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Employee and Non-Employee Benefit Plans (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) shares | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) plan shares | Jun. 30, 2019 USD ($) shares | Dec. 31, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of active equity-based compensation plans | plan |  |  | 2 |  |
Gain on deferred compensation plan investments | $ | $ 331 | $ 53 | $ 167 | $ 80 |
EDC plan noncurrent liabilities | $ | $ 1,938 |  | $ 1,938 |  | $ 1,337
The 2014 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares approved (in shares) | 1,500,000 |  | 1,500,000 |  |
The Directors' Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares approved (in shares) | 300,000 |  | 300,000 |  |
Short-term Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
EDC plan assets | $ | $ 1,516 |  | $ 1,516 |  | $ 1,185
Restricted Stock Units (RSUs), granted |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
RSUs outstanding (in shares) | 124,577 |  | 124,577 |  |
Participating securities (in shares) |  |  | 116,127 | 112,865 |
Restricted Stock Units (RSUs), granted | The 2014 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grants in period (in shares) |  |  | 421,220 |  |
Restricted Stock Units (RSUs), granted | The Directors' Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grants in period (in shares) |  |  | 89,840 |  |

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