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Restricted Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Feb. 05, 2016
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares distribution period from grant date     1 year  
5/12/2015 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of each share issued on grant date (in dollars per share)   $ 22.59    
Summary of stock Issuances [Abstract]        
Number of shares issued (in shares)   21,252    
Vesting date   May 12, 2016    
Service Period   7/1/2015 - 6/30/2016    
5/10/2016 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of each share issued on grant date (in dollars per share)   $ 24.89    
Summary of stock Issuances [Abstract]        
Number of shares issued (in shares)   17,677    
Vesting date   May 10, 2017    
Service Period   7/1/2016 - 6/30/2017    
Restricted Stock Units (RSUs) [Member]        
Summary of stock Issuances [Abstract]        
Period restricted stocks will vest ratably from date of grant     3 years  
Restricted Stock Units (RSUs) [Member] | Class B [Member] | Outside Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total value of shares issued     $ 440 $ 480
Restricted Stock Units (RSUs) [Member] | Class B [Member] | Executives [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total value of shares issued $ 1,103      
Shares issued (in shares) 47,333      
Value of each share issued on grant date (in dollars per share) $ 23.30