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Employee Benefit Plans - Expected Benefit Payments (Details) - Post-employment benefits $ in Thousands	Dec. 31, 2018 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2019	$ 484
2020	468
2021	438
2022	426
2023	376
2024-2028	961
Total	3,153
Medicare Part D Subsidy Receipts
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2019	17
2020	15
2021	14
2022	13
2023	11
2024-2028	34
Total	$ 104

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