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Stock Based Compensation - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Non-vested shares   319,058 280,457 319,058 280,457 280,457 162,171
Shares granted       160,453 185,650    
Performance Share Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period 3 years            
2010 Stock Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Maximum number of shares that may be issued   1,190,000   1,190,000      
Shares available for grant   331,077   331,077   551,609  
2010 Stock Incentive Plan | Director              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares issued, aggregate   207,014   207,014   146,935  
2010 Stock Incentive Plan | Employee Stock Option              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares issued, aggregate   562,280   562,280   401,827  
2010 Stock Incentive Plan | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Non-vested shares   319,058   319,058   280,457  
Share-based compensation expense   $ 200,000 $ 200,000 $ 500,000 $ 400,000    
Forfeitures (in shares)       0 0    
Unrecognized compensation cost   1,700,000 $ 1,600,000 $ 1,700,000 $ 1,600,000    
Unrecognized compensation cost, period for recognition       2 years 45 days      
Fair value of vested shares       $ 600,000 $ 500,000    
Requisite service period       3 years      
2010 Stock Incentive Plan | Performance Share Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation expense   31,700   $ 63,400      
Unrecognized compensation cost   $ 200,000   $ 200,000      
2010 Stock Incentive Plan | Performance Share Awards | Board of Directors Chairman              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted 89,629            
Fair value of shares granted $ 400,000            
Percentage of target PSA's granted eligible for receipt, minimum 0.00%            
Percentage of target PSA's granted eligible for receipt, maximum 200.00%            
Award vesting period 3 years            
Fair value, expected term 3 years            
Fair value, expected term for volatility rate 3 years            
Fair value, expected term for risk free interest rate 3 years            
Fair value, expected term for dividend rate 3 years            
2010 Stock Incentive Plan | Performance Share Awards | Board of Directors Chairman | If TSR is Less Than 33%              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting rights, percentage 0.00%            
2010 Stock Incentive Plan | Performance Share Awards | Board of Directors Chairman | If TSR is Greater Than or Equal to 33%              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting rights, percentage 100.00%            
2010 Stock Incentive Plan | Performance Share Awards | Board of Directors Chairman | If TSR is Greater Than or Equal to 33% and TSR Is InTop Quartile of Identified Peer Group              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting rights, percentage 200.00%            
2010 Stock Incentive Plan | Performance Share Awards | Board of Directors Chairman | If TSR Is Greater Than or Equal to 33% and TSR Is InBottom Quartile of Identified Peer Group              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting rights, percentage 50.00%