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Share-Based Compensation Plan (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Feb. 11, 2015
Feb. 04, 2014
Dec. 13, 2013
Jan. 30, 2013
Feb. 08, 2012
Jun. 30, 2015
Restricted Stock [Member]            
Summary of restricted share activity            
Unvested shares, Beginning balance           129,988
Unvested shares, Granted           40,507
Vested, shares           (50,827)
Forfeited, shares           (990)
Unvested shares, Ending balance           118,678
Unvested weighted average grant date fair value, beginning balance           $ 27.17
Granted, weighted average grant date fair value           48.87
Vested, weighted average grant date fair value           25.70
Forfeited, weighted average grant date fair value           36.45
Unvested weighted average grant date fair value, ending balance           $ 35.13
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%          
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%