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Stock Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity compensation units, granted in period (in shares)       1,648  
Restricted Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity compensation units, granted in period (in shares)   14,860      
Vesting period of restricted stock unit award       4 years  
Restricted Units | Long Term Incentive Plans          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity compensation expense $ 166   $ 163 $ 950 $ 756
Restricted Units | Director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity compensation units, granted in period (in shares)   3,820