Inventories (Schedule Of Major Components Of Inventories) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2016
Inventory Disclosure [Abstract]
Petroleum products	$ 14,235,000	$ 11,550,000
Crude oil	22,815,000	73,133,000
Caustic soda	3,964,000	4,593,000
NaHS	2,755,000	9,304,000
Other	6,000	7,000
Total	43,775,000	98,587,000
Inventory write-down	$ 900,000	$ 0