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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Other selling and administrative expenses | $ 360,000 | $ 353,296 | $ 784,617 | $ 684,125
Other non-operating expense, net | 3,063 | 5,128 | 2,455 | 5,622
Cash contributions made during the period |  |  | 17,000 |
Expected additional cash contributions | $ 4,000 |  | $ 4,000 |
Accounting Standards Update 2017-07 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Other selling and administrative expenses |  | 300 |  | (1,100)
Other non-operating expense, net |  | $ (300) |  | $ 1,100

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