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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Other selling and administrative expenses | $ 325,874 | $ 381,214 | $ 1,110,491 | $ 1,065,339
Other non-operating expense, net | 1,911 | 1,910 | 4,366 | 7,532
Cash contributions made during the period |  |  | 17,000 |
Expected additional cash contributions | $ 3,000 |  | $ 3,000 |
Accounting Standards Update 2017-07 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Other selling and administrative expenses |  | (500) |  | (1,600)
Other non-operating expense, net |  | $ 500 |  | $ 1,600

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