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Share-Based Compensation Plan (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 10, 2016
Jul. 27, 2015
Feb. 11, 2015
Feb. 04, 2014
Dec. 13, 2013
Jan. 30, 2013
Feb. 08, 2012
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restricted Stock [Member]                    
Summary of restricted share activity                    
Unvested shares, Beginning balance               124,617 129,988 147,881
Unvested shares, Granted               68,535 46,446 44,322
Vested, shares               (52,452) (50,827) (62,047)
Forfeited, shares               (4,809) (990) (168)
Unvested shares, Ending balance               135,891 124,617 129,988
Unvested weighted average grant date fair value, beginning balance (in usd per share)               $ 35.46 $ 27.17 $ 24.59
Granted, weighted average grant date fair value (in usd per share)               23.87 48.00 30.11
Vested, weighted average grant date fair value (in usd per share)               32.79 25.70 23.12
Forfeited, weighted average grant date fair value (in usd per share)               30.66 36.45 27.57
Unvested weighted average grant date fair value, ending balance (in usd per share)               $ 30.82 $ 35.46 $ 27.17
Performance Shares [Member] | February 2012 [Member]                    
Summary of restricted share activity                    
Unvested shares, Granted             72,056      
Performance Shares [Member] | February 2012 [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)             $ 0.7      
Volatility             33.00%      
Interest Rate             0.34%      
Dividend Yield             2.20%      
Performance Shares [Member] | February 2012 [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)             $ 0.6      
Volatility             33.00%      
Interest Rate             0.34%      
Dividend Yield             2.20%      
Performance Shares [Member] | February 2012 [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)             $ 0.7      
Volatility             33.00%      
Interest Rate             0.34%      
Dividend Yield             2.20%      
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)           $ 0.7        
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)           $ 0.5        
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)           $ 0.7        
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)         $ 4.7          
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)         $ 2.9          
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)       $ 0.7            
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)       $ 0.5            
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)       $ 0.8            
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)     $ 0.9              
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)     $ 0.7              
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)     $ 0.7              
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]   $ 0.0                
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]   $ 0.0                
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]   $ 0.0                
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) $ 1.6                  
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) $ 0.2                  
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) $ 0.4                  
Volatility 25.00%                  
Interest Rate 0.71%                  
Dividend Yield 3.00%                  
[1] Amounts round to zero.