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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation | $ (415) | $ 916 | $ 274 | $ 1,751
Unearned compensation | 1,728 |  | 1,728 |
Performance Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unearned compensation related to options | 243 |  | $ 243 |
Remaining service period |  |  | 7 months |
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Remaining requisite service period |  |  | 25 months |
Time-Vested Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unearned compensation related to options | $ 797 |  | $ 797 |
Remaining service period |  |  | 28 months |

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