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Employee Benefit Plans (Other Changes in Plan Assets and Benefit Obligations) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Retirement Benefits [Abstract] |  |
Current year actuarial loss | $ (3,574) | $ (1,812)
Amortization of actuarial loss | 2,689 | 2,835
Total recognized in other comprehensive loss | (885) | $ 1,023
Estimated portion of net actuarial loss in accumulated other comprehensive loss | $ 2,900 |

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