Derivative Instruments (Details Textual) lb in Millions, gal in Millions, BTU in Millions	6 Months Ended
	Jun. 30, 2019 BTU lb gal
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Heating oil covered under the open commodity derivative contracts (in gallons) | gal	50
Soybean oil covered under the open commodity derivative contracts (in pounds) | lb	3
Natural gas covered under the open commodity derivative contracts (in BTUs) | BTU	2