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Revenue (Textual) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales and merchandising revenues | $ 812,662 | $ 685,579 | $ 911,402 | $ 635,739 | $ 1,004,072 | $ 836,595 | $ 993,662 | $ 852,016 | $ 3,045,382 | $ 3,686,345 | $ 3,924,790
Expected duration of performance obligations |  |  |  |  |  |  |  |  | 1 year |  |
Amortization period of contract costs |  |  |  |  |  |  |  |  | 1 year |  |
ASC 606 Impact | Revenues under ASC 606 |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales and merchandising revenues |  |  |  |  |  |  |  |  | $ 701,437 |  |
Pro forma as if the previous accounting guidance was in effect |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales and merchandising revenues |  |  |  |  |  |  |  |  | 3,746,819 |  |
Pro forma as if the previous accounting guidance was in effect | Revenues under ASC 606 |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales and merchandising revenues |  |  |  |  |  |  |  |  | 688,300 |  |
Expected increase in cost of sales calculated under the previous accounting guidance |  |  |  |  |  |  |  |  | 170,400 |  |
Assets, Total | ASC 606 Impact | Revenues under ASC 606 |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impact on Balance Sheet of adoption of new accounting guidance |  |  |  |  |  |  |  |  | 22,700 |  |
Liabilities, Total | ASC 606 Impact | Revenues under ASC 606 |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impact on Balance Sheet of adoption of new accounting guidance |  |  |  |  |  |  |  |  | $ 30,500 |  |
Services | Transferred over Time |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer, percentage of service revenues |  |  |  |  |  |  |  |  | 7.00% |  |
Services | Minimum | Transferred at Point in Time |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected payment period |  |  |  |  |  |  |  |  | 0 days |  |
Services | Maximum | Transferred at Point in Time |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected payment period |  |  |  |  |  |  |  |  | 30 days |  |
Specialty nutrients | Minimum | Transferred at Point in Time |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected payment period |  |  |  |  |  |  |  |  | 0 days |  |
Specialty nutrients | Maximum | Transferred at Point in Time |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected payment period |  |  |  |  |  |  |  |  | 30 days |  |
Co-products | Minimum | Transferred at Point in Time |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected payment period |  |  |  |  |  |  |  |  | 5 days |  |
Co-products | Maximum | Transferred at Point in Time |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected payment period |  |  |  |  |  |  |  |  | 15 days |  |

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