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Transactions with Related Parties (Schedule of Receivables From and Payables To Related Parties) (Details) - ANSAC - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Related Party Transaction [Line Items] |  |
Receivables | $ 60,594 | $ 74,490
Payables | $ 815 | $ 1,223

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