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Related Party Transactions (Summary of Related Party Outstanding Balances) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Related Party Transaction [Line Items] |  |
Miscellaneous | $ 98,291 | $ 89,661
Axionlog Distribution B.V. [Member] |  |
Related Party Transaction [Line Items] |  |
Accounts and notes receivable | 1,097 | 0
Other receivables | 979 | 1,050
Miscellaneous | 3,126 | 3,612
Accounts payable | $ (11,727) | $ (10,355)

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