OPERATING SEGMENTS (Details) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2017 USD ($) States Terminalling_And_Storage_Facilities		Jun. 30, 2016 USD ($)		Jun. 30, 2017 USD ($) Operating-segments States Terminalling_And_Storage_Facilities	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments (in operating segments) | Operating-segments					4
Service revenue
Third party revenue	$ 28,145		$ 30,854		$ 56,808	$ 61,110
Related party revenue	13,505		5,862		27,147	12,871
Product sales revenue:
Third party revenue	2,227		6,709		6,262	10,454
Total revenue for reportable segments	43,877		43,425		90,217	84,435
Cost of product sales	1,669		4,089		4,808	7,276
Operating margin (excluding depreciation and amortization)	19,437	[1]	19,734	[1]	38,798	36,932
Total assets (end of period)	346,096				346,096		$ 375,663
Reconciles segment operating margin (excluding depreciation and amortization) to income before income taxes
Operating margin (excluding depreciation and amortization)	19,437	[1]	19,734	[1]	38,798	36,932
Depreciation and amortization	(7,839)		(7,688)		(15,905)	(14,823)
General and administrative expenses	(4,322)		(4,834)		(8,907)	(9,579)
Asset impairment expense	(17)		(22,574)		(45)	(22,845)
Gain (loss) on sale of assets	(754)		14		(879)	(19)
Equity earnings in unconsolidated affiliate	0		157		61	781
Gain on sale of unconsolidated affiliate	4,172		0		4,172	0
Interest expense	(4,265)		(3,697)		(7,295)	(8,567)
Income (loss) before income taxes	$ 6,412		(18,888)		$ 10,000	(18,120)
Asphalt Services [Member]
Segment Reporting Information [Line Items]
Number of terminalling and storage facilities | Terminalling_And_Storage_Facilities	54				54
Number of states where Asphalt terminalling and storage facilities are located | States	26				26
Service revenue
Third party revenue	$ 13,259		18,132		$ 26,482	35,438
Related party revenue	13,505		256		26,837	558
Product sales revenue:
Total revenue for reportable segments	26,764		18,388		53,319	35,996
Operating expenses (excluding depreciation and amortization)	11,935		6,839		24,255	13,271
Operating margin (excluding depreciation and amortization)	14,829		11,549		29,064	22,725
Total assets (end of period)	147,832		117,096		147,832	117,096
Reconciles segment operating margin (excluding depreciation and amortization) to income before income taxes
Operating margin (excluding depreciation and amortization)	14,829		11,549		29,064	22,725
Crude Oil Terminalling and Storage Services [Member]
Service revenue
Third party revenue	5,726		3,626		11,851	7,187
Related party revenue	0		2,645		0	5,404
Product sales revenue:
Total revenue for reportable segments	5,726		6,271		11,851	12,591
Operating expenses (excluding depreciation and amortization)	992		1,134		2,003	2,295
Operating margin (excluding depreciation and amortization)	4,734		5,137		9,848	10,296
Total assets (end of period)	69,834		74,072		69,834	74,072
Reconciles segment operating margin (excluding depreciation and amortization) to income before income taxes
Operating margin (excluding depreciation and amortization)	4,734		5,137		9,848	10,296
Crude Oil Pipeline Services [Member]
Service revenue
Third party revenue	2,720		2,702		5,324	4,954
Related party revenue	0		985		310	3,305
Product sales revenue:
Third party revenue	2,227		6,709		5,877	10,454
Total revenue for reportable segments	4,947		10,396		11,511	18,713
Operating expenses (excluding depreciation and amortization)	3,142		3,711		6,383	7,939
Inter-segment Operating Expenses	74		235		244	495
Cost of product sales	1,669		4,089		4,808	7,276
Inter-Segment Cost of Purchased Oil and Gas	0		426		0	426
Operating margin (excluding depreciation and amortization)	62		1,935		76	2,577
Total assets (end of period)	117,222		153,706		117,222	153,706
Reconciles segment operating margin (excluding depreciation and amortization) to income before income taxes
Operating margin (excluding depreciation and amortization)	62		1,935		76	2,577
Crude Oil Trucking and Producer Field Services [Member]
Service revenue
Third party revenue	6,440		6,394		13,151	13,531
Related party revenue	0		1,976		0	3,604
Intersegment Revenues	74		235		244	495
Product sales revenue:
Third party revenue	0		0		385	0
Intersegment revenue	0		426		0	426
Total revenue for reportable segments	6,514		9,031		13,780	18,056
Operating expenses (excluding depreciation and amortization)	6,702		7,918		13,970	16,722
Operating margin (excluding depreciation and amortization)	(188)		1,113		(190)	1,334
Total assets (end of period)	11,208		13,503		11,208	13,503
Reconciles segment operating margin (excluding depreciation and amortization) to income before income taxes
Operating margin (excluding depreciation and amortization)	(188)		1,113		(190)	1,334
Operating Segments [Member]
Product sales revenue:
Total revenue for reportable segments	43,951		44,086		90,461	85,356
Intersegment Eliminations [Member]
Service revenue
Intersegment Revenues	$ (74)		$ (661)		$ (244)	$ (921)

[1] The following table reconciles segment operating margin (excluding depreciation and amortization) to income (loss) before income taxes (in thousands): Three Months ended June 30, Six Months ended June 30, 2016 2017 2016 2017Operating margin (excluding depreciation and amortization)$19,734 $19,437 $36,932 $38,798Depreciation and amortization(7,688) (7,839) (14,823) (15,905)General and administrative expenses(4,834) (4,322) (9,579) (8,907)Asset impairment expense(22,574) (17) (22,845) (45)Gain (loss) on sale of assets14 (754) (19) (879)Equity earnings in unconsolidated affiliate157 — 781 61Gain on sale of unconsolidated affiliate— 4,172 — 4,172Interest expense(3,697) (4,265) (8,567) (7,295)Income (loss) before income taxes$(18,888) $6,412 $(18,120) $10,000