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Retirement Plans (Future Benefit Payments) (Details) - Pension Plan $ in Thousands | Dec. 31, 2018 USD ($)
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United States |
Defined Benefit Plan, Expected Future Benefit Payment |
2019 | $ 940
2020 | 946
2021 | 1,004
2022 | 1,021
2023 | 1,080
Years 2024-2028 | 5,396
United Kingdom |
Defined Benefit Plan, Expected Future Benefit Payment |
2019 | 261
2020 | 276
2021 | 283
2022 | 301
2023 | 325
Years 2024-2028 | $ 2,044

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