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