($ in millions)               $ 700  
Volatility               31.00%  
Interest Rate               0.41%  
Dividend Yield               2.20%  
Performance Shares [Member] | December 2013 [Member]                  
Summary of restricted share activity                  
Unvested shares, Granted             252,088    
Performance Shares [Member] | December 2013 [Member] | Relative TSR [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Percentage of Total Award             50.00%    
Grant Date Fair Value by Component ($ in millions)             $ 4,700    
Volatility             29.00%    
Dividend Yield             2.40%    
Performance Shares [Member] | December 2013 [Member] | Relative TSR [Member] | Minimum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Interest Rate             0.34%    
Performance Shares [Member] | December 2013 [Member] | Relative TSR [Member] | Maximum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Interest Rate             2.25%    
Performance Shares [Member] | December 2013 [Member] | Absolute TSR [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Percentage of Total Award             50.00%    
Grant Date Fair Value by Component ($ in millions)             $ 2,900    
Volatility             29.00%    
Dividend Yield             2.40%    
Performance Shares [Member] | December 2013 [Member] | Absolute TSR [Member] | Minimum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Interest Rate             0.34%    
Performance Shares [Member] | December 2013 [Member] | Absolute TSR [Member] | Maximum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Interest Rate             2.25%    
Performance Shares [Member] | February 2014 [Member]                  
Summary of restricted share activity                  
Unvested shares, Granted           66,483      
Performance Shares [Member] | February 2014 [Member] | Relative TSR [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Percentage of Total Award           30.00%      
Grant Date Fair Value by Component ($ in millions)           $ 700      
Volatility           29.00%      
Interest Rate           0.62%      
Dividend Yield           2.40%      
Performance Shares [Member] | February 2014 [Member] | Absolute TSR [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Percentage of Total Award           30.00%      
Grant Date Fair Value by Component ($ in millions)           $ 500      
Volatility           29.00%      
Interest Rate           0.62%      
Dividend Yield           2.40%      
Performance Shares [Member] | February 2014 [Member] | EBITDA Comparison [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Percentage of Total Award           40.00%      
Grant Date Fair Value by Component ($ in millions)           $ 800      
Volatility           29.00%      
Interest Rate           0.62%      
Dividend Yield           2.40%      
Performance Shares [Member] | February 2015 [Member]                  
Summary of restricted share activity                  
Unvested shares, Granted         44,962        
Performance Shares [Member] | February 2015 [Member] | Relative TSR [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Percentage of Total Award         30.00%        
Grant Date Fair Value by Component ($ in millions)         $ 900        
Volatility         22.00%        
Interest Rate         1.02%        
Dividend Yield         2.50%        
Performance Shares [Member] | February 2015 [Member] | Absolute TSR [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Percentage of Total Award         40.00%        
Grant Date Fair Value by Component ($ in millions)         $ 700        
Volatility         22.00%        
Interest Rate         1.02%        
Dividend Yield         2.50%        
Performance Shares [Member] | February 2015 [Member] | EBITDA Comparison [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Percentage of Total Award         30.00%        
Grant Date Fair Value by Component ($ in millions)         $ 700        
Volatility         22.00%        
Interest Rate         1.02%        
Dividend Yield         2.50%        
Performance Shares [Member] | July 2015 [Member]                  
Summary of restricted share activity                  
Unvested shares, Granted       771          
Performance Shares [Member] | July 2015 [Member] | Relative TSR [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Percentage of Total Award       30.00%          
Grant Date Fair Value by Component ($ in millions) [1]       $ 0          
Volatility       22.00%          
Interest Rate       0.68%          
Dividend Yield       2.50%          
Performance Shares [Member] | July 2015 [Member] | Absolute TSR [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Percentage of Total Award       40.00%          
Grant Date Fair Value by Component ($ in millions) [1]       $ 0          
Volatility       22.00%          
Interest Rate       0.68%          
Dividend Yield       2.50%          
Performance Shares [Member] | July 2015 [Member] | EBITDA Comparison [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Percentage of Total Award       30.00%          
Grant Date Fair Value by Component ($ in millions) [1]       $ 0          
Volatility       22.00%          
Interest Rate       0.68%          
Dividend Yield       2.50%          
Performance Shares [Member] | February 2016 [Member]                  
Summary of restricted share activity                  
Unvested shares, Granted     100,919            
Performance Shares [Member] | February 2016 [Member] | Relative TSR [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Percentage of Total Award     70.00%            
Grant Date Fair Value by Component ($ in millions)     $ 1,600            
Volatility     25.00%            
Interest Rate     0.71%            
Dividend Yield     3.00%            
Performance Shares [Member] | February 2016 [Member] | Absolute TSR [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Percentage of Total Award     15.00%            
Grant Date Fair Value by Component ($ in millions)     $ 200            
Volatility     25.00%            
Interest Rate     0.71%            
Dividend Yield     3.00%            
Performance Shares [Member] | February 2016 [Member] | EBITDA Comparison [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Percentage of Total Award     15.00%            
Grant Date Fair Value by Component ($ in millions)     $ 400            
Volatility     25.00%            
Interest Rate     0.71%            
Dividend Yield     3.00%            
Performance Shares [Member] | February 2017 [Member]                  
Summary of restricted share activity                  
Unvested shares, Granted   81,939              
Performance Shares [Member] | February 2017 [Member] | Relative TSR [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Percentage of Total Award   65.00%              
Performance Shares [Member] | February 2017 [Member] | Absolute TSR [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Percentage of Total Award   35.00%              
Performance Shares [Member] | February 2017 [Member] | Relative & Absolute TSR [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Grant Date Fair Value by Component ($ in millions)   $ 2,700              
Volatility   28.00%              
Interest Rate   1.27%              
Dividend Yield   5.60%              
Performance Shares [Member] | February 2018 [Member] [Member]                  
Summary of restricted share activity                  
Unvested shares, Granted 78,918                
Performance Shares [Member] | February 2018 [Member] [Member] | Relative TSR [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Percentage of Total Award 65.00%                
Performance Shares [Member] | February 2018 [Member] [Member] | Absolute TSR [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Percentage of Total Award 35.00%                
Performance Shares [Member] | February 2018 [Member] [Member] | Relative & Absolute TSR [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Grant Date Fair Value by Component ($ in millions) $ 3,500                
Volatility 28.00%                
Interest Rate 2.37%                
Dividend Yield 4.70%                
[1] Amounts round to zero.