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Transactions with Related Parties (Schedule of Receivables From and Payables To Related Parties) (Details) - Affiliated Entity - ANSAC - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Related Party Transaction [Line Items] |  |
Receivables | $ 68,075 | $ 60,594
Payables | $ 2,103 | $ 815

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