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Pension and Other Post Retirement Benefit Plans - Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Retirement Benefits [Abstract] |  |  |
Net periodic pension benefit cost | $ (1,693) | $ 654 | $ 509
Amortization of net loss | (2,189) | 1,504 | (228)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Amortization Cost (Credit), before Tax | 287 | 1,979 | 1,656
Amortization of prior service cost | 87 | 90 | 79
Total recognized in other comprehensive income (loss) | (1,815) | 3,573 | 1,507
Total recognized in net periodic pension benefit cost and other comprehensive income (loss) | $ (122) | $ 2,919 | $ 998

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