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Equity Incentive Plan - Restricted Share Awards Granted and Vested (Details) - shares
9 Months Ended 28 Months Ended 32 Months Ended 44 Months Ended
Jan. 01, 2017
Jun. 01, 2015
Jan. 30, 2015
Jan. 31, 2014
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2017
Awarded January 31, 2014 | Time-based Restricted Stock Awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total Shares Granted (in shares)       48,213        
Vested (in shares)               48,213
Awarded January 31, 2014 | Performance-based Restricted Stock Awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total Shares Granted (in shares)       38,805        
Vested (in shares)               12,935
Awards January 30, 2015 | Time-based Restricted Stock Awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total Shares Granted (in shares)     40,161          
Vested (in shares)             26,774  
Awards January 30, 2015 | Performance-based Restricted Stock Awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total Shares Granted (in shares)     36,144          
Vested (in shares)             0  
Awards June 1, 2015 | Time-based Restricted Stock Awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total Shares Granted (in shares)   8,949            
Vested (in shares)           5,966    
Awards January 11, 2007 | Restricted Board Awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total Shares Granted (in shares) 5,000              
Vested (in shares)         0