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Related Party Transactions - AgFirst Farm Credit Bank (Details) - AgFirst Farm Credit Bank [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |  |
Revenue from Related Parties | $ 1,200,000 | $ 1,100,000 | $ 1,100,000
Accounts Receivable, Related Parties, Current | 102,828 | 103,272 |
Related Party Transaction, Other Revenues from Transactions with Related Party | $ 0 | 0 | 0
Common Class B [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Common Stock Ownership Percentage by a Related Party | 16.80% |  |
Guarantee Obligations [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | $ 26,600,000 | 40,000,000 | $ 36,400,000
Related Party Transactions, Outstanding Balance | 340,500,000 | 353,800,000 |
Performance Guarantee [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transactions, Outstanding Balance | $ 8,600,000 | $ 11,500,000 |

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