SEGMENT INFORMATION AND GEOGRAPHICAL DATA (Details 2) - USD ($)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Geographical data
Sales	[1]	$ 711,639,000	$ 1,111,254,000	$ 873,255,000
Outside the United States
Geographical data
Long-term assets		0
CANADA
Geographical data
Sales		$ 39,100,000	$ 30,800,000	$ 13,600,000

[1] Fuel revenues and cost of goods sold include excise taxes and similar taxes $50,939 $50,116 $47,007.