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Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options granted | 0 |  |
Options outstanding | 1,276,411 | 1,314,435 |
Options exercised | 24,274 |  |
Cash consideration from exercise of stock options | $ 32 | $ 97 | $ 89
2005 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized | 2,000,000 |  |
2005 Plan [Member] | One-Year [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 1 year |  |
2005 Plan [Member] | Three-Year [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
2016 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized | 3,500,000 |  |
Percentage of legal entity controlled by optionee | 100.00% |  |
Maximum [Member] | 2005 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercise period of options | 10 years |  |
Vesting period | 4 years |  |
Maximum [Member] | 2016 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercise period of options | 10 years |  |
Minimum [Member] | 2005 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 6 months |  |
Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Target PSU's, Granted | 167,968 |  |
Vesting period | 3 years |  |
Market Conditions | 25.00% |  |
Performance Conditions | 75.00% |  |
Unrecognized compensation expense related to unvested stock options | $ 900 |  |
Expected period of recognition for unrecognized compensation cost | 2 years |  |
Fair value per share of restricted common stock | $ 8.03 |  |
Shares vested during the period | 0 |  |
Performance Shares [Member] | 2016 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Target PSU's, Granted | 167,968 |  |
Performance Shares [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Target Grant | 200.00% |  |
Performance Shares [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Target Grant | 0.00% |  |
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options granted | 0 | 0 | 0
Options outstanding | 1,276,411 | 1,314,435 |
Total fair value of shares vested | $ 900 | $ 1,100 | $ 900
Closing stock price per share | $ 9.13 |  |
Options exercised | 24,274 |  |
Intrinsic value of options exercised | $ 100 |  |
Vested | 331,250 | 335,000 | 341,250
Tax benefits from option exercises | $ 100 |  |
Director [Member] | Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options outstanding | 72,950 |  |
Weighted average exercise price per share of options outstanding | $ 5.09 |  |
Vested | 18,750 |  |

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