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Stock Based Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 291,978 | 358,367
Tax benefit rate | 36.00% |
Equity Compensation Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) | 750,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) | 750,000 |
Restricted Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) | 57,164 | 72,920
Unrecognized compensation cost related to nonvested shares | $ 1,073,000 |
Weighted average period related to compesation cost | 1 year 4 months 24 days |
Performance Shares [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) | 24,891 | 64,434
Unrecognized compensation cost related to nonvested shares | $ 836,000 |
Weighted average period related to compesation cost | 8 months 12 days |

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