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Employee Benefit Plans - Changes Recognized in OCI (Details) - Defined benefit plans - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actuarial gain/(loss) | $ (5,478) | $ (7,765) | $ 12,205
Prior service cost | 0 | (424) | 0
Amortization of actuarial loss and prior service cost | (2,622) | (3,527) | (4,424)
Settlement losses | 0 | 11,713 | 0
Total | $ (2,856) | $ 7,051 | $ 16,629

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