Revenue (Textual) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Sales and merchandising revenues	$ 685,579	$ 836,595	$ 2,232,720	$ 2,682,273
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	173,183		$ 522,648
Pro forma as if the previous accounting guidance was in effect
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Sales and merchandising revenues	858,762		2,755,368
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	170,400		515,400
Expected increase in cost of sales calculated under the previous accounting guidance	$ 170,400		515,400
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			23,400
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			$ 31,900
Service | Minimum | Transferred at Point in Time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Expected payment period			0 days
Service | 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