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Stock Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
May 17, 2018
May 18, 2017
May 24, 2016
Jan. 03, 2014
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
May 17, 2018
May 18, 2017
May 24, 2016
Jan. 03, 2014
Stock Awards                      
Rollforward of deferred stock award activity                      
Unvested and Potential Stock Awards as of the beginning of the year (in shares)         868,437            
Unvested and Potential Stock Awards as of end of the year (in shares)         1,227,483 868,437          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Unvested and Potential Stock Awards, Weighted-Average Grant Date Fair Value at beginning of year (in dollars per share)         $ 21.69            
Unvested and Potential Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)         23.14 $ 21.69          
Grant Date Fair Value (in dollars per share)         $ 21.69 $ 21.69          
Unvested Shares (in shares)         868,437 868,437          
Deferred Stock Award                      
Rollforward of deferred stock award activity                      
Deferred Stock Awards Granted (in shares)         354,236            
Deferred Stock Awards Vested (in shares)         (332,019)            
Deferred Stock Awards Forfeited (in shares)         (8,959)            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Deferred Stock Awards Granted, Weighted-Average Grant Date Fair (in dollars per share)         $ 17.84 $ 21.38 $ 19.96        
Deferred Stock Awards Vested, Weighted-Average Grant Date Fair Value (in dollars per share)         19.21            
Deferred Stock Awards Forfeited, Weighted Average Grant Date Fair Value (in dollars per share)         $ 19.77            
Total Grant Date Fair Value of Deferred Stock Vested During the Period         $ 6,378 $ 5,899 $ 4,806        
Performance Shares                      
Rollforward of deferred stock award activity                      
Increase in Estimated Potential Future Performance Share Awards, net of forfeitures (in shares)         506,793            
Deferred Stock Awards Vested (in shares)         (161,005)            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Increase in Estimated Potential Future Performance Share Awards, Weighted Average Grant Date Fair Value (in dollars per share)         $ 25.20            
Deferred Stock Awards Vested, Weighted-Average Grant Date Fair Value (in dollars per share)         $ 18.47            
Share-based Liability Awards Paid During the Period         $ 2,947 $ 2,877 $ 1,127        
Deferred Stock Award, Granted January 3, 2014 | Deferred Stock Award                      
Rollforward of deferred stock award activity                      
Unvested and Potential Stock Awards as of end of the year (in shares)         16,416            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Unvested and Potential Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)       $ 16.45              
Net Shares Granted (in shares)                     72,969
Grant Date Fair Value (in dollars per share)       $ 16.45             $ 16.45
Unvested Shares (in shares)         16,416            
Deferred Stock Award, Granted January 3, 2014 | Share-based Compensation Award, Tranche One | Deferred Stock Award                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Vesting percentage       20.00%              
Deferred Stock Award, Granted January 3, 2014 | Share-based Compensation Award, Tranche Two | Deferred Stock Award                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Vesting percentage       20.00%              
Deferred Stock Award, Granted January 3, 2014 | Share-based Compensation Award, Tranche Three | Deferred Stock Award                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Vesting percentage       20.00%              
Deferred Stock Award, Granted January 3, 2014 | Share-based Compensation Award, Tranche Four | Deferred Stock Award                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Vesting percentage       20.00%              
Deferred Stock Award, Granted January 3, 2014 | Share-based Compensation Award, Tranche Five | Deferred Stock Award                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Vesting percentage       20.00%              
Deferred Stock Award, Granted May 24, 2016 | Deferred Stock Award                      
Rollforward of deferred stock award activity                      
Unvested and Potential Stock Awards as of end of the year (in shares)         60,487            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Unvested and Potential Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)     $ 19.91                
Net Shares Granted (in shares)                   208,003  
Grant Date Fair Value (in dollars per share)     $ 19.91             $ 19.91  
Unvested Shares (in shares)         60,487            
Deferred Stock Award, Granted May 24, 2016 | Share-based Compensation Award, Tranche One | Deferred Stock Award                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Vesting percentage     25.00%                
Deferred Stock Award, Granted May 24, 2016 | Share-based Compensation Award, Tranche Two | Deferred Stock Award                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Vesting percentage     25.00%                
Deferred Stock Award, Granted May 24, 2016 | Share-based Compensation Award, Tranche Three | Deferred Stock Award                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Vesting percentage     25.00%                
Deferred Stock Award, Granted May 24, 2016 | Share-based Compensation Award, Tranche Four | Deferred Stock Award                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Vesting percentage     25.00%                
Performance Share Program Award, Granted May 24, 2016 | Performance Shares                      
Rollforward of deferred stock award activity                      
Unvested and Potential Stock Awards as of end of the year (in shares)         139,127            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Unvested and Potential Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)     $ 23.02                
Net Shares Granted (in shares)                   0  
Grant Date Fair Value (in dollars per share)     $ 23.02             $ 23.02  
Unvested Shares (in shares)         139,127            
Deferred Stock Award, Granted May 18, 2017 | Deferred Stock Award                      
Rollforward of deferred stock award activity                      
Unvested and Potential Stock Awards as of end of the year (in shares)         123,343            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Unvested and Potential Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)   $ 21.38                  
Net Shares Granted (in shares)                 219,863    
Grant Date Fair Value (in dollars per share)   $ 21.38             $ 21.38    
Unvested Shares (in shares)         123,343            
Deferred Stock Award, Granted May 18, 2017 | Share-based Compensation Award, Tranche One | Deferred Stock Award                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Vesting percentage   25.00%                  
Deferred Stock Award, Granted May 18, 2017 | Share-based Compensation Award, Tranche Two | Deferred Stock Award                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Vesting percentage   25.00%                  
Deferred Stock Award, Granted May 18, 2017 | Share-based Compensation Award, Tranche Three | Deferred Stock Award                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Vesting percentage   25.00%                  
Deferred Stock Award, Granted May 18, 2017 | Share-based Compensation Award, Tranche Four | Deferred Stock Award                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Vesting percentage   25.00%                  
Performance Share Program Award, Granted May 18, 2017 | Performance Shares                      
Rollforward of deferred stock award activity                      
Unvested and Potential Stock Awards as of end of the year (in shares)         251,123            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Unvested and Potential Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)   $ 30.45                  
Net Shares Granted (in shares)                 0    
Grant Date Fair Value (in dollars per share)   $ 30.45             $ 30.45    
Unvested Shares (in shares)         251,123            
Deferred Stock Award, Granted May 17, 2018 Deferred Stock Award Independent Directors | Deferred Stock Award | Independent directors                      
Rollforward of deferred stock award activity                      
Unvested and Potential Stock Awards as of end of the year (in shares)         31,388            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Unvested and Potential Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share) $ 17.84                    
Net Shares Granted (in shares)               31,388      
Grant Date Fair Value (in dollars per share) $ 17.84             $ 17.84      
Unvested Shares (in shares)         31,388            
Deferred Stock Award, Granted May 17, 2018 Deferred Stock Award Independent Directors | Share-based Compensation Award, Tranche One | Deferred Stock Award | Independent directors                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Vesting percentage 100.00%                    
Deferred Stock Award, Granted May 17, 2018 | Deferred Stock Award                      
Rollforward of deferred stock award activity                      
Unvested and Potential Stock Awards as of end of the year (in shares)         239,567            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Unvested and Potential Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share) $ 17.84                    
Net Shares Granted (in shares)               302,706      
Grant Date Fair Value (in dollars per share) $ 17.84             $ 17.84      
Unvested Shares (in shares)         239,567            
Deferred Stock Award, Granted May 17, 2018 | Share-based Compensation Award, Tranche One | Deferred Stock Award                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Vesting percentage 25.00%                    
Deferred Stock Award, Granted May 17, 2018 | Share-based Compensation Award, Tranche Two | Deferred Stock Award                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Vesting percentage 25.00%                    
Deferred Stock Award, Granted May 17, 2018 | Share-based Compensation Award, Tranche Three | Deferred Stock Award                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Vesting percentage 25.00%                    
Deferred Stock Award, Granted May 17, 2018 | Share-based Compensation Award, Tranche Four | Deferred Stock Award                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Vesting percentage 25.00%                    
Performance Share Program Award, Granted May 17, 2018 | Performance Shares                      
Rollforward of deferred stock award activity                      
Unvested and Potential Stock Awards as of end of the year (in shares)         366,032            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Unvested and Potential Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share) $ 23.52                    
Net Shares Granted (in shares)               0      
Grant Date Fair Value (in dollars per share) $ 23.52             $ 23.52      
Unvested Shares (in shares)         366,032