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Share-Based Compensation Plan (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Feb. 15, 2017
Feb. 10, 2016
Jul. 27, 2015
Feb. 11, 2015
Feb. 04, 2014
Dec. 13, 2013
Jan. 30, 2013
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restricted Stock [Member]                    
Summary of restricted share activity                    
Unvested shares, Beginning balance               135,891 124,617 129,988
Unvested shares, Granted               59,139 68,535 46,446
Vested, shares               (57,559) (52,452) (50,827)
Forfeited, shares               (366) (4,809) (990)
Unvested shares, Ending balance               137,105 135,891 124,617
Unvested weighted average grant date fair value, beginning balance (in usd per share)               $ 30.82 $ 35.46 $ 27.17
Granted, weighted average grant date fair value (in usd per share)               29.68 23.87 48.00
Vested, weighted average grant date fair value (in usd per share)               31.50 32.79 25.70
Forfeited, weighted average grant date fair value (in usd per share)               28.01 30.66 36.45
Unvested weighted average grant date fair value, ending balance (in usd per share)               $ 30.05 $ 30.82 $ 35.46
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%                  
Volatility 28.00%                  
Interest Rate 1.27%                  
Dividend Yield 5.60%                  
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%                  
Volatility 28.00%                  
Interest Rate 1.27%                  
Dividend Yield 5.60%                  
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                  
[1] Amounts round to zero.