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Stock Based Compensation (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
plan
shares
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2016
USD ($)
plan
shares
Sep. 30, 2015
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of stock based compensation plans | plan 3   3  
Shares issued upon satisfaction of required conditions of the Plans 134,809 107,133 136,139 112,553
Stock based compensation expense | $ $ 0.6 $ 0.4 $ 1.4 $ 0.9
Time-based shares | Vest equally over three years        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percent of shares in tranche     50.00%  
Award vesting period     3 years  
Time-based shares | Vesting, first anniversary        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     33.33%  
Time-based shares | Vesting, second anniversary        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     33.33%  
Time-based shares | Vesting, third anniversary        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     33.33%  
Performance-based shares | Vesting after achievement of performance targets        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percent of shares in tranche     50.00%  
Award vesting period     3 years  
Recognition and Retention Plan 2003        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized 1,250,000   1,250,000  
Restricted Stock Plan 2011        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized 500,000   500,000  
Equity Incentive Plan 2014        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized 1,750,000   1,750,000