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Share-Based Compensation Plan (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jul. 27, 2015
Feb. 11, 2015
Feb. 04, 2014
Dec. 13, 2013
Jan. 30, 2013
Feb. 08, 2012
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Restricted Stock [Member]                  
Summary of restricted share activity                  
Unvested shares, Beginning balance             129,988 147,881 128,622
Unvested shares, Granted             46,446 44,322 84,451
Vested, shares             (50,827) (62,047) (65,192)
Forfeited, shares             (990) (168) 0
Unvested shares, Ending balance             124,617 129,988 147,881
Unvested weighted average grant date fair value, beginning balance             $ 27.17 $ 24.59 $ 22.19
Granted, weighted average grant date fair value             48.00 30.11 26.07
Vested, weighted average grant date fair value             25.70 23.12 21.96
Forfeited, weighted average grant date fair value             36.45 27.57 0.00
Unvested weighted average grant date fair value, ending balance             $ 35.46 $ 27.17 $ 24.59
February 2012 [Member] | Performance Shares [Member]                  
Summary of restricted share activity                  
Unvested shares, Granted           72,056      
February 2012 [Member] | Relative TSR [Member] | Performance Shares [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)           $ 0.7      
Volatility           33.00%      
Interest Rate           0.34%      
Dividend Yield           2.20%      
February 2012 [Member] | Absolute TSR [Member] | Performance Shares [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)           $ 0.6      
Volatility           33.00%      
Interest Rate           0.34%      
Dividend Yield           2.20%      
February 2012 [Member] | EBITDA Comparison [Member] | Performance Shares [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)           $ 0.7      
Volatility           33.00%      
Interest Rate           0.34%      
Dividend Yield           2.20%      
January 2013 [Member] | Performance Shares [Member]                  
Summary of restricted share activity                  
Unvested shares, Granted         72,118        
January 2013 [Member] | Relative TSR [Member] | Performance Shares [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)         $ 0.7        
Volatility         31.00%        
Interest Rate         0.41%        
Dividend Yield         2.20%        
January 2013 [Member] | Absolute TSR [Member] | Performance Shares [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)         $ 0.5        
Volatility         31.00%        
Interest Rate         0.41%        
Dividend Yield         2.20%        
January 2013 [Member] | EBITDA Comparison [Member] | Performance Shares [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)         $ 0.7        
Volatility         31.00%        
Interest Rate         0.41%        
Dividend Yield         2.20%        
December 2013 [Member] | Performance Shares [Member]                  
Summary of restricted share activity                  
Unvested shares, Granted       252,088          
December 2013 [Member] | Relative TSR [Member] | Performance Shares [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)       $ 4.7          
Volatility       29.00%          
Dividend Yield       2.40%          
December 2013 [Member] | Absolute TSR [Member] | Performance Shares [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)       $ 2.9          
Volatility       29.00%          
Dividend Yield       2.40%          
February 2014 [Member] | Performance Shares [Member]                  
Summary of restricted share activity                  
Unvested shares, Granted     66,483            
February 2014 [Member] | Relative TSR [Member] | Performance Shares [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)     $ 0.7            
Volatility     29.00%            
Interest Rate     0.62%            
Dividend Yield     2.40%            
February 2014 [Member] | Absolute TSR [Member] | Performance Shares [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)     $ 0.5            
Volatility     29.00%            
Interest Rate     0.62%            
Dividend Yield     2.40%            
February 2014 [Member] | EBITDA Comparison [Member] | Performance Shares [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)     $ 0.8            
Volatility     29.00%            
Interest Rate     0.62%            
Dividend Yield     2.40%            
February 2015 [Member] | Performance Shares [Member]                  
Summary of restricted share activity                  
Unvested shares, Granted   44,962              
February 2015 [Member] | Relative TSR [Member] | Performance Shares [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)   $ 0.9              
Volatility   22.00%              
Interest Rate   1.02%              
Dividend Yield   2.50%              
February 2015 [Member] | Absolute TSR [Member] | Performance Shares [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)   $ 0.7              
Volatility   22.00%              
Interest Rate   1.02%              
Dividend Yield   2.50%              
February 2015 [Member] | EBITDA Comparison [Member] | Performance Shares [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)   $ 0.7              
Volatility   22.00%              
Interest Rate   1.02%              
Dividend Yield   2.50%              
July 2015 [Member] | Performance Shares [Member]                  
Summary of restricted share activity                  
Unvested shares, Granted 771                
July 2015 [Member] | Relative TSR [Member] | Performance Shares [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] $ 0.0                
Volatility 22.00%                
Interest Rate 0.68%                
Dividend Yield 2.50%                
July 2015 [Member] | Absolute TSR [Member] | Performance Shares [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] $ 0.0                
Volatility 22.00%                
Interest Rate 0.68%                
Dividend Yield 2.50%                
July 2015 [Member] | EBITDA Comparison [Member] | Performance Shares [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] $ 0.0                
Volatility 22.00%                
Interest Rate 0.68%                
Dividend Yield 2.50%                
Minimum [Member] | December 2013 [Member] | Relative TSR [Member] | Performance Shares [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Interest Rate       0.34%          
Minimum [Member] | December 2013 [Member] | Absolute TSR [Member] | Performance Shares [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Interest Rate       0.34%          
Maximum [Member] | December 2013 [Member] | Relative TSR [Member] | Performance Shares [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Interest Rate       2.25%          
Maximum [Member] | December 2013 [Member] | Absolute TSR [Member] | Performance Shares [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                  
Interest Rate       2.25%          
[1] Amounts round to zero.