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Pension (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Pension [Abstract] |  |  |
Expected pension expense | $ 680 |  |
Pension expense | $ 171 | $ 120 | $ 421

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