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Employee Benefit Plans - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) participant | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Cost recognized | $ 1,488 | $ 1,299 | $ 1,097
Effect of one percentage point increase in assumed health care costs, affect on accumulated benefit obligation | 69 |  |
Effect of one percentage point decrease in assumed health care costs, effect on accumulated benefit obligation | (104) |  |
Effect of one percentage point increase in assumed health care costs, affect on service and interest cost | 4 |  |
Effect of one percentage point decrease in assumed health care costs, affect on service and interest cost | $ (3) |  |
Post-employment benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Number of participants | participant | 181 |  |
Number of active participants eligible for benefits | participant | 25 |  |
Minimum age of participant to become eligible for benefits | 62 years |  |
Requisite service period | 5 years |  |
Age up to which health benefits continuation paid | 65 years |  |
Expected contributions in next fiscal year, before Medicare Part D subsidy receipts | $ 484 |  |
Medicare Part D subsidy receipts to the plan in next fiscal year | 484 |  |
Expected contributions in next fiscal year, net of Medicare Part D subsidy receipts | 467 |  |
Post-employment benefits | Medicare Part D Subsidy Receipts |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Medicare Part D subsidy receipts to the plan in next fiscal year | $ 17 |  |

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