| **Pension and Other Post Retirement Benefit Plans - Schedule of Accumulated Benefit Obligation in Excess of Plan Assets (Details) - USD ($) $ in Thousands** | Dec. 31, 2018 | Dec. 31, 2017 |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Retirement Benefits [Abstract]**                                                                                                                           |          |          |
| Projected benefit obligation                                                                                                                                 | $ 3,481       | $ 4,604       |
| Accumulated benefit obligation                                                                                                                               | 3,481         | 4,604         |
| Fair value of plan assets                                                                                                                                    | $ 0           | $ 0           |

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| - References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.
+ References
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